13D Filing: VIEX Capital Advisors and A10 Networks Inc. (ATEN)

(b)

1. Sole power to vote or direct vote: 0 2. Shared power to vote or direct vote: 1,763,575 3. Sole power to dispose or direct the disposition: 0 4. Shared power to dispose or direct the disposition: 1,763,575

(c)

VIEX GP has not entered into any transactions in the Shares since the filing of the Schedule 13D. The transactions in the shares on behalf of Series One since the filing of the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

D.

VSO GP II

(a)

VSO GP II, as the general partner of VSO II, may be deemed the beneficial owner of the 2,033,808 Shares beneficially owned by VSO II.

Percentage: Approximately
2.9%

(b)

1. Sole power to vote or direct vote: 0 2. Shared power to vote or direct vote: 2,033,808 3. Sole power to dispose or direct the disposition: 0 4. Shared power to dispose or direct the disposition: 2,033,808

(c)

VSO GP II has not entered into any transactions in the Shares since the filing of the Schedule 13D. The transactions in the Shares on behalf of VSO II since the filing of the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

E.

VIEX Capital

(a)

VIEX Capital, as the investment manager of Series One and VSO II, may be deemed the beneficial owner of the (i) 1,763,575 Shares beneficially owned by Series One and (ii) 2,033,808 Shares beneficially owned by VSO II.

Percentage: Approximately
5.4%

(b)

1. Sole power to vote or direct vote: 0 2. Shared power to vote or direct vote: 3,797,383 3. Sole power to dispose or direct the disposition: 0 4. Shared power to dispose or direct the disposition: 3,797,383

(c)

VIEX Capital has not entered into any transactions in the Shares since the filing of the Schedule 13D. The transactions in the Shares on behalf of each of Series One and VSO II since the filing of the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

F.

Eric Singer

(a)

Mr. Singer, as the managing member of VIEX GP and VIEX Capital, may be deemed the beneficial owner of the (i) 1,763,575 Shares beneficially owned by Series One and (ii) 2,033,808 Shares beneficially owned by VSO II.

Percentage: Approximately
5.4%