Solid Power director granted 44,133 stock units

Goldberg Steven H reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Goldberg Steven H reported acquisition or exercise transactions in this Form 4 filing.

Solid Power, Inc. director Steven H. Goldberg received an award of 44,133 stock units of common stock on May 20, 2026. These units were granted at no cash cost and increase his direct holdings to 162,941 shares and units after the transaction.

The stock units each represent the right to receive one share of common stock upon vesting. They vest on the earlier of the first anniversary of the grant date or the day before Solid Power’s next annual stockholder meeting, as long as Goldberg continues as a service provider. He has elected to defer settlement under the company’s Directors' Deferred Equity Compensation Plan.

Insider Trade Summary

Grant/Award: 44,133 shares

Grant/Award 1 txn

Insider Goldberg Steven H

Role Director

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

Holdings After Transaction: Common Stock — 162,941 shares (Direct)

Footnotes (1)

1. F1. Represents stock units, which upon vesting of the unit, represent the right to receive one share of the issuer's common stock. The 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. The reporting person has elected to defer settlement pursuant to the Solid Power, Inc. Directors' Deferred Equity Compensation Plan.

Key Figures

Stock units granted: 44,133 stock units Grant price per unit: $0.0000 per unit Holdings after transaction: 162,941 shares and units

3 metrics

Stock units granted 44,133 stock units Award to director Steven H. Goldberg on May 20, 2026

Grant price per unit $0.0000 per unit Director stock unit award, non-cash compensation

Holdings after transaction 162,941 shares and units Total direct position following the grant

Key Terms

stock units, Solid Power, Inc. 2021 Equity Incentive Plan, Directors' Deferred Equity Compensation Plan, service provider

4 terms

stock units financial

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

Stock units are individual pieces of ownership in a company, like slices of a pie that together make up the whole business. They matter to investors because each unit represents a claim on the company’s assets, profits and sometimes voting power, and changes in the number or value of these units affect ownership percentages, potential dividends and share dilution — all of which influence an investment’s worth.

Solid Power, Inc. 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)"

Directors' Deferred Equity Compensation Plan financial

"The reporting person has elected to defer settlement pursuant to the Solid Power, Inc. Directors' Deferred Equity Compensation Plan"

service provider financial

"subject to the reporting person continuing to be a service provider through such vesting date"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did SLDP director Steven H. Goldberg report?

Steven H. Goldberg reported receiving 44,133 stock units of Solid Power common stock as a grant. The units were awarded at no cash cost and are part of his director compensation, increasing his direct holdings to 162,941 shares and units after the transaction.

How many Solid Power (SLDP) shares does Steven H. Goldberg hold after this Form 4/A?

After the grant, Steven H. Goldberg holds 162,941 shares and stock units of Solid Power common stock directly. This total includes the newly awarded 44,133 stock units reported in the Form 4/A insider filing dated May 20, 2026.

What are the vesting terms for Steven H. Goldberg’s 44,133 SLDP stock units?

The 44,133 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 Goldberg to continue as a service provider under the company’s 2021 Equity Incentive Plan through the vesting date.

Did Steven H. Goldberg pay cash for the 44,133 SLDP stock units?

No, Goldberg did not pay cash for these stock units; they were granted at a price of $0.0000 per unit. This indicates a compensation-related equity award rather than an open-market purchase of Solid Power common stock.

How will Steven H. Goldberg’s SLDP stock units be settled once vested?

Each vested stock unit represents the right to receive one share of Solid Power common stock. Goldberg has elected to defer settlement under the company’s Directors' Deferred Equity Compensation Plan, meaning actual share delivery will occur according to that plan’s deferral terms.

What plan governs Steven H. Goldberg’s new Solid Power stock unit grant?

The stock unit grant is made under the Solid Power, Inc. 2021 Equity Incentive Plan. Settlement is deferred pursuant to the Solid Power, Inc. Directors' Deferred Equity Compensation Plan, which governs when vested units are converted into delivered shares of common stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/21/2026 - 08:11 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^*

Goldberg Steven H

(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)
05/21/2026

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	162,941	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 stock units, which upon vesting of the unit, represent the right to receive one share of the issuer's common stock. The 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. The reporting person has elected to defer settlement pursuant to the Solid Power, Inc. Directors' Deferred Equity Compensation Plan.

Remarks:

This amendment is being filed to clarify that the reporting person received stock units pursuant to the Solid Power, Inc. Directors' Deferred Equity Compensation Plan.

	/s/ Kristen Gould, attorney-in-fact on behalf of Steven H. Goldberg	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)