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Form 8-K

sec.gov

8-K — Solid Power, Inc.

Accession: 0001104659-26-048631

Filed: 2026-04-24

Period: 2026-04-20

CIK: 0001844862

SIC: 3690 (MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES)

Item: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported):

April 20, 2026

Solid

Power, Inc.

(Exact Name of Registrant as Specified in Charter)

Delaware

001-40284

86-1888095

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(I.R.S. Employer

Identification Number)

486

S. Pierce Avenue, Suite E

Louisville, Colorado

80027

(Address of principal executive offices)

(Zip code)

(303) 219-0720

(Registrant’s telephone number, including

area code)

Not Applicable

(Former name or former address, if changed since

last report)

Check the appropriate box below if the Form 8-K filing is intended

to simultaneously satisfy the filing obligation of the Registrant under any of the following provisions:

¨ Written

communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting

material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement

communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement

communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading

Symbol(s)

Name of each exchange

on which registered

Common stock, par value $0.0001 per share

SLDP

The Nasdaq Stock Market LLC

Warrants, each whole warrant exercisable for one share of common stock at an exercise price of $11.50

SLDPW

The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth

company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405) or Rule 12b-2 of the Securities Exchange Act

of 1934 (§ 240.12b-2).

Emerging growth company ¨

If an emerging growth company, indicate

by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial

accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 5.02        Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On April 20, 2026, Rainer Feurer provided notice

to Solid Power, Inc. (the “Company”) of his intention to retire from the Company’s Board of Directors (the “Board”),

effective June 30, 2026. Dr. Feurer’s

decision to retire and step down from the Board was not the result of any disagreement on matters relating to the Company’s

operations, policies, or practices. The Company is grateful for Dr. Feurer’s valuable contributions to the Board over

the past five years and wishes him well.

SIGNATURE

Pursuant to the requirements of the Securities

Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

Dated: April 24, 2026

SOLID POWER, INC.

By:

/s/ Linda Heller

Name: Linda Heller

Title: Chief Financial Officer, Treasurer, and Secretary

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