William Blair Investment Management Trims Stake in Selective Insurance Group

The investment firm reduced its holdings in the insurance provider by 5.7% in the third quarter.

Published on Mar. 2, 2026

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William Blair Investment Management LLC cut its holdings in shares of Selective Insurance Group, Inc. (NASDAQ:SIGI) by 5.7% in the third quarter, according to a disclosure with the Securities and Exchange Commission (SEC). The firm owned 394,861 shares of the insurance provider's stock, valued at $32,011,000 as of its most recent SEC filing.

Why it matters

This move by a major institutional investor highlights the fluctuations in ownership and investment strategies around Selective Insurance Group, a prominent regional insurance provider. The stock's performance and valuation are closely watched by the financial community.

The details

According to the SEC filing, William Blair Investment Management sold 23,812 shares of Selective Insurance Group during the third quarter. The firm now owns about 0.65% of the company's outstanding shares. Selective Insurance Group provides a range of property and casualty insurance products to both commercial and personal customers.

  • The filing covers the third quarter of the year.
  • The shares were sold between July 1 and September 30, 2025.

The players

William Blair Investment Management LLC

An investment management firm based in Chicago that oversees over $70 billion in assets.

Selective Insurance Group, Inc.

A regional insurance provider headquartered in Branchville, New Jersey that offers a variety of property and casualty products.

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What they’re saying

“We must not let individuals continue to damage private property in San Francisco.”

— Robert Jenkins, San Francisco resident (San Francisco Chronicle)

The takeaway

This filing highlights the ongoing shifts in institutional ownership around Selective Insurance Group as investors evaluate the company's performance and outlook within the regional insurance market.