As of November 6, 2026, 5 holders' latest Schedule 13D or 13G filings report owning 5% or more of First Interstate Bancsystem Inc. The largest reported stake is BlackRock, Inc.'s, at 12.9%. 12 filings are on record since July 15, 2025 (Schedule 13G/A, January 8, 2026).
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Key facts
- · Reporting person: State Street Corporation · Sole voting: 0 · Shared voting: 696,148 · Sole dispositive: 0 · Shared dispositive: 6,250,817 · SCHEDULE 13G, 2026-08-07
- · Reporting person: Wellington Management Group LLP · Sole voting: 0 · Shared voting: 2,347,013 · Sole dispositive: 0 · Shared dispositive: 3,882,437 · SCHEDULE 13G/A, 2026-05-15
- · Reporting person: Vanguard Portfolio Management · Sole voting: 33,164 · Shared voting: 0 · Sole dispositive: 5,523,702 · Shared dispositive: 0 · SCHEDULE 13G, 2026-04-29
- · Reporting person: The Vanguard Group · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-03-26
- · Holder: The Vanguard Group · Percent: 10% · SCHEDULE 13G/A
First Interstate Bancsystem Inc has 12 Schedule 13D or 13G filings on record since 2025-07-15. 5 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| BlackRock, Inc. | 12.9% | 13,290,004 | SCHEDULE 13G/A, 2026-01-08 | 2025-12-31 |
| State Street Corporation | 6.4% | 6,250,817 | SCHEDULE 13G, 2026-08-07 | 2026-06-30 |
| Vanguard Portfolio Management | 5.46% | 5,523,702 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| Dimensional Fund Advisors LP | 5.2% | 5,416,568 | SCHEDULE 13G, 2025-07-15 | 2025-06-30 |
| Fmr LLC | 5% | 5,210,136 | SCHEDULE 13G/A, 2025-08-06 | 2025-06-30 |
| Franklin Mutual Advisers, LLC | 4% | 4,222,302 | SCHEDULE 13G/A, 2025-11-04 | 2025-09-30 |
| Wellington Management Group LLP | 4% | 3,882,437 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
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More on First Interstate Bancsystem Inc and the records around it.
First Interstate Bancsystem Inc elsewhere on the record
- Leadership changes Sep 2026
- Who owns it
Companies that share a holder
- Franklin Mutual Advisers, LLC also filed stake reports on 14 other companies: BENCHMARK ELECTRONICS INC (Apr 2026), Ryerson Holding Corp (Apr 2026), Select Water Solutions, Inc. (Apr 2026)
- Wellington Management Group LLP also filed stake reports on 240 other companies: Hub Group, Inc. (Oct 2026), Latham Group, Inc. (Oct 2026), Redwood Trust, Inc. (Oct 2026)
- STATE STREET CORPORATION also filed stake reports on 343 other companies: TRADE DESK INC/THE (Oct 2026), CENTRUS ENERGY CORP (Sep 2026), ACADIA PHARMACEUTICALS INC (Aug 2026)
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What the Full Report on First Interstate Bancsystem Inc covers
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| State Street Corporation | 0 | 696,148 | 0 | 6,250,817 | SCHEDULE 13G, 2026-08-07 |
| Vanguard Portfolio Management | 33,164 | 0 | 5,523,702 | 0 | SCHEDULE 13G, 2026-04-29 |
| Wellington Management Group LLP | 0 | 2,347,013 | 0 | 3,882,437 | SCHEDULE 13G/A, 2026-05-15 |
| Wellington Group Holdings LLP | 0 | 2,347,013 | 0 | 3,882,437 | SCHEDULE 13G/A, 2026-05-15 |
| Wellington Investment Advisors Holdings LLP | 0 | 2,347,013 | 0 | 3,882,437 | SCHEDULE 13G/A, 2026-05-15 |
| The Vanguard Group | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-03-26 |
The latest filing identifies First Interstate Bancsystem Inc by CUSIP 32055Y201 and gives its principal executive office as PO BOX 30918 401 NORTH 31ST STREET, BILLINGS, MT 59107 (SCHEDULE 13G, 2026-08-07).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-15 | Dimensional Fund Advisors LP | 5.2% | SCHEDULE 13G |
| 2025-08-06 | Fmr LLC | 5% | SCHEDULE 13G/A |
| 2025-11-04 | Franklin Mutual Advisers, LLC | 4% | SCHEDULE 13G/A |
| 2025-11-12 | Wellington Management Group LLP | 5.6% | SCHEDULE 13G |
| 2026-01-08 | BlackRock, Inc. | 12.9% | SCHEDULE 13G/A |
| 2026-01-30 | The Vanguard Group | 9.76% | SCHEDULE 13G/A |
| 2026-02-09 | State Street Corporation | 5.3% | SCHEDULE 13G |
| 2026-03-05 | The Vanguard Group | 10% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Portfolio Management | 5.46% | SCHEDULE 13G |
| 2026-05-15 | Wellington Management Group LLP | 4% | SCHEDULE 13G/A |
| 2026-08-07 | State Street Corporation | 6.4% | SCHEDULE 13G |
Questions about who owns First Interstate Bancsystem Inc
Who owns First Interstate Bancsystem Inc?
On this page, 5 holders' latest ownership filings report 5% or more of First Interstate Bancsystem Inc: BlackRock, Inc. (12.9%, Schedule 13G/A, filed 2026-01-08), State Street Corporation (6.4%, Schedule 13G, filed 2026-08-07), Vanguard Portfolio Management (5.46%, Schedule 13G, filed 2026-04-29), Dimensional Fund Advisors LP (5.2%, Schedule 13G, filed 2025-07-15) and Fmr LLC (5%, Schedule 13G/A, filed 2025-08-06).
Who are the largest shareholders of First Interstate Bancsystem Inc?
By the share each holder's latest filing reports, the largest holders of First Interstate Bancsystem Inc on this page are BlackRock, Inc. (12.9%), State Street Corporation (6.4%) and Vanguard Portfolio Management (5.46%).
When did BlackRock, Inc. buy into First Interstate Bancsystem Inc?
The filings give report dates, not purchase dates. The earliest filing from BlackRock, Inc. on this page is the Schedule 13G/A, filed 2026-01-08, reporting 12.9%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 12 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for First Interstate Bancsystem Inc
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| September 16, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| August 21, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| July 16, 2026 | Leadership change: Matthew Ritter appointed, Director, and 1 more | — | Leadership changes | Source |
| July 9, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| May 29, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| May 13, 2026 | Leadership change: Kristina Robbins departs, Chief Executive Officer | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.