Gregory K. Chow

Gregory K. Chow is a declared insider at 2 companies; the most frequent names are Aptose Biosciences Inc. and Sutro Biopharma, Inc. We count 8 filings; the first trade dates from 13 March 2019 and the latest from 2 June 2026.

The open-market side counts 4 purchases for €49k alongside 1 sale for €679k. Sales outweigh purchases by €630k. Unlike grants, an open-market purchase is paid for by the insider, at the market price. Other entries cover 2 share grants and 1 option exercise.

In size, the median ticket on the buying side is €13k. On 1 out of 4 purchases, another insider of the same company was buying within the same 30 days. When several insiders buy within a few weeks of each other, analysts speak of a cluster purchase.

The record was last updated on 2 June 2026 with an option exercise in Sutro Biopharma, Inc. The latest purchase dates back some time: it was published 373 days ago, on 16 October 2025. Filings reach the SEC (Form 4) feed a median of 1 day after the trade. Section 16 rules allow two business days to file each Form 4. Every figure here comes from the filings published by SEC (Form 4) and describes the past, not future prices; it is not investment advice.