Stem executive settles RSUs, tax share sale

Rhea-AI Filing Summary

STEM, INC. President of Software Products Matthew Tappin settled equity awards and related taxes. On March 7, 2026, 1,458 restricted stock units converted into 1,458 common shares at a conversion price of $0.00 per share on a one-for-one basis.

In connection with this settlement, 655 common shares were automatically sold in a “sell to cover” transaction at $11.12 per share to satisfy tax liabilities, which the company notes was not a discretionary trade. After these transactions, Tappin held 3,225 common shares directly, with no remaining derivative position reported.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 3 txns

Insider Tappin Matthew

Role President, Software Products

Sold 655 shs ($7K)

Approx. gross sale proceeds $7K

Approx. exercise cost $0.00

Type	Security	Shares	Price	Value
Sale	Common Stock, Par Value $0.0001 Per Share	655	$11.12	$7K
Exercise	Restricted Stock Unit	1,458	$0.00	$0.00
Exercise	Common Stock, Par Value $0.0001 Per Share	1,458	$0.00	$0.00

Holdings After Transaction: Restricted Stock Unit — 1,459 contracts (Direct); Common Stock, Par Value $0.0001 Per Share — 3,225 shares (Direct)

Footnotes (3)

1. F1. Each restricted stock unit ("RSU") converted into a share of common stock on a one-for-one basis.
2. 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.
3. 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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did STEM (STEM) executive Matthew Tappin report in this Form 4?

Matthew Tappin reported settlement of 1,458 restricted stock units into common shares and an automatic sale of 655 shares to cover taxes, leaving him with 3,225 directly held STEM common shares following these transactions.

How many restricted stock units did Matthew Tappin settle at STEM?

Matthew Tappin settled 1,458 restricted stock units, each converting into one share of STEM common stock at a conversion price of $0.00, as part of an equity award vesting on March 7, 2026, under a prior RSU grant.

Why were 655 STEM shares sold in Matthew Tappin’s Form 4 filing?

The 655 STEM shares were automatically sold to cover Matthew Tappin’s tax liability arising from the March 7, 2026 restricted stock unit settlement. The company states this “sell to cover” transaction was not a discretionary trade by the reporting person.

What price did the automatic tax sale shares of STEM common stock receive?

The 655 STEM common shares in the automatic tax sale were sold at $11.12 per share. This transaction was specifically described as a sell-to-cover event tied to tax obligations from the restricted stock unit settlement, not an open-market discretionary sale.

How many STEM shares does Matthew Tappin hold after these transactions?

After the RSU conversion and the automatic tax-related sale, Matthew Tappin directly owned 3,225 shares of STEM common stock. The filing shows no remaining derivative securities for him following these March 2026 equity award transactions.

What was the source and vesting schedule of Matthew Tappin’s STEM RSUs?

The restricted stock units came from a 4,375-unit grant awarded on May 28, 2024. These RSUs vest in three nearly equal annual installments, and the second installment vested on March 7, 2026, triggering the conversion reported in this Form 4.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/10/2026 - 05:13 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Tappin Matthew

(Last) (First) (Middle)

1400 POST OAK BOULEVARD

SUITE 560

(Street)

HOUSTON TX 77056

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
STEM, INC. [ STEM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President, Software Products

3. Date of Earliest Transaction (Month/Day/Year)
03/07/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, Par Value $0.0001 Per Share	03/07/2026		M		1,458	A	(1)	3,880	D
Common Stock, Par Value $0.0001 Per Share	03/10/2026		S(2)		655	D	$11.12	3,225	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Unit	(1)	03/07/2026		M			1,458	(1)	(3)	Common Stock, Par Value $0.0001 Per Share	1,458	$0	1,459	D

Explanation of Responses:

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

2. 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.

3. 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.

Remarks:

	/s/ Sarah Dunn, attorney-in-fact	03/10/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.