X0508 4 2026-02-01 0001262039 Fortinet, Inc. FTNT 0001475586 Xie Michael C/O FORTINET, INC. 909 KIFER ROAD SUNNYVALE CA 94086 true true false false VP, ENGINEERING & CTO 0 Common Stock 2026-02-01 4 M 0 2030 0 A 10209048 D Common Stock 2026-02-01 4 M 0 2764 0 A 10211812 D Common Stock 2026-02-01 4 M 0 2243 0 A 10214055 D Common Stock 2026-02-01 4 M 0 5200 0 A 10219255 D Common Stock 2026-02-01 4 M 0 28823 0 A 10248078 D Common Stock 2026-02-01 4 F 0 18975 81.26 D 10229103 D Common Stock 2026-02-02 4 M 0 324285 16.898 A 10553388 D Common Stock 2026-02-02 4 S 0 129378 81.0089 D 10424010 D Common Stock 2026-02-02 4 S 0 204282 81.6387 D 10219728 D Common Stock 2026-02-02 4 S 0 9446 82.2831 D 10210282 D Common Stock 19825614 I By trust Common Stock 5513505 I See footnote Common Stock 5513505 I See footnote Common Stock 7573438 I By trust Common Stock 7573438 I By trust Restricted Stock Units 0 2026-02-01 4 M 0 2030 0 D Common Stock 2030 0 D Restricted Stock Units 0 2026-02-01 4 M 0 2764 0 D Common Stock 2764 11054 D Restricted Stock Units 0 2026-02-01 4 M 0 2243 0 D Common Stock 2243 17938 D Restricted Stock Units 0 2026-02-01 4 M 0 5200 0 D Common Stock 5200 15602 D Performance Stock Units 0 2026-02-01 4 M 0 28823 0 D Common Stock 28823 0 D Nonqualified Stock Option (right to buy) 16.898 2026-02-02 4 M 0 324285 0 D 2026-02-21 Common Stock 324285 0 D Vesting of restricted stock units ("RSUs") or performance stock units ("PSUs") previously granted to the Reporting Person. Exempt transaction pursuant to Section 16b-3(e) - payment of exercise price or tax liability by delivering or withholding securities incident to the receipt, exercise or vesting of a security issued in accordance with Rule 16b-3. All of the shares reported as disposed of in this Form 4 were relinquished by the Reporting Person and cancelled by the Issuer in exchange for the Issuer's agreement to pay federal and state tax withholding obligations of the Reporting Person resulting from the vesting of restricted stock units. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 10, 2024. Represents the weighted average sale price. The lowest price at which shares were sold was $80.25 and the highest price at which shares were sold was $81.245. Represents the weighted average sale price. The lowest price at which shares were sold was $81.25 and the highest price at which shares were sold was $82.24. Represents the weighted average sale price. The lowest price at which shares were sold was $82.25 and the highest price at which shares were sold was $82.36. These securities are held by the 2010 K.A. Family Trust dated May 3, 2010, for which the Reporting Person serves as a trustee. Shares held directly by the KAXX Trust under The K.A. Children's Trust dated February 9, 2011, for which the Reporting Person serves as a trustee. Shares held directly by the KAJJ Trust under The K.A. Children's Trust dated February 9, 2011, for which the Reporting Person serves as a trustee. These securities are held by a grantor retained annuity trust for the benefit of the Reporting Person. These securities are held by a grantor retained annuity trust for the benefit of the Reporting Person's spouse. Each RSU and PSU represents a contingent right to receive one share of the Issuer's common stock upon settlement. 25% of the RSUs vested on February 1, 2023, and the remaining 75% of the RSUs will vest in equal installments on each quarterly anniversary thereafter, until such time as the RSUs are 100% vested, subject to the Reporting Person's provision of service to the Issuer on each vesting date. Shares of the Issuer's common stock will be delivered to the Reporting Person upon settlement. RSUs and PSUs do not expire; they either vest or are canceled prior to the vesting date. 25% of the RSUs vested on February 1, 2024, and the remaining 75% of the RSUs will vest in equal installments on each quarterly anniversary thereafter, until such time as the RSUs are 100% vested, subject to the Reporting Person's provision of service to the Issuer on each vesting date. Shares of the Issuer's common stock will be delivered to the Reporting Person upon settlement. 25% of the RSUs vested on February 1, 2025, and the remaining 75% of the RSUs will vest in equal installments on each quarterly anniversary thereafter, until such time as the RSUs are 100% vested, subject to the Reporting Person's provision of service to the Issuer on each vesting date. Shares of the Issuer's common stock will be delivered to the Reporting Person upon vesting. 25% of the RSUs vested on February 1, 2026, and the remaining 75% of the RSUs will vest in equal installments on each quarterly anniversary thereafter, until such time as the RSUs are 100% vested, subject to the Reporting Person's provision of service to the Issuer on each vesting date. Shares of the Issuer's common stock will be delivered to the Reporting Person upon settlement. 100% of the PSUs vest and settle on February 1, 2026, subject to the Reporting Person's provision of service to the Issuer on such date. Shares of the Issuer's common stock will be delivered to the Reporting Person upon settlement. The options are fully vested. /s/ Robert Turner, by power of attorney 2026-02-03