Michelle Buczkowski, Chief Commercial Officer of Eos Energy Enterprises, Inc. (NASDAQ:EOSE), filed a Form 4 on October 29, 2026, reporting the vesting of 100,000 restricted stock units and the subsequent sale of 50,000 shares of common stock on October 28-29, 2026.

Key Highlights

  • RSU conversion: 100,000 restricted stock units were converted to common stock on October 28, 2026, at a price of $0, per the filing.
  • Shares sold: 50,000 shares of common stock were disposed of on October 29, 2026, at a weighted average price of $2, with individual transactions ranging from $1.88 to $2.07, inclusive.
  • 10b5-1 plan: The sale was executed automatically under a Rule 10b5-1 trading plan adopted by Buczkowski on December 11, 2025, to cover estimated tax withholding obligations related to RSU vesting.
  • Remaining ownership: Following both transactions, Buczkowski directly beneficially owned 111,827 shares of common stock, according to the filing.
  • RSU grant terms: The filing states the RSUs were granted under the issuer's 2020 Incentive Plan and vest in three installments on each of the first three anniversaries of the grant date, subject to continued service.

RSU Vesting and Planned Share Sale by Eos Energy's Chief Commercial Officer

According to the Form 4 filed with the SEC, Michelle Buczkowski, serving as Chief Commercial Officer of Eos Energy Enterprises, Inc., reported two transactions involving the company's common stock. On October 28, 2026, 100,000 restricted stock units were converted (transaction code M) into 100,000 shares of common stock at a price of $0. Each RSU, the filing notes, "represents a contingent right to receive one share of common stock."

The following day, October 29, 2026, Buczkowski disposed of 50,000 shares (transaction code S) at a weighted average price of $2 per share. The filing discloses that these shares were sold in multiple transactions at prices ranging from $1.88 to $2.07, inclusive, and that Buczkowski undertakes to provide full information on the number of shares sold at each separate price upon request. The filing confirms the sale was carried out automatically under a Rule 10b5-1 trading plan that Buczkowski adopted on December 11, 2025, specifically to cover estimated tax withholding obligations arising from the RSU vesting.

The RSU grant underlying these transactions was made under the issuer's 2020 Incentive Plan, with vesting scheduled in three equal installments on each of the first three anniversaries of the grant date, contingent on continued service. Following both reported transactions, Buczkowski's direct beneficial ownership stood at 111,827 shares of common stock, with 100,000 RSUs remaining, as reported in the filing. The Form 4 was signed by Sumeet Puri as attorney-in-fact for Michelle Buczkowski on October 29, 2026.

What Was Disclosed

Eos Energy Enterprises Chief Commercial Officer Michelle Buczkowski filed a Form 4 reporting the October 28-29, 2026 vesting of 100,000 RSUs and the Rule 10b5-1 plan sale of 50,000 shares, leaving her with direct beneficial ownership of 111,827 shares.