Solid Power (SLDP) CEO has shares withheld to cover RSU tax bill

Rhea-AI Filing Summary

Solid Power, Inc. President and CEO John C. Van Scoter reported a routine tax-related share disposition. On the vesting of restricted stock units, 308,010 shares of common stock were withheld to cover his tax obligation at $3.075 per share. Following this non-market transaction, he directly holds 4,872,151 shares of Solid Power common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Van Scoter John C.

Role President & CEO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	308,010	$3.075	$947K

Holdings After Transaction: Common Stock — 4,872,151 shares (Direct, null)

Footnotes (1)

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Key Figures

Tax-withheld shares: 308,010 shares Withholding price: $3.075 per share Post-transaction holdings: 4,872,151 shares

3 metrics

Tax-withheld shares 308,010 shares Shares of common stock withheld for tax obligation on RSU vesting

Withholding price $3.075 per share Value per common share used for tax-withholding disposition

Post-transaction holdings 4,872,151 shares Common shares directly held by CEO after withholding

Key Terms

restricted stock units, tax obligation, tax-withholding disposition, 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"

tax-withholding disposition financial

"transaction_action: tax-withholding disposition"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Form 4 regulatory

"reported in this Form 4 insider filing"

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.

Form 4 Insider Transactions: What Each Field Means →

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^*

Van Scoter John 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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/11/2026

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	05/11/2026		F		308,010(1)	D	$3.075	4,872,151	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	05/12/2026
	** 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 did Solid Power (SLDP) CEO John C. Van Scoter report in this Form 4?

John C. Van Scoter reported a tax-related share disposition, not an open-market sale. Solid Power withheld 308,010 common shares to satisfy his tax obligation upon restricted stock unit vesting, a routine administrative transaction reflecting compensation rather than discretionary trading.

How many Solid Power (SLDP) shares were withheld for the CEO’s taxes?

Solid Power withheld 308,010 shares of common stock to cover John C. Van Scoter’s tax obligation. The shares were valued at $3.075 per share and were tied to the vesting of restricted stock units granted as part of his equity compensation.

Does the Solid Power (SLDP) Form 4 show an open-market sale by the CEO?

The Form 4 does not show an open-market sale. Instead, it records 308,010 shares withheld by Solid Power to pay John C. Van Scoter’s tax liability on restricted stock unit vesting, a non-market, compensation-related disposition common for equity awards.

How many Solid Power (SLDP) shares does the CEO hold after this transaction?

After the tax-withholding disposition, John C. Van Scoter directly holds 4,872,151 shares of Solid Power common stock. This figure reflects his remaining direct ownership position following the withholding of 308,010 shares to cover taxes from restricted stock unit vesting.

What is the transaction code “F” used in the Solid Power (SLDP) Form 4?

Transaction code “F” indicates shares withheld to pay an exercise price or tax liability. In this Solid Power filing, it shows 308,010 shares were retained by the company to satisfy John C. Van Scoter’s tax obligation when his restricted stock units vested.