William P. Donnelly

Filings by William P. Donnelly span 4 companies, the busiest being Mettler Toledo International Inc/, Quanterix Corp and Price T Rowe Group Inc. In total, 66 filings cover trades dated from 8 February 2016 to 1 October 2026.

In open-market terms, that means 4 purchases worth €1.2M on one side and 13 sales on the other. The amount is not disclosed for 13 filings. Unlike grants, an open-market purchase is paid for by the insider, at the market price. The rest of the record consists of 29 share grants and 19 option exercises. So far in 2026, the count stands at 2 purchases and no sales.

The median purchase comes to €313k. Clusters matter here: 1 out of 4 purchases overlapped with buying by a colleague within 30 days. Such overlaps are known as a cluster signal: distinct people reaching the same decision at about the same time.

On 2 October 2026 came the latest disclosure, a share grant for €21k in Quanterix Corp. The clock since the last published purchase (14 August 2026) now reads 64 days. 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. Selling is not necessarily a view on the stock: liquidity needs and diversification are common motives. Source: insider filings from SEC (Form 4). Past trades are no guide to future returns.