As filed with the Securities and Exchange Commission on April 24, 2018

Registration No. 333-224144

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Amendment No. 1

to

Form S-4

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

Kemper Corporation

(Exact name of registrant as specified in its charter)

One East Wacker Drive, Chicago, Illinois 60601

(312) 661-4600

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

C. Thomas Evans, Jr.

Senior Vice President, Secretary and General Counsel

Kemper Corporation

One East Wacker Drive

Chicago, Illinois 60601

(312) 661-4600

(Name, address, including zip code, and telephone number, including area code, of agent for service)

with copies to:

Approximate date of commencement of proposed sale of the securities to the public: As soon as reasonably practicable after the effectiveness of this Registration Statement and the completion of the merger described in the enclosed joint proxy statement/prospectus.

If the securities being registered on this Form are being offered in connection with the formation of a holding company and there is compliance with General Instruction G, check the following box. ☐

If this form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.  ☐

If applicable, place an X in the box to designate the appropriate rule provision relied upon in conducting this transaction:

Exchange Act Rule 13e-4(i) (Cross-Border Issuer Tender Offer)  ☐

Exchange Act Rule 14d-1(d) (Cross-Border Third-Party Tender Offer)  ☐

The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until this registration statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

Information contained in this joint proxy statement/prospectus is subject to completion or amendment. A registration statement relating to these securities has been filed with the Securities and Exchange Commission. These securities may not be offered or sold nor may offers to buy be accepted prior to the time the registration statement becomes effective. This document shall not constitute an offer to sell or the solicitation of any offer to buy nor shall there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction.

PRELIMINARY—SUBJECT TO COMPLETION— DATED APRIL 24, 2018

MERGER PROPOSED—YOUR VOTE IS VERY IMPORTANT

Dear Stockholders:

Kemper Corporation (“Kemper”) and Infinity Property and Casualty Corporation (“Infinity”) have entered into an Agreement and Plan of Merger, dated as of February 13, 2018 (as amended from time to time, the “Merger Agreement”), providing, among other things, that, upon the terms and subject to the conditions set forth in the Merger Agreement, a wholly owned subsidiary of Kemper will merge with and into Infinity, with Infinity surviving the Merger as a wholly owned subsidiary of Kemper (the “Merger”).

If the Merger is completed, each share of Infinity common stock, no par value per share (“Infinity common stock”), outstanding as of immediately prior to the effective time of the Merger (other than shares owned by Kemper or any of its wholly owned subsidiaries or Infinity or any of its subsidiaries and shares held by any holder of Infinity common stock who is entitled to demand and properly demands appraisal of such shares under Ohio law) will be cancelled and extinguished and automatically converted into, at the election of the holder of such share, subject to proration and adjustment as described in the Merger Agreement, either (i) mixed consideration consisting of $51.60 in cash, without interest and subject to any required withholding of taxes, and 1.2019 shares of Kemper common stock, par value $0.01 per share (“Kemper common stock”), (ii) cash consideration consisting of $129.00, without interest and subject to any required withholding of taxes or (iii) stock consideration consisting of 2.0031 shares of Kemper common stock. Holders of Infinity common stock who do not make an election will receive the mixed consideration described in (i) above.

Based on the number of shares of Infinity common stock outstanding on April 20, 2018, the record date for the special meeting of Infinity shareholders (the “Infinity special meeting”), Kemper expects to issue or reserve for issuance approximately 13.2 million shares of Kemper common stock pursuant to the Merger Agreement (including shares of Kemper common stock issuable to Infinity shareholders and shares of Kemper common stock issuable pursuant to the vesting and/or conversion of Infinity’s equity-based incentive awards). Based on this number and the number of shares of Kemper common stock outstanding on April 16, 2018, the record date for the annual meeting of Kemper stockholders (the “Kemper annual meeting”), upon the closing, pre-existing Kemper stockholders and former Infinity shareholders would own approximately 80% and 20% of the outstanding shares of Kemper common stock, respectively.

Kemper common stock is traded on the New York Stock Exchange (“NYSE”) under the trading symbol “KMPR.” On [●], 2018, Kemper common stock closed at $[●] per share as reported by the NYSE.

Infinity common stock is traded on the NASDAQ Stock Market (“NASDAQ”) under the trading symbol “IPCC.” On [●], 2018, Infinity common stock closed at $[●] per share as reported by the NASDAQ.

The closing is subject to certain conditions, including Kemper stockholders approving a proposal to approve the issuance of shares of Kemper common stock to Infinity shareholders in the Merger (the “share issuance proposal”) and Infinity shareholders approving a proposal to adopt the Merger Agreement (the “merger proposal”). Approval of the share issuance proposal by Kemper stockholders requires the affirmative vote of a majority of votes cast at the Kemper annual meeting with respect to the share issuance proposal, provided that a quorum is present. Approval of the merger proposal by Infinity shareholders requires the affirmative vote of shareholders entitled to exercise a majority of the voting power of Infinity.

At the Kemper annual meeting, Kemper stockholders will be asked to vote on (i) the share issuance proposal, (ii) a proposal to adjourn the Kemper annual meeting, for a period no longer than twenty (20) business days in the aggregate, for the absence of a quorum or to allow reasonable additional time to solicit proxies in favor of the share issuance proposal if there are insufficient votes at the time of the Kemper annual meeting or any adjournment or postponement thereof (the “Kemper meeting adjournment proposal”), (iii) a proposal to elect the director nominees named in this joint proxy statement/prospectus,

(iv) a non-binding advisory proposal to ratify the selection of Deloitte & Touche LLP as Kemper’s independent registered public accountant for fiscal year 2018, (v) a non-binding advisory proposal to approve the compensation of Kemper’s named executive officers, as described in this joint proxy statement/prospectus and (vi) any other business as may be properly brought before the Kemper annual meeting.

The Kemper board of directors unanimously recommends that holders of Kemper common stock vote (i) “FOR” the share issuance proposal, (ii) “FOR” the Kemper meeting adjournment proposal, (iii) “FOR” the election of each of the director nominees named in this joint proxy statement/prospectus, (iv) “FOR” the non-binding advisory proposal to ratify the selection of Deloitte & Touche LLP as Kemper’s independent registered public accountant for fiscal year 2018 and (v) “FOR” the non-binding advisory proposal to approve the compensation of Kemper’s named executive officers, as described in this joint proxy statement/prospectus.

At the Infinity special meeting, Infinity shareholders will be asked to vote on (i) the merger proposal, (ii) a proposal to approve, by a non-binding advisory vote, the compensation that may be paid or become payable to Infinity’s named executive officers that is based on or otherwise relates to the Merger contemplated by the Merger Agreement (the “non-binding compensation advisory proposal”) and (iii) a proposal to adjourn the Infinity special meeting, for a period no longer than twenty (20) business days in the aggregate, for the absence of a quorum or to allow reasonable additional time to solicit proxies in favor of the merger proposal if there are insufficient votes at the time of the Infinity special meeting or any adjournment or postponement thereof (the “Infinity meeting adjournment proposal”).

The Infinity board of directors unanimously recommends that holders of Infinity common stock vote (i) “FOR” the merger proposal, (ii) “FOR” the non-binding compensation advisory proposal and (iii) “FOR” the Infinity meeting adjournment proposal.

The proposals are being presented to the Kemper stockholders and Infinity shareholders at the Kemper annual meeting and Infinity special meeting, respectively. The dates, times and places of the meetings are as follows:

Your vote is very important. Whether or not you plan to attend your company’s meeting, please take the time to vote by completing and mailing the enclosed proxy card or, if the option is available to you, by granting your proxy electronically over the Internet or by telephone.

This joint proxy statement/prospectus contains important information about Kemper, Infinity, the Merger Agreement, the proposed Merger, the Kemper annual meeting and the Infinity special meeting. We encourage you to read carefully this joint proxy statement/prospectus before voting, including the section entitled “Risk Factors” beginning on page 38.

