William Blair Investment Management Boosts Stake in Old National Bancorp

Institutional investor increases ownership in regional bank by 12.4%

Published on Mar. 2, 2026

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William Blair Investment Management LLC increased its stake in Old National Bancorp (NASDAQ:ONB) by 12.4% in the 3rd quarter, according to a recent SEC filing. The institutional investor now owns 5,869,840 shares of the bank's stock, representing about 1.50% ownership.

Why it matters

This increase in ownership by a major institutional investor signals confidence in Old National Bancorp's performance and growth potential. As a regional bank, Old National Bancorp's stock movements and ownership changes can provide insights into the health of the broader banking sector.

The details

According to the filing, William Blair Investment Management acquired an additional 645,288 shares of Old National Bancorp during the 3rd quarter. The firm now owns approximately 5.87 million shares, worth around $128.8 million based on the bank's current stock price.

  • The increase in ownership occurred during the 3rd quarter of the year.

The players

William Blair Investment Management LLC

An institutional investment management firm that has increased its stake in Old National Bancorp.

Old National Bancorp

A regional bank holding company headquartered in Evansville, Indiana that provides a range of commercial and consumer banking services.

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The takeaway

This move by a major institutional investor suggests confidence in Old National Bancorp's future prospects, which could signal positive momentum for the regional bank's stock and the broader banking industry.