James N. Topper

Filings by James N. Topper span 3 companies, the busiest being NewAmsterdam Pharma Co N.V., Phathom Pharmaceuticals, Inc. and Alpine Immune Sciences, Inc. Between 25 May 2023 and 15 September 2025, the trades on record add up to 17 filings.

The open-market record is one-sided, with 11 purchases worth €617k and not one sale. Unlike grants, an open-market purchase is paid for by the insider, at the market price. The rest of the record consists of 5 share grants. 2025 to date brings 10 purchases and no sales.

The median purchase comes to €27k. On 3 out of 11 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.

On 17 September 2025 came the latest disclosure, an open-market purchase for €13k in NewAmsterdam Pharma Co N.V. Between a trade and the moment it shows up on SEC (Form 4), the median delay is 2 days. Section 16 rules allow two business days to file each Form 4. These figures are compiled from regulatory filings published by SEC (Form 4). They describe what insiders did and are not a recommendation.