On this page, we present all of the funds holding FIBK from our database of 13F filers, detailed in the table below. The first column indicates the name of each of the funds holding FIBK, with a link to that fund's top holdings. The next columns indicate the amount of FIBK stock held by each of the funds holding FIBK, followed by the FIBK position size held by the fund, and lastly the date of the quarterly filing period the data represents. In total, we count 203 funds holding FIBK within the last two filing periods in our coverage universe of 13F filers, with the largest position size having been reported by Vanguard Group Inc.. For more details on the positions held by Vanguard Group Inc. (or by any of the other funds holding FIBK), click the fund name in the "Holder" column of the funds-holding-FIBK table below.

Holder	Amount	Position Size ($ in 1000's)	As of
Vanguard Group Inc.	9,180,595	$282,303	12/31/2023
FIBK	9,180,595	$282,303	12/31/2023
BlackRock Inc.	8,267,067	$254,212	12/31/2023
FIBK	8,267,067	$254,212	12/31/2023
FMR LLC	6,605,393	$203,116	12/31/2023
FIBK	6,605,393	$203,116	12/31/2023
Franklin Resources Inc.	5,453,783	$167,704	12/31/2023
FIBK	5,453,783	$167,704	12/31/2023
First Interstate Bank	5,084,514	$156,349	12/31/2023
FIBK	5,084,514	$156,349	12/31/2023
Macquarie Group Ltd.	3,798,464	$116,815	12/31/2023
FIBK	3,798,464	$116,815	12/31/2023
Dimensional Fund Advisors LP	3,590,707	$110,418	12/31/2023
FIBK	3,590,707	$110,418	12/31/2023
JPMorgan Chase & Co.	3,356,151	$103,202	12/31/2023
FIBK	3,356,151	$103,202	12/31/2023
State Street Corp	3,340,027	$102,706	12/31/2023
FIBK	3,340,027	$102,706	12/31/2023
Wellington Management Group LLP	2,970,727	$91,350	12/31/2023
FIBK	2,970,727	$91,350	12/31/2023
American Century Companies Inc.	2,413,263	$74,208	12/31/2023
FIBK	2,413,263	$74,208	12/31/2023
Massachusetts Financial Services Co. MA	1,914,730	$58,878	12/31/2023
FIBK	1,914,730	$58,878	12/31/2023
Geode Capital Management LLC	1,877,027	$57,725	12/31/2023
FIBK	1,877,027	$57,725	12/31/2023
Millennium Management LLC	1,509,587	$46,420	12/31/2023
FIBK	1,509,587	$46,420	12/31/2023
Janus Henderson Group PLC	1,319,717	$40,581	12/31/2023
FIBK	1,319,717	$40,581	12/31/2023
Morgan Stanley	1,215,769	$37,385	12/31/2023
FIBK	1,215,769	$37,385	12/31/2023
Bank of New York Mellon Corp	1,209,970	$37,207	12/31/2023
FIBK	1,209,970	$37,207	12/31/2023
Bank of America Corp DE	1,104,088	$33,951	12/31/2023
FIBK	1,104,088	$33,951	12/31/2023
Charles Schwab Investment Management Inc.	931,047	$28,630	12/31/2023
FIBK	931,047	$28,630	12/31/2023
Standard Life Aberdeen plc	923,489	$28,397	12/31/2023
FIBK	923,489	$28,397	12/31/2023
Norges Bank	864,509	$26,584	12/31/2023
FIBK	864,509	$26,584	12/31/2023
Northern Trust Corp	854,512	$26,276	12/31/2023
FIBK	854,512	$26,276	12/31/2023
Jennison Associates LLC	776,333	$23,872	12/31/2023
