William Blair Investment Management Boosts Stake in Atlantic Union Bankshares

Institutional investor increases position in regional bank by 5% in third quarter

Published on Mar. 2, 2026

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William Blair Investment Management LLC, a prominent investment management firm, has increased its stake in Atlantic Union Bankshares Co. (NASDAQ:AUB) by 5% in the third quarter, according to a recent SEC filing. The firm now owns approximately 1,021,450 shares of the regional bank's stock, representing around 0.72% of the company's outstanding shares.

Why it matters

This move by William Blair Investment Management suggests the firm sees continued growth potential in Atlantic Union Bankshares, which operates a network of branches across Virginia, Maryland, North Carolina, and Washington, D.C. The bank's stock has performed well over the past year, and the increased institutional investment could signal confidence in the company's future prospects.

The details

According to the SEC filing, William Blair Investment Management purchased an additional 48,270 shares of Atlantic Union Bankshares during the third quarter, bringing its total position to 1,021,450 shares. This represents a 5% increase in the firm's stake in the regional bank. Atlantic Union Bankshares is a full-service commercial and consumer banking institution that offers a range of deposit accounts, loans, and other financial services to individuals and businesses in its regional markets.

  • The SEC filing detailing William Blair Investment Management's increased stake in Atlantic Union Bankshares was made on March 2, 2026.
  • The additional 48,270 shares were purchased by William Blair Investment Management during the third quarter of 2025.

The players

William Blair Investment Management LLC

A prominent investment management firm that has increased its stake in Atlantic Union Bankshares Co. by 5% in the third quarter of 2025.

Atlantic Union Bankshares Co.

A regional bank headquartered in Richmond, Virginia, that operates a network of branches across Virginia, Maryland, North Carolina, and Washington, D.C.

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The takeaway

The increased investment by William Blair Investment Management in Atlantic Union Bankshares suggests the firm sees continued growth potential in the regional bank, which has performed well over the past year. This move could signal broader institutional confidence in the company's future prospects as it continues to serve its regional markets.