X0306 4 2020-09-18 0 0001796022 StepStone Group Inc. STEP 0001585937 Argonaut Private Equity, L.L.C. 6733 S. YALE AVE. TULSA OK 74136 0 0 1 0 0001394221 Argonaut Holdings, L.L.C. 6733 S. YALE AVE. TULSA OK 74136 0 0 1 0 0001163432 KAISER GEORGE B C/O FREDERIC DORWART, LAWYERS 124 EAST FOURTH STREET TULSA OK 74103 0 0 1 0 0001610279 Mitchell Steven R C/O STEPSTONE GROUP INC. 450 LEXINGTON AVENUE, 31ST FLOOR NEW YORK NY 10017 1 0 1 0 0001728668 Waldo Robert C/O STEPSTONE GROUP INC. 450 LEXINGTON AVENUE, 31ST FLOOR NEW YORK NY 10017 1 0 1 0 Class A Common Stock 2020-09-18 4 P 0 62500 18 A 62500 D Class A Common Stock 2020-09-18 4 P 0 62500 18 A 62500 D Class B Common Stock 2020-09-18 4 J 0 3830328 D 6432858 D Class B Units 2020-09-18 4 J 0 3830328 D Class A Common Stock 3830328 6432858 D Represents the purchase of shares of Class A Common Stock in the Issuer's initial public offering ("IPO"). These securities are held of record by Steven R. Mitchell. Each of Argonaut Private Equity, L.L.C., Argonaut Holdings, LLC, George Kaiser and Robert A. Waldo disclaims beneficial ownership of these securities to the extent it or he does not have a pecuniary interest therein. These securities are held of record by Robert A. Waldo. Each of Argonaut Private Equity, L.L.C., Argonaut Holdings, LLC, George Kaiser and Steven R. Mitchell disclaims beneficial ownership of these securities to the extent it or he does not have a pecuniary interest therein. Represents 3,830,328 Class B Units of StepStone Group LP (the "Partnership") and a corresponding number of shares of Class B Common Stock transferred by Argonaut Holdings, LLC to the Issuer in connection with the closing of the IPO at a price of $18.00 for one Class B Unit and one share of Class B Common Stock. These securities are held of record by Argonaut Holdings, LLC. Argonaut Holdings, LLC is managed by Argonaut Private Equity, L.L.C. Steven R. Mitchell has a derivative interest in Argonaut Private Equity, L.L.C. Robert A. Waldo is a manager and Vice President of Argonaut Private Equity, L.L.C. and has a derivative interest therein. George B. Kaiser is the sole member of Argonaut Private Equity, L.L.C. Each of Steven R. Mitchell, Robert A. Waldo and George B. Kaiser disclaims beneficial ownership of the securities reported herein for purposes of Rule 16a-1(a) under the Securities and Exchange Act of 1934, as amended, except to the extent of his pecuniary interest therein, if any. The Class B Units of the Partnership are exchangeable, on a one-for-one basis, for shares of Class A Common Stock. Upon exchange of a Class B Unit, the corresponding share of Class B Common Stock will be automatically redeemed and cancelled. Argonaut Private Equity, L.L.C.; By /s/ Frederic Dorwart, Manager 2020-09-18 Argonaut Holdings, LLC.; By Argonaut Private Equity, L.L.C., Manager; By /s/ Frederic Dorwart, Manager 2020-09-18 /s/ Frederic Dorwart, Attorney-in-fact for George B. Kaiser 2020-09-18 /s/ Jennifer Ishiguro, Attorney-in-fact for Steven R. Mitchell 2020-09-18 /s/ Jennifer Ishiguro, Attorney-in-fact for Robert A. Waldo 2020-09-18