STEM, INC. — Director's Dealing 2026

Mar 3, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: STEM, INC. (STEM)
CIK: 0001758766
Period of Report: 2026-02-26

Reporting Person: Tappin Matthew (President, Software Products)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-03-01	Common Stock, Par Value $0.0001 Per Share	M	670	—	Acquired	2907	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-26	Restricted Stock Unit	$	A	25800	Acquired		Common Stock, Par Value $0.0001 Per Share (25800)	Direct
2026-02-26	Performance Stock Unit	$	A	17200	Acquired		Common Stock, Par Value $0.0001 Per Share (17200)	Direct
2026-03-01	Restricted Stock Unit	$	M	670	Disposed		Common Stock, Par Value $0.0001 Per Share (670)	Direct

Footnotes

F1: Each restricted stock unit ("RSU") converted into a share of common stock on a one-for-one basis.

F2: Each restricted stock unit ("RSU") and performance stock unit ("PSU") represents a contingent right to receive one share of the Issuer's common stock.

F3: On February 26, 2026, the Reporting Person was granted 25,800 RSUs vesting in three nearly equal annual installments (33%, 33%, 34%), beginning on March 7, 2027.

F4: On February 26, 2026, the Reporting Person was granted 17,200 PSUs, a portion of which vests, if the volume-weighted average price of the Issuer's common stock for any consecutive sixty (60) trading-day period equals or exceeds a stock price target.

F5: On March 1, 2022, the reporting person was granted 2,679 RSUs vesting in four near equal annual installments, the fourth of which vested on March 1, 2026.