Joe Mastrangelo, Chief Executive Officer and Director of Eos Energy Enterprises, Inc. (EOSE), filed a Form 4 on August 6, 2026, disclosing the exercise of subscription rights and acquisition of common stock and warrants on July 21, 2026, in connection with the company's rights offering.

Key Highlights

  • Transaction date: July 21, 2026, coinciding with the close of Eos Energy's rights offering.
  • Common stock acquired: 111,118 shares acquired via transaction code M at a price of $5.48 per share.
  • Post-transaction ownership: Mastrangelo directly beneficially owned 2,058,704 shares of common stock following the transaction.
  • Warrants retained: 48,758 warrants to purchase common stock at $5.48 per share remain outstanding after the transaction, directly held.
  • Warrant terms: According to the filing, the warrants became exercisable immediately after the rights offering closed and expire 10 years later, unless exercised or redeemed earlier.
  • Filing signed: Sumeet Puri signed as attorney-in-fact for Joe Mastrangelo on August 6, 2026.

Mastrangelo's Rights Offering Participation at Eos Energy Enterprises

According to the filing, the transaction reported represents the conversion of a subscription right issued by Eos Energy Enterprises, Inc. as part of a rights offering that closed on July 21, 2026. The filing states that each subscription right was exercisable for units consisting of one share of common stock and 0.4388 of a warrant exercisable to acquire a share of common stock at an exercise price of $5.48 per share.

Mastrangelo, who serves as both Chief Executive Officer and Director of the company, exercised 111,118 subscription rights, resulting in the acquisition of 111,118 shares of common stock at $5.48 per share. The exercise also generated 48,758 warrants, each with an exercise price of $5.48 per share, which the filing identifies as directly held. The derivative securities table shows that both the subscription rights and the associated warrants carried transaction code M, indicating exercise of derivative securities.

Following these transactions, the filing reports that Mastrangelo directly beneficially owned 2,058,704 shares of common stock. The filing notes that the 48,758 warrants became exercisable immediately after the rights offering closed and expire 10 years later unless exercised or redeemed earlier, and that "if a warrant is not exercised or redeemed before it expires, it will have no value." The issuer is identified in the filing as Eos Energy Enterprises, Inc., trading under the ticker EOSE.

What Was Disclosed

The Form 4 discloses that CEO Joe Mastrangelo acquired 111,118 shares of common stock and 48,758 warrants through the exercise of subscription rights in Eos Energy's rights offering that closed July 21, 2026, bringing his direct beneficial ownership to 2,058,704 shares.