A10 NETWORKS INC

Item 1.01 Entry into a Material Definitive Agreement. Warrant On August 3, 2026, A10 Networks, Inc. (the "Company") issued a warrant (the "Warrant") to Microsoft Corporation ("Microsoft") pursuant to which Microsoft may purchase up to 800,000 shares of the Company's common stock, par value $0.00001 per share (the "Warrant Shares"), at an exercise price of $0.01 per share, subject to the terms and conditions of the Warrant. The Warrant was issued in connection with certain commercial arrangements between the parties, with vesting tied to purchases by Microsoft and its affiliates of the Company's products and services. The Warrant is eligible to vest in two tranches based on Microsoft's achievement of specified purchase thresholds during measurement periods ending June 30, 2027 and June 30, 2028. Depending on the level of purchases during each measurement period, up to 400,000 Warrant Shares may vest with respect to each tranche, for a maximum of 800,000 Warrant Shares. If the applicable purchase thresholds are not achieved during a measurement period, the corresponding tranche of the Warrant will expire unvested. Subject to the terms and conditions of the Warrant, the Warrant is exercisable in whole or in part after January 1, 2028 with respect to the Warrant Shares subject to the first tranche and after January 1, 2029 with respect to the Warrant Shares subject to the second tranche, in each case until the 5:00 p.m., Eastern time on August 3, 2036, subject to certain extensions described in the Warrant, at the Warrantholder's election by cash payment or cashless exercise. The Warrant also contains customary provisions regarding adjustments for stock splits, stock dividends and certain other corporate transactions, transfer restrictions and accelerated vesting of certain Warrant Shares upon the occurrence of specified change of control transactions. The Warrant was issued, and the Warrant Shares may be issued, in reliance on the exemption from registration pursuant to Section 4(a)(2) of the Securities Act of 1933, as amended. The foregoing description is not complete and is qualified in its entirety by reference to the text of the Warrant, which is filed as Exhibit 4.1 to this Current Report on Form 8-K and incorporated herein by reference.

Item 3.02 Unregistered Sales of Equity Securities. The information set forth in Item 1.01 of this Current Report on Form 8-K is incorporated by reference into this Item 3.02.