ANDERSON ERIK J 4

What Happened

• Erik J. Anderson, a director of Solid Power, was granted 44,133 restricted stock units (RSUs) on 2026-05-20. The award was reported as an "A" (award/grant) at an acquisition price of $0.00 (no cash exchanged). These are RSUs that convert to one share each upon vesting.

Key Details

• Transaction date: 2026-05-20; filing date: 2026-05-21 (filed the next day).
• Instrument and amount: 44,133 RSUs granted; reported price $0.00; transaction code A = award/grant.
• Shares owned after transaction: the filing shows 157,617 shares owned directly by WestRiver Management, of which Anderson is the sole member/manager (see footnote F2). The granted RSUs are unvested and not listed as currently owned shares.
• Vesting (footnote F1): RSUs vest on the earlier of (i) the first anniversary of the grant date or (ii) the day before the issuer’s next annual meeting following the grant date, subject to continued service.
• Timeliness: filing appears timely (reported one day after the transaction).

Context

• RSUs are a deferred equity award that convert to common shares upon vesting; this grant does not involve an immediate purchase or sale and therefore is neither a direct bullish nor bearish market action. The grant increases potential future ownership if Anderson remains a service provider through the vesting conditions.