Heller Linda C. 4

What Happened
Linda C. Heller, Solid Power's Chief Financial Officer, Treasurer and Secretary, had 72,310 shares of the issuer's common stock withheld to satisfy tax obligations upon the vesting of restricted stock units. The withholding was at $2.60 per share, representing roughly $188,006 in value. This is a tax-withholding disposition (not an open-market sale or purchase).

Key Details

• Transaction date: 2026-06-30; filing date: 2026-07-01.
• Price per share: $2.60; total value withheld: ~$188,006.
• Transaction code: F — payment of tax liability via share withholding.
• Footnote: F1 — shares withheld to satisfy the reporting person's tax obligation upon RSU vesting.
• Shares owned after the transaction: not disclosed in the provided filing.

Context
Share withholding to cover taxes on vested RSUs is a routine administrative action and differs from an open-market sale. It reduces the insider's outstanding shares but does not necessarily indicate a change in the insider's market view. The Form 4 was filed the day after the transaction; no late-filing indication appears in the provided record.