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
OMB APPROVAL
OMB Number: 3235-0287
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
HEYNEMAN JOHN M JR
  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 __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
4100 BIGHORN AVE
3. Date of Earliest Transaction (Month/Day/Year)
08/24/2016
(Street)

SHERIDAN, WY 82801
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 08/24/2016   M   1,972 A $ 15.91 3,621 D  
Class A Common Stock 08/24/2016   M   3,094 A $ 13.25 6,715 D  
Class A Common Stock 08/24/2016   F   2,405 D $ 30.09 4,310 D  
Class A Common Stock 09/08/2016   M   5,801 A $ 13.6 10,111 D  
Class A Common Stock 09/08/2016   F   2,540 D $ 31.05 7,571 D  
Class A Common Stock 11/03/2016   M   4,428 A $ 20.82 11,999 D  
Class A Common Stock 11/03/2016   F   2,959 D $ 31.15 9,040 D  
Class A Common Stock 11/25/2016   S   2,000 D $ 37.35 (1) 7,040 D  
Class A Common Stock 12/12/2016   S   1,000 D $ 41.87 6,040 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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. SEC 1474 (9-02)

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) $ 15.91 08/24/2016   M     1,972 05/07/2010 05/07/2020 Class A Common Stock 1,972 $ 0 0 D  
Stock Options (Right to Buy) $ 13.25 08/24/2016   M     3,094 05/24/2011 05/24/2021 Class A Common Stock 3,094 $ 0 0 D  
Stock Options (Right to Buy) $ 13.6 09/08/2016   M     5,801 05/23/2012 05/23/2022 Class A Common Stock 5,801 $ 0 0 D  
Stock Options (Right to Buy) $ 20.82 11/03/2016   M     4,428 05/22/2013 05/22/2013 Class A Common Stock 4,428 $ 0 0 D  
Class B Common Stock (2) $ 0 12/15/2016   G   16,737     (2)   (2) Class A Common Stock 16,737 $ 0 139,921 I By Trust
Class B Common Stock (2) $ 0               (2)   (2) Class A Common Stock 15,000   15,000 D  
Class B Common Stock (2) $ 0               (2)   (2) Class A Common Stock 3,232   3,232 I By Spouse
Class B Common Stock (2) $ 0               (2)   (2) Class A Common Stock 1,085,792   1,085,792 I By Limited Partnership

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
HEYNEMAN JOHN M JR
4100 BIGHORN AVE
SHERIDAN, WY 82801
  X   X    

Signatures

 /S/ Kirk D. Jensen, Attorney-in-Fact for Reporting Person   05/24/2018
**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 $37.29 to $37.47 The reporting person undertakes to provide to First Interstate BancSystem, Inc., any security holder of First Interstate BancSystem, Inc., or the staff of the Securities and Exchange Commission, upon, request, the full information regarding the number of shares sold at each separate price within the ranges 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.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

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