Hudson Bay Capital Management LP and Sander Gerber filed a Schedule 13G with the SEC on November 6, 2026, disclosing aggregate beneficial ownership of 30,568,009 shares of Eos Energy Enterprises, Inc. common stock, representing 7.75% of the class as of the September 30, 2026 triggering event.

Key Highlights

  • Beneficial ownership total: Hudson Bay Capital Management LP and Sander Gerber each reported beneficial ownership of 30,568,009 shares of Eos Energy Enterprises common stock.
  • Percentage of class: The reported position represents 7.75% of Eos Energy's outstanding common stock, par value $0.0001 per share.
  • Convertible component: According to the filing, 30,383,219 of the reported shares are issuable upon exchange of Frontier Units issued by Frontier Power USA Parent, LLC and upon exercise of warrants.
  • Share count basis: The 7.75% figure is calculated against 364,167,744 shares outstanding as of August 3, 2026, as reported in Eos Energy's quarterly report for the period ended June 30, 2026.
  • Voting and dispositive power: Both reporting persons reported zero sole voting or dispositive power, with all 30,568,009 shares held on a shared basis.
  • Triggering event date: The event requiring the filing occurred on September 30, 2026, according to the statement.
  • Gerber disclaimer: Sander Gerber, managing member of Hudson Bay Capital GP LLC, the general partner of the Investment Manager, "disclaims beneficial ownership of these securities," according to the filing.

Hudson Bay Capital's Reported Position in Eos Energy Enterprises

Hudson Bay Capital Management LP, a Delaware limited partnership headquartered at 290 Harbor Dr., Stamford, CT 06902, filed the Schedule 13G jointly with Sander Gerber on November 6, 2026, disclosing a beneficial ownership position in Eos Energy Enterprises, Inc. (NASDAQ:EOSE), a Pittsburgh-based energy storage company whose principal offices are listed in the filing as Two Allegheny Center, Nova Tower 2, Pittsburgh, Pennsylvania 15212. The filing identifies the Investment Manager as an investment adviser and pooled investment fund manager, classified as type "IA, PN" in the statement.

According to the filing, the securities are held in the name of three entities for which Hudson Bay Capital Management LP serves as investment manager: Hudson Bay Master Fund Ltd., HT Investments MA LLC, and HBC MSF Capital Solutions Blocker II LLC. The Investment Manager is described as potentially deemed the beneficial owner of all shares held by those entities, including shares issuable upon warrant exercise and exchange of Frontier Units issued by Frontier Power USA Parent, LLC. Of the 30,568,009 total shares reported, the filing notes that 30,383,219 consist of shares issuable through those instruments rather than shares held outright.

The filing states that the securities "were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer." Sander Gerber signed on behalf of both the Investment Manager and himself individually, with both signatures dated November 6, 2026. The two reporting persons also filed a joint acquisition statement as Exhibit 99.1.

What Was Disclosed

Hudson Bay Capital Management LP and Sander Gerber reported combined beneficial ownership of 30,568,009 shares, equal to 7.75% of Eos Energy Enterprises common stock, with the majority of that position consisting of shares issuable upon conversion of Frontier Units and warrant exercise, as of the September 30, 2026 event date.