144 0001494616 XXXXXXXX LIVE 0001580808 A10 NETWORKS, INC. 001-36343 2300 ORCHARD PKWY SAN JOSE CA 95131 6178241000 Summit Investors I (UK), L.P. Shareholder Common Morgan Stanley

1585 Broadway New York NY 10036

1236 19034.40 74455219 05/20/2024 NYSE Common 03/21/2014 Conversion of preferred stock in connection with IPO Issuer N 1236 03/21/2014 Securities of the issuer were received in connection with a series of reorganizational transactions completed in connection with the issuer's IPO Y 05/20/2024 /s/ Adam H. Hennessey