Company · FIBK · CIK 860413

First Interstate Bancsystem Inc (FIBK) SEC filings and CIK.

FIBK’s SEC Central Index Key (CIK) is 0000860413, or 860413 without leading zeros. The SEC’s ticker file lists it as FIRST INTERSTATE BANCSYSTEM INC.

Ticker: FIBK
CIK: 0000860413
Other tickers: None
Insider transactions, Q3 2026: 9

Insider trading

In Q3 2026, insiders at First Interstate Bancsystem Inc reported 9 non-derivative transactions on 12 Forms 3, 4 and 5, including 0 open-market purchases and 4 sales. See every FIBK insider transaction →

Recent filings we observed

From our record of EDGAR’s latest-filings feed and sampled daily indexes. Not a complete filing history; use the filings API for that.
Filed	Form	Accession
2026-10-30	144	0001959173-26-007574

Get FIBK SEC data through the API

Filing history

curl "https://sec-api.dev/api/v1/filings?cik=860413&limit=10" \
  -H "Authorization: Bearer $SEC_API_KEY"

Company profile

curl "https://sec-api.dev/api/v1/companies/860413" \
  -H "Authorization: Bearer $SEC_API_KEY"

Reported XBRL facts

curl "https://sec-api.dev/api/v1/facts/860413?taxonomy=us-gaap&concept=Revenues&limit=10" \
  -H "Authorization: Bearer $SEC_API_KEY"

Ticker to CIK API · SEC filings API · First Interstate Bancsystem Inc on SEC.gov

Questions

What is FIBK’s CIK number?

FIBK’s SEC Central Index Key (CIK) is 0000860413, or 860413 without leading zeros. The SEC’s ticker file lists it as FIRST INTERSTATE BANCSYSTEM INC.

How do I find First Interstate Bancsystem Inc’s 10-K?

Request /api/v1/filings?cik=860413&form=10-K, or open the company’s EDGAR page and filter by 10-K. Foreign issuers file 20-F or 40-F instead.

Ticker and CIK: SEC company_tickers.json, cached 2026-11-02. Tickers can move between entities; the CIK identifies the filer.

Plain-text version for agents and LLMs: /companies/fibk.md

Independent. Not affiliated with, endorsed by, or sponsored by the U.S. Securities and Exchange Commission. Data is reproduced from public SEC filings and datasets. Not investment advice.