X0306 4 2016-11-01 0 0001580808 A10 Networks, Inc. ATEN 0001358721 COCHRAN ROBERT D C/O A10 NETWORKS, INC. 3 WEST PLUMERIA DRIVE SAN JOSE CA 95134 1 1 0 0 VP, Legal & Corp Collaboration Common Stock 2016-11-01 4 S 0 7000 7.606 D 132728 D The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person. This is the weighted average price of the shares sold, which ranged from $7.47 to $7.81 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4. /s/ Robert D. Cochran 2016-11-02