Stem executive sells 402 shares under 10b5-1 plan

STEM, INC. executive Matthew Tappin, President, Software Products, reported an open-market sale of 402 shares of common stock on March 11, 2026 at an average price of $10.83 per share.

Rhea-AI Filing Summary

STEM, INC. executive Matthew Tappin, President, Software Products, reported an open-market sale of 402 shares of common stock on March 11, 2026 at an average price of $10.83 per share. After this transaction, he directly holds 2,823 shares. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on March 18, 2025, indicating it was scheduled in advance rather than timed discretionarily.

Insights

Insider trading and governance analyst

Small, pre-planned insider sale under a Rule 10b5-1 plan.

Matthew Tappin, President, Software Products at STEM, INC., sold 402 shares of common stock in an open-market transaction at $10.83 per share on March 11, 2026. Following the sale, he retains 2,823 directly held shares.

The filing notes the sale was made pursuant to a Rule 10b5-1 trading plan adopted on March 18, 2025. Such plans schedule trades in advance, reducing the informational value of the transaction’s timing. With no derivative exercises and a relatively small number of shares sold, this appears to be a routine liquidity event rather than a thesis-changing signal.

Insider Trade Summary 10b5-1

Net Seller: 402 shares

Net Sell 1 txn

Insider Tappin Matthew

Role President, Software Products

Sold 402 shs ($4K)

Type	Security	Shares	Price	Value
Sale	Common Stock, Par Value $0.0001 Per Share	402	$10.83	$4K

Holdings After Transaction: Common Stock, Par Value $0.0001 Per Share — 2,823 shares (Direct)

Footnotes (1)

1. F1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 18, 2025.

FAQ

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

What insider transaction did STEM (STEM) report for Matthew Tappin?

Matthew Tappin reported selling 402 shares of STEM common stock in an open-market transaction. The sale occurred on March 11, 2026 at an average price of $10.83 per share and was disclosed in a Form 4 insider trading report.

What is Matthew Tappin’s role at STEM (STEM) in this Form 4 filing?

Matthew Tappin is identified as an officer of STEM, serving as President, Software Products. His position means transactions in company stock must be reported on Form 4, providing transparency into his personal trading activity in STEM shares.

How many STEM (STEM) shares does Matthew Tappin hold after this sale?

After selling 402 shares, Matthew Tappin directly holds 2,823 shares of STEM common stock. This post-transaction holding is reported in the Form 4 and shows he continues to maintain an equity stake in the company after the disclosed sale.

At what price were the STEM (STEM) shares sold in this insider transaction?

The 402 STEM shares were sold at an average price of $10.83 per share. This price reflects the consideration received in the open-market sale reported in the Form 4 filing for the March 11, 2026 transaction.

Was the STEM (STEM) insider sale by Matthew Tappin under a Rule 10b5-1 plan?

Yes. The filing states the sales were effected pursuant to a Rule 10b5-1 trading plan adopted by Matthew Tappin on March 18, 2025. Such pre-arranged plans schedule trades in advance and are designed to reduce concerns about trade timing.

Does the STEM (STEM) Form 4 show any option exercises or derivative transactions?

No. The Form 4 only reports a non-derivative open-market sale of common stock. The derivative summary section is empty, indicating there were no reported option exercises, conversions, or other derivative transactions associated with this filing.

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

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Accepted by SEC EDGAR 03/13/2026 - 07:48 AM 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).

X

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)
03/11/2026

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	03/11/2026		S(1)		402	D	$10.83	2,823	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

Explanation of Responses:

1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 18, 2025.

Remarks:

	/s/ Sarah Dunn, attorney-in-fact	03/13/2026
	** 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.