FIBK	776,333	$23,872	12/31/2023
Bahl & Gaynor Inc.	697,916	$21,461	12/31/2023
FIBK	697,916	$21,461	12/31/2023
Nuveen Asset Management LLC	651,796	$20,043	12/31/2023
FIBK	651,796	$20,043	12/31/2023
Leeward Investments LLC MA	628,583	$19,329	12/31/2023
FIBK	628,583	$19,329	12/31/2023
Goldman Sachs Group Inc.	471,949	$14,512	12/31/2023
FIBK	471,949	$14,512	12/31/2023
Mesirow Institutional Investment Management Inc.	470,945	$14,482	12/31/2023
FIBK	470,945	$14,482	12/31/2023
Balyasny Asset Management LLC	439,332	$13,509	12/31/2023
FIBK	439,332	$13,509	12/31/2023
Davidson Investment Advisors	431,242	$13,261	12/31/2023
FIBK	431,242	$13,261	12/31/2023
Sei Investments Co.	423,606	$13,026	12/31/2023
FIBK	423,606	$13,026	12/31/2023
Empower Advisory Group LLC	412,901	$12,697	12/31/2023
FIBK	412,901	$12,697	12/31/2023
Invesco Ltd.	405,281	$12,462	12/31/2023
FIBK	405,281	$12,462	12/31/2023
First Trust Advisors LP	368,356	$11,327	12/31/2023
FIBK	368,356	$11,327	12/31/2023
Victory Capital Management Inc.	347,922	$10,699	12/31/2023
FIBK	347,922	$10,699	12/31/2023
Eagle Asset Management Inc.	341,304	$10,495	12/31/2023
FIBK	341,304	$10,495	12/31/2023
ProShare Advisors LLC	285,773	$8,788	12/31/2023
FIBK	285,773	$8,788	12/31/2023
Fisher Asset Management LLC	272,165	$8,369	12/31/2023
FIBK	272,165	$8,369	12/31/2023
The Manufacturers Life Insurance Company	255,165	$7,846	12/31/2023
FIBK	255,165	$7,846	12/31/2023
Mutual of America Capital Management LLC	253,522	$7,796	12/31/2023
FIBK	253,522	$7,796	12/31/2023
Peregrine Capital Management LLC	251,871	$7,745	12/31/2023
FIBK	251,871	$7,745	12/31/2023
Barclays PLC	242,501	$7,457	12/31/2023
FIBK	242,501	$7,457	12/31/2023
Forest Hill Capital LLC	217,141	$6,677	12/31/2023
FIBK	217,141	$6,677	12/31/2023
Hotchkis & Wiley Capital Management LLC	208,390	$6,408	12/31/2023
FIBK	208,390	$6,408	12/31/2023
Basswood Capital Management L.L.C.	199,020	$6,120	12/31/2023
FIBK	199,020	$6,120	12/31/2023
UBS Group AG	192,878	$5,931	12/31/2023
FIBK	192,878	$5,931	12/31/2023
Credit Suisse AG	184,480	$5,673	12/31/2023
FIBK	184,480	$5,673	12/31/2023
Swiss National Bank	175,946	$5,410	12/31/2023
FIBK	175,946	$5,410	12/31/2023
Alliancebernstein L.P.	174,410	$5,363	12/31/2023
FIBK	174,410	$5,363	12/31/2023
Cramer Rosenthal Mcglynn LLC	160,902	$4,948	12/31/2023
FIBK	160,902	$4,948	12/31/2023
Granite Investment Partners LLC	157,555	$4,845	12/31/2023
FIBK	157,555	$4,845	12/31/2023
Wells Fargo & Company MN	156,232	$4,804	12/31/2023
FIBK	156,232	$4,804	12/31/2023
Wedge Capital Management L L P NC	153,691	$4,726	12/31/2023
FIBK	153,691	$4,726	12/31/2023
Royal Bank of Canada	148,998	$4,582	12/31/2023
FIBK	148,998	$4,582	12/31/2023
Rafferty Asset Management LLC	146,191	$4,495	12/31/2023
FIBK	146,191	$4,495	12/31/2023
NFJ Investment Group LLC	143,962	$4,427	12/31/2023
FIBK	143,962	$4,427	12/31/2023
