[Form 4] Solid Power, Inc. Insider Trading Activity

Rhea-AI Filing Summary

John C. Van Scoter, President & CEO and director of Solid Power, Inc. (SLDP), reported a transaction on 09/30/2025 in which 42,842 shares of the company's common stock were disposed of at a price of $3.52 per share. The filing indicates these shares were withheld to satisfy tax obligations upon the vesting of restricted stock units.

After the withholding, the reporting person beneficially owned 3,998,017 shares of common stock, held directly. The Form 4 was signed on behalf of Mr. Van Scoter by an attorney-in-fact on 10/01/2025.

Positive

• Disclosure compliance observed: Form 4 filed and signed by attorney-in-fact, indicating adherence to reporting rules
• Substantial ongoing ownership: reporting person retains 3,998,017 shares after the transaction

Negative

• Shares disposed: 42,842 shares were withheld to satisfy taxes, reducing immediate share count
• Price shown for the tax-withheld shares was $3.52, reflecting the valuation used for the withholding event

Insights

Financial Analyst

TL;DR: Routine tax-withholding disposition after RSU vesting; modest absolute share reduction, no clear market-moving implication from this single filing.

The transaction is coded as a disposition resulting from tax withholding on vested restricted stock units rather than an open-market sale. The number of shares surrendered (42,842) is small relative to the remaining direct holdings (3,998,017), implying limited change to insider ownership percentage. Because the filing shows a tax-related withholding at $3.52 per share, it documents compensation settlement, not an investment decision to reduce exposure.

Corporate Governance Expert

TL;DR: Standard post-vesting withholding; consistent with executive compensation procedures and SEC reporting obligations.

The Form 4 discloses an insider disposition coded as tax withholding following RSU vesting, which is a common administrative action. The report also confirms the reporting persons roles as President & CEO and director. The timely filing and attorney-in-fact signature indicate compliance with disclosure requirements; there is no indication of atypical governance concerns from the provided details.

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

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

1. Name and Address of Reporting Person^*

Van Scoter John C.

(Last) (First) (Middle)

486 S. PIERCE AVE., SUITE E

(Street)

LOUISVILLE CO 80027

(City) (State) (Zip)

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

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

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President & CEO

3. Date of Earliest Transaction (Month/Day/Year)
09/30/2025

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	09/30/2025		F		42,842(1)	D	$3.52	3,998,017	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 John C. Van Scoter	10/01/2025
	** 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.

FAQ

What transaction did John C. Van Scoter report on Form 4 for SLDP?

The filing reports a disposition of 42,842 shares on 09/30/2025 related to tax withholding upon RSU vesting.

Why were 42,842 shares disposed according to the Form 4?

The shares were withheld to satisfy the reporting person's tax obligation when restricted stock units vested.

How many SLDP shares does John C. Van Scoter beneficially own after the transaction?

After the reported withholding, he beneficially owns 3,998,017 shares held directly.

At what price were the withheld SLDP shares recorded?

The withheld shares are recorded at a price of $3.52 per share in the Form 4.

Who signed the Form 4 on behalf of John C. Van Scoter and when?

The Form 4 was signed by Kristen Gould, attorney-in-fact on 10/01/2025.