William Blair Investment Management Boosts Spire Inc. Stake

Institutional investor increases ownership in utility company by over 30%

Mar. 3, 2026 at 8:07am

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William Blair Investment Management LLC has increased its stake in Spire Inc. (NYSE:SR) by 30.8% during the third quarter, according to a recent 13F filing. The institutional investor now owns 374,050 shares of the utilities provider's stock, worth approximately $30.5 million.

Why it matters

Spire is a regulated natural gas distribution company serving over 1.7 million customers across the central and southern United States. The increase in ownership by a major institutional investor like William Blair suggests confidence in the company's long-term growth prospects.

The details

According to the 13F filing, William Blair Investment Management purchased an additional 88,154 shares of Spire during the third quarter, bringing its total ownership to about 0.63% of the company. Spire has seen increased investment from hedge funds and other institutional investors in recent quarters as the company has focused on expanding its natural gas distribution business through strategic acquisitions.

  • William Blair Investment Management filed its 13F report for the third quarter of 2026 on March 3, 2026.

The players

William Blair Investment Management LLC

An institutional investment management firm that oversees over $100 billion in assets.

Spire Inc.

A regulated natural gas distribution company headquartered in St. Louis, Missouri that serves over 1.7 million customers across the central and southern United States.

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The takeaway

The increased investment in Spire by a major institutional player like William Blair suggests the utility company's long-term growth potential is being recognized by the market. As Spire continues to expand its natural gas distribution footprint through strategic acquisitions, it could attract further institutional interest.