Quantbot Technologies Reduces Stake in Tenable Holdings

Hedge fund cuts position in cybersecurity firm by over 40%

Published on Mar. 3, 2026

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Quantbot Technologies LP, a hedge fund, decreased its stake in Tenable Holdings, Inc. (NASDAQ:TENB) by 43.4% in the 3rd quarter of 2025, according to a recent SEC filing. The firm sold 142,780 shares, leaving it with 186,469 shares worth $5.4 million as of the end of the quarter.

Why it matters

Tenable is a leading provider of cybersecurity solutions, and changes in institutional ownership can signal shifts in investor sentiment around the company and the broader cybersecurity industry. Quantbot's reduced position could reflect concerns about Tenable's growth prospects or valuation.

The details

Quantbot sold 142,780 shares of Tenable in Q3 2025, reducing its total position to 186,469 shares worth $5.4 million. Other major investors in Tenable include Vanguard Group, which owns over 14.9 million shares, and Voya Investment Management, which owns 1.1 million shares.

  • Quantbot's reduced stake was reported in a 13F filing for Q3 2025.

The players

Quantbot Technologies LP

A hedge fund that decreased its position in Tenable Holdings by over 40% in Q3 2025.

Tenable Holdings, Inc.

A cybersecurity company that provides vulnerability management and threat exposure assessment solutions.

Vanguard Group Inc.

A major institutional investor in Tenable, owning over 14.9 million shares.

Voya Investment Management LLC

Another large institutional investor in Tenable, owning 1.1 million shares.

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The takeaway

Quantbot's reduced stake in Tenable could signal broader concerns about the cybersecurity company's growth and valuation, though the reasons behind the hedge fund's decision are not entirely clear. Investors will likely continue to monitor institutional ownership changes and other signals about Tenable's performance and outlook.