A10 Networks, Inc. — Director's Dealing 2014

Mar 28, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: A10 Networks, Inc. (ATEN)
CIK: 0001580808
Period of Report: 2014-03-26

Reporting Person: SUMMIT PARTNERS L P (Manager of GP of 10% Owner)
Reporting Person: Summit Investors Management, LLC (Manager of GP of 10% Owner)
Reporting Person: SUMMIT PARTNERS GE VIII, L.P. (GP of 10% owner)
Reporting Person: Summit Partners GE VIII, LLC (GP of 10% owner)
Reporting Person: MANNION MARTIN J (Manager of GP of 10% owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-03-26	Common Stock	C	9427846	—	Acquired	9427846	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-03-26	Series D Redeemable Convertible Preferred Stock	$	C	80000	Disposed		Common Stock (9427846)	Indirect

Footnotes

F1: In connection with the closing of A10 Networks, Inc.'s (the "Issuer") initial public offering of common stock on March 26, 2014, each share of Series D Redeemable Convertible Preferred Stock automatically converted into shares of common stock at a conversion ratio of 117.8481-to-one. Prior to the conversion, each share of Series D Redeemable Convertible Preferred Stock was convertible without payment of further consideration.

F2: The common stock is held as follows: 6,873,136 in the name of Summit Partners Growth Equity Fund VIII-A, L.P.; 2,510,989 in the name of Summit Partners Growth Equity Fund VIII-B, L.P., 40,186 in the name of Summit Investors I, LLC; and 3,535 in the name of Summit Investors I (UK), L.P.

F3: The Series D Redeemable Convertible Preferred Stock had no expiration date.