William Mariner Greenman

Filings by William Mariner Greenman span 2 companies, the busiest being Cerus Corp and Chinook Therapeutics, Inc. Over a trading history stretching from 30 September 2016 to 12 March 2026, the count stands at 48 filings.

In open-market terms, that means 1 purchase worth €41k on one side and 14 sales worth €1.7M on the other. The net balance comes to €1.6M on the selling side. A purchase on the market is a deliberate choice to commit personal money, which is why it draws more attention than a grant. Besides market trades, the filings include 5 share grants and 27 option exercises. So far in 2026, the count stands at no purchases and 1 sale.

On 16 March 2026 came the latest disclosure, an open-market sale for €643k in Cerus Corp. The last purchase on record was published on 4 June 2019, which is 2,696 days ago. Filings reach the SEC (Form 4) feed a median of 2 days after the trade. For comparison, the SEC allows two business days to file a Form 4. Keep in mind that insiders sell for many reasons unrelated to the outlook, from tax bills to estate planning. These figures are compiled from regulatory filings published by SEC (Form 4). They describe what insiders did and are not a recommendation.