William P. Scully

William P. Scully is a declared insider at 2 companies; the most frequent names are Prothena CORP Public Ltd Co and Yield10 Bioscience, Inc. The record holds 18 filings, for trades running from 10 September 2015 to 14 October 2026.

Every open-market trade on record is a purchase: 14 purchases worth €6.8M, and no sale. The amount is not disclosed for 2 filings. A purchase on the market is a deliberate choice to commit personal money, which is why it draws more attention than a grant. In 2026 alone, the filings show 12 purchases and no sales.

Half of the purchases are above €711k and half below. Relative to company size, the median is 0.18% of market cap (12 purchases with a known value). No cluster: in 14 purchases, no other insider of the company bought within 30 days.

The newest entry dates from 15 October 2026: an open-market purchase of €748k, in Prothena CORP Public Ltd Co. Between a trade and the moment it shows up on SEC (Form 4), the median delay is 2 days. US insiders must file a Form 4 within two business days of a trade. This summary is built from SEC (Form 4) disclosures alone and does not predict where the share price will go.