X0609 4 2026-06-01 0 0001796022 StepStone Group Inc. STEP 0001822276 Fernandez Jose A false C/O STEPSTONE GROUP INC. 277 PARK AVENUE, 45TH FLOOR NEW YORK NY 10172 1 1 0 0 Co-Chief Operating Officer 1 Class A Common Stock 2026-06-01 4 S 0 28324 47.90 D 173966 I By Trust Class A Common Stock 2026-06-01 4 S 0 56176 48.57 D 117790 I By Trust Class A Common Stock 2026-06-01 4 S 0 12117 49.78 D 105673 I By Trust Class A Common Stock 2026-06-01 4 S 0 3383 50.59 D 102290 I By Trust Class A Common Stock 2026-06-02 4 S 0 85200 46.41 D 17090 I By Trust Class A Common Stock 2026-06-02 4 S 0 14800 47.33 D 2290 I By Trust Class A Common Stock 2026-06-03 4 S 0 2290 42.64 D 0 I By Trust Class A Common Stock 16538 D Class B Common Stock 3016601 I By Trust Class B Common Stock 1605500 I By Santaluz Capital Partners, LLC This transaction was executed pursuant to a Rule 10b5-1 trading plan in multiple trades at prices ranging from $47.25 to $48.24. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed pursuant to a Rule 10b5-1 trading plan in multiple trades at prices ranging from $48.25 to $49.18. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed pursuant to a Rule 10b5-1 trading plan in multiple trades at prices ranging from $49.31 to $50.29. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed pursuant to a Rule 10b5-1 trading plan in multiple trades at prices ranging from $50.31 to $50.93. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed pursuant to a Rule 10b5-1 trading plan in multiple trades at prices ranging from $46.00 to $46.99. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed pursuant to a Rule 10b5-1 trading plan in multiple trades at prices ranging from $47.00 to $47.76. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed pursuant to a Rule 10b5-1 trading plan at a price of $42.64. The reporting person hereby undertakes to provide upon request to the SEC staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was effected. The 16,538 shares of Class A Common Stock reported as held directly reflect the correction of a clerical error in the Reporting Person's Form 4 filed on March 17, 2026, which was carried forward on the Reporting Person's Form 4 filed on April 2, 2026. Both filings inadvertently reported 2,290 shares as held directly that had previously been transferred to the Fernandez Family Trust. The correct balances at the time of those filings were 16,538 shares held directly and 2,290 shares held indirectly through the Trust (March 17, 2026 filing) and 16,538 shares held directly and 202,290 shares held indirectly through the Trust (April 2, 2026 filing). Total beneficial ownership was correctly reported on both prior filings. /s/ Jennifer Ishiguro, Attorney-in-fact for Jose A. Fernandez 2026-06-03