Peter W. Sonsini has bought stock on 29 days since Jan 2016

Peter W. Sonsini is a individual corporate insider and large biotechnology investor who has reported significant beneficial ownership positions in multiple public life sciences and healthcare companies, including Genocea Biosciences, Inc. (GNCA), where he filed as a 10% owner in 2022.( SEC Form 4 filings show Sonsini as a large shareholder in Genocea Biosciences, with reported sales of more than 10 million shares in May 2022, reflecting his role as a major outside investor rather than an executive officer of the company.( He has also reported substantial ownership stakes—often at or above the 10% threshold—in a broad portfolio of therapeutics and healthcare issuers such as Mirum Pharmaceuticals, Trevi Therapeutics, AVEO Pharmaceuticals, and others, highlighting his prominence as a life sciences investor and beneficial owner across dozens of public companies.(

Ownership and trading data compiled from SEC filings indicate that Sonsini is the reporting owner for interests in more than 50 companies, spanning therapeutics, medical devices, and healthcare services.( In at least some positions, he files jointly or in a fiduciary capacity—for example, as trustee of the Louisa Marie Sonsini Trust, demonstrating that part of his role involves managing or overseeing significant family or trust holdings in public equities.( Publicly available regulatory and trading records focus on his status as a major shareholder and do not provide detailed information about his professional operating role, career history, or education; however, they consistently identify him as an individual investor and insider, not as a corporate entity.(

Written by Perplexity from public sources.