First Interstate BancSystem, Inc.
US ˙ NasdaqGS ˙ US32055Y2019

SecurityFIBK / First Interstate BancSystem, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership155,862 shares
Latest Disclosed Value $ 5,205,791
Citigroup Inc reports 0.95% increase in ownership of FIBK / First Interstate BancSystem, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 155,862 shares of First Interstate BancSystem, Inc. (US:FIBK) valued at $5,205,791 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 154,397 shares of First Interstate BancSystem, Inc.. This represents a change in shares of 0.95% during the quarter. The current value of the position is $5,349,184 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-11 2026-03-31 13F FIRST INTST BANCSYSTEM COM 32055Y201 155,862 1,465 0.95 5,206 -2.56 0.0011
2026-02-13 2025-12-31 13F FIRST INTST BANCSYSTEM COM 32055Y201 154,397 3,904 2.59 5,342 11.38 0.0024
2025-11-10 2025-09-30 13F FIRST INTST BANCSYSTEM COM 32055Y201 150,493 -24,466 -13.98 4,796 -4.88 0.0021
2025-08-11 2025-06-30 13F FIRST INTST BANCSYSTEM COM 32055Y201 174,959 -1,186 -0.67 5,042 -0.08 0.0025
2025-05-12 2025-03-31 13F FIRST INTST BANCSYSTEM COM 32055Y201 176,145 -16,941 -8.77 5,047 -19.51 0.0026
2025-02-12 2024-12-31 13F FIRST INTST BANCSYSTEM COM 32055Y201 193,086 13,983 7.81 6,270 14.11 0.0037
2024-11-12 2024-09-30 13F FIRST INTST BANCSYSTEM COM 32055Y201 179,103 -5,934 -3.21 5,495 6.93 0.0032
2024-08-12 2024-06-30 13F FIRST INTST BANCSYSTEM COM 32055Y201 185,037 -9,225 -4.75 5,138 -2.78 0.0033
2024-05-10 2024-03-31 13F FIRST INTST BANCSYSTEM COM 32055Y201 194,262 64,589 49.81 5,286 32.56 0.0035
2024-02-09 2023-12-31 13F FIRST INTST BANCSYSTEM COM 32055Y201 129,673 53,044 69.22 3,987 108.63 0.0028
2023-12-06 2023-09-30 13F/A-1 FIRST INTST BANCSYSTEM COM 32055Y201 76,629 -48,875 -38.94 1,911 -36.13 0.0014
2023-11-09 2023-09-30 13F FIRST INTST BANCSYSTEM COM 32055Y201 76,629 -48,875 1,911 0.0006
2023-08-10 2023-06-30 13F FIRST INTST BANCSYSTEM COM 32055Y201 125,504 115,035 1,098.82 2,992 858.97 0.0020
2023-05-11 2023-03-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 10,469 5,375 105.52 313 59.18 0.0002
2023-02-09 2022-12-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 5,094 -2,317 -31.26 197 -34.45 0.0002
2022-11-10 2022-09-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 7,411 -4,118 -35.72 299 -31.89 0.0002
2022-08-10 2022-06-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 11,529 1,936 20.18 439 24.72 0.0003
2022-05-12 2022-03-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 9,593 -12,251 -56.08 352 -60.36 0.0002
2022-02-10 2021-12-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 21,844 15,343 236.01 888 238.93 0.0005
2021-11-10 2021-09-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 6,501 -17,274 -72.66 262 -73.67 0.0002
2021-08-10 2021-06-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 23,775 -3,861 -13.97 995 -21.84 0.0006
2021-05-13 2021-03-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 27,636 15,432 126.45 1,273 156.14 0.0008
2021-02-11 2020-12-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 12,204 6,347 108.37 497 165.78 0.0003
2020-11-12 2020-09-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 5,857 -12,041 -67.28 187 -66.25 0.0001
2020-08-12 2020-06-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 17,898 601 3.47 554 11.02 0.0004
2020-05-12 2020-03-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 17,297 -23,337 -57.43 499 -70.70 0.0005
2020-02-12 2019-12-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 40,634 27,073 199.64 1,703 212.48 0.0012
2019-11-08 2019-09-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 13,561 -12,485 -47.93 545 -47.19 0.0004
2019-08-12 2019-06-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 26,046 5,354 25.87 1,032 25.24 0.0008
2019-05-13 2019-03-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 20,692 -9,074 -30.48 824 -24.33 0.0008
2019-02-12 2018-12-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 29,766 16,306 121.14 1,089 80.60 0.0011
2018-11-13 2018-09-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 13,460 1,661 14.08 603 21.08 0.0005
2018-08-10 2018-06-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 11,799 -8,060 -40.59 498 -36.48 0.0005
2018-05-11 2018-03-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 19,859 5,789 41.14 784 39.01 0.0006
2018-02-12 2017-12-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 14,070 -645 -4.38 564 0.36 0.0005
2017-11-13 2017-09-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 14,715 3,519 31.43 562 34.77 0.0005
2017-08-11 2017-06-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 11,196 2,532 29.22 417 21.22 0.0004
2017-05-12 2017-03-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 8,664 -26,218 -75.16 344 -76.84 0.0003
2017-02-10 2016-12-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 34,882 23,207 198.78 1,485 303.53 0.0013
2016-11-10 2016-09-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 11,675 357 3.15 368 16.09 0.0003
2016-08-12 2016-06-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 11,318 -15,824 -58.30 317 -58.51 0.0003
2016-05-13 2016-03-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 27,142 3,624 15.41 764 11.70 0.0009
2016-02-12 2015-12-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 23,518 -2,406 -9.28 684 -5.26 0.0007
2015-11-13 2015-09-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 25,924 8,691 50.43 722 51.05 0.0007
2015-08-13 2015-06-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 17,233 3,624 26.63 478 26.12 0.0004
2015-05-14 2015-03-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 13,609 -2,541 -15.73 379 -15.59 0.0004
2015-02-17 2014-12-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 16,150 1,983 14.00 449 19.41 0.0004
2014-11-14 2014-09-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 14,167 12,998 1,111.89 376 1,075.00 0.0003
2014-08-14 2014-06-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 1,169 -6,691 -85.13 32 -85.59 0.0000
2014-05-15 2014-03-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 7,860 -7,250 -47.98 222 -48.25 0.0002
2014-02-14 2013-12-31 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 15,110 9,772 183.06 429 232.56 0.0004
2013-11-14 2013-09-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 5,338 -4,418 -45.28 129 -36.14 0.0001
2013-08-14 2013-06-30 13F FIRST INTST BANCSYSTEM COM CL A 32055Y201 9,756 9,756 202 0.0002
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.