Heller Linda C. 4

What Happened

• Linda C. Heller, Solid Power’s Chief Financial Officer, Treasurer & Secretary, received a grant of 380,348 restricted stock units (RSUs) on 2026-04-01 (reported as an acquisition/award). The RSUs were reported at $0.00 for accounting on the Form 4.
• On 2026-03-31, 26,659 shares were withheld to satisfy tax withholding upon vesting (reported as a disposition at $2.82 per share, totaling $75,178). The withholding is a routine tax-fulfillment transaction, not an open-market sale.

Key Details

• Transaction dates and prices:
  • 2026-03-31: 26,659 shares withheld for taxes at $2.82/share (Disposition) — $75,178.
  • 2026-04-01: 380,348 RSUs granted (Acquisition/Award) reported at $0.00.
• Shares owned after the transactions: Not disclosed on the filing.
• Footnotes of note:
  • F1: The 26,659 shares were withheld to satisfy the reporting person’s tax obligation upon vesting (tax withholding, not a market sale).
  • F2: Each RSU represents a contingent right to one share; the RSUs vest in 16 equal quarterly installments beginning June 30, 2026, subject to continued service.
• Filing timeliness: Form 4 was filed 2026-04-02 and is not marked as late on the face of the filing.

Context

• RSU grants are an award of future shares that vest over time and are commonly used for executive compensation; they are not immediate market purchases. The tax-withholding disposition is a routine administrative step and does not by itself indicate insider sentiment about the company’s stock price.