Heartland Advisors Inc.	143,450	$4,411	12/31/2023
FIBK	143,450	$4,411	12/31/2023
Rhumbline Advisers	138,668	$4,264	12/31/2023
FIBK	138,668	$4,264	12/31/2023
Cypress Capital Management LLC WY	131,802	$4,053	12/31/2023
FIBK	131,802	$4,053	12/31/2023
UBS Asset Management Americas Inc.	129,853	$3,993	12/31/2023
FIBK	129,853	$3,993	12/31/2023
Citigroup Inc.	129,673	$3,987	12/31/2023
FIBK	129,673	$3,987	12/31/2023
GW&K Investment Management LLC	126,360	$3,886	12/31/2023
FIBK	126,360	$3,886	12/31/2023
Susquehanna International Group LLP		$3,653	12/31/2023
FIBK	106,095	$3,262	12/31/2023
Call	12,700	$391	12/31/2023
Advisory Research Inc.	115,509	$3,552	12/31/2023
FIBK	115,509	$3,552	12/31/2023
Deutsche Bank AG	109,822	$3,377	12/31/2023
FIBK	109,822	$3,377	12/31/2023
Cladis Investment Advisory LLC	99,373	$3,056	12/31/2023
FIBK	99,373	$3,056	12/31/2023
State of New Jersey Common Pension Fund D	97,517	$2,999	12/31/2023
FIBK	97,517	$2,999	12/31/2023
California State Teachers Retirement System	93,086	$2,862	12/31/2023
FIBK	93,086	$2,862	12/31/2023
Legal & General Group Plc	88,765	$2,730	12/31/2023
FIBK	88,765	$2,730	12/31/2023
Stockman Wealth Management Inc.	95,714	$2,604	03/31/2024
FIBK	95,714	$2,604	03/31/2024
Jane Street Group LLC	83,881	$2,579	12/31/2023
FIBK	83,881	$2,579	12/31/2023
Stifel Financial Corp	82,363	$2,533	12/31/2023
FIBK	82,363	$2,533	12/31/2023
Neuberger Berman Group LLC	77,475	$2,382	12/31/2023
FIBK	77,475	$2,382	12/31/2023
Envestnet Asset Management Inc.	76,211	$2,343	12/31/2023
FIBK	76,211	$2,343	12/31/2023
Comerica Bank	73,854	$2,271	12/31/2023
FIBK	73,854	$2,271	12/31/2023
South Dakota Investment Council	68,244	$2,099	12/31/2023
FIBK	68,244	$2,099	12/31/2023
D.A. Davidson & CO.	67,237	$2,068	12/31/2023
FIBK	67,237	$2,068	12/31/2023
Northern Capital Management Inc.	57,237	$1,760	12/31/2023
FIBK	57,237	$1,760	12/31/2023
Prudential Financial Inc.	55,064	$1,693	12/31/2023
FIBK	55,064	$1,693	12/31/2023
Holocene Advisors LP	53,530	$1,646	12/31/2023
FIBK	53,530	$1,646	12/31/2023
Price T Rowe Associates Inc. MD	48,979	$1,507	12/31/2023
FIBK	48,979	$1,507	12/31/2023
Commonwealth Equity Services LLC	47,967	$1,475	12/31/2023
FIBK	47,967	$1,475	12/31/2023
Dakota Wealth Management	43,719	$1,344	12/31/2023
FIBK	43,719	$1,344	12/31/2023
MetLife Investment Management LLC	43,570	$1,340	12/31/2023
FIBK	43,570	$1,340	12/31/2023
Ameriprise Financial Inc.	42,511	$1,307	12/31/2023
FIBK	42,511	$1,307	12/31/2023
Mirae Asset Global Investments Co. Ltd.	42,437	$1,305	12/31/2023
FIBK	42,437	$1,305	12/31/2023
American International Group Inc.	41,097	$1,264	12/31/2023
FIBK	41,097	$1,264	12/31/2023
Advisors Asset Management Inc.	38,515	$1,184	12/31/2023
FIBK	38,515	$1,184	12/31/2023
Ensign Peak Advisors Inc	37,100	$1,141	12/31/2023
FIBK	37,100	$1,141	12/31/2023
Russell Investments Group Ltd.	34,550	$1,062	12/31/2023
FIBK	34,550	$1,062	12/31/2023