We hope to see you at the Kemper annual meeting and Infinity special meeting, as the case may be, and look forward to a successful closing.

Neither the Securities and Exchange Commission nor any state or provincial securities regulator has approved or disapproved of the Merger or the other transactions described in this joint proxy statement/prospectus or the securities to be issued pursuant to the Merger Agreement or determined if the information contained in this joint proxy statement/prospectus is accurate or adequate. Any representation to the contrary is a criminal offense.

This joint proxy statement/prospectus is dated April [X], 2018, and is first being mailed to Kemper stockholders and Infinity shareholders on or about April [X], 2018.

ADDITIONAL INFORMATION

The accompanying document is the proxy statement of Infinity for the Infinity special meeting, the proxy statement of Kemper for the Kemper annual meeting and the prospectus of Kemper for the shares of its common stock to be issued in the Merger. The accompanying joint proxy statement/prospectus incorporates by reference important business and financial information about Kemper and Infinity from documents that are not included in or delivered with the accompanying joint proxy statement/prospectus. You can obtain the documents that are incorporated by reference into the accompanying joint proxy statement/prospectus (other than certain exhibits or schedules to those documents), without charge, by requesting them in writing or by telephone from Kemper or Infinity at the following addresses and telephone numbers, or through the Securities and Exchange Commission website at www.sec.gov:

In addition, if you have questions about the proposed Merger or the accompanying joint proxy statement/prospectus, would like additional copies of the accompanying joint proxy statement/prospectus or need to obtain proxy cards or other information related to the proxy solicitation, please contact Innisfree M&A Incorporated, the proxy solicitor for Kemper, toll-free at (888) 750-5834 or collect at (212) 750-5833, or D.F. King & Co., Inc., the proxy solicitor for Infinity, toll-free at (800) 706-3274. You will not be charged for any of these documents that you request.

To obtain timely delivery of the documents, you must request them no later than five business days before the date of the Kemper annual meeting or Infinity special meeting, as applicable. Therefore, if you would like to request documents from Kemper, please do so by May 24, 2018 in order to receive them before the Kemper annual meeting. If you would like to request documents from Infinity, please do so by May 24, 2018, in order to receive them before the Infinity special meeting.

See “Where You Can Find More Information” beginning on page 279 of the accompanying joint proxy statement/prospectus for further information.

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS TO BE HELD ON JUNE 1, 2018

To the Stockholders of Kemper Corporation (“Kemper”):

Kemper will hold its annual meeting (the “Kemper annual meeting”) of stockholders at The Kemper Building, 20th Floor, One East Wacker Drive, Chicago, Illinois 60601 on June 1, 2018, at 8:00 a.m. local time, for the following purposes:

The Kemper Board has fixed April 16, 2018 as the record date for determining stockholders entitled to receive this notice and to vote at the Kemper annual meeting (the “Kemper record date”). Only Kemper stockholders of record at the close of business on the Kemper record date will be entitled to notice of, and to vote at, the Kemper annual meeting and any adjournments or postponements thereof. A list of registered Kemper stockholders entitled to vote at the Kemper annual meeting will be available for inspection during ordinary business hours at the executive offices of Kemper at One East Wacker Drive, Chicago, Illinois 60601 at least ten (10) days prior to the Kemper annual meeting.

The Kemper Board unanimously recommends that you vote (i) “FOR” the share issuance proposal, (ii) “FOR” the Kemper meeting adjournment proposal, (iii) “FOR” the election of each of the director nominees named in this joint proxy statement/prospectus, (iv) “FOR” the non-binding advisory proposal to ratify the selection of Deloitte & Touche LLP as Kemper’s independent registered public accountant for fiscal year 2018 and (v) “FOR” the non-binding advisory proposal to approve the compensation of Kemper’s named executive officers.

Your vote is very important. We cannot complete the merger described in this joint proxy statement/prospectus unless we receive the affirmative vote in favor of the share issuance proposal by the holders of at least a majority of the votes cast at the Kemper annual meeting, provided that a quorum is present. Under the current rules and interpretive guidance of the New York Stock Exchange, if you abstain from voting with respect to the share issuance proposal, it will have the same effect as a vote “AGAINST” the share issuance proposal. The failure of a Kemper stockholder who holds his or her shares in “street name” through a bank, broker, trust or other nominee holder of record to give voting instructions to that bank, broker, trust or other nominee holder of

record or any other failure of a Kemper stockholder to vote will have no effect on the approval of the share issuance proposal.

It is important that your shares be represented and voted whether or not you plan to attend the Kemper annual meeting in person. Instructions regarding the different methods for voting your shares are provided under the section entitled “Questions and Answers About the Kemper Annual Meeting and Infinity Special Meeting.”

April [X], 2018

NOTICE OF SPECIAL MEETING OF SHAREHOLDERS TO BE HELD ON JUNE 1, 2018

To the Shareholders of Infinity Property and Casualty Corporation (“Infinity”):

Infinity will hold a special meeting (the “Infinity special meeting”) of holders of Infinity common stock, no par value per share (“Infinity common stock”) at Infinity Property and Casualty Corporation, located at 2201 4th Avenue North, Birmingham, Alabama 35203, on June 1, 2018, at 8:00 a.m. local time, for the following purposes:

The board of directors of Infinity (the “Infinity Board”) has fixed the close of business on April 20, 2018 as the record date for determining shareholders entitled to receive this notice and to vote at the Infinity special meeting (the “Infinity record date”). Only Infinity shareholders of record at the close of business on the Infinity record date will be entitled to notice of, and to vote at, the Infinity special meeting and any adjournments or postponements thereof. A list of registered Infinity shareholders entitled to vote at the Infinity special meeting will be available for inspection during ordinary business hours at the executive offices of Infinity at 2201 4th Avenue North, Birmingham, Alabama 35203 at least ten (10) days prior to the Infinity special meeting.

The Infinity Board unanimously recommends that holders of Infinity common stock vote “FOR” the merger proposal, “FOR” the non-binding compensation advisory proposal and “FOR” the Infinity meeting adjournment proposal.

Your vote is very important. We cannot complete the merger described in this joint proxy statement/prospectus unless the merger proposal receives the affirmative vote of Infinity shareholders entitled to exercise a majority of the voting power of Infinity. If you abstain from voting, fail to give voting instructions to a bank, broker, trust or other nominee holder of record if you hold your shares in “street name” through such bank, broker, trust or other nominee holder of record, or if you otherwise fail to vote, it will have the same effect as voting “AGAINST” the merger proposal. It is important that your shares be represented and voted whether or not you plan to attend the Infinity special meeting in person. Instructions regarding the different methods for voting your shares are provided under the section entitled “Questions and Answers About the Kemper Annual Meeting and Infinity Special Meeting.”

April [X], 2018

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CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING STATEMENTS

This joint proxy statement/prospectus contains certain statements regarding intentions, beliefs and expectations or predictions for the future of Kemper Corporation (“Kemper”) and Infinity Property and Casualty Corporation (“Infinity,” and collectively with Kemper, “we,” “us,” and “our”), which are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Forward-looking statements give expectations, intentions, beliefs or forecasts of future events or otherwise, and can be identified by the fact that they relate to future actions, performance or results rather than relating strictly to historical or current facts. Words such as “believe(s),” “goal(s),” “target(s),” “estimate(s),” “anticipate(s),” “forecast(s),” “project(s),” “plan(s),” “intend(s),” “expect(s),” “might,” “may,” “could” and variations of such words and other words and expressions of similar meaning are intended to identify such forward-looking statements. However, the absence of such words or other words and expressions of similar meaning does not mean that a statement is not forward-looking.

