Alyeska Investment Group Reports New 5.15% Stake in ESS Tech, Inc. (GWH)

Alyeska Investment Group, L.P., along with Alyeska Fund GP, LLC and Anand Parekh, filed a Schedule 13G/A on May 15, 2026, reporting a 5.15% stake in ESS Tech, Inc. (GWH). As of the event date of March 31, 2026, the reporting persons beneficially own 1,400,000 shares of common stock. This represents a significant increase from a previously reported 0% ownership, crossing the 5% threshold required for beneficial ownership reporting. The shares are held by Alyeska Master Fund, L.P., with Alyeska Investment Group, L.P. serving as the investment manager. Anand Parekh, as CEO of Alyeska Investment Group, L.P., may be deemed to share voting and dispositive power over these shares, though he disclaims beneficial ownership. The filing indicates that the securities were acquired in the ordinary course of business and not for the purpose of changing or influencing control of the issuer. The calculation is based on 27,173,757 shares of common stock outstanding as of March 5, 2026.