New York State Common Retirement Fund	33,694	$1,036	12/31/2023
FIBK	33,694	$1,036	12/31/2023
Voya Investment Management LLC	33,235	$1,022	12/31/2023
FIBK	33,235	$1,022	12/31/2023
Cullen Capital Management LLC	32,379	$996	12/31/2023
FIBK	32,379	$996	12/31/2023
Tower Research Capital LLC TRC	29,376	$903	12/31/2023
FIBK	29,376	$903	12/31/2023
Hsbc Holdings PLC	27,868	$860	12/31/2023
FIBK	27,868	$860	12/31/2023
LPL Financial LLC	26,955	$829	12/31/2023
FIBK	26,955	$829	12/31/2023
Arizona State Retirement System	24,954	$767	12/31/2023
FIBK	24,954	$767	12/31/2023
CAPROCK Group Inc.	24,814	$763	12/31/2023
FIBK	24,814	$763	12/31/2023
State Board of Administration of Florida Retirement System	23,600	$726	12/31/2023
FIBK	23,600	$726	12/31/2023
TNF LLC	24,584	$723	12/31/2023
FIBK	24,584	$723	12/31/2023
BNP Paribas Arbitrage SA	23,338	$718	12/31/2023
FIBK	23,338	$718	12/31/2023
Evergreen Capital Management LLC	22,293	$686	12/31/2023
FIBK	22,293	$686	12/31/2023
Handelsbanken Fonder AB	20,453	$629	12/31/2023
FIBK	20,453	$629	12/31/2023
Zurcher Kantonalbank Zurich Cantonalbank	20,099	$618	12/31/2023
FIBK	20,099	$618	12/31/2023
Strs Ohio	19,900	$611	12/31/2023
FIBK	19,900	$611	12/31/2023
Raymond James & Associates	18,538	$570	12/31/2023
FIBK	18,538	$570	12/31/2023
Mercer Global Advisors Inc. ADV	17,942	$552	12/31/2023
FIBK	17,942	$552	12/31/2023
Qube Research & Technologies Ltd	17,770	$546	12/31/2023
FIBK	17,770	$546	12/31/2023
Advantage Alpha Capital Partners LP	17,054	$524	12/31/2023
FIBK	17,054	$524	12/31/2023
Pathstone Holdings LLC	16,959	$521	12/31/2023
FIBK	16,959	$521	12/31/2023
State of Wisconsin Investment Board	16,567	$509	12/31/2023
FIBK	16,567	$509	12/31/2023
HighTower Advisors LLC	15,867	$487	12/31/2023
FIBK	15,867	$487	12/31/2023
Creative Planning	15,567	$479	12/31/2023
FIBK	15,567	$479	12/31/2023
Public Employees Retirement Association of Colorado	14,953	$460	12/31/2023
FIBK	14,953	$460	12/31/2023
Baird Financial Group Inc.	14,575	$448	12/31/2023
FIBK	14,575	$448	12/31/2023
Keeley Teton Advisors LLC	14,100	$434	12/31/2023
FIBK	14,100	$434	12/31/2023
Mariner LLC	13,974	$430	12/31/2023
FIBK	13,974	$430	12/31/2023
WBI Investments	13,940	$429	12/31/2023
FIBK	13,940	$429	12/31/2023
Cambridge Investment Research Advisors Inc.	13,909	$428	12/31/2023
FIBK	13,909	$428	12/31/2023
Y Intercept Hong Kong Ltd	13,842	$426	12/31/2023
FIBK	13,842	$426	12/31/2023
US Bancorp DE	13,270	$408	12/31/2023
FIBK	13,270	$408	12/31/2023
Picton Mahoney Asset Management	13,048	$402	12/31/2023
FIBK	13,048	$402	12/31/2023
Advisor Group Holdings Inc.	12,611	$388	12/31/2023
FIBK	12,611	$388	12/31/2023
CWM Advisors LLC	12,487	$384	12/31/2023
FIBK	12,487	$384	12/31/2023
Great West Life Assurance Co. Can	11,987	$367	12/31/2023
FIBK	11,987	$367	12/31/2023
Squarepoint Ops LLC	11,917	$366	12/31/2023
FIBK	11,917	$366	12/31/2023
