X0306 4 2022-02-24 0 0001262039 Fortinet, Inc. FTNT 0001418649 Jensen Keith C/O FORTINET, INC. 899 KIFER ROAD SUNNYVALE CA 94086 0 1 0 0 CFO & Chief Accounting Officer Common Stock 2022-02-24 4 S 0 526 314.5552 D 3484 D Common Stock 2022-02-24 4 S 0 2101 316.5083 D 1383 D Common Stock 2022-02-24 4 S 0 400 317.45 D 983 D Common Stock 2022-02-24 4 S 0 100 318.28 D 883 D The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person. Represents the weighted average sale price. The lowest price at which shares were sold was $314.28 and the highest price at which shares were sold was $314.95. The Reporting Person undertakes to provide upon request to the staff of the Securities and Exchange Commission, the Issuer or its stockholders, full information regarding the total number of shares sold at each separate price within the ranges set forth in footnotes (2), (3) and (4) to this Form 4. Represents the weighted average sale price. The lowest price at which shares were sold was $316.01 and the highest price at which shares were sold was $316.93. Represents the weighted average sale price. The lowest price at which shares were sold was $317.23 and the highest price at which shares were sold was $317.64. This Form 4 is the second of two Forms 4 filed to report transactions by the Reporting Person that occurred on February 24, 2022. This Form 4 is split into two filings because the SEC's EDGAR filing system limits the number of transactions reported on a single Form 4. /s/ Robert Turner, by power of attorney 2022-02-28