Summary
Updated Aug 31, 2026
David O. Watson is General Counsel of Apellis Pharmaceuticals, Inc. (APLS). 14 SEC Form 4 filings on record going back to 2024, most recently on 14 May 2026. Most recent open-market trade: sold $170K of APLS on 23 January 2026. Lifetime open-market sales: $1.75M.
Recent Transactions
20Every recent SEC Form 4 transaction David O. Watson has reported, most recent first.
Trading Pattern
InsiderAlpha's records for David O. Watson go back to 2024: 14 primary Form 4 filings, an average of 4.7 per year. 5 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies David O. Watson 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.
- A. Sinclair Dunlop - $2.15M of APLS open-market activity in the last 12 months
- Timothy Eugene Sullivan - $1.84M of APLS open-market activity in the last 12 months
- Cedric Francois - $980K of APLS open-market activity in the last 12 months
- Nur Nicholson - $270K of APLS open-market activity in the last 12 months
- Pascal Deschatelets - $198K of APLS open-market activity in the last 12 months
- Caroline Baumal - $175K of APLS 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 David O. Watson?
David O. Watson is a corporate insider, tracked as General Counsel of Apellis Pharmaceuticals, Inc. (APLS). InsiderAlpha holds 14 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did David O. Watson last file a Form 4?
The most recent primary Form 4 on record is dated 14 May 2026, one of 14 filings going back to 2024.
Has David O. Watson been buying or selling stock?
Recorded transactions: 0 open-market purchases and 11 open-market sales ($1.75M) across all tracked filings.
Where can I see all of David O. Watson'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 David O. Watson 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