Matthew Tappin - 26 Feb 2026 Form 4 Insider Report for STEM, INC. (STEM)

Reporting relationship: President, Software Products
Issuer ticker: STEM
Reported as of: 26 Feb 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 02 Mar 2026, 19:32:17 UTC
Prior SEC filing: 23 Feb 2026
Next SEC filing: 04 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Sarah Dunn, attorney-in-fact

Key filing fact

Matthew Tappin filed Form 4 for STEM, INC. (STEM) on 02 Mar 2026.

Key facts

This page summarizes Matthew Tappin's Form 4 filing for STEM, INC. (STEM).
4 reported transactions and 3 derivative rows are listed below.
Accepted by SEC: 02 Mar 2026, 19:32.

Change

Previous filing in this sequence was filed on 23 Feb 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001986259 Primary reporting owner

Tappin Matthew

Relationship: President, Software Products
Address: 1400 POST OAK BOULEVARD, SUITE 560, HOUSTON
Signature: /s/ Sarah Dunn, attorney-in-fact
Signature date: 02 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

STEM transaction

Common Stock, Par Value $0.0001 Per Share

Options Exercise

Transaction value
Shares: +670
Change %: +30%
Price
Shares after: 2,907
Date: 01 Mar 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

STEM transaction Derivative

Restricted Stock Unit

Award

Transaction value: $0
Shares: +25,800
Change %
Price: $0.000000
Shares after: 25,800
Date: 26 Feb 2026
Ownership: Direct
Underlying class: Common Stock, Par Value $0.0001 Per Share
Underlying amount: 25,800
Exercise price
Footnotes: F2, F3

STEM transaction Derivative

Performance Stock Unit

Award

Transaction value: $0
Shares: +17,200
Change %
Price: $0.000000
Shares after: 17,200
Date: 26 Feb 2026
Ownership: Direct
Underlying class: Common Stock, Par Value $0.0001 Per Share
Underlying amount: 17,200
Exercise price
Footnotes: F2, F4

STEM transaction Derivative

Restricted Stock Unit

Options Exercise

Transaction value: $0
Shares: -670
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 01 Mar 2026
Ownership: Direct
Underlying class: Common Stock, Par Value $0.0001 Per Share
Underlying amount: 670
Exercise price
Footnotes: F1, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

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

Footnote 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.

Footnote 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.

Footnote 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.

Footnote 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.