Solid Power (SLDP) director receives 44,133 RSUs, now holds 320,203 shares directly

Rhea-AI Filing Summary

STEPHENS JOHN JOSEPH reported acquisition or exercise transactions in this Form 4 filing.

Solid Power, Inc. director John Joseph Stephens reported an equity award of 44,133 shares of common stock in the form of restricted stock units (RSUs). The RSUs carry a grant price of $0.00 per share and increase his directly held position to 320,203 shares of common stock.

Each RSU represents the right to receive one share of Solid Power common stock upon vesting. The units vest on the earlier of the first anniversary of the grant date or the day before the company’s next annual meeting of stockholders, provided he continues as a service provider under the 2021 Equity Incentive Plan.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider STEPHENS JOHN JOSEPH

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	44,133	$0.00	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 320,203 shares (Direct, null); Common Stock — 300,005 shares (Indirect, By LP)

Footnotes (1)

1. [object Object]

Key Figures

RSU grant size: 44,133 shares Grant price: $0.00 per share Direct holdings after grant: 320,203 shares +1 more

4 metrics

RSU grant size 44,133 shares Restricted stock units of common stock granted to director

Grant price $0.00 per share Stated price per restricted stock unit

Direct holdings after grant 320,203 shares Common stock directly held following the RSU award

Indirect holdings by LP 300,005 shares Common stock held indirectly through a limited partnership

Key Terms

restricted stock units, annual meeting of stockholders, 2021 Equity Incentive Plan

3 terms

restricted stock units financial

"Represents restricted stock units, which upon vesting of the unit, represent the right to receive one share"

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.

annual meeting of stockholders financial

"vest upon the earlier of: (i) the first anniversary of the grant date or (ii) the day before the issuer's next annual meeting of stockholders"

2021 Equity Incentive Plan financial

"subject to the reporting person continuing to be a service provider (as defined in the Solid Power, Inc. 2021 Equity Incentive Plan)"

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^*

STEPHENS JOHN JOSEPH

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/20/2026

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	05/20/2026		A		44,133(1)	A	$0	320,203	D
Common Stock								300,005	I	By LP

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 restricted stock units, which upon vesting of the unit, represent the right to receive one share of the issuer's common stock. The restricted stock units vest upon the earlier of: (i) the first anniversary of the grant date or (ii) the day before the issuer's next annual meeting of stockholders following the grant date, in each case, subject to the reporting person continuing to be a service provider (as defined in the Solid Power, Inc. 2021 Equity Incentive Plan) through such vesting date.

	/s/ Kristen Gould, attorney-in-fact on behalf of John J. Stephens	05/21/2026
	** 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) director John Joseph Stephens report on this Form 4?

John Joseph Stephens reported an award of 44,133 restricted stock units of Solid Power common stock. These RSUs were granted at $0.00 per unit and increase his directly held common stock position, reflecting compensation rather than an open-market share purchase or sale.

How many Solid Power (SLDP) shares does John Joseph Stephens hold after this RSU grant?

After the RSU grant, John Joseph Stephens directly holds 320,203 shares of Solid Power common stock. He also has an indirect holding of 300,005 shares through a limited partnership, giving him substantial overall equity exposure as reflected in this Form 4.

What are the vesting terms of the 44,133 restricted stock units at Solid Power (SLDP)?

The 44,133 restricted stock units vest on the earlier of the first anniversary of the grant date or the day before Solid Power’s next annual stockholders’ meeting. Vesting requires Stephens to remain a service provider under the company’s 2021 Equity Incentive Plan through that date.

Are the reported Solid Power (SLDP) restricted stock units an open-market purchase?

No. The 44,133 units are a grant of restricted stock units, not an open-market purchase. They were awarded at a stated price of $0.00 per unit as equity compensation, with actual shares delivered only if the vesting conditions are satisfied.

What does the indirect ownership by LP mean in the Solid Power (SLDP) Form 4?

The filing shows 300,005 Solid Power common shares held indirectly “By LP,” indicating ownership through a limited partnership. This distinguishes those shares from the 320,203 directly held shares, clarifying the structure of Stephens’ overall beneficial interest in the company.