Stock-Based Compensation

3 Months Ended

Mar. 31, 2026

Stock-Based Compensation

Stock-Based Compensation

Note 9 – Stock-Based Compensation

There have been no changes to the Solid Power, Inc. 2014 Equity Incentive Plan (the “2014 Plan”), the Solid Power, Inc. 2021 Equity Incentive Plan (the “2021 Plan”), the Solid Power, Inc. 2021 Employee Stock Purchase Plan (“ESPP”), the Company’s accounting for stock-based compensation under those plans, or the restricted stock grants to two Dahae executives, as disclosed in the 2025 Form 10-K.

The fair value of stock options and RSUs under the 2021 Plan is recognized as compensation expense over the vesting period of the award. The Company accounts for forfeitures as they occur.

For the three months ended March 31, 2026 and 2025, the Company recognized compensation costs totaling:

	Three Months Ended March 31,
	2026		2025
Stock-based compensation costs related to RSUs	$	2,209	$	1,053
Stock-based compensation costs related to stock options		375		724
Stock-based compensation costs related to the ESPP		122		53
Total stock-based compensation costs	$	2,706	$	1,830

Unrecognized future compensation costs as of March 31, 2026 were $19,677. The Company expects to recognize the future compensation cost over a weighted-average period of 2.7 years, amortized over a straight-line basis.

The following table summarizes the Company’s award activity for RSUs and stock options for the three months ended March 31, 2026:

	RSUs	Stock Options
Balance at December 31, 2025	13,328,190	12,320,074
Granted	65,325	—
Vested or Exercised	(572,465)	(42,494)
Forfeited	(39,896)	—
Expired	—	—
Balance at March 31, 2026	12,781,154	12,277,580

Restricted Stock Grants to Dahae Executives

On October 21, 2024, the Company issued 298,508 shares of restricted stock to two executive employees of Dahae pursuant to the provisions of Regulation S under the Securities Act of 1933, as amended. This issuance was not under any existing plan. The restricted stock vests over a four-year period, subject to forfeiture upon the applicable stockholder ceasing to provide services to Dahae or upon Dahae’s default on the financing instruments entered into between the Company and Dahae on October 21, 2024. As of March 31, 2026, 178,610 shares vested. Stock-based compensation expense is recognized within Share of net loss of equity method investee in the Condensed Consolidated Statements of Operations and Comprehensive Loss. No additional shares of restricted stock are authorized for issuance to Dahae executives.