William Blair Investment Management Boosts Humana Holdings

Institutional investor increases stake in insurance provider by over 250% in Q3

Published on Mar. 4, 2026

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According to a recent 13F filing, William Blair Investment Management LLC grew its position in Humana Inc. (NYSE: HUM) by 256.1% in the third quarter, acquiring an additional 27,684 shares. The institutional investor now owns 38,495 shares of the insurance provider's stock, valued at $10,015,000 as of the filing.

Why it matters

This significant increase in Humana holdings by a major institutional investor suggests growing confidence in the insurance company's outlook and performance, despite recent stock price declines. Humana is a key player in the Medicare Advantage market, which continues to see strong growth as the U.S. population ages.

The details

According to the 13F filing, William Blair Investment Management LLC acquired 27,684 additional shares of Humana in the third quarter, bringing its total position to 38,495 shares. This represents a 256.1% increase in the firm's Humana holdings compared to the prior quarter. Humana's stock has faced pressure in recent months, with the share price declining from a 52-week high of $315.35 to around $181 currently.

  • William Blair Investment Management LLC filed the 13F report disclosing the Humana share purchases in the third quarter of 2026.

The players

William Blair Investment Management LLC

An institutional investment management firm that has significantly increased its stake in Humana Inc.

Humana Inc.

A major health insurance provider, particularly known for its Medicare Advantage plans.

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The takeaway

This filing suggests William Blair Investment Management sees long-term value in Humana's business model and growth prospects, even as the stock has faced near-term headwinds. The substantial increase in ownership could signal the firm's belief that Humana remains well-positioned in the evolving healthcare landscape.