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

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(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) Mr. Singer 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.

The filing of this
Schedule 13D shall not be construed as an admission that the Reporting Persons are, for purposes of Section 13(d) of the Securities
Exchange Act of 1934, as amended, the beneficial owners of any of the Shares reported herein. Each Reporting Person disclaims beneficial
ownership of such Shares except to the extent of his or its pecuniary interest therein.

Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.
Item 6 is hereby amended to add the following:

On March 14, 2018,
the Reporting Persons and the Issuer entered into the Agreement as defined and described in Item 4.

Item 7. Material to be Filed as Exhibits.

Item 7 is hereby amended
to add the following exhibit:

99.1 Agreement, dated March 14, 2018, by and among the Reporting Persons and the Issuer (incorporated
by reference to Exhibit 10.1 to the Form 8-K filed by the Issuer on March 16, 2018).
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