X0508 4 2025-12-10 0 0001796022 StepStone Group Inc. STEP 0001822880 McCabe Michael I C/O STEPSTONE GROUP INC. 277 PARK AVENUE, 45TH FLOOR NEW YORK NY 10172 1 1 0 1 Head of Strategy See remarks 0 Class A Common Stock 2025-12-10 4 S 0 108538 66.15 D 315326 D Class A Common Stock 2025-12-10 4 S 0 9300 66.82 D 306026 D Class A Common Stock 2025-12-10 4 S 0 74214 66.14 D 122209 I By Benzy LLC Class B Common Stock 1906142 D Class B Common Stock 937416 I By Benzy LLC The sales reported in this Form 4 were effected in multiple trades at prices ranging from $66.00 to $66.79. 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. The sales reported in this Form 4 were effected in multiple trades at prices ranging from $66.73 to $67.00. 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. The sales reported in this Form 4 were effected in multiple trades at prices ranging from $66.00 to $66.90. 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. /s/ Jennifer Ishiguro, Attorney-in-fact for Michael I. McCabe 2025-12-12