X0306 4 2017-02-06 0 0001580808 A10 Networks, Inc. ATEN 0001601653 Jalan Rajkumar C/O A10 NETWORKS, INC. 3 WEST PLUMERIA DRIVE SAN JOSE CA 95134 0 1 0 0 Chief Technology Officer Common Stock 2017-02-06 4 A 0 60002 0.00 A 360300 D Each share is represented by a Performance Restricted Stock Unit ("PSU"). Each PSU represents a contingent right to receive one share of ATEN common stock. The PSUs will vest in equal annual increments over a four year period that began on February 12, 2016, subject to the Reporting Person's continued service through each such vest date. Includes shares acquired by the Reporting Person pursuant to the Issuer's Employee Stock Purchase Plan. Robert Cochran, as Attorney-in-Fact 2017-02-08