M James Barrett has bought stock on 16 days since Jan 2016

Barrett M. James (often reported as M James Barrett) is a corporate insider and significant shareholder associated with Adaptimmune Therapeutics Plc (ADAP), where he has disclosed beneficial ownership at or above the 10% threshold through large purchases of ordinary shares.( In March 2018, SEC-reported insider trading data show Barrett acquiring 6,000,000 Adaptimmune ordinary shares, a transaction that contributed to holdings of tens of millions of shares, consistent with a 10% owner status.( Public filings from Adaptimmune reference M. James Barrett in connection with major shareholder transactions since January 1, 2017, further confirming his role as a substantial, non-executive investor rather than an operating company.(

Beyond Adaptimmune, Barrett appears across SEC and market-tracking databases as a high-net-worth individual insider, with an estimated net worth of approximately $7.75 million based on reported share ownership across multiple companies.( GuruFocus identifies him as director and 10% owner of Senseonics Holdings Inc., a medical technology company, underscoring his broader involvement in the life-sciences sector as a major shareholder and board-level participant.( Regulatory records list his SEC Central Index Key (CIK) as 0001219855 and a mailing address in Baltimore, Maryland, consistent with U.S.-based individual investor status.( No widely sourced public information details his formal education or earlier career outside these investment and directorship roles.(

Written by Perplexity from public sources.