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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 1)*

Dynamex Inc.
(Name of Issuer)
Common Stock, $.01 Par Value
(Title of Class of Securities)
26784f103
(CUSIP Number)
December 31, 2005
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

     o Rule 13d-1(b)

     þ Rule 13d-1(c)

     o Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

 
 

 

                     
CUSIP No.
  
26784f103 
   Page  
2 
   of   
5 Pages 

 

           
1   NAMES OF REPORTING PERSONS:
Thomas F. Frist III
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
   
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   o
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  United States of America
       
  5   SOLE VOTING POWER:
     
NUMBER OF   1,100,000
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   0
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   1,100,000
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    0
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  1,100,000
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  9.9%
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  IN

 

                     
CUSIP No.
  
26784f103 
   Page  
3 
   of   
5 Pages 
         
Item 1(a).
  Name of Issuer:   Dynamex Inc.
Item 1(b).
  Address of Issuer’s   1870 Crown Drive
 
  Principal Executive   Dallas, TX 75234
 
  Offices:    
Item 2(a).
  Name of Person Filing:   See Item 1 of page 2
Item 2(b).
  Address of Principal   3100 West End Avenue, Suite 500
 
  Business Office or, if none, Residence:   Nashville, TN 37203
Item 2(c).
  Organization/Citizenship:   See Item 4 of page 2
Item 2(d).
  Title of Class   common stock, $.01 par value
 
  Of Securities:    
Item 2(e).
  CUSIP Number:   26784f103
Item 3.
  Inapplicable.    
Item 4.
  Ownership.    
                                                 
    Total                                
    Shares                                
    of                                
    Common                           Sole   Shared
    Stock   Percent   Sole   Shared   Power   Power
    Beneficially   of   Voting   Voting   to   to
Person   Owned(1)   Class(2)   Power   Power   Dispose   Dispose
Thomas F. Frist III
     1,100,000       9.9 %     1,100,000       0       1,100,000       0  
 
(1)   Includes shares purchased by Mr. Frist through March 3, 2006.
 
(2)   Based on 11,109,797 shares of Common Stock outstanding as of November 28, 2005 as reported on the Company’s quarterly report on Form 10-Q for the quarter ended October 31, 2005 filed with the Commission on December 12, 2005.

 

 

                     
CUSIP No.
  
26784f103 
   Page  
4 
   of   
5 Pages 
Item 5. Ownership of Five Percent or Less of a Class.
     Inapplicable
Item 6. Ownership of More than Five Percent on Behalf of Another Person.
     Inapplicable
Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company.
     Inapplicable
Item 8. Identification and Classification of Members of the Group.
     Inapplicable
Item 9. Notice of Dissolution of Group.
     Inapplicable
Item 10. Certification.
     By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

 

 

                     
CUSIP No.
  
26784f103 
   Page  
5 
   of   
5 Pages 
SIGNATURE
     After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
         
     
  March 3, 2006  
  Date   
     
 
         
     
  /s/ Thomas F. Frist III    
  (Signature)   
     
 
         
     
  Thomas F. Frist III    
  (Name/Title)