Company · Ownership research

FIRST INTERSTATE BANCSYSTEM INC FIBK

CIK 0000860413

Form 4 transactions dated Sep 1, 2023 to Sep 25, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 42 rows; the complete set is available through the API.

Insider filings on file run through 2026-07-28.

Some filings are submitted jointly by several insiders. The SEC form does not apportion the reported figures between them, so results include every joint filer.

Insider purchases & sales

Purchased: $347.72K
Sold: $65.06M

Sep 1, 2023 – Jul 28, 2026
Available records · partial months are marked ·

Insiders in this window

202510 of 17 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
2025-12-01	Susan Scott Heyneman Trust, Susan Heyneman & First Interstate Wealth Management Co-Trustees 10% owner	Sale	$327.50K 10,000 shares sold	4.27% sold Indirect holding	▾
2025-11-21	HEYNEMAN JOHN M JR · Riki Rae Scott Davidson & John Heyneman Jr., Trustees FBO Riki Scott Davidson Exemption Trust Under the Scott Family 1996 Trust · Towanda Investments Limited Partnership · John M Heyneman Jr. Trust · Rae Ann Morss & John Heyneman Jr., Trustees FBO Rae Ann Morss Exemption Trust Under the Scott Family 1996 Trust Director · 10% owner	Sale	$944.30K 30,432 shares sold	Unavailable Indirect holding	▾
2025-11-11	HEYNEMAN JOHN M JR Director · 10% owner	Sale	$482.10K 15,000 shares sold	33.22% sold LLC holding	▾
2025-11-10	HEYNEMAN JOHN M JR Director · 10% owner	Sale	$641.20K 20,000 shares sold	29.64% sold LLC holding	▾
2025-11-03	Scott Jonathan R · Harrison William Scott Trust · Harper Grace Scott Trust · Holland Elizabeth Scott Trust · Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04 · IXL Ltd Liability Co 10% owner	Sale	$150.10K 4,800 shares sold	Unavailable Indirect holding	▾
2025-11-03	Susan Scott Heyneman Trust, Susan Heyneman & First Interstate Wealth Management Co-Trustees 10% owner	Sale	$309.90K 10,000 shares sold	4.09% sold Indirect holding	▾
2025-10-29	Scott Jonathan R · Harrison William Scott Trust · Harper Grace Scott Trust · Holland Elizabeth Scott Trust · Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04 · IXL Ltd Liability Co 10% owner	Sale	$224.63K 7,000 shares sold	Unavailable Indirect holding	▾
2025-10-09	Scott Jonathan R · Harrison William Scott Trust · Harper Grace Scott Trust · Holland Elizabeth Scott Trust · Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04 · IXL Ltd Liability Co 10% owner	Sale	$21.69K 685 shares sold	Unavailable Indirect holding	▾
2025-10-08	Scott Jonathan R · Harrison William Scott Trust · Harper Grace Scott Trust · Holland Elizabeth Scott Trust · Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04 · IXL Ltd Liability Co 10% owner	Sale	$179.26K 5,600 shares sold	Unavailable Indirect holding	▾
2025-10-07	Scott Jonathan R · Harrison William Scott Trust · Harper Grace Scott Trust · Holland Elizabeth Scott Trust · Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04 · IXL Ltd Liability Co 10% owner	Sale	$440.11K 13,715 shares sold	Unavailable Indirect holding	▾

Showing 17 / 17 record groups in 2025. The complete set is available through the API.

FIRST INTERSTATE BANCSYSTEM INC · FIBK

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The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 17 of 17 purchase / sale groups and 30 of 42 other groups; the totals and the monthly series cover the whole window.

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{"ticker":"FIBK","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.