HeartSciences Inc. filed Definitive Additional Materials on Schedule 14A on October 28, 2026, transmitting a social media post published by Fortitude Mining Holdings, Inc. in connection with the companies' proposed all-stock merger.

Key Highlights

  • Filing type: Definitive Additional Materials (DEFA14A) submitted by HeartSciences Inc. (NASDAQ:HSCS) on October 28, 2026.
  • Transaction structure: HeartSciences and Fortitude Mining Holdings, Inc. have entered into a definitive merger agreement to combine in an all-stock transaction, according to the filing.
  • Parties described: The filing characterizes Fortitude as "a vertically-integrated digital asset mining platform anchored in Zcash" and HeartSciences as "an AI-powered medical technology company."
  • Proxy already filed: HeartSciences filed a definitive proxy statement on Schedule 14A with the SEC on October 19, 2026, in connection with the Proposed Transaction.
  • Zcash monetization disclosed: The filing states that Fortitude "currently sells or otherwise monetizes all the digital assets that it mines, including ZEC," and that funds are used for operating expenses, capital investments, hedging, and other purposes.
  • DCG involvement noted: Certain executive officers of Digital Currency Group, Inc. ("DCG") may be deemed participants in the proxy solicitation, according to the filing.

HeartSciences and Fortitude: Two Distinct Businesses Pursuing a Merger

According to the filing, HeartSciences is an AI-powered medical technology company listed on Nasdaq under the symbol HSCS. The company is proposing to combine with Fortitude Mining Holdings, Inc., a digital asset mining platform that the filing describes as anchored in Zcash (ZEC). The proposed transaction is structured as an all-stock combination, and HeartSciences shareholders are expected to vote on it at a special meeting.

The DEFA14A filing transmits a social media post made by Fortitude in connection with the proposed merger. Such filings are commonly used to bring additional communications under the umbrella of SEC-registered proxy solicitation materials. The filing notes that HeartSciences mailed the definitive proxy statement and a proxy card to eligible shareholders, and that the definitive proxy statement was filed on October 19, 2026. HeartSciences' most recent Annual Report on Form 10-K was filed with the SEC on July 23, 2026, and its Quarterly Report on Form 10-Q for the fiscal quarter ended July 31, 2026, was filed on September 14, 2026.

The filing includes disclosures about Fortitude's business practices, stating that Fortitude and its affiliates and subsidiaries, including DCG, "from time to time sell, pledge or otherwise monetize their digital asset holdings, including ZEC," with proceeds used to fund operating expenses, capital investments, hedging, and investment activities. The filing also identifies several categories of risk attached to the proposed transaction, including the "highly volatile nature of the price of Zcash and other cryptocurrencies," regulatory uncertainty regarding digital assets, integration risk, and the possibility that required shareholder approval may not be obtained.

What Was Disclosed

HeartSciences filed supplemental proxy materials on October 28, 2026, transmitting a Fortitude social media post related to their proposed all-stock merger. The filing references the definitive proxy statement already submitted on October 19, 2026, and identifies key transaction risks and participant information.