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First Interstate BancSystem to acquire Great Western Bancorp

RECENTLY ACQUIREDSep 29, 2026

Acquiring Company

First Interstate Bank

Acquired Company

Great Western Bancorp

BillingsSioux FallsAgriculture and FarmingFinancial ServicesFinanceBanking

Description

First Interstate BancSystem announced the acquisition of Great Western Bancorp in an all-stock deal valued at USD 2 billion. This strategic move aims to expand First Interstate's banking footprint. The merger connects two significant players in the regional banking market. Great Western Bancorp operates under Great Western Bank and offers a wide range of financial services.

Company Information

Company

First Interstate Bank

Location

Billings, Montana, United States

About

First Interstate Bank is a wholly-owned subsidiary of First Interstate BancSystem, Inc. It provides a variety of banking products and services across several states. The bank focuses on personal, commercial, and investment banking services. First Interstate is known for its community involvement and customer service.

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Frequently asked

Who acquired Great Western Bancorp?

Great Western Bancorp was acquired by First Interstate Bank, based in Billings. The deal was reported on September 29, 2026. First Interstate Bank is a wholly-owned subsidiary of First Interstate BancSystem, Inc. It provides a variety of banking products and services across several states. First Interstate Bank is privately held.

When did First Interstate Bank acquire Great Western Bancorp?

First Interstate Bank's acquisition of Great Western Bancorp was reported on September 29, 2026. First Interstate BancSystem announced the acquisition of Great Western Bancorp in an all-stock deal valued at USD 2 billion. This strategic move aims to expand First Interstate's banking footprint. Fundz records the date the transaction was first publicly reported, sourced from filings and company announcements.

What does Great Western Bancorp do?

Great Western Bancorp, Inc. is the parent company of Great Western Bank. It provides a variety of financial services, including business banking, agricultural lending, and wealth management. It is privately held, operating in Agriculture and Farming, and is based in Sioux Falls.

This company was part of an acquisition. Fundz tracks who bought whom, and who to call on both sides.

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Fundz is a real-time business intelligence platform powered by agentic AI that proactively delivers personalized daily signals, including funding rounds, executive changes, M&A activity, 13F institutional filings, SEC 8-K events, investor activity, and website modifications, based on each user's watchlist and ICP. A trusted data source at firms such as BlackRock, Oracle, Kleiner Perkins, LinkedIn, HubSpot, and Cloudflare, Fundz democratizes the institutional-grade intelligence that previously required a PitchBook or Bloomberg terminal. Features include FundzWatch™ for automated website change detection, Daily Briefing for AI-powered daily briefings, and unified cross-signal alerts across 281,000+ organizations. Developers and data teams can access these signals programmatically via the Fundz Funding Data API, with transparent published pricing.