David R. Horn is CFO at Seer, Inc. (SEER). They have made 23 open-market trades across 2 companies since 2021, most recently 2026-08-18.
CIK 0001834217
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
1 open-market purchase totalling $48K since 2026, against 22 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| SEER | 486,650 | $988K |
| EDAP | 10,000 | $42K |
| Total | $1.0M |
Shares reported on the most recent Form 4, priced at the 2026-08-19 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| SEER | SELL | 2026-08-18 | 2026-08-19 | $2.03 | $15K | -5.1% | -8.7% | — |
| EDAP | BUY | 2026-08-14 | 2026-08-17 | $4.75 | $48K | N/A | N/A | — |
| SEER | SELL | 2026-05-20 | 2026-05-21 | $1.69 | $12K | +4.2% | -2.2% | +15.1% |
| SEER | SELL | 2026-02-18 | 2026-02-19 | $1.99 | $15K | -14.7% | -19.0% | -20.4% |
| SEER | SELL | 2025-11-19 | 2025-11-21 | $1.97 | $13K | -3.0% | -8.1% | +4.5% |
| SEER | SELL | 2025-08-20 | 2025-08-21 | $2.04 | $14K | -1.9% | +7.3% | -2.9% |
| SEER | SELL | 2025-05-20 | 2025-05-22 | $2.08 | $14K | +6.3% | -4.4% | -0.5% |
| SEER | SELL | 2025-02-04 | 2025-02-05 | $2.24 | $8K | +0.4% | -14.4% | -17.5% |
| SEER | SELL | 2024-02-22 | 2024-02-23 | $1.58 | $20K | +30.5% | +24.0% | +28.6% |
| SEER | SELL | 2024-02-05 | 2024-02-07 | $1.67 | $6K | -10.3% | +19.4% | +26.3% |
| SEER | SELL | 2023-02-21 | 2023-02-22 | $4.13 | $25K | +25.1% | -5.8% | -3.3% |
| SEER | SELL | 2023-02-07 | 2023-02-08 | $5.40 | $17K | -17.1% | -8.8% | -23.4% |
| SEER | SELL | 2023-01-17 | 2023-01-19 | $5.12 | $13K | -13.3% | -25.0% | -25.9% |
| SEER | SELL | 2022-12-08 | 2022-12-08 | $6.57 | $248K | -14.9% | -21.1% | -27.1% |
| SEER | SELL | 2022-02-02 | 2022-02-04 | $17.40 | $102K | -3.1% | -25.8% | -44.3% |
| SEER | SELL | 2022-01-03 | 2022-01-04 | $22.81 | $105K | -6.3% | -27.1% | -23.1% |
| SEER | SELL | 2021-12-06 | 2021-12-08 | $20.26 | $1.1M | -10.9% | -27.2% | -53.0% |
| SEER | SELL | 2021-11-01 | 2021-11-03 | $37.78 | $756K | -17.8% | -42.8% | -53.0% |
| SEER | SELL | 2021-10-01 | 2021-10-05 | $33.85 | $677K | +3.1% | +9.3% | -26.9% |
| SEER | SELL | 2021-09-01 | 2021-09-02 | $39.56 | $763K | -5.2% | -23.5% | -50.7% |
| SEER | SELL | 2021-08-02 | 2021-08-04 | $31.20 | $624K | -2.9% | +39.7% | +15.5% |
| SEER | SELL | 2021-07-01 | 2021-07-06 | $31.28 | $547K | +6.8% | +13.6% | +12.7% |
| SEER | SELL | 2021-06-02 | 2021-06-04 | $30.10 | $301K | -4.3% | -13.0% | +29.0% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.