Gregory l. Summe

This profile gathers the share dealings of Gregory l. Summe across 6 companies, led by Avantor, Inc., GRAIL, Inc. and NXP Semiconductors N.V. In total, 38 filings cover trades dated from 19 May 2021 to 15 October 2026.

On the open market, the record shows 7 purchases worth €3.9M and 2 sales worth €2.1M. Purchases outweigh sales by €1.8M. Open-market purchases are the filings investors watch most closely, because the insider pays for the shares out of pocket. Besides market trades, the filings include 24 share grants and 5 option exercises. 2026 to date brings 1 purchase and no sales.

A typical purchase (the median) is worth €332k. On 4 out of 7 purchases, another insider of the same company was buying within the same 30 days. Such overlaps are known as a cluster signal: distinct people reaching the same decision at about the same time. Looking at 7 purchases old enough to measure, the stock rose over the following 90 days in 29% of cases; the median change was -6.5%. These figures describe past trades and do not predict future prices.

The newest entry dates from 16 October 2026: a share grant of €29k, in GRAIL, Inc. The clock since the last published purchase (12 February 2026) now reads 248 days. Typically, a trade is published a median of 2 days after it takes place. US insiders must file a Form 4 within two business days of a trade. Source: insider filings from SEC (Form 4). Past trades are no guide to future returns.