X0609 4/A 2026-05-20 2026-05-21 0 0001844862 Solid Power, Inc. SLDP 0001879989 Goldberg Steven H false C/O SOLID POWER, INC. 486 S PIERCE AVE., SUITE E LOUISVILLE CO 80027 1 0 0 0 0 Common Stock 2026-05-20 4 A 0 44133 0 A 162941 D Represents stock units, which upon vesting of the unit, represent the right to receive one share of the issuer's common stock. The stock units vest upon the earlier of: (i) the first anniversary of the grant date or (ii) the day before the issuer's next annual meeting of stockholders following the grant date, in each case, subject to the reporting person continuing to be a service provider (as defined in the Solid Power, Inc. 2021 Equity Incentive Plan) through such vesting date. The reporting person has elected to defer settlement pursuant to the Solid Power, Inc. Directors' Deferred Equity Compensation Plan. This amendment is being filed to clarify that the reporting person received stock units pursuant to the Solid Power, Inc. Directors' Deferred Equity Compensation Plan. /s/ Kristen Gould, attorney-in-fact on behalf of Steven H. Goldberg 2026-05-21