American Bitcoin Corp. filed a Form 8-K on August 3, 2026, disclosing the departure of President and Interim Chief Financial Officer Matthew Prusak and the appointment of Paul Sacks as Interim Chief Financial Officer, both effective August 4, 2026.

Key Highlights

  • New Interim CFO: Paul Sacks, currently Head of Derivatives at American Bitcoin Corp., was appointed Interim Chief Financial Officer by the Board of Directors on July 31, 2026.
  • Effective Date: Both the appointment of Sacks and the departure of Matthew Prusak take effect on August 4, 2026.
  • No Compensation Change: According to the filing, Sacks will serve in the Interim CFO role with no change to his existing compensation or benefits.
  • Prusak Departure: Matthew Prusak voluntarily stepped down as President and Interim Chief Financial Officer to pursue a position in Austin, Texas.
  • No Disagreement on Record: The filing states Prusak's resignation was not the result of any disagreement with the company on any matter relating to its financial statements, operations, policies, or practices.
  • Indemnification Agreement: In connection with Sacks's appointment as an executive officer, the company entered into an indemnification agreement with him based on a form previously filed on September 3, 2025.

Leadership Transition at American Bitcoin Corp., a Nasdaq-Listed Bitcoin Mining Company

American Bitcoin Corp. ( Nasdaq : ABTC), a Delaware-incorporated company headquartered at 777 Brickell Avenue, Suite 200, Miami, Florida, disclosed a senior leadership change under Item 5.02 of its Form 8-K filed August 3, 2026. The company reported that its Board of Directors appointed Paul Sacks, age 53, as Interim Chief Financial Officer effective August 4, 2026. Sacks will continue to hold his existing role as Head of Derivatives, a position he has held at the company since May 2026, and according to the filing, his compensation and benefits will remain unchanged in connection with the additional appointment.

The filing outlines Sacks's professional background in detail. Before joining American Bitcoin Corp., he served as Co-Head of Digital Exotics at BlockFills from November 2022 to March 2026. Prior to that role, he was a Co-Founder and Managing Member of Digital Gamma from January 2017 to November 2022. He holds a Bachelor of Business Administration from the University of Massachusetts Amherst. The filing also confirms there are no family relationships between Sacks and any director or executive officer of the company, and that he has no direct or indirect material interest in any transaction required to be disclosed under Item 404(a) of Regulation S-K.

On July 30, 2026, Matthew Prusak notified the company of his voluntary resignation from the roles of President and Interim Chief Financial Officer, citing a desire to pursue a position in his hometown of Austin, Texas. The company stated in the filing that Prusak's departure was not connected to any disagreement over financial statements, operations, policies, or practices. Michael Ho, Chief Executive Officer, signed the 8-K on behalf of the registrant.

What Was Disclosed

The filing reported the voluntary resignation of Matthew Prusak as President and Interim CFO and the Board's appointment of Paul Sacks to the Interim CFO role, both effective August 4, 2026, with Sacks retaining his Head of Derivatives position and existing compensation terms.