BlackRock, Inc. filed a prospectus supplement on June 30, 2026, to register the issuance of up to 12,035,866 shares of its common stock. These shares are intended for holders of Class B-2 membership units of BlackRock Saturn Subco, LLC (Subco), a subsidiary. The shares will be issued upon redemption of SubCo Units, which were partly issued as consideration for the acquisition of HPS Investment Partners. The total shares include up to 7,606,927 shares for units issued at the closing of the HPS Transaction on July 1, 2025, and up to 4,428,939 shares for potential future deferred consideration units. SubCo Units can be redeemed for either common stock or a cash settlement, at the option of the unit holder, with BlackRock having the option to assume redemption obligations. BlackRock expects to assume these obligations through direct exchanges for common stock. The filing also includes a legal opinion regarding the validity of the shares being registered.