Fortinet, Inc. — Director's Dealing 2026

Feb 3, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Fortinet, Inc. (FTNT)
CIK: 0001262039
Period of Report: 2026-02-01

Reporting Person: Whittle John (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-01	Common Stock	M	1185	—	Acquired	77465	Direct
2026-02-01	Common Stock	M	1608	—	Acquired	79073	Direct
2026-02-01	Common Stock	M	1827	—	Acquired	80900	Direct
2026-02-01	Common Stock	M	4550	—	Acquired	85450	Direct
2026-02-01	Common Stock	M	19962	—	Acquired	105412	Direct
2026-02-01	Common Stock	F	12951	$81.26	Disposed	92461	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-01	Restricted Stock Units	$0	M	1185	Disposed		Common Stock (1185)	Direct
2026-02-01	Restricted Stock Units	$0	M	1608	Disposed		Common Stock (1608)	Direct
2026-02-01	Restricted Stock Units	$0	M	1827	Disposed		Common Stock (1827)	Direct
2026-02-01	Restricted Stock Units	$0	M	4550	Disposed		Common Stock (4550)	Direct
2026-02-01	Performance Stock Units	$0	M	19962	Disposed		Common Stock (19962)	Direct

Footnotes

F1: Vesting of restricted stock units ("RSUs") or performance stock units ("PSUs") previously granted to the Reporting Person.

F2: 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 RSUs.

F3: Each RSU or PSU represents a contingent right to receive one share of the Issuer's common stock upon settlement.

F4: 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.

F5: RSUs and PSUs do not expire; they either vest or are canceled prior to the vesting date.

F6: 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.

F7: 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 settlement.

F8: 25% of the RSUs will vest 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.

F9: 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.