On May 15, 2017, A10 Networks, Inc. (the “Company”) entered into an offer letter with Tom Constantino, 52, to serve as the Company’s Executive Vice President, Chief Financial Officer, effective June 12, 2017. Shiva Natarajan, the Company’s Interim Chief Financial Officer, will assume the position of Vice President, Finance at that time.

From November 2015 to December 2016, Mr. Constantino served as the Vice President of Finance and Head of Accounting & Finance Operations at Western Digital Corporation, a company that provides data storage solutions. While at Western Digital, from March 2012 to November 2015, Mr. Constantino served as Chief Financial Officer of its HGST subsidiary. His experience also includes the role of vice president, corporate finance at Hitachi Global Storage Technologies and approximately 16 years in various financial roles at Hewlett-Packard. Also, from January 2017 to May 2017, Mr. Constantino was an independent consultant providing Chief Financial Officer and Senior Finance Executive consulting services. Mr. Constantino began his career in public accounting at PricewaterhouseCoopers and holds a Bachelor’s of Science in Business Administration from San Jose State University.

to an offer letter agreement between the Company and Mr. Constantino, executed on May 15, 2017 (the “Offer Letter”), Mr. Constantino will receive a base salary of $335,000 per annum, with a target annual bonus opportunity equal to 65% of his annual salary, which will be prorated for 2017 based on the length of his employment with the Company in 2017. In addition, Mr. Constantino will receive a sign-on bonus of $50,000 (net of taxes and withholdings). The Offer Letter also provides for the grant to Mr. Constantino of a restricted stock unit award covering 175,000 shares of the Company’s common stock and a stock option award to purchase 135,000 shares of the Company’s common stock. The restricted stock units will be scheduled to vest in four, equal installments on an annual basis over four years, subject to Mr. Constantino’s continued employment. The stock option will be scheduled to vest over a period of four years, with twenty-five percent of the award vesting after one year, and an additional 1/48^th of the award vesting on a monthly basis thereafter, subject to Mr. Constantino’s continued employment.

The Company has entered into a Change in Control and Severance Agreement with Mr. Constantino, dated May 15, 2017 (the “Change in Control and Severance Agreement”). The Change in Control and Severance Agreement is substantially similar to the change in control and severance agreements the Company has entered into with certain other executive officers of the Company, the form of which was previously filed with the Securities and Exchange Commission on March 10, 2014, as Exhibit 10.25 to Amendment No. 1 to Form S-1. The severance payments and benefits specified under the Change in Control and Severance Agreement are based on the same levels of severance payments and benefits specified for executive officers of the Company other than the Company’s Chief Executive Officer under such previously filed form.

The foregoing summary of the Offer Letter and the Change in Control and Severance Agreement is qualified in its entirety by the full texts of the Offer Letter and the Change in Control and Severance Agreement, respectively. The Offer Letter will be filed as an exhibit to the Company’s Quarterly Report on Form 10-Q for the fiscal quarter ending June 30, 2017.

There are no arrangements or understandings between Mr. Constantino and any other persons to which he was selected as Chief Financial Officer. There are no family relationships between Mr. Constantino and any director or executive officer of the Company, and he has no indirect material interest in any transaction required to be disclosed to Item 404(a) of Regulation S-K.

About A10 NETWORKS, INC. (NYSE:ATEN)

A10 Networks, Inc. is a provider of application networking and network security technologies. The Company’s solutions enable enterprises, service providers, Web companies and government organizations to secure and optimize the performance of their data center applications, and secure their users, applications and infrastructure from Internet, Web and network threats at scale. The Company’s products are built on its Advanced Core Operating System (ACOS). The Company offers approximately four software-based solutions that are built on top of its software-based ACOS cloud-ready application networking platform and are delivered primarily on its optimized hardware appliances, including Application Delivery Controller (ADC), Carrier Grade Networking (CGN), Threat Protection System (TPS) and Convergent Firewall (CFW). Its support services include installation, phone support, repair and replacement, software updates, online tools, consulting and training services.

A10 NETWORKS, INC. (NYSE:ATEN) Recent Trading Information

A10 NETWORKS, INC. (NYSE:ATEN) closed its last trading session down -0.02 at 8.16 with 435,034 shares trading hands.