Sec Form 4 Filing - Argonaut Private Equity, L.L.C. @ StepStone Group Inc. - 2020-09-18

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Argonaut Private Equity, L.L.C. 2. Issuer Name and Ticker or Trading Symbol StepStone Group Inc. [ STEP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 6733 S. YALE AVE., 3. Date of Earliest Transaction (MM/DD/YY) 09/18/2020 (Street) TULSA, OK74136 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 09/18/2020 P( 1 ) 62,500 A $ 18 62,500 D ( 2 ) Class A Common Stock 09/18/2020 P( 1 ) 62,500 A $ 18 62,500 D ( 3 ) Class B Common Stock 09/18/2020 J( 4 ) 3,830,328 D 6,432,858 D ( 5 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Class B Units ( 6 ) 09/18/2020 J( 4 ) 3,830,328 ( 6 ) ( 6 ) Class A Common Stock 3,830,328 ( 4 ) 6,432,858 D ( 5 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Argonaut Private Equity, L.L.C. 6733 S. YALE AVE. TULSA, OK74136 X Argonaut Holdings, L.L.C. 6733 S. YALE AVE. TULSA, OK74136 X KAISER GEORGE B C/O FREDERIC DORWART, LAWYERS 124 EAST FOURTH STREET TULSA, OK74103 X Mitchell Steven R C/O STEPSTONE GROUP INC. 450 LEXINGTON AVENUE, 31ST FLOOR NEW YORK, NY10017 X X Waldo Robert C/O STEPSTONE GROUP INC. 450 LEXINGTON AVENUE, 31ST FLOOR NEW YORK, NY10017 X X Signatures Argonaut Private Equity, L.L.C.; By /s/ Frederic Dorwart, Manager 09/18/2020 Signature of Reporting Person Date Argonaut Holdings, LLC.; By Argonaut Private Equity, L.L.C., Manager; By /s/ Frederic Dorwart, Manager 09/18/2020 Signature of Reporting Person Date /s/ Frederic Dorwart, Attorney-in-fact for George B. Kaiser 09/18/2020 Signature of Reporting Person Date /s/ Jennifer Ishiguro, Attorney-in-fact for Steven R. Mitchell 09/18/2020 Signature of Reporting Person Date /s/ Jennifer Ishiguro, Attorney-in-fact for Robert A. Waldo 09/18/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents the purchase of shares of Class A Common Stock in the Issuer's initial public offering ("IPO"). ( 2 )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. ( 3 )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. ( 4 )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. ( 5 )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. ( 6 )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.

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