Matthew Tappin - 07 Mar 2026 Form 4 Insider Report for STEM, INC. (STEM)

Reporting relationship: President, Software Products
Issuer ticker: STEM
Reported as of: 07 Mar 2026
Net transaction value: -$7,284
SEC form: 4
Accepted by SEC: 10 Mar 2026, 17:13:14 UTC
Prior SEC filing: 04 Mar 2026
Next SEC filing: 13 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 10 Mar 2026.

Key facts

This page summarizes Matthew Tappin's Form 4 filing for STEM, INC. (STEM).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 10 Mar 2026, 17:13.

Change

Previous filing in this sequence was filed on 04 Mar 2026.
Current net transaction value: -$7,284.

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: 10 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: +1,458
Change %: +60%
Price
Shares after: 3,880
Date: 07 Mar 2026
Ownership: Direct
Footnotes: F1

STEM transaction

Common Stock, Par Value $0.0001 Per Share

Sale

Transaction value: $7,284
Shares: -655
Change %: -17%
Price: $11.12
Shares after: 3,225
Date: 10 Mar 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

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

STEM transaction Derivative

Restricted Stock Unit

Options Exercise

Transaction value
Shares: -1,458
Change %: -50%
Price: $0.000000^*
Shares after: 1,459
Date: 07 Mar 2026
Ownership: Direct
Underlying class: Common Stock, Par Value $0.0001 Per Share
Underlying amount: 1,458
Exercise price
Footnotes: F1, F3

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

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

Footnote F2

Represents shares of common stock automatically sold to cover the reporting person's tax liability in connection with the settlement of restricted stock units on March 7, 2026. This "sell to cover" transaction does not represent a discretionary trade by the reporting person.

Footnote F3

On May 28, 2024, the reporting person was granted 4,375 RSUs vesting in three near equal annual installments, the second of which vested on March 7, 2026.