Solid Power (SLDP) CTO surrenders 33,824 shares for RSU tax withholding

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Solid Power, Inc. Chief Technology Officer Joshua Buettner-Garrett reported a tax-related share disposition. A total of 33,824 shares of common stock were withheld on June 30, 2026 to cover his tax obligations when restricted stock units vested. Following this withholding, he directly holds 1,366,018 shares of Solid Power common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Buettner-Garrett Joshua

Role Chief Technology Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	33,824	$2.60	$88K

Holdings After Transaction: Common Stock — 1,366,018 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares withheld for taxes: 33,824 shares Withholding price per share: $2.60 per share Shares held after transaction: 1,366,018 shares

3 metrics

Shares withheld for taxes 33,824 shares Common stock withheld for tax obligation on June 30, 2026

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

Shares held after transaction 1,366,018 shares Direct common stock ownership after withholding

Key Terms

restricted stock units, tax-withholding disposition, Form 4, Common Stock

4 terms

restricted stock units financial

"tax obligation 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-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

"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.

Common Stock financial

"security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/01/2026 - 05:07 PM Accepted by SEC EDGAR 07/01/2026 - 05:07 PM

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^*

Buettner-Garrett Joshua

(Last)

(First)

(Middle)

C/O SOLID POWER, INC.

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)
	Chief Technology Officer

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	06/30/2026		F		33,824⁽¹⁾	D	$2.6	1,366,018	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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 Joshua Buettner-Garrett	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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did Solid Power (SLDP) report for Joshua Buettner-Garrett?

Solid Power’s Chief Technology Officer reported shares withheld for taxes, not an open-market sale. On June 30, 2026, 33,824 common shares were retained by the company to satisfy his tax obligations upon vesting of restricted stock units.

How many Solid Power (SLDP) shares were withheld for taxes in this Form 4?

The Form 4 shows 33,824 shares of Solid Power common stock were withheld. These shares covered Joshua Buettner-Garrett’s tax liability triggered by the vesting of restricted stock units, rather than reflecting a discretionary market sale of shares.

At what price were the withheld Solid Power (SLDP) shares valued?

The withheld shares were valued at $2.60 per share. This price is used to calculate the value of the 33,824 shares surrendered to meet Joshua Buettner-Garrett’s tax obligation tied to his restricted stock unit vesting event.

How many Solid Power (SLDP) shares does Joshua Buettner-Garrett hold after this transaction?

After the tax-withholding disposition, Joshua Buettner-Garrett directly holds 1,366,018 Solid Power common shares. This figure reflects his remaining ownership position following the surrender of 33,824 shares to satisfy the tax liability arising from restricted stock unit vesting.

Was this Solid Power (SLDP) insider transaction an open-market sale?

No, this was not an open-market sale. The 33,824 shares were automatically withheld by Solid Power to pay Joshua Buettner-Garrett’s tax obligations on vested restricted stock units, a routine administrative transaction rather than a discretionary stock sale.