Any or all forward-looking statements may turn out to be wrong, and, accordingly, readers are cautioned not to place undue reliance on such statements. Forward-looking statements involve a number of risks and uncertainties that are difficult to predict and are not guarantees or assurances of future performance. No assurances can be given that the results and financial condition contemplated in any forward-looking statements will be achieved or will be achieved in any particular timetable. In evaluating these forward-looking statements, you should consider carefully the risks described herein and in other reports that Kemper and Infinity file with the Securities and Exchange Commission (the “SEC”). See “Risk Factors” and “Where You Can Find More Information” beginning on page 279.

With respect to the proposed transaction and the combined company, the risks, uncertainties and other factors that could cause actual results, performance, prospects or opportunities to differ materially from those expressed in, or implied by, forward-looking statements include, without limitation:

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YOU ARE CAUTIONED NOT TO PLACE UNDUE RELIANCE ON ANY FORWARD-LOOKING STATEMENTS, ALL OF WHICH SPEAK ONLY AS OF THE DATE OF THIS JOINT PROXY STATEMENT/PROSPECTUS. KEMPER AND INFINITY UNDERTAKE NO DUTY OR OBLIGATION TO UPDATE OR CORRECT ANY FORWARD-LOOKING STATEMENT AS A RESULT OF EVENTS, CHANGES, EFFECTS, STATES OF FACTS, CONDITIONS, CIRCUMSTANCES, OCCURRENCES OR DEVELOPMENTS SUBSEQUENT TO THE DATE OF THIS JOINT PROXY STATEMENT/PROSPECTUS, EXCEPT AS REQUIRED BY LAW.

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QUESTIONS AND ANSWERS ABOUT THE KEMPER ANNUAL MEETING

AND INFINITY SPECIAL MEETING

The following are some questions that you, as a Kemper stockholder or an Infinity shareholder, may have regarding the annual meeting of Kemper stockholders (the “Kemper annual meeting”) or the special meeting of Infinity shareholders (the “Infinity special meeting”) and brief answers to those questions. For more detailed information about the matters discussed in these questions and answers, see “The Kemper Annual Meeting” and “The Infinity Special Meeting” beginning on pages 46 and 53 of this joint proxy statement/prospectus, respectively. Kemper and Infinity encourage you to read carefully the remainder of this joint proxy statement/prospectus because the information in this section does not provide all of the information that might be important to you with respect to the matters being considered at the Kemper annual meeting or the Infinity special meeting. Additional important information is also contained in the Annexes to, and in the documents incorporated by reference into, this joint proxy statement/prospectus. See “Where You Can Find More Information” beginning on page 279 of this joint proxy statement/prospectus.

In addition, this joint proxy statement/prospectus also serves as a proxy statement for other matters not related to the Merger to be voted on by Kemper stockholders at the Kemper annual meeting. See “The Kemper Annual Meeting” beginning on page 46.

This joint proxy statement/prospectus is also a prospectus for Infinity shareholders because, pursuant to the Merger Agreement, Kemper is offering shares of Kemper common stock, par value $0.01 per share (“Kemper common stock”) to be issued in exchange for shares of Infinity common stock in the Merger, at the election of Infinity shareholders.

In order to complete the Merger, Kemper stockholders must approve the issuance of new shares of Kemper common stock pursuant to the Merger Agreement (i.e., approve the “share issuance proposal” as defined below) and Infinity shareholders must adopt the Merger Agreement (i.e., approve the “merger proposal” as defined below).

This joint proxy statement/prospectus contains important information about the Merger Agreement, the Merger, the Kemper annual meeting and the Infinity special meeting, and you should read it carefully. The enclosed voting materials allow you to vote your shares without attending the Kemper annual meeting or Infinity special meeting in person.

Your vote is important. We encourage you to vote as soon as possible.

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The Infinity special meeting will take place on June 1, 2018, at 8:00 a.m. local time, at Infinity Property and Casualty Corporation, 2201 4th Avenue North, Birmingham, Alabama 35203.

Kemper stockholders are also voting on a proposal to adjourn the Kemper annual meeting, for a period no longer than twenty (20) business days in the aggregate, for the absence of a quorum or to allow reasonable additional time to solicit proxies in favor of the share issuance proposal if there are insufficient votes at the time of the Kemper annual meeting or any adjournment or postponement thereof to approve the share issuance proposal (the “Kemper meeting adjournment proposal”). The approval by Kemper stockholders of the Kemper meeting adjournment proposal is not a condition to the closing.

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See “The Kemper Annual Meeting” beginning on page 46.

Under Section 14A of the Exchange Act, which was enacted as part of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (“Dodd-Frank”), Infinity is required to provide its shareholders the opportunity to vote to approve, by a non-binding advisory vote, the compensation that may be paid or become payable to Infinity’s named executive officers that is based on or otherwise relates to the Merger contemplated by the Merger Agreement. Accordingly, Infinity shareholders are being provided with the opportunity to cast an advisory vote on such payments. The approval by Infinity shareholders of this proposal (the “non-binding compensation advisory proposal”) is not a condition to the closing.

Infinity shareholders are also voting on a proposal to adjourn the Infinity special meeting, for a period no longer than twenty (20) business days in the aggregate, for the absence of a quorum or to allow reasonable additional time to solicit proxies in favor of the merger proposal if there are insufficient votes at the time of the Infinity special meeting or any adjournment or postponement thereof (the “Infinity meeting adjournment proposal”). The approval by Infinity shareholders of the Infinity meeting adjournment proposal is not a condition to the closing.

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The Infinity Board has fixed April 20, 2018 as the record date (the “Infinity record date”) for determining shareholders entitled to receive notice of and to vote at the Infinity special meeting or any adjournments or postponements thereof. Only shareholders of record at the close of business on the Infinity record date for the Infinity special meeting will be entitled to notice of, and to vote at, the Infinity special meeting and any adjournments or postponements thereof. As of the Infinity record date, there were 10,941,936 shares of Infinity common stock outstanding and entitled to vote at the Infinity special meeting, held by approximately 60 holders of record. Each holder of Infinity common stock is entitled to one vote for each share of Infinity common stock owned as of the Infinity record date.

With respect to (i) the share issuance proposal, (ii) the Kemper meeting adjournment proposal, (iii) the non-binding advisory proposal to ratify the selection of Deloitte & Touche LLP as Kemper’s independent registered public accountant for fiscal year 2018 and (iv) the non-binding advisory proposal to approve the compensation of Kemper’s named executive officers, as described in this joint proxy statement/prospectus, the affirmative vote of a majority of the votes cast with respect to each proposal will approve such proposal, provided a quorum is present.

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Both Kemper and Infinity strongly encourage their stockholders and shareholders of record, respectively, to vote using the enclosed proxy card.

If you hold Kemper common stock or Infinity common stock in “street name,” which means your shares are held of record by a bank, broker, trust or other nominee holder of record, you must provide the record holder of your shares with instructions on how to vote your shares. Please refer to the voting instruction card used by your bank, broker, trust or other nominee holder of record to see if you may submit voting instructions using the Internet or by telephone.

Holders of Kemper common stock or Infinity common stock may also vote in person by attending the Kemper annual meeting or Infinity special meeting, as applicable. If you plan to attend the Kemper annual meeting or Infinity special meeting and wish to vote in person, you will be given a ballot at the applicable meeting. Please note, however, that if your shares are held in “street name” and you wish to vote in person at your company’s meeting, you must bring a legal proxy, executed in your favor, from the record holder of the shares authorizing you to vote at the meeting. For additional information, see “The Kemper Annual Meeting” and “The Infinity Special Meeting” beginning on pages 46 and 53 of this joint proxy statement/prospectus, respectively.

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Whether or not you plan to attend the Kemper annual meeting or Infinity special meeting, you are encouraged to vote your shares by proxy as described in this joint proxy statement/prospectus.

If voting instructions for shares held pursuant to the 401(k) and Retirement Plan are provided prior to the 401(k) Deadline, the plan trustee will confidentially vote such shares in accordance with the voting instructions. In accordance with the terms of the 401(k) and Retirement Plan, if voting instructions for shares held pursuant to the 401(k) and Retirement Plan are not provided prior to the 401(k) Deadline, the plan trustee will vote such shares in the same proportion as all other shares voted in accordance with timely voting instructions provided to the trustee by all other plan participants.

