Annual Meeting of Stockholders

The 2020 annual meeting of stockholders (the “Annual Meeting”) of A10 Networks, Inc., a Delaware corporation, will be held on May 27, 2020 at 10:00 a.m. Pacific Time, at 2300 Orchard Parkway, San Jose, CA 95131

Electronic Proxy Voting

The Notice of Internet Availability of Proxy Materials containing instructions on how to access this proxy statement and our annual report is first being mailed on or about April 15, 2020 to all stockholders entitled to vote at the Annual Meeting. The proxy statement and our 2019 annual report can be accessed directly at the following Internet address http://www.proxyvote.com. All you have to do is enter the control number located on your proxy card.

* We intend to hold our Annual Meeting in person. However, we are actively monitoring the coronavirus (COVID-19) situation and are sensitive to the public health and travel concerns our stockholders may have and the protocols that federal, state, and local governments may impose. In the event it is not possible or advisable to hold our Annual Meeting in person, we will announce alternative arrangements for the meeting as promptly as practicable, which may include holding the meeting solely by means of remote communication. If we take this step, we will announce the decision to do so in advance by filing Definitive Additional Materials with the SEC along with notice of the change(s) to the Annual Meeting, and details on how to participate will be available at www.proxydocs.com and http://investors.a10networks.com