William Blair Investment Management Increases Stake in Banner Corporation

The investment firm raised its holdings in the financial services provider by 13.5% in the third quarter.

Published on Mar. 2, 2026

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William Blair Investment Management LLC increased its stake in shares of Banner Corporation (NASDAQ:BANR) by 13.5% in the third quarter, according to the company's latest SEC filing. The fund now owns 709,665 shares of the financial services provider's stock, valued at $46.48 million, representing 2.08% ownership of the company.

Why it matters

This investment by a major institutional investor signals confidence in Banner Corporation's performance and growth potential. As a regional bank with a strong presence in the Pacific Northwest, Banner's financial results and expansion plans are closely watched by the investment community.

The details

According to the SEC filing, William Blair Investment Management purchased an additional 84,283 shares of Banner Corporation during the third quarter. This increased the firm's total holdings to 709,665 shares, or 2.08% of the company's outstanding stock. Banner Corporation is a regional commercial bank headquartered in Walla Walla, Washington, offering a range of financial products and services to individual and business clients throughout the Pacific Northwest.

  • The stake increase occurred in the third quarter of the most recent fiscal year.

The players

William Blair Investment Management LLC

An investment management firm that oversees over $70 billion in assets for institutional and individual clients.

Banner Corporation

A regional commercial bank headquartered in Walla Walla, Washington, with a strong presence in the Pacific Northwest.

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The takeaway

William Blair's increased investment in Banner Corporation reflects the firm's confidence in the bank's growth prospects and ability to generate returns for shareholders. As a major institutional investor, William Blair's actions are closely watched by the broader market and may signal further positive momentum for Banner's stock.