Certain Class A Common Stock of StepStone Group Inc. are subject to a Lock-Up Agreement Ending on 15-FEB-2022. These Class A Common Stock will be under lockup for 91 days starting from 16-NOV-2021 to 15-FEB-2022. Details: The directors, executive officers and the selling stockholders have entered into lock-up agreements with the underwriters prior to the commencement of this offering pursuant to which each of these persons or entities, with limited exceptions, for a period of 90 days after the date of this prospectus supplement, generally may not, without the prior written consent of each of the underwriters, (1) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of common stock or any securities convertible into or exercisable or exchangeable for common stock (including, without limitation, common stock, partnership interests in the Partnership or such other securities which may be deemed to be beneficially owned by such directors, executive officers and stockholders in accordance with the rules and regulations of the SEC and securities which may be issued upon vesting, settlement or exercise of a restricted stock unit, option, warrant or other right to purchase shares of common stock or partnership interests in the Partnership), (2) enter into any hedging, swap or other agreement or transaction that transfers, in whole or in part, any of the economic consequences of ownership of common stock, or partnership interest in the Partnership, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of common stock, partnership interest in the Partnership or such other securities, in cash or otherwise, (3) make any demand for, or exercise any right with respect to, the registration of any shares of common stock or partnership interest in the Partnership or (4) publicly disclose the intention to engage in any of these activities. Notwithstanding the foregoing, the lock-up agreement for a certain selling stockholder, which beneficially owns less than 5% of Class A common stock, includes an exception to sell or transfer up to 200,000 shares of Class A common stock during the 90-day lock-up period so long as no Exchange Act filing, or other public announcement is required or made voluntarily in connection with such sale or transfer.