Bradford T. Whitmore and affiliated entities filed Amendment No. 11 to their Schedule 13D on October 29, 2026, disclosing beneficial ownership of 6,708,835 shares of Ultralife Corporation common stock, representing 40.3% of the class, following share purchases made between May 21, 2026 and May 26, 2026.

Key Highlights

  • Aggregate beneficial ownership: Bradford T. Whitmore reported total beneficial ownership of 6,708,835 shares, equal to 40.3% of Ultralife Corporation common stock.
  • Sole power: Whitmore holds sole voting and dispositive power over 205,915 shares.
  • Shared power: Whitmore holds shared voting and dispositive power over 6,502,920 shares through Whitmore Holdings, LLC and SUNRAY I, LLC via Zistar Management, LLC.
  • SUNRAY I, LLC position: SUNRAY I, LLC reported sole voting and dispositive power over 4,452,283 shares, representing 26.7% of the class.
  • Whitmore Holdings, LLC position: Whitmore Holdings, LLC reported sole voting and dispositive power over 2,050,637 shares, representing 12.3% of the class.
  • Recent purchases: Whitmore Holdings, LLC purchased a total of 108,878 shares of common stock between May 21, 2026 and May 26, 2026, according to the filing.
  • Source of funds: The filing states all common stock was purchased with working capital.

Whitmore Group's Expanding Position in Ultralife Corporation

The Schedule 13D amendment, identified as Amendment No. 11, was triggered by an event dated October 27, 2026, and updates a filing most recently amended on March 16, 2026. The five reporting persons, collectively referred to in the filing as the "Filers," are Bradford T. Whitmore, SUNRAY I, LLC (a Delaware limited liability company), Whitmore Holdings, LLC (a Tennessee limited liability company), Zistar Management, LLC (a Tennessee limited liability company), and Bradford Whitmore Trust (a trust formed under the laws of the State of Tennessee). According to the filing, Whitmore serves as the sole trustee of Bradford Whitmore Trust and as the manager of both Whitmore Holdings, LLC and Zistar Management, LLC.

The filing discloses that Whitmore Holdings, LLC purchased a total of 108,878 shares of Ultralife Corporation common stock between May 21, 2026 and May 26, 2026, subsequent to the prior Schedule 13D amendment. The shares beneficially owned by the Filers were acquired using working capital, as stated in the filing. Bradford Whitmore Trust reported shared voting and dispositive power over 6,502,920 shares, representing 39.0% of the class, in its capacity as the sole member of Whitmore Holdings, LLC and the sole member of Zistar Management, LLC.

Zistar Management, LLC reported sole voting and dispositive power over 4,452,283 shares, equal to 26.7% of the class, in its capacity as manager of SUNRAY I, LLC, which is the direct holder of those shares. The filing states that Ultralife Corporation's principal executive offices are located at 2000 Technology Parkway, Newark, New York, 14513, and that the issuer's common stock carries a par value of $0.10 per share (CUSIP: 903899102). The filing does not name an exchange or ticker symbol in the cover page securities table.

What Was Disclosed

Amendment No. 11 to this Schedule 13D updates the Whitmore group's beneficial ownership in Ultralife Corporation common stock to 6,708,835 shares (40.3%), reflecting share purchases by Whitmore Holdings, LLC in May 2026 and reorganized ownership reporting across five affiliated reporting persons.