X0609 4 2026-09-30 0 0001796022 StepStone Group Inc. STEP 0001822773 Park David Y false C/O STEPSTONE GROUP INC. 277 PARK AVENUE, 45TH FLOOR NEW YORK NY 10172 0 1 0 0 Chief Financial Officer 0 Class A Common Stock 2026-09-30 4 A 0 70 36.89 A 50775 D On September 30, 2026, the Reporting Person purchased 70 shares of Class A Common Stock pursuant to the Issuer's Employee Stock Purchase Plan (the "ESPP"). The ESPP provides that eligible employees may purchase shares of Class A Common Stock at six-month period intervals for a price equal to 85% of the lower of the closing sales price of one share of Class A Common Stock (such price, the "Fair Market Value") on either the first or last trading day of the offering period. The price paid by the Reporting Person represents 85% of the Fair Market Value as of September 30, 2026. /s/ Jennifer Ishiguro, Attorney-in-fact for David Y. Park 2026-10-01