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All properly submitted proxies received by Kemper before the Kemper annual meeting that are not revoked or changed prior to being exercised at the Kemper annual meeting will be voted at the Kemper annual meeting in accordance with the instructions indicated on the proxies or, if no instructions were provided, (i) “FOR” the share issuance proposal, (ii) “FOR” the Kemper meeting adjournment proposal, (iii) “FOR” the election of each of the Nominees, (iv) “FOR” the non-binding advisory proposal to ratify the selection of Deloitte & Touche LLP as Kemper’s independent registered public accountant for fiscal year 2018 and (v) “FOR” the non-binding advisory proposal to approve the compensation of Kemper’s named executive officers.

For purposes of the Infinity shareholder proposals:

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All properly submitted proxies received by Infinity before the Infinity special meeting that are not revoked or changed prior to being exercised at the Infinity special meeting will be voted at the Infinity special meeting in accordance with the instructions indicated on the proxies or, if no instructions were provided, “FOR” the merger proposal, “FOR” the non-binding compensation advisory proposal and “FOR” the Infinity meeting adjournment proposal.

Under the applicable stock exchange rules, matters subject to a stockholder vote are classified as “routine” or “non-routine.” In the case of “non-routine” matters, a bank, broker, trust or other nominee holder of record may not vote shares held in “street name” for which they have not received instructions from the beneficial owner (referred to as “broker non-votes”), whereas they may vote those shares in their discretion in the case of any “routine” matter. The non-binding advisory proposal submitted to Kemper stockholders to ratify the selection of Deloitte & Touche LLP as Kemper’s independent registered public accountant for fiscal year 2018 is a “routine” matter. All other proposals submitted to Kemper stockholders and Infinity shareholders are “non-routine” matters. Accordingly, shares of Kemper common stock or Infinity common stock held in “street name” by a bank, broker, trust or other nominee holder of record will NOT be voted by such bank, broker, trust or other nominee holder of record on any of the proposals with respect to “non-routine” matters unless the beneficial owner of such shares has properly instructed such bank, broker, trust or other nominee holder of record how to vote.

If your shares are held through the 401(k) and Retirement Plan, you can change your vote by:

If your shares are held in a “street name” account, you must contact your bank, broker, trust or other nominee to change your vote.

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If you hold your shares of Infinity common stock in book-entry form, after the closing, you need only to deliver the Form of Election for your shares to automatically be exchanged for the applicable Merger Consideration, including cash in lieu of fractional shares of Kemper common stock, if any.

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For detailed illustrations of the potential proration and adjustment of the Cash Consideration and Stock Consideration for those Infinity shareholders electing to receive solely Cash Consideration or solely Stock Consideration, see “The Merger Agreement—Allocation of Merger Consideration and Illustrative Elections and Calculations” beginning on page 180.

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If you are a Kemper stockholder, please contact Innisfree M&A Incorporated, Kemper’s proxy solicitor:

501 Madison Avenue, 20th floor

New York, New York 10022

Kemper stockholders may call toll free: (888) 750-5834

Banks and brokers may call collect: (212) 750-5833

If you are an Infinity shareholder, please contact D.F. King & Co., Inc., Infinity’s proxy solicitor:

D.F. King & Co., Inc.

48 Wall Street

New York, NY 10005

Toll-free: (800) 706-3274

Banks and Brokers: (212) 269-5550

Email: IPCC@dfking.com

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RISK FACTORS

The combined company will be faced with a market environment that cannot be predicted and that involves significant risks, many of which will be beyond its control. In addition to the other information contained in this joint proxy statement/prospectus, you should consider carefully the material risks described below before deciding whether to vote for the proposals to be considered at the Kemper annual meeting and Infinity special meeting. You should also read and consider the other information in this joint proxy statement/prospectus and the other documents incorporated by reference into this joint proxy statement/prospectus, including the matters addressed under the heading “Cautionary Statement Concerning Forward-Looking Statements.” See also “Where You Can Find More Information” on page 279.

Risks Relating to the Merger and the Combined Company

The combined company may not realize all of the anticipated benefits of the transactions contemplated by the Merger Agreement or such benefits may take longer to realize than expected.

The success of the Merger will depend, in part, on the combined company’s ability to realize the anticipated benefits from combining the businesses of Kemper and Infinity as further described in “The Merger—Recommendation of the Kemper Board and Its Reasons for the Merger” and “The Merger—Recommendation of the Infinity Board and Its Reasons for the Merger.” The combined company’s ability to realize the anticipated benefits of the Merger will depend, to a large extent, on the ability of Kemper to integrate the businesses of Infinity with Kemper. The combination of two independent companies is a complex, costly and time-consuming process. As a result, the combined company will be required to devote significant management attention and resources to integrating the business practices and operations of Kemper and Infinity. The integration process may disrupt the business of either or both of the companies and, if implemented ineffectively, could preclude realization of the full benefits expected by Kemper and Infinity. The failure of the combined company to meet the challenges involved in integrating successfully the operations of Kemper and Infinity or otherwise to realize the anticipated benefits of the transactions could cause an interruption of, or a loss of momentum in, the activities and business operations of the combined company and could seriously harm its results of operations. In addition, the overall integration of the two companies may result in material unanticipated problems, expenses, liabilities, competitive responses, loss of agent relationships and diversion of management’s attention, and may cause the combined company’s stock price to decline. The difficulties of combining the operations of the companies include, among others:

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Many of these factors will be outside of the combined company’s control and any one of them could result in increased costs, decreases in the amount of expected revenues and diversion of management’s time and energy, which could materially impact the combined company’s business, financial condition and results of operations. In addition, even if the operations of Kemper and Infinity are integrated successfully, the combined company may not realize the full benefits of the transactions, including the synergies, cost savings or growth opportunities that the combined company expects. These benefits may not be achieved within the anticipated time frame, or at all. As a result, Kemper and Infinity cannot assure you that the combination of Infinity with Kemper will result in the realization of the full benefits anticipated from the transactions contemplated by the Merger Agreement.

The price of Kemper common stock might decline prior to the closing, which would decrease the value of the Merger Consideration to be received by Infinity shareholders pursuant to the Merger Agreement. Further, at the Kemper annual meeting and Infinity special meeting, Kemper stockholders and Infinity shareholders will not know the exact value of Kemper common stock that will be issued pursuant to the Merger Agreement.

The market price of Kemper common stock at the time the Merger is completed might increase or decrease significantly from the price on the date of the Merger Agreement or from the price on the date of the Kemper annual meeting and Infinity special meeting. On February 12, 2018, the day prior to the date of media publications regarding the proposed Merger, Kemper common stock closed at $57.75 per share as reported on the NYSE. From February 13, 2018, through April 23, 2018, the trading price of Kemper common stock ranged from a closing high of $59.20 per share to a closing low of $53.55 per share on the NYSE.

Upon the closing, Infinity shareholders will be entitled to receive for each share of Infinity common stock that they own, at the election of each shareholder, consideration in the form of a combination of Kemper common stock and cash, only cash or only Kemper common stock. The proportion of the consideration payable to holders of Infinity common stock in Kemper common stock is fixed and will not be adjusted for changes in the stock prices of either company before the Merger is consummated. As a result, any changes in the market price of Kemper common stock will have a corresponding effect on the market value of the Mixed Consideration and Stock Consideration. Neither party, however, has a right to terminate the Merger Agreement based upon changes in the market price of Kemper or Infinity common stock.

