Summary
Updated Aug 30, 2026
James N. Topper files SEC Form 4 reports at Phathom Pharmaceuticals, Inc. (PHAT). 4 SEC Form 4 filings on record going back to 2025, most recently on 21 May 2026. Most recent open-market trade: bought $16K of NAMS on 17 September 2025. Lifetime open-market purchases: $58K. Historical track record: 5/5 stars across 3 tracked purchases.
Recent Transactions
4Every recent SEC Form 4 transaction James N. Topper has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies James N. Topper files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Michael H. Davidson - $25.33M of NAMS open-market activity in the last 12 months
- Louise Frederika Kooij - $21.08M of NAMS open-market activity in the last 12 months
- Johannes Jacob Pieter Kastelein - $14.26M of NAMS open-market activity in the last 12 months
- Mayur Ian Somaiya - $3.43M of NAMS open-market activity in the last 12 months
- Louis G. Lange - $2.19M of NAMS open-market activity in the last 12 months
- Robert Charles Breedlove - $13K of PHAT open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is James N. Topper?
James N. Topper is a corporate insider of Phathom Pharmaceuticals, Inc. (PHAT). InsiderAlpha holds 4 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did James N. Topper last file a Form 4?
The most recent primary Form 4 on record is dated 21 May 2026, one of 4 filings going back to 2025.
Has James N. Topper been buying or selling stock?
Recorded transactions: 3 open-market purchases ($58K) and 0 open-market sales across all tracked filings.
How accurate is James N. Topper's historical track record?
Across 3 tracked purchases, James N. Topper averaged +36.4% avg 30-day return with a 100% 30-day win rate. InsiderAlpha rates the track record at 5/5 stars.
Where can I see all of James N. Topper's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Follow James N. Topper and every insider like them
A free account opens the full scored daily plan and every past day, a watchlist for any ticker, and 3 months of price history on every company page. No card.
Free plan available · Paid plans start with a 7-day free trial
