Granahan Investment Reduces Stake in Archer Aviation

Institutional investor trims position in electric aircraft startup by 9.3% in Q3 2025

Mar. 16, 2026 at 10:38am

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Granahan Investment Management LLC, a major institutional investor, reduced its holdings in Archer Aviation Inc. (NYSE:ACHR) by 9.3% during the third quarter of 2025, according to a recent 13F filing with the Securities and Exchange Commission. Granahan Investment Management now owns 2,940,100 shares of the electric aircraft company, making it Archer Aviation's 27th largest shareholder.

Why it matters

Archer Aviation is a closely watched startup in the emerging electric vertical takeoff and landing (eVTOL) aircraft market, which aims to develop sustainable urban air mobility solutions. Institutional investor activity in the company's stock is closely monitored as a signal of market sentiment around Archer's progress and future prospects.

The details

According to the 13F filing, Granahan Investment Management sold 302,520 shares of Archer Aviation during the third quarter, reducing its total position to 2,940,100 shares. This represents about 0.45% of Archer's outstanding stock. The investment firm cited unspecified portfolio management reasons for the reduction in its Archer Aviation holdings.

  • Granahan Investment Management filed its 13F report for the third quarter of 2025 on March 16, 2026.

The players

Granahan Investment Management LLC

An institutional investment management firm that owned a 1.2% stake in Archer Aviation as of the end of the third quarter of 2025.

Archer Aviation Inc.

A California-based aerospace company developing electric vertical takeoff and landing (eVTOL) aircraft for urban air mobility applications.

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The takeaway

Archer Aviation's stock performance and institutional investor activity will continue to be closely watched as the company works to develop and certify its eVTOL aircraft technology. The reduction in Granahan Investment Management's position, while relatively small, could signal broader market uncertainty around the timeline and commercial viability of Archer's urban air mobility plans.