NJ State Employees Deferred Compensation Plan	11,795	$363	12/31/2023
FIBK	11,795	$363	12/31/2023
Legacy Wealth Asset Management LLC	11,327	$348	12/31/2023
FIBK	11,327	$348	12/31/2023
Honkamp Krueger Financial Services Inc.	11,290	$347	12/31/2023
FIBK	11,290	$347	12/31/2023
Elequin Capital LP	11,102	$341	12/31/2023
FIBK	11,102	$341	12/31/2023
Pictet Asset Management Holding SA	10,679	$328	12/31/2023
FIBK	10,679	$328	12/31/2023
Naples Global Advisors LLC	10,500	$323	12/31/2023
FIBK	10,500	$323	12/31/2023
Principal Financial Group Inc.	10,411	$320	12/31/2023
FIBK	10,411	$320	12/31/2023
Truist Financial Corp	10,038	$309	12/31/2023
FIBK	10,038	$309	12/31/2023
TFO TDC LLC	9,679	$298	12/31/2023
FIBK	9,679	$298	12/31/2023
Curran Financial Partners LLC	10,000	$291	12/31/2023
FIBK	10,000	$291	12/31/2023
Wrapmanager Inc.	9,336	$287	12/31/2023
FIBK	9,336	$287	12/31/2023
Wealth Enhancement Advisory Services LLC	10,459	$285	03/31/2024
FIBK	10,459	$285	03/31/2024
JGP Wealth Management LLC	9,176	$282	12/31/2023
FIBK	9,176	$282	12/31/2023
Allied Investment Advisors LLC	10,210	$278	03/31/2024
FIBK	10,210	$278	03/31/2024
Dark Forest Capital Management LP	8,648	$266	12/31/2023
FIBK	8,648	$266	12/31/2023
Sierra Summit Advisors LLC	8,654	$266	12/31/2023
FIBK	8,654	$266	12/31/2023
Altus Wealth Group LLC	8,622	$265	12/31/2023
FIBK	8,622	$265	12/31/2023
Ameritas Investment Partners Inc.	8,559	$263	12/31/2023
FIBK	8,559	$263	12/31/2023
Citadel Advisors LLC		$255	12/31/2023
Call	6,800	$209	12/31/2023
FIBK	2,196	$68	12/31/2023
Put	700	$22	12/31/2023
Arden Trust Co	8,796	$239	03/31/2024
FIBK	8,796	$239	03/31/2024
Amalgamated Bank	7,352	$226	12/31/2023
FIBK	7,352	$226	12/31/2023
Washington Trust Bank	7,330	$225	12/31/2023
FIBK	7,330	$225	12/31/2023
Teacher Retirement System of Texas	6,918	$213	12/31/2023
FIBK	6,918	$213	12/31/2023
FourThought Financial Partners LLC	6,774	$208	12/31/2023
FIBK	6,774	$208	12/31/2023
Telos Capital Management Inc.	6,675	$205	12/31/2023
FIBK	6,675	$205	12/31/2023
Group One Trading L.P.		$200	12/31/2023
Call	6,500	$200	12/31/2023
Signaturefd LLC	6,208	$191	12/31/2023
FIBK	6,208	$191	12/31/2023
West Financial Advisors LLC	6,332	$172	03/31/2024
FIBK	6,332	$172	03/31/2024
Covestor Ltd	5,478	$168	12/31/2023
FIBK	5,478	$168	12/31/2023
ICA Group Wealth Management LLC	5,345	$164	12/31/2023
FIBK	5,345	$164	12/31/2023
Nisa Investment Advisors LLC	4,870	$150	12/31/2023
FIBK	4,870	$150	12/31/2023
Metropolitan Life Insurance Co NY	4,808	$148	12/31/2023
FIBK	4,808	$148	12/31/2023
Bessemer Group Inc.	4,405	$135	12/31/2023
FIBK	4,405	$135	12/31/2023
Quadrant Capital Group LLC	3,755	$115	12/31/2023
FIBK	3,755	$115	12/31/2023
The PNC Financial Services Group Inc.	3,378	$104	12/31/2023
FIBK	3,378	$104	12/31/2023
CWM LLC	2,693	$73	03/31/2024
FIBK	2,693	$73	03/31/2024
Clear Street Markets LLC	2,314	$71	12/31/2023
FIBK	2,314	$71	12/31/2023
