Solid Power (SLDP) CFO has 72,310 shares withheld in RSU tax event

Rhea-AI Filing Summary

Solid Power, Inc. reported that CFO, Treasurer, & Secretary Linda C. Heller had 72,310 shares of common stock withheld at $2.60 per share to cover taxes on vesting restricted stock units. This tax-withholding disposition is not an open-market sale. She now directly holds 1,948,844 shares of common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Heller Linda C.

Role CFO, Treasurer, & Secretary

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	72,310	$2.60	$188K

Holdings After Transaction: Common Stock — 1,948,844 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares withheld for taxes: 72,310 shares Withholding price: $2.60 per share Shares held after transaction: 1,948,844 shares +1 more

4 metrics

Shares withheld for taxes 72,310 shares Tax obligation on vesting restricted stock units

Withholding price $2.60 per share Value used for tax-withholding disposition

Shares held after transaction 1,948,844 shares Direct ownership following tax withholding

Transaction code F Payment of tax liability by delivering securities

Key Terms

restricted stock units, tax obligation, withheld, Form 4

4 terms

restricted stock units financial

"upon the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax obligation financial

"withheld to satisfy the reporting person's tax obligation"

withheld financial

"Represents shares of the issuer's common stock withheld to satisfy"

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/01/2026 - 05:11 PM Accepted by SEC EDGAR 07/01/2026 - 05:10 PM 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^*

Heller Linda C.

(Last) (First) (Middle)

486 S. PIERCE AVE.

SUITE E

(Street)

LOUISVILLE COLORADO 80027

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Solid Power, Inc. [ SLDP ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CFO, Treasurer, & Secretary

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/30/2026

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

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

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

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	06/30/2026		F		72,310(1)	D	$2.6	1,948,844	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. Represents shares of the issuer's common stock withheld to satisfy the reporting person's tax obligation upon the vesting of restricted stock units.

	/s/ Kristen Gould, attorney-in-fact on behalf of Linda C. Heller	07/01/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Solid Power (SLDP) disclose in this Form 4?

Solid Power reported that CFO Linda C. Heller had 72,310 common shares withheld at $2.60 per share to satisfy taxes on vesting restricted stock units, a routine non-market tax-withholding disposition rather than an open-market stock sale.

Did Solid Power CFO Linda Heller sell shares on the open market?

No, Linda Heller did not sell shares on the open market. The 72,310 shares reported were withheld by the company to cover her tax obligation triggered by restricted stock units vesting, a standard administrative transaction rather than a discretionary stock sale.

How many Solid Power shares does the CFO hold after this transaction?

After the tax-withholding disposition, CFO Linda Heller directly holds 1,948,844 shares of Solid Power common stock. This figure reflects her position following the withholding of 72,310 shares for taxes associated with the vesting of restricted stock units.

What does transaction code "F" mean in Solid Power’s Form 4 filing?

Transaction code "F" indicates shares were used to pay an exercise price or tax liability. Here, 72,310 shares of Solid Power common stock were withheld specifically to satisfy CFO Linda Heller’s tax obligation from vesting restricted stock units, not from a market trade.

Is the Solid Power Form 4 transaction a strong bullish or bearish signal?

This Form 4 filing reflects a routine tax-withholding event, not a strategic buy or sell decision. Because the 72,310 shares were withheld for taxes on restricted stock units, it generally carries limited informational value about management’s view of Solid Power’s future prospects.