Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Scott Jonathan R
  2. Issuer Name and Ticker or Trading Symbol
FIRST INTERSTATE BANCSYSTEM INC [FIBK]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
PO BOX 30918
3. Date of Earliest Transaction (Month/Day/Year)
05/07/2018
(Street)

BILLINGS, MT 59116-0191
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Class A Common Stock 05/07/2018   C   4,916 A $ 0 10,303 D  
Class A Common Stock 05/07/2018   M   2,303 A $ 14.2 12,606 D  
Class A Common Stock 05/07/2018   M   3,386 A $ 14.37 15,992 D  
Class A Common Stock 05/07/2018   M   4,306 A $ 17.22 20,298 D  
Class A Common Stock 05/07/2018   S   15,244 D $ 41.12 (1) 5,054 D  
Class A Common Stock               4,576 I By Spouse
Class A Common Stock               13,188 I By Trust

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Options (Right to Buy) $ 19.93 05/07/2018   M     4,000 12/19/2008 12/19/2018 Class B Common Stock 4,000 $ 0 0 D  
Class B Common Stock $ 0 05/07/2018   M   4,000     (2)   (2) Class A Common Stock 4,000 $ 19.93 4,265 D  
Class B Common Stock $ 0 05/07/2018   C     4,000   (2)   (2) Class A Common Stock 4,000 $ 0 265 D  
Stock Options (Right to Buy) $ 15 05/07/2018   M     916 02/12/2010 02/12/2020 Class B Common Stock 916 $ 0 0 D  
Class B Common Stock $ 0 05/07/2018   M   916     (2)   (2) Class A Commnon Stock 916 $ 15 1,181 D  
Class B Common Stock $ 0 05/07/2018   C     916   (2)   (2) Class A Commnon Stock 916 $ 0 265 D  
Stock Options (Right to Buy) $ 14.2 05/07/2018   M     2,303 02/14/2011 02/14/2021 Class A Common Stock 2,303 $ 0 0 D  
Stock Options (Right to Buy) $ 14.37 05/07/2018   M     3,386 02/17/2012 02/17/2022 Class A Common Stock 3,386 $ 0 0 D  
Stock Options (Right to Buy) $ 17.22 05/07/2018   M     4,306 02/15/2013 02/15/2020 Class A Common Stock 4,306 $ 0 0 D  
Class B Common Stock $ 0               (3)   (3) Class A Common Stock 50,000   50,000 I Class B by Spouse
Class B Common Stock $ 0               (3)   (3) Class A Common Stock 600,322   600,322 I By Trust

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Scott Jonathan R
PO BOX 30918
BILLINGS, MT 59116-0191
  X      

Signatures

 /S/ Kirk D. Jensen, Attorney-in-Fact for Reporting Person   05/08/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $41.05 to $41.175, inclusive. The reporting person undertakes to provide to the company, any security holder of the company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.
(2) The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder. The conversion feature of the Class B Common Stock does not expire and the reporting person elected to convert the shares upon receipt.
(3) The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder. The conversion feature of the Class B Common Stock does not expire.

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