Summary
Updated Aug 31, 2026
David R. Horn is PRESIDENT & CFO of Seer, Inc. (SEER). 8 SEC Form 4 filings on record going back to 2024, most recently on 19 August 2026. Most recent open-market trade: sold $15K of SEER on 19 August 2026. Lifetime open-market purchases: $48K. Lifetime open-market sales: $70K.
Recent Transactions
7Every recent SEC Form 4 transaction David R. Horn has reported, most recent first.
Trading Pattern
InsiderAlpha's records for David R. Horn go back to 2024: 8 primary Form 4 filings, an average of 2.7 per year. The typical open-market purchase is $48K (1 buy totaling $48K). The largest single buy on record is $48K of EDAP in 2026. Sales side: 5 recorded sales totaling $70K, so the filing history runs sell-heavy by dollar value. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies David R. Horn 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.
- Lance Willsey - $238K of EDAP open-market activity in the last 12 months
- Omid Farokhzad - $115K of SEER open-market activity in the last 12 months
- Ryan Rhodes - $100K of EDAP open-market activity in the last 12 months
- Joshua Levine - $90K of EDAP open-market activity in the last 12 months
- Fran Schulz - $48K of EDAP open-market activity in the last 12 months
- Sanket Shah - $24K of EDAP 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 R. Horn?
David R. Horn is a corporate insider, tracked as PRESIDENT & CFO of Seer, Inc. (SEER). InsiderAlpha holds 8 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has David R. Horn submitted recently?
2 primary Form 4 filings in the last 90 days, covering 2 companies.
Has David R. Horn been buying or selling stock?
Recorded transactions: 1 open-market purchase ($48K) and 5 open-market sales ($70K) across all tracked filings.
Where can I see all of David R. Horn'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.
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