Northwestern Mutual Wealth Management Co.	2,130	$65	12/31/2023
FIBK	2,130	$65	12/31/2023
Fifth Third Bancorp	1,500	$46	12/31/2023
FIBK	1,500	$46	12/31/2023
Wolverine Asset Management LLC	1,257	$39	12/31/2023
FIBK	1,257	$39	12/31/2023
Parallel Advisors LLC	1,273	$39	12/31/2023
FIBK	1,273	$39	12/31/2023
Public Employees Retirement System of Ohio	1,148	$35	12/31/2023
FIBK	1,148	$35	12/31/2023
Lindbrook Capital LLC	1,135	$35	12/31/2023
FIBK	1,135	$35	12/31/2023
PrairieView Partners LLC	1,100	$34	12/31/2023
FIBK	1,100	$34	12/31/2023
Ronald Blue Trust Inc.	870	$27	12/31/2023
FIBK	870	$27	12/31/2023
Global Retirement Partners LLC	929	$26	12/31/2023
FIBK	929	$26	12/31/2023
Allworth Financial LP	814	$25	12/31/2023
FIBK	814	$25	12/31/2023
First PREMIER Bank	842	$23	03/31/2024
FIBK	842	$23	03/31/2024
Nomura Asset Management Co. Ltd.	490	$15	12/31/2023
FIBK	490	$15	12/31/2023
Hexagon Capital Partners LLC	448	$12	03/31/2024
FIBK	448	$12	03/31/2024
Aquatic Capital Management LLC	400	$12	12/31/2023
FIBK	400	$12	12/31/2023
Versant Capital Management Inc	335	$9	03/31/2024
FIBK	335	$9	03/31/2024
Global Wealth Strategies & Associates	240	$7	03/31/2024
FIBK	240	$7	03/31/2024
EverSource Wealth Advisors LLC	240	$7	12/31/2023
FIBK	240	$7	12/31/2023
GAMMA Investing LLC	195	$5	03/31/2024
FIBK	195	$5	03/31/2024
Caitlin John LLC	150	$5	12/31/2023
FIBK	150	$5	12/31/2023
UMB Bank N A MO	141	$4	12/31/2023
FIBK	141	$4	12/31/2023
Farther Finance Advisors LLC	118	$4	12/31/2023
FIBK	118	$4	12/31/2023
Clearstead Advisors LLC	100	$3	12/31/2023
FIBK	100	$3	12/31/2023
Oakworth Capital Inc.	82	$3	12/31/2023
FIBK	82	$3	12/31/2023
Financial Perspectives Inc	100	$3	12/31/2023
FIBK	100	$3	12/31/2023
Johnson Financial Group Inc.	74	$2	12/31/2023
FIBK	74	$2	12/31/2023
AdvisorNet Financial Inc	32	$1	03/31/2024
FIBK	32	$1	03/31/2024
SJS Investment Consulting Inc.	21	$1	03/31/2024
FIBK	21	$1	03/31/2024
Resources Management Corp CT ADV	31	$1	12/31/2023
FIBK	31	$1	12/31/2023
Proequities Inc.		$1	12/31/2023
FIBK	18	$1	12/31/2023
Put	0	$0	12/31/2023
Call	0	$0	12/31/2023
Toronto Dominion Bank	20	$1	12/31/2023
FIBK	20	$1	12/31/2023
JFS Wealth Advisors LLC	17	$1	12/31/2023
FIBK	17	$1	12/31/2023
Glassman Wealth Services	30	$1	12/31/2023
FIBK	30	$1	12/31/2023
Bell Investment Advisors Inc	23	$1	12/31/2023
FIBK	23	$1	12/31/2023
Private Wealth Management Group LLC	31	$1	12/31/2023
FIBK	31	$1	12/31/2023
Massmutual Trust Co. FSB ADV	8	$0	03/31/2024
FIBK	8	$0	03/31/2024
Principal Securities Inc.	16	$0	12/31/2023
FIBK	16	$0	12/31/2023
Huntington National Bank	1	$0	12/31/2023
FIBK	1	$0	12/31/2023
Crewe Advisors LLC	5	$0	12/31/2023
FIBK	5	$0	12/31/2023
Newbridge Financial Services Group Inc.	1	$0	12/31/2023
FIBK	1	$0	12/31/2023
DiNuzzo Private Wealth Inc.	10	$0	12/31/2023
FIBK	10	$0	12/31/2023
Foster Dykema Cabot & Partners LLC	6	$0	12/31/2023
FIBK	6	$0	12/31/2023