Kemper and Infinity are working to complete the transactions as promptly as practicable. Kemper currently expects that the Merger will be completed during the third quarter of 2018, subject to the satisfaction or waiver of the conditions to the closing. Because the date when the transactions are completed will be later than the date of the Kemper annual meeting and Infinity special meeting, Kemper stockholders and Infinity shareholders will not know the exact value of the Kemper common stock that will be issued pursuant to the Merger Agreement at the time they vote on the share issuance proposal, in the case of Kemper stockholders, or on the merger proposal, in the case of Infinity shareholders. As a result, if the market price of Kemper common stock upon the closing is lower than the market price on the date of the Infinity special meeting, the market value of the Mixed Consideration and Stock Consideration received by Infinity shareholders pursuant to the Merger Agreement will be lower than the market value of the Mixed Consideration and Stock Consideration at the time of the vote by the Infinity shareholders. Moreover, during the period between the Kemper annual meeting and Infinity special meeting and the closing, events, conditions or circumstances could arise that could have a material impact or effect on Kemper, Infinity or the industries in which they operate.

If the combined company is unable to manage its growth, its business and financial results could suffer.

The combined company’s future financial results will depend in part on its ability to profitably manage its core businesses, including any growth that the combined company may be able to achieve. Over the past several years, each of Kemper and Infinity has engaged in the identification of, and competition for, growth and expansion opportunities. In order to achieve those initiatives, the combined company will need to, among other things, recruit, train, retain and effectively manage employees and expand its operations and financial control

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systems. If the combined company is unable to manage its businesses effectively and profitably, its business and financial results could suffer.

To be successful, the combined company must retain and motivate key employees, including those experienced with post-acquisition integration, and failure to do so could seriously harm the combined company.

The success of the combined company following the Merger largely depends on the skills, experience and continued efforts of management and other key personnel for each of Kemper and Infinity. As a result, to be successful, the combined company must retain and motivate executives and other key employees. Certain specified management employees of Infinity have executed retention letters with Kemper to continue their employment for a period of two (2) years following the Merger. However, certain key managers and functional area employees will continue to be at-will employees following the Merger and there is no assurance that these individuals will remain with the combined company. If these personnel were to leave, the combined company may experience increased difficulty in managing the ongoing business operations and integrating the businesses and may not be able to adequately replace such personnel, which could have a material adverse effect on the combined company’s overall business, results of operations and financial condition. Additionally, the combined company’s failure to retain key managers and employees will result in the roles and responsibilities of such managers and employees to be filled either by existing or new personnel, which may require the combined company to devote time and resources to identifying, hiring and integrating replacements for the departed managers and employees that could otherwise be used to integrate the businesses of Kemper and Infinity or otherwise pursue business opportunities. There can be no assurance that the combined company will be able to retain and motivate its employees in the same manner as Kemper and Infinity.

Kemper and Infinity may be targets of securities class action and derivative lawsuits which could result in substantial costs and may delay or prevent the Merger from being completed.

Securities class action lawsuits and derivative lawsuits are often brought against public companies that have entered into merger agreements. Even if the lawsuits are without merit, defending against these claims can result in substantial costs and divert management time and resources. An adverse judgment could result in monetary damages, which could have a negative impact on Kemper’s and Infinity’s respective liquidity and financial condition. Additionally, if a plaintiff is successful in obtaining an injunction prohibiting the closing, then that injunction may delay or prevent the Merger from being consummated, which may adversely affect Kemper’s and Infinity’s respective business, financial position and results of operation. Currently, neither Kemper nor Infinity is aware of any securities class action lawsuits or derivative lawsuits having been filed in connection with the Merger.

Regulatory approvals may not be received, may take longer than expected or may impose conditions that are not presently anticipated or that cannot be met.

Before the transactions contemplated by the Merger Agreement, including the Merger, may be completed, various clearances, approvals and declarations of non-disapproval must be obtained from certain regulatory and governmental authorities as described in “The Merger—Regulatory Approvals” beginning on page 164. These regulatory and governmental entities may impose conditions on the granting of such approvals. Such conditions and the process of obtaining regulatory approvals could have the effect of delaying the closing or of imposing additional costs or limitations on the combined company following the Merger. The regulatory approvals may not be received at all, may not be received in a timely fashion and may contain conditions on the closing. However, if any such conditions impose a materially burdensome condition, Kemper and Merger Sub will not be obligated to complete the Merger. In addition, the respective obligations of each of Kemper, Merger Sub and Infinity to complete the Merger are conditioned on the receipt of certain regulatory approvals or waiver by the other party of such condition.

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Certain directors and executive officers of Infinity have interests in the Merger that are different from, or in addition to, the interests of Infinity shareholders.

Certain directors and executive officers of Infinity have interests in the Merger that are in addition to their interests as Infinity shareholders generally. For executive officers, these interests include, but are not limited to, continued employment with the combined company and the treatment in the Merger of Infinity performance share awards, Director Restricted Shares and Infinity restricted shares held by certain directors and executive officers, as applicable (including accelerated vesting of the Infinity performance share awards and Director Restricted Shares, each immediately upon the effective time). At the request of Kemper, three (3) executive officers of Infinity have also entered into retention letter agreements with Kemper pursuant to which each such executive has indicated his intent to enter into employment with Kemper following the closing in exchange for the compensation specified in his respective retention letter agreement. In addition, one individual who was serving on the Infinity Board as of February 13, 2018 or immediately prior to the effective time, with such individual being selected by Kemper in its sole discretion, will become a director of the combined company. The Infinity Board was aware of these interests and considered them, among other matters, in approving the Merger Agreement and in determining to recommend that Infinity shareholders adopt the merger proposal. See “The Merger—Interests of Infinity’s Directors and Executive Officers in the Merger” on page 172.

The combined company will record goodwill and intangible assets that could become impaired and adversely affect its results of operations and financial condition.

Accounting standards in the United States require that one party to the Merger be identified as the acquirer. In accordance with these standards, the Merger will be accounted for as an acquisition of Infinity by Kemper and will follow the acquisition method of accounting for business combinations. The assets and liabilities of Infinity will be consolidated with those of Kemper. The excess of the purchase price over the fair values of Infinity’s assets and liabilities, if any, will be recorded as goodwill. The unaudited pro forma condensed combined balance sheet as of December 31, 2017 reflects $511.8 million of goodwill and $349.9 million of intangible assets resulting from the Merger, which are based on Kemper management’s preliminary fair value estimates and are subject to change, including due to fluctuations in the market value of Kemper common stock as discussed in Note 5 to the “Kemper Corporation and Infinity Property and Casualty Corporation Unaudited Pro Forma Condensed Combined Financial Statements.”

The combined company will be required to assess goodwill and intangible assets for impairment at least annually. In the future the combined company may take charges against earnings resulting from impairment. Any determination requiring the write off of a significant portion of the combined company’s goodwill or other intangible assets could adversely affect the combined company’s results of operations and financial condition.

The market price of the common stock of the combined company may be affected by factors different from those affecting the market price for shares of Infinity common stock or for shares of Kemper common stock.

Upon the closing, holders of Infinity common stock will become holders of Kemper common stock. Kemper’s business differs from that of Infinity, and the business of the combined company will differ from that of Kemper. Accordingly, the results of operations for the combined company will be affected by factors different from those currently affecting the results of operations of Infinity and may be affected by factors different from those currently affecting the results of operations of Kemper. For a discussion of the businesses of Kemper and of certain factors to consider in connection with those businesses, see the see the section entitled “Information About Kemper and Merger Sub” and the documents incorporated by reference in this joint proxy statement/prospectus and referred to in the section entitled “Where You Can Find More Information.” For a discussion of the businesses of Infinity and of certain factors to consider in connection with those businesses, see the section entitled “Information About Infinity.” See also the section entitled “Summary—Comparative Per Share Market Price Data and Dividend Information” for additional information on the market value of shares of Kemper common stock and Infinity common stock.

