X0609 4 2026-06-30 0 0001758766 STEM, INC. STEM 0001672864 Laureles Saul R. false 1400 POST OAK BOULEVARD SUITE 560 HOUSTON TX 77056 0 1 0 0 Chief Legal Officer 0 Common Stock, Par Value $0.0001 Per Share 2026-06-30 4 M 0 5000 7.81 A 32450 D Common Stock, Par Value $0.0001 Per Share 2026-06-30 4 M 0 2750 7.81 A 35200 D Common Stock, Par Value $0.0001 Per Share 2026-07-02 4 S 0 675 7.85 D 34525 D Performance Stock Unit 2026-06-30 4 M 0 2750 0 D Common Stock, Par Value $0.0001 Per Share 2750 2750 D Performance Stock Unit 2026-06-30 4 M 0 5000 0 D Common Stock, Par Value $0.0001 Per Share 5000 5000 D Represents shares of common stock automatically sold to cover the reporting person's tax liability in connection with the settlement of PSUs on June 30, 2026. This "sell to cover" transaction does not represent a discretionary trade by the reporting person. Each performance stock unit ("PSU") represented a contingent right to receive one share of the Issuer's common stock if the volume-weighted average price of the Issuer's common stock for any consecutive sixty (60) trading-day period equaled or exceeded $17.60 (the "Performance Metric") during a performance period ending on June 30, 2028 (the "Performance Period"). On June 30, 2025, the Reporting Person was granted 5,500 PSUs, 2,750 of which vested on June 30, 2026 following the Issuer's achievement of the Performance Metric during the Performance Period. On July 28, 2025, the Reporting Person was granted 10,000 PSUs, 5,000 of which vested on June 30, 2026 following the Issuer's achievement of the Performance Metric during the Performance Period. /s/ Sarah Dunn, attorney-in-fact 2026-07-02