Whetstone/Atterbury amend 8.6% stake in Sera Prognostics (NASDAQ: SERA)
Whetstone Capital Advisors, LLC and David Atterbury have amended their stake in Sera Prognostics (NASDAQ: SERA), now reporting beneficial ownership of 3,306,889 shares of Class A Common Stock, which represents 8.6% of the class. This update was disclosed in a Schedule 13G/A filing with the SEC, indicating shared voting and dispositive power over these shares. The filing, signed on May 1, 2026, reflects a passive investment and transparency regarding their holdings.