X0206 3 2021-09-22 0 0001865107 A.K.A. BRANDS HOLDING CORP. AKA 0001881947 NEW EXCELERATE L.P. 222 BERKELEY STREET, 18TH FLOOR BOSTON MA 02116 0 0 1 0 0000830588 SUMMIT PARTNERS L P 222 BERKELEY STREET, 18TH FLOOR BOSTON MA 02116 0 0 1 0 0001882852 SUMMIT PARTNERS GROWTH EQUITY FUND IX-B AIV, L.P. 222 BERKELEY STREET, 18TH FLOOR BOSTON MA 02116 0 0 1 0 0001882851 SUMMIT PARTNERS GROWTH EQUITY FUND IX-A AIV, L.P. 222 BERKELEY STREET, 18TH FLOOR BOSTON MA 02116 0 0 1 0 0001239366 CHUNG PETER Y 222 BERKELEY STREET, 18TH FLOOR BOSTON MA 02116 0 0 1 0 0001296022 Fitzgerald Charles James JR 222 BERKELEY STREET, 18TH FLOOR BOSTON MA 02116 0 0 1 0 Common Stock, par value $0.001 per share 72644324 I See Footnotes Represents 72,644,324 shares of common stock held directly by New Excelerate L.P., the voting and disposition of which is controlled by Summit Partners, L.P. Summit Partners, L.P. is (i) the sole shareholder of Summit Partners GE IX AIV, Ltd., which is the general partner of Summit Partners GE IX AIV, L.P., which is the general partner of Summit Partners Growth Equity Fund IX-B AIV, L.P. ("Summit IX-B") and (ii) the sole member of Summit Partners GE IX, LLC, which is the general partner of Summit Partners GE IX, L.P., which is the general partner of Summit Partners Growth Equity Fund IX-A AIV, L.P ("Summit IX-A"). Summit IX-A and Summit IX-B have equal ownership of limited partnership interests of New Excelerate, L.P. Excelerate GP, Ltd. is the general partner of New Excelerate L.P. Summit Partners, L.P., through a two-person investment committee, currently comprised of Peter Y. Chung and Charles J. Fitzgerald, has voting and dispositive authority over the shares beneficially owned by each of these entities and therefore beneficially owns such shares. Mr. Chung and Mr. Fitzgerald disclaim beneficial ownership of the shares held directly by New Excelerate, L.P. /s/ Robin W. Devereux, as attorney-in-fact for New Excelerate, L.P. 2021-09-22 /s/ Robin W. Devereux, as attorney-in-fact for Summit Partners, L.P. 2021-09-22 /s/ Robin W. Devereux, as attorney-in-fact for Summit Partners Growth Equity Fund IX-B AIV, L.P. 2021-09-22 /s/ Robin W. Devereux, as attorney-in-fact for Summit Partners Growth Equity Fund IX-A AIV, L.P. 2021-09-22 /s/ Robin W. Devereux, as attorney-in-fact for Peter Y. Chung 2021-09-22 /s/ Robin W. Devereux, as attorney-in-fact for Charles J. Fitzgerald 2021-09-22