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The issuance of shares of Kemper common stock to Infinity shareholders pursuant to the Infinity Merger Agreement will reduce the percentage ownership interests of Kemper’s pre-existing stockholders. Based on the number of shares of common stock of Infinity outstanding on the Infinity record date, Kemper expects to issue or reserve for issuance approximately 13.2 million shares of Kemper common stock in connection with the Merger (including shares of Kemper common stock issuable to Infinity shareholders and shares issuable pursuant to certain of Infinity’s equity-based awards). Based on this number and the number of shares of Kemper common stock outstanding on the Kemper record date, upon the closing, pre-existing Kemper stockholders and former Infinity shareholders would own approximately 80% and 20% of the outstanding shares of Kemper common stock, respectively, immediately following the closing. The Merger will have no effect on the number of shares of Kemper common stock owned by existing Kemper stockholders. The issuance of approximately 13.2 million shares of Kemper common stock to Infinity shareholders and holders of equity-based incentive awards will cause a significant reduction in the relative percentage interests of current Kemper stockholders in earnings, voting, liquidation value and book and market value. See “Summary—Ownership of Kemper After the Merger.”

Infinity shareholders may receive a form or combination of consideration different from what they elect.

While each holder of Infinity common stock may elect to receive, in connection with the Merger, the Mixed Consideration, Cash Consideration or Stock Consideration, the total amount of cash and the total number of shares of Kemper common stock available for all Infinity shareholders will be fixed. Accordingly, depending on the elections made by other Infinity shareholders, even if a holder of Infinity common stock elects to receive all cash in connection with the Merger, such holder may ultimately receive a portion of the consideration in Kemper common stock and if a holder of Infinity common stock elects to receive all Kemper common stock in connection with the Merger, such holder may receive a portion of the Merger Consideration in cash. See “The Merger Agreement—Allocation of Merger Consideration and Illustrative Elections and Calculations” for more information. If a holder of Infinity common stock does not submit a properly completed and signed Form of Election to the exchange agent by the Election Deadline, then such stockholder will have no control over the type of Merger Consideration such stockholder may receive and will receive Mixed Consideration consisting of both cash and Kemper common stock. No fractional shares of Kemper common stock will be issued in the Merger, and all Infinity shareholders, regardless of their election, will receive cash in lieu of any fractional shares of Kemper common stock.

If you deliver shares of Infinity common stock to make an election, you will not be able to sell those shares unless you revoke your election prior to the Election Deadline.

If you are a holder of Infinity common stock and want to elect to receive the Cash Consideration or Stock Consideration in exchange for your shares, you must deliver to the exchange agent by the Election Deadline a properly completed Form of Election. Following the delivery of a completed Form of Election, you will not be able to transfer such shares unless you revoke your election before the Election Deadline by providing written notice to the exchange agent. If you do not revoke your election before the Election Deadline, you will not be able to liquidate your investment in Infinity common stock for any reason until you receive the Merger Consideration.

The opinions of Kemper’s and Infinity’s financial advisors will not reflect changes in circumstances between the original signing of the Merger Agreement on February 13, 2018 and the closing.

Kemper and Infinity each received opinions from their respective financial advisors as of February 13, 2018 and do not expect to receive updated fairness opinions prior to the closing. Changes in the operations and prospects of Kemper or Infinity, general market and economic conditions and other factors that may be beyond the control of Kemper or Infinity, and on which Kemper’s and Infinity’s financial advisor’s opinions were based, may significantly alter the value of Kemper or the prices of the shares of Infinity’s common stock or Kemper common stock by the time the Mergers are completed. The opinions do not speak as of the time the Merger will be completed or as of any date other than the date of such opinions. Because Kemper’s and Infinity’s financial

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advisors will not be updating their opinions, which were issued in connection with the signing of the Merger Agreement, the opinions will not address the fairness of the Merger Consideration from a financial point of view at the time the Mergers are completed. The Kemper Board’s recommendation that Kemper stockholders vote “FOR” the share issuance proposal and the Infinity Board’s recommendation that Infinity shareholders vote “FOR” the merger proposal, however, are current as of the date of this joint proxy statement/prospectus. For a description of the opinions that Infinity and Kemper received from their respective financial advisors, please refer to “The Merger—Opinion of Kemper’s Financial Advisors” and “The Merger—Opinion of Infinity’s Financial Advisor.”

The Merger Agreement contains provisions that may discourage other companies from trying to acquire Infinity for greater Merger Consideration or from trying to acquire Kemper.

The Merger Agreement contains provisions that may discourage a third party from submitting a business combination proposal to Infinity, both during the pendency of the proposed Merger with Kemper as well as afterward should the Merger with Kemper not be consummated, that might result in greater value to Infinity shareholders than the Merger with Kemper. These Merger Agreement provisions include a general prohibition on Infinity from soliciting, or, subject to certain exceptions, entering into discussions with any third party regarding any acquisition proposal or offers for competing transactions. In addition, Infinity may be required to pay Kemper a termination fee in certain circumstances involving acquisition proposals for competing transactions. For further information, please see “The Merger Agreement—Infinity Acquisition Proposals,” “The Merger Agreement—Termination of the Merger Agreement” and “The Merger Agreement—Reimbursement of Fees and Expenses.”

The Merger Agreement also contains provisions that may discourage a third party from submitting a business combination proposal to Kemper, both during the pendency of the proposed Merger with Infinity as well as afterward and should the Merger with Infinity not be consummated, that might result in greater value to Kemper stockholders than the Merger. These Merger Agreement provisions include a general prohibition on Kemper from soliciting, or, subject to certain exceptions, entering into discussions with any third party regarding any acquisition proposal or offers for competing transactions. In addition, Kemper may be required to pay Infinity a termination fee in certain circumstances involving acquisition proposals for competing transactions. For further information, please see “The Merger Agreement—Infinity Acquisition Proposals,” “The Merger Agreement—Termination of the Merger Agreement” and “The Merger Agreement—Reimbursement of Fees and Expenses.”

Failure to complete the Merger could negatively impact the stock prices and future businesses and financial results of Kemper and Infinity.

If the Merger is not completed, the ongoing businesses of Kemper and Infinity may be adversely affected and Kemper and Infinity will be subject to several risks and consequences, including the following:

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In addition, if the Merger is not completed, Kemper and Infinity may experience negative reactions from the financial markets and from their respective agents, policyholders, employees and business partners. Kemper and Infinity also could be subject to litigation related to any failure to complete the Merger or to enforcement proceedings commenced against Kemper or Infinity to perform their respective obligations under the Merger Agreement. If the Merger is not completed, Kemper and Infinity cannot assure their stockholders and shareholders, respectively, that the risks described above will not materialize and will not materially adversely affect the business, financial results and stock prices of Kemper and Infinity.

The shares of Kemper common stock to be received by Infinity shareholders as a result of the Merger will have different rights than shares of Infinity common stock.

Following the closing, Infinity shareholders receiving the Stock Consideration will become Kemper stockholders and their rights will be governed by the Kemper Charter, the Kemper Bylaws and the DGCL. The rights associated with Kemper common stock are different from the rights associated with Infinity common stock. See “Comparison of Rights of Kemper Stockholders and Infinity Shareholders” beginning on page 241 for a discussion of the different rights associated with Kemper common stock and Infinity common stock.

Kemper and Infinity will incur significant transaction and integration costs in connection with the Merger.

Kemper and Infinity expect to incur a number of costs associated with completing the Merger and integrating the operations of the two companies. The substantial majority of these costs will be non-recurring expenses resulting from the Merger and will consist of transaction costs related to the Merger, including costs to compensate financial advisors for their services, facilities and systems consolidation and integration costs and employment related costs. Additional unanticipated costs may be incurred in the integration of the businesses of Kemper and Infinity. Although Kemper and Infinity expect that the elimination of redundant costs, as well as the realization of other efficiencies related to the integration of the businesses, will offset incremental transaction and Merger-related costs over time, this net benefit may not be achieved in the near term, or at all.

The announcement and pendency of the Merger may adversely affect Kemper’s and Infinity’s business, financial condition and results of operations.

