William Blair Investment Management Reduces Stake in Antero Resources

The firm sold 391,641 shares of the oil and natural gas company in the third quarter.

Mar. 3, 2026 at 7:55am

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William Blair Investment Management LLC decreased its position in Antero Resources Corporation (NYSE:AR) by 43.9% during the 3rd quarter, according to the company's recent disclosure with the Securities & Exchange Commission. The fund owned 501,284 shares of the oil and natural gas company's stock after selling 391,641 shares during the period.

Why it matters

This move by a major institutional investor like William Blair could signal a shift in sentiment around Antero Resources, which may impact the stock price and trading activity going forward. The reduction in stake could also indicate a broader pullback from the energy sector among some investors.

The details

According to the filing, William Blair Investment Management now owns 0.16% of Antero Resources, down from 0.29% previously. The firm cited the 43.9% reduction in its position during the third quarter. Antero Resources is an independent exploration and production company focused on natural gas, natural gas liquids, and oil properties in the Appalachian Basin.

  • William Blair Investment Management reduced its stake in Antero Resources during the 3rd quarter of 2026.

The players

William Blair Investment Management LLC

An investment management firm that decreased its position in Antero Resources Corporation.

Antero Resources Corporation

An independent exploration and production company focused on natural gas, natural gas liquids, and oil properties in the Appalachian Basin.

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The takeaway

This reduction in stake by a major institutional investor like William Blair could signal a shift in sentiment around Antero Resources and the broader energy sector, which investors will want to monitor closely going forward.