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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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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