The announcement and pendency of the business combination may cause disruptions and create uncertainty surrounding Kemper’s and Infinity’s business, which could negatively affect certain relationships with agents, employees, policyholders and business partners, regardless of whether the Merger is consummated.

The unaudited prospective financial information included in this joint proxy statement/prospectus may not prove to be accurate and is not necessarily indicative of current values or future performance.

The unaudited prospective financial information of Kemper and Infinity contained in this joint proxy statement/prospectus involves risks, uncertainties and assumptions and is not a guarantee of future performance. The assumptions used in preparing the unaudited prospective financial information may not prove to be accurate, and other factors may affect the combined company’s financial condition or results of operations following the proposed transactions. Neither Kemper nor Infinity can provide any assurance that the results indicated in Kemper’s or Infinity’s unaudited prospective financial information will be realized or that Kemper’s or Infinity’s future financial results will not materially vary from the unaudited prospective financial information. See “Certain Unaudited Prospective Financial Information.” See “Kemper Corporation and Infinity Property and Casualty Corporation Unaudited Pro Forma Condensed Combined Financial Statements.”

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Kemper currently anticipates that the Merger will be accretive to Kemper’s earnings per share in 2019, excluding Value of Business Acquired (“VOBA”) and one-time items, and is expected to be accretive to Kemper’s earnings per share in 2020 by more than 10%, excluding restructuring and one-time items. This expectation is based on preliminary estimates, which may materially change. The combined company could also encounter additional transaction and integration-related costs or other factors such as the failure to realize all of the benefits anticipated in the Merger. All of these factors could cause dilution to the combined company’s earnings per share or decrease or delay the expected accretive effect of the Merger and cause a decrease in the price of the combined company’s common stock.

Risks Relating to Kemper

Kemper is, and will continue to be, subject to the risks described in Part I, Item 1A in Kemper’s Annual Report on Form 10-K for the year ended December 31, 2017, as filed with the SEC and incorporated by reference into this joint proxy statement/prospectus. See “Where You Can Find More Information” beginning on page 279.

Risks Relating to Infinity

Infinity is, and will continue to be, subject to the risks described in Part I, Item 1A in Infinity’s Annual Report on Form 10-K for the year ended December 31, 2017 (as amended on Form 10-K/A, filed with the SEC on April 23, 2018), as filed with the SEC and incorporated by reference into this joint proxy statement/prospectus. See “Where You Can Find More Information” beginning on page 279.

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THE KEMPER ANNUAL MEETING

General

The Kemper Board is furnishing this joint proxy statement/prospectus to solicit proxies to be voted at the Kemper annual meeting. The joint proxy statement/prospectus summary below highlights information contained elsewhere in this joint proxy statement/prospectus. Please read the entire joint proxy statement/prospectus carefully before voting as it provides Kemper stockholders with important information they need to know to be able to vote, or instruct their bank, broker, trust or other nominee to vote, at the Kemper annual meeting.

Annual Meeting of Kemper Stockholders

Date: June 1, 2018

Time: 8:00 a.m. local time

Location: The Kemper Building, 20th floor, One East Wacker Drive, Chicago, Illinois 60601.

Voting Matters and Board Recommendations

1. To consider and vote upon the share issuance proposal;

2. To consider and vote upon the Kemper meeting adjournment proposal;

3. To elect the Nominees to the Kemper Board;

4. To consider and vote on a non-binding advisory proposal to ratify the selection of Deloitte & Touche LLP as Kemper’s independent registered public accountant for fiscal year 2018;

5. To consider and vote on a non-binding advisory proposal to approve the compensation of Kemper’s named executive officers, as described in this joint proxy statement/prospectus; and

6. To consider and act upon such other business as may be properly brought before the Kemper annual meeting.

Recommendation of the Kemper Board

After careful consideration, on February 13, 2018, the Kemper Board unanimously adopted resolutions approving the Merger Agreement and the consummation of the transactions contemplated by the Merger Agreement, upon the terms and subject to the conditions set forth in the Merger Agreement.

The Kemper Board unanimously recommends that Kemper stockholders vote (i) “FOR” the share issuance proposal, (ii) “FOR” the Kemper meeting adjournment proposal, (iii) “FOR” the election of each of the Nominees, (iv) “FOR” the non-binding advisory proposal to ratify the selection of Deloitte & Touche LLP as Kemper’s independent registered public accountant for fiscal year 2018 and (v) “FOR” the non-binding advisory proposal to approve the compensation of Kemper’s named executive officers, as described in this joint proxy statement/prospectus.

For a summary of the factors considered by the Kemper Board in reaching its decision to approve the Merger Agreement and the consummation of the transactions contemplated thereby, as well as the Kemper Board’s reasons for approving, and certain risks related to, the Merger, see “The Merger—Recommendation of the Kemper Board and Its Reasons for the Merger.”

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Record Date; Outstanding Shares; Shares Entitled to Vote

Only holders of Kemper common stock at the close of business on April 16, 2018 (the “Kemper record date”), will be entitled to notice of, and to vote at, the Kemper annual meeting. At the close of business on the Kemper record date, there were 51,536,698 shares of Kemper common stock issued and outstanding. Accordingly, 51,536,698 shares of Kemper common stock are eligible to be voted at the Kemper annual meeting. Each holder of Kemper common stock is entitled to one vote for each share of Kemper common stock owned as of the Kemper record date.

A list of Kemper’s registered shareholders as of the close of business on April 16, 2018 will be available for inspection at the Kemper annual meeting and for a period of ten (10) days prior to June 1, 2018 during ordinary business hours at Kemper’s executive offices located at One East Wacker Drive, Chicago, Illinois 60601.

Vote Required; Quorum; Adjournment

The holders of a majority of the voting power of all of the shares of Kemper common stock issued and outstanding and entitled to vote at the Kemper annual meeting, present in person or represented by proxy, shall constitute a quorum for the Kemper annual meeting. A quorum must be present before stockholders can vote on any of the proposals at the Kemper annual meeting. All shares of Kemper common stock represented at the Kemper annual meeting, including abstentions and broker non-votes, will be treated as present for purposes of determining the presence or absence of a quorum. The Chairman of the Kemper annual meeting is entitled to adjourn the meeting to another place, date or time whether or not a quorum is present.

Vote required to approve the share issuance proposal. Approval of the share issuance proposal requires the affirmative vote of a majority of the votes cast at the Kemper annual meeting with respect to the share issuance proposal, provided that a quorum is present. Under the current rules and interpretive guidance of the NYSE, “votes cast” on the share issuance proposal consist of votes “FOR” or “AGAINST” as well as elections to abstain from voting on the share issuance proposal. As a result, a Kemper stockholder’s election to abstain from voting on the share issuance proposal will have the same effect as a vote “AGAINST” the approval of this proposal. The failure of a Kemper stockholder who holds his or her shares in “street name” through a bank, broker, trust or other nominee holder of record to give voting instructions to that bank, broker, trust or other nominee holder of record or any other failure of a Kemper stockholder to vote will have no effect on the approval of the share issuance proposal because these failures to vote are not considered “votes cast.”

Vote required to elect of Nominees to the Kemper Board. Each Nominee will be elected to the Kemper Board by the affirmative vote of a majority of votes cast at the Kemper annual meeting, provided that a quorum is present. As a result, a Nominee will be elected to the Kemper Board if the number of shares voted “FOR” such Nominee exceeds the number of shares voted “AGAINST” such Nominee. For purposes of the election of Nominees to the Kemper Board, a Kemper stockholder’s election to abstain from voting, the failure of a Kemper stockholder who holds his or her shares in “street name” through a bank, broker, trust or other nominee holder of record to give voting instructions to that bank, broker, trust or other nominee holder of record or any other failure of a Kemper stockholder to vote will have no effect on the election of Nominees.

