X0609 4 2026-09-30 0001262039 Fortinet, Inc. FTNT 0001302110 Hsieh Ming false C/O FORTINET, INC. 909 KIFER ROAD SUNNYVALE CA 94086 true false false false 0 Common Stock 2026-09-30 4 M 0 459 0 A 10056 D Common Stock 53082 I By Trust Common Stock 25 I By Trust Common Stock 25 I By Trust Common Stock 143 I By Trust Restricted Stock Units 0 2026-09-30 4 M 0 459 0 D Common Stock 459 1377 D Vesting of restricted stock units ("RSUs") granted to the Reporting Person on August 12, 2026. Securities held by The Ming Hsieh Trust (the "Hsieh Trust"). Mr. Hsieh is the trustee of the Hsieh Trust and possesses the sole voting and dispositive power with respect to securities held by the Hsieh Trust. These securities are held by the Pauline Hsieh Irrevocable Trust dated 05/12/04, of which the Reporting Person is a trustee. These securities are held by the Tiffany Hsieh Irrevocable Trust dated 05/12/04, of which the Reporting Person is a trustee. These securities are held by the Ming Hsieh Revocable Family Trust, of which the Reporting Person is a trustee. Each RSU represents a contingent right to receive one share of the Issuer's common stock upon settlement. The RSUs will vest in substantially equal increments on each of September 30, 2026, December 31, 2026, March 31, 2027, and the earlier of (i) June 30, 2027 and (ii) the date immediately preceding the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person's provision of services to the Issuer on each vesting date. Shares of the Issuer's Common Stock will be delivered to the Reporting Person following vesting. RSUs do not expire; they either vest or are canceled prior to vest date. /s/ Robert Turner, by power of attorney 2026-10-01