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.+ Fortinet, Inc. Important Notice Regarding the Availability of Proxy Materials for the Fortinet, Inc. Stockholder Meeting to be Held on June 21, 2019 Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the annual stockholders’ meeting are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the annual meeting are on the reverse side. Your vote is important! This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The proxy statement and 2018 annual report are available at:www.envisionreports.com/FTNT • Easy Online Access — A Convenient Way to View Proxy Materials and Vote When you go online to view materials, you can also vote your shares. Step 1: Go to www.envisionreports.com/FTNT to view the materials. Step 2: Click on Cast Your Vote or Request Materials. Step 3: Follow the instructions on the screen to log in. Step 4: Make your selection as instructed on each screen to select delivery preferences and vote. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Obtaining a Copy of the Proxy Materials – If you want to receive a copy of these documents, you must request one. There is no charge to you for requesting a copy. Please make your request for a copy as instructed on the reverse side on or before June 11, 2019 to facilitate timely delivery. 2NOT + 031ZMC




.Stockholder Meeting Notice Dear Fortinet, Inc. Stockholder: The 2019 Annual Meeting of Stockholders of Fortinet, Inc. (the “Company”) will be held at the Company’s principal executive offices located at 899 Kifer Road, Sunnyvale, CA 94086, on Friday, June 21, 2019, at 10:00 a.m. Pacific time. Proposals to be considered at the Annual Meeting: (1) To elect five directors to serve for a term of one year until the next annual meeting of stockholders or until their respective successors have been duly elected and qualified. Nominees:— Ken Xie— Ming Hsieh— Gary Locke— Christopher B. Paisley— Judith Sim (2) To ratify the appointment of Deloitte & Touche LLP as Fortinet’s independent registered accounting firm for the fiscal year ending December 31, 2019.(3) Advisory vote to approve named executive officer compensation, as disclosed in the proxy statement.(4) To approve the Amended and Restated 2009 Fortinet, Inc. Equity Incentive Plan.The Board of Directors Recommends a Vote “FOR” each of the Nominees listed in Proposal 1, and “FOR” Proposals 2, 3 and 4. The Board of Directors has fixed the close of business on April 24, 2019 as the record date for the determination of stockholders entitled to receive notice of, and to vote at, the 2019 Annual Meeting or any adjournment(s) or postponement(s) thereof. Stockholders of record as of April 24, 2019 are cordially invited and encouraged to attend the Annual Meeting. Directions to attend the Annual Meeting where you may vote in person can be found on our website, investor.fortinet.com/contactus.cfm PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must vote online or request a paper copy of the proxy materials to receive a proxy card. If you wish to attend and vote at the meeting, please bring this notice with you. Here’s how to order a copy of the proxy materials and select a future delivery preference: Paper copies: Current and future paper delivery requests can be submitted via the telephone, Internet or email options below. Email copies: Current and future email delivery requests must be submitted via the Internet following the instructions below.If you request an email copy of current materials you will receive an email with a link to the materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a set of proxy materials.• Internet – Go to www.envisionreports.com/FTNT. Click Cast Your Vote or Request Materials. Follow the instructions to log in and order a copy of the current meeting materials and submit your preference for email or paper delivery of future meeting materials.• Telephone – Call us free of charge at 1-866-641-4276 and follow the instructions to log in and order a paper copy of the materials by mail for the current meeting. You can also submit a preference to receive a paper copy for future meetings.• Email – Send email to investorvote@computershare.com with “Proxy Materials Fortinet, Inc.” in the subject line. Include in the message your full name and address, plus the number located in the shaded bar on the reverse, and state in the email that you want a paper copy of current meeting materials. You can also state your preference to receive a paper copy for future meetings. To facilitate timely delivery, all requests for a paper copy of the proxy materials must be received by June 11, 2019. 031ZMC