David R. Walt

David R. Walt, listed as board member, has filed trades across 4 companies (mainly through SEC (Form 4)), most often in Illumina, Inc., Cerulean Pharma Inc. and Quanterix Corp. Between 4 January 2006 and 2 January 2026, the trades on record add up to 4,247 filings.

Both buying and selling appear: 49 purchases worth €10.2M, against 4,143 sales worth €91.8M. Taken together, the sales exceed the purchases by €81.5M. Unlike grants, an open-market purchase is paid for by the insider, at the market price. The rest of the record consists of 28 share grants and 17 option exercises.

A typical purchase (the median) is worth €10k. On 10 out of 45 purchases, another insider of the same company was buying within the same 30 days. Purchases made close together by different insiders form what is called a cluster.

Most recently, on 6 January 2026, the filings show a share grant in Quanterix Corp. The last insider purchase was made public on 13 June 2025, 498 days ago. Between a trade and the moment it shows up on SEC (Form 4), the median delay is 2 days. 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.