Fortinet stock rises as Dimensional Fund Advisors boosts stake

Institutional investor increases position in cybersecurity firm by nearly 29% in Q3

Mar. 6, 2026 at 9:25am

Got story updates? Submit your updates here. ›

Dimensional Fund Advisors LP, a major institutional investor, increased its stake in Fortinet, Inc. (NASDAQ:FTNT) by 28.7% during the third quarter of 2026, according to a recent 13F filing with the Securities and Exchange Commission (SEC). The firm now owns 3,846,164 shares of the cybersecurity software maker, representing approximately 0.50% of Fortinet's outstanding stock.

Why it matters

Fortinet is a leading provider of network security solutions, and institutional investors closely watch changes in major shareholders' positions. This increase by Dimensional Fund Advisors, a respected investment management firm, suggests confidence in Fortinet's long-term growth prospects amid ongoing demand for cybersecurity products and services.

The details

According to the 13F filing, Dimensional Fund Advisors acquired an additional 858,723 shares of Fortinet during the third quarter, bringing its total position to 3,846,164 shares. The firm cited Fortinet's strong market position and growth potential as factors behind the increased investment.

  • Dimensional Fund Advisors raised its Fortinet stake during the 3rd quarter of 2026.
  • The 13F filing disclosing the increased position was submitted on 2026-03-06.

The players

Dimensional Fund Advisors LP

A global investment management firm that provides a range of equity, fixed income, and alternative investment strategies to institutional and individual investors worldwide.

Fortinet, Inc.

A multinational cybersecurity company that develops and delivers integrated security solutions for enterprise, service provider, and government customers globally.

Got photos? Submit your photos here. ›

The takeaway

Dimensional Fund Advisors' increased stake in Fortinet reflects the firm's confidence in the cybersecurity company's long-term growth potential, underscoring the continued strong demand for Fortinet's security products and services in the market.