13D Filing: Viex Capital Advisors, LLC and A10 Networks Inc. (ATEN)

The following constitutes
the Schedule 13D filed by the undersigned (the “Schedule 13D”).

Item 1.

Security and Issuer.

This statement relates
to the Common Stock, $0.0001 par value (the “Shares”), of A10 Networks, Inc., a Delaware corporation (the “Issuer”).
The address of the principal executive offices of the Issuer is 3 West Plumeria Drive, San Jose, California 95134.

Item 2.

Identity and Background.

(a)

This statement is filed by:

(i)

VIEX Opportunities Fund, LP – Series One (“Series One”), a series of VIEX Opportunities Fund, LP, a Delaware series limited partnership, with respect to the Shares directly and beneficially owned by it;

(ii)

VIEX Special Opportunities Fund II, LP (“VSO II”), a Delaware limited partnership, with respect to the Shares directly and beneficially owned by it;

(iii)

VIEX GP, LLC (“VIEX GP”), a Delaware limited liability company, as the general partner of Series One;

(iv)

VIEX Special Opportunities GP II, LLC (“VSO GP II”), a Delaware limited liability company, as the general partner of VSO II;

(v)

VIEX Capital Advisors, LLC (“VIEX Capital”), a Delaware limited liability company, as the investment manager of each of Series One and VSO II; and

(vi)

Eric Singer, as managing member of each of VIEX GP, VSO GP II, and VIEX Capital.

Each of the foregoing
is referred to as a “Reporting Person” and collectively as the “Reporting Persons.” Each of the Reporting
Persons is party to that certain Joint Filing Agreement as further described in Item 6. Accordingly, the Reporting Persons are
hereby filing a joint Schedule 13D.

(b)       The
address of the principal office of each of the Reporting Persons is 825 Third Avenue, 33^rd Floor, New York, New York
10022.

(c)       The
principal business of Series One and VSO II is investing in securities. The principal business of VIEX GP is acting as the general
partner of Series One. The principal business of VSO GP II is acting as the general partner of VSO II. The principal business of
VIEX Capital is serving as the investment manager to Series One and VSO II. The principal occupation of Mr. Singer is serving as
the managing member of each of VIEX GP, VSO GP II and VIEX Capital.

(d)       No
Reporting Person has, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar
misdemeanors).