Vote required to approve of all other proposals at the Kemper annual meeting. Approval of each of (i) the Kemper meeting adjournment proposal, (ii) the non-binding advisory proposal to ratify the selection of Deloitte & Touche LLP as Kemper’s independent registered public accountant for fiscal year 2018 and (iii) the non-binding advisory proposal to approve the compensation of Kemper’s named executive officers, as disclosed in this joint proxy statement/prospectus, requires the affirmative vote of a majority of the votes cast at the Kemper annual meeting with respect to such proposal, provided that a quorum is present. For purposes of these proposals, “votes cast” means votes “FOR” or “AGAINST” each proposal. As a result, a Kemper stockholder’s election to abstain from voting, the failure of a Kemper stockholder who holds his or her shares in “street name” through a bank, broker, trust or other nominee holder of record to give voting

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instructions to that bank, broker, trust or other nominee holder of record or any other failure of a Kemper stockholder to vote will have no effect on the approval of the Kemper meeting adjournment proposal and the non-binding advisory proposal to approve the compensation of Kemper’s named executive officers at the Kemper annual meeting. However, because the non-binding advisory proposal to ratify the selection of Deloitte & Touche LLP as Kemper’s independent registered public accountant for fiscal year 2018 is a “routine” matter, Kemper does not expect there to be any broker non-votes with respect to this proposal as banks, brokers, trusts or other nominee holders of record are permitted to vote in their discretion without receiving instructions from beneficial holders of Kemper common stock.

If a quorum is not present at the Kemper annual meeting, or if there are not sufficient votes in favor of the share issuance proposal, Kemper expects that the Kemper annual meeting will be adjourned to solicit additional proxies by the Chairman of the Kemper annual meeting or, subject to approval of the Kemper meeting adjournment proposal by the affirmative vote of the majority of votes cast at the Kemper annual meeting, by the Kemper stockholders. At any subsequent reconvening of the Kemper annual meeting, all proxies will be voted in the same manner as the proxies would have been voted at the original convening of the Kemper annual meeting, except for any proxies that have been effectively revoked or withdrawn prior to the subsequent meeting.

Voting by Kemper’s Directors and Executive Officers

As of the Kemper record date for the Kemper annual meeting, the directors, named executive officers and executive officers of Kemper as a group owned and were entitled to vote approximately 604,738 shares of Kemper common stock, or approximately 1.2% of the issued and outstanding shares of Kemper common stock on that date. On February 13, 2018, all of Kemper’s directors and then-employed named executive officers entered into Voting and Support Agreements with Infinity, pursuant to which such directors and named executive officers have agreed to vote or cause to be voted any shares of Kemper common stock for which they are the beneficial or record owners for the approval of the share issuance proposal and against any competing proposal or other proposal, action or transaction that would reasonably be expected to in any manner impede, frustrate, prevent or nullify the issuance of shares of Kemper common stock pursuant to the Merger Agreement or the Merger.

Accordingly, Kemper currently expects that each of its directors and named executive officers entitled to vote at the Kemper annual meeting and party to the Voting and Support Agreements with Infinity will vote their shares of Kemper common stock “FOR” the share issuance proposal and “FOR” the Kemper meeting adjournment proposal.

Voting; Proxies; Revocation

Holders of Kemper common stock as of the Kemper record date may vote by proxy or in person at the Kemper annual meeting. Votes cast by proxy or in person at the Kemper annual meeting will be tabulated and certified by Broadridge, which shall serve as the inspector of election for the Kemper annual meeting.

Voting in Person

Kemper stockholders who plan to attend the Kemper annual meeting and who own shares of Kemper common stock in their own name on the Kemper record date may vote in person at the Kemper annual meeting by written ballot or by delivering a signed proxy card. Kemper stockholders who hold their shares through the Kemper Corporation 401(k) and Retirement Plan as set forth below (the “401(k) and Retirement Plan”) must vote such shares by the 401(k) Deadline (as defined below) and, accordingly, may not vote such shares in person at the Kemper annual meeting. Kemper stockholders who hold their shares in “street name,” which means such shares are held in the name of a bank, broker, trust or other nominee holder of record, must present written evidence at the Kemper annual meeting from the institution holding such shares indicating that such Kemper stockholder was the beneficial owner of the shares held in street name on the Kemper record date and is

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authorized to vote such shares in person. This written evidence is generally called a “Legal Proxy” and should be submitted to Kemper’s Secretary, C. Thomas Evans, Jr., prior to the commencement of the Kemper annual meeting.

Voting by Proxy; Voting Shares of Kemper Common Stock held through the 401(k) and Retirement Plan by Proxy

The vote of each Kemper stockholder is very important. Accordingly, holders of Kemper common stock as of the Kemper record date should vote by proxy by:

Kemper stockholders should submit their proxy even if they plan to attend the Kemper annual meeting. Kemper stockholders can change their vote at the Kemper annual meeting. Voting instructions are included on the enclosed proxy card. If a Kemper stockholder properly submits a proxy to Kemper in time to vote, one of the individuals named as a proxy in such Kemper stockholder’s proxy will vote the shares as such Kemper stockholder has directed.

The method of voting by proxy differs for shares held as a record holder and shares held in “street name.” If a Kemper stockholder holds shares of Kemper common stock in “street name,” the Kemper stockholder will receive instructions from such stockholder’s bank, broker, trust or other nominee holder of record that the Kemper stockholder must follow in order to vote such stockholder’s shares. Such bank, broker, trust or other nominee may allow such Kemper stockholder to deliver voting instructions over the Internet, by telephone or by mail.

Unless Kemper stockholders give their banks, brokers, trusts or other nominee holders of record instructions on how to vote their shares of Kemper common stock, their banks, brokers, trusts and other nominees will not be able to vote their shares on either of the proposals at the Kemper annual meeting.

All properly executed proxies that are received prior to the Kemper annual meeting and that are not revoked will be voted at the Kemper annual meeting according to the instructions indicated on the proxies or, if no instructions are indicated, they will be voted (i) “FOR” the share issuance proposal, (ii) “FOR” the Kemper meeting adjournment proposal, (iii) “FOR” the election of each of the Nominees, (iv) “FOR” the non-binding advisory proposal to ratify the selection of Deloitte & Touche LLP as Kemper’s independent registered public accountant for fiscal year 2018 and (v) “FOR” the non-binding advisory proposal to approve the compensation of Kemper’s named executive officers, as described in this joint proxy statement/prospectus.

Holders of Kemper common stock through the 401(k) and Retirement Plan should vote by proxy by:

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If voting instructions for shares held pursuant to the 401(k) and Retirement Plan are provided prior to the 401(k) Deadline, the plan trustee will confidentially vote such shares in accordance with the voting instructions. In accordance with the terms of the 401(k) and Retirement Plan, if voting instructions for shares held pursuant to the 401(k) and Retirement Plan are not provided prior to the 401(k) Deadline, the plan trustee will vote such shares in the same proportion as all other shares voted in accordance with timely voting instructions provided to the trustee by all other plan participants.

Revocation of Proxy

A Kemper stockholder and any holder of shares of Kemper common stock through the 401(k) and Retirement Plan may revoke a proxy or change the voting instructions by taking any of the following actions:

Shares held as a registered Kemper stockholder:

Shares of Kemper common stock held through the 401(k) and Retirement Plan:

If a Kemper stockholder’s shares are held in “street name,” such stockholder should contact the institution holding such stockholder’s shares to determine the procedures, if any, for revoking or changing such stockholder’s voting instructions.

Written notices of revocation and other communications with respect to the revocation of Kemper proxies with respect to shares held of record should be addressed to:

Kemper Corporation

One East Wacker Drive

Chicago, Illinois 60601

Attention: Secretary

Abstentions and Broker Non-Votes

An abstention, which occurs when a stockholder attends a meeting, either in person or by proxy, but abstains from voting, will have the same effect as a vote “AGAINST” the share issuance approval. However, an

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