X0306 4 2022-04-28 0 0001758766 STEM, INC. STEM 0001250209 MORGAN MICHAEL C 100 CALIFORNIA STREET 14TH FLOOR SAN FRANCISCO CA 94111 1 0 0 0 Common Stock, Par Value $0.0001 Per Share 2022-04-28 4 M 0 5524 0 A 5524 D Common Stock, Par Value $0.0001 Per Share 1178937 I Held by Portcullis Investments, LP Common Stock, Par Value $0.0001 Per Share 50000 I Held by Portcullis Partners, LP Common Stock, Par Value $0.0001 Per Share 542181 I By Trust Common Stock, Par Value $0.0001 Per Share 37500 I By Trust Common Stock, Par Value $0.0001 Per Share 37500 I By Trust Restricted Stock Unit 2022-04-28 4 M 0 5524 0 D Common Stock, Par Value $0.0001 Per Share 5524.0 0 D Represents shares of common stock issued to the reporting person upon vesting of restricted stock units ("RSUs") that were issued to the reporting person on July 2, 2021 under the Stem, Inc. 2021 Equity Incentive Plan. The reporting person serves as Manager of the general partner, Portcullis G.P., LLC, for, and he and his spouse indirectly hold interests in, Portcullis Investments, L.P. The reporting person disclaims any beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly. The reporting person serves as Manager of the general partner, Portcullis G.P., LLC, for, and he and his spouse indirectly hold interests in, Portcullis Partners, L.P. The reporting person disclaims any beneficial ownership of the reported shares other than to the extent of any pecuniary interest he may have therein, directly or indirectly. Held by a trust of which the reporting person is a trustee. Held by a family trust (M GST) of which the reporting person is an investment adviser. Held by a family trust (C GST) of which the reporting person is an investment adviser. On July 2, 2021, the reporting person was granted 5,524 RSUs vesting 100% on April 28, 2021. /s/ Kathy Medford, Attorney-in-Fact 2022-04-28