X0202 SCHEDULE 13G/A 0001535264 XXXXXXXX LIVE 1 Class A Common Stock, Par Value $0.0001 03/31/2026 0001462056 Backblaze, Inc. 05637B105 2261 MARKET STREET STE 81006 SAN FRANCISCO CA 94114 Rule 13d-1(b) AWM Investment Company, Inc. DE 1400166.00 1400166.00 1400166.00 2.3 IA Backblaze, Inc. 2261 MARKET STREET STE 81006, SAN FRANCISCO, CALIFORNIA, 94114 AWM Investment Company, Inc., a Delaware corporation (AWM), is the investment adviser to Special Situations Cayman Fund, L.P. (CAYMAN), Special Situations Fund III QP, L.P. (SSFQP), Special Situations Private Equity Fund, L.P. (SSPE), Special Situations Technology Fund, L.P. (TECH) and Special Situations Technology Fund II, L.P. (TECH II) (CAYMAN, SSFQP, SSPE, TECH and TECH II will hereafter be referred to as the Funds). As the investment adviser to the Funds, AWM holds sole voting and investment power over 0 shares of Common Stock of the Issuer (the Shares) held by CAYMAN, 0 Shares held by SSFQP, 180,916 Shares held by SSPE, 204,876 Shares held by TECH and 1,014,374 Shares held by TECH II. 527 Madison Avenue, Suite 2600 New York, NY 10022 AWM is a Delaware Corporation Y 1,400,166 2.3 AWM is the investment adviser to each of the Funds. As the investment adviser to the Funds, AWM holds sole voting power over 0 shares of Common Stock of the Issuer (the Shares) held by CAYMAN, 0 Shares held by SSFQP, 180,916 Shares held by SSPE, 204,876 Shares held by TECH and 1,014,374 Shares held by TECH II. Greenhouse and Stettner are members of SSCAY, the general partner of CAYMAN. Greenhouse and Stettner are members of: MGP, the general partner of SSFQP; MG, the general partner of SSPE and SSTA, the general partner of TECH and TECH II. Greenhouse and Stettner are also controlling principals of AWM. AWM is the investment adviser to each of the Funds. As the investment adviser to the Funds, AWM holds sole investment power over 0 shares of Common Stock of the Issuer (the Shares) held by CAYMAN, 0 Shares held by SSFQP, 180,916 Shares held by SSPE, 204,876 Shares held by TECH and 1,014,374 Shares held by TECH II. Greenhouse and Stettner are members of SSCAY, the general partner of CAYMAN. Greenhouse and Stettner are members of: MGP, the general partner of SSFQP; MG, the general partner of SSPE and SSTA, the general partner of TECH and TECH II. Greenhouse and Stettner are also controlling principals of AWM. Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. AWM Investment Company, Inc. Adam Stettner 05/04/2026