Eric D. Shaff is Director at Seres Therapeutics, Inc. (MCRB). They have made 2 open-market trades across 1 company since 2016, most recently 2026-08-17.
CIK 0001643734
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.
0 open-market purchases, against 2 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MCRB | 12,499 | $26K |
Shares reported on the most recent Form 4, priced at the 2026-08-18 close.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MCRB | SELL · 10b5-1 | 2026-08-17 | 2026-08-18 | $4.55 | $1K | +13.1% | -8.2% | — |
| MCRB | SELL · 10b5-1 | 2026-05-18 | 2026-05-19 | $7.53 | $2K | -4.3% | -13.0% | -40.6% |
| MCRB | SELL · 10b5-1 | 2026-02-15 | 2026-02-18 | $8.47 | $2K | +8.9% | +2.7% | -9.1% |
| MCRB | SELL · 10b5-1 | 2025-11-15 | 2025-11-18 | $17.30 | $4K | -27.1% | -35.8% | -65.2% |
| MCRB | SELL · 10b5-1 | 2025-08-18 | 2025-08-19 | $16.65 | $4K | +16.3% | +10.7% | +32.9% |
| MCRB | SELL · 10b5-1 | 2025-05-16 | 2025-05-19 | $7.28 | $2K | -11.2% | -2.6% | +122.8% |
| MCRB | SELL · 10b5-1 | 2025-02-18 | 2025-02-19 | $0.81 | $10K | -8.7% | -13.2% | -49.8% |
| MCRB | SELL · 10b5-1 | 2024-11-18 | 2024-11-19 | $0.54 | $1K | +35.8% | +34.9% | +21.8% |
| MCRB | SELL · 10b5-1 | 2024-10-28 | 2024-10-29 | $0.69 | $6K | -5.4% | +29.7% | +11.4% |
| MCRB | SELL · 10b5-1 | 2024-08-16 | 2024-08-19 | $0.84 | $2K | -13.4% | +15.1% | -36.5% |
| MCRB | SELL · 10b5-1 | 2024-05-15 | 2024-05-17 | $0.94 | $2K | +6.4% | -26.7% | -3.3% |
| MCRB | SELL · 10b5-1 | 2024-02-16 | 2024-02-16 | $1.08 | $12K | +5.6% | -29.8% | -14.4% |
| MCRB | SELL · 10b5-1 | 2023-10-30 | 2023-10-31 | $1.35 | $12K | -32.8% | -31.1% | -17.2% |
| MCRB | SELL | 2019-01-28 | 2019-01-29 | $5.75 | $25K | -0.7% | +1.7% | +15.3% |
| MCRB | SELL | 2018-01-26 | 2018-01-30 | $11.02 | $31K | -20.1% | -9.7% | -27.4% |
| MCRB | SELL · 10b5-1 | 2016-06-30 | 2016-06-30 | $29.54 | $134K | +9.9% | -66.2% | -54.2% |
| MCRB | SELL · 10b5-1 | 2016-06-27 | 2016-06-29 | $28.28 | $141K | +9.4% | -63.0% | -55.0% |
| MCRB | SELL · 10b5-1 | 2016-04-04 | 2016-04-06 | $28.85 | $189K | +1.6% | -18.9% | -2.0% |
| MCRB | SELL · 10b5-1 | 2016-03-31 | 2016-04-04 | $26.30 | $202K | +6.6% | -5.4% | +3.7% |
| MCRB | SELL · 10b5-1 | 2016-03-28 | 2016-03-29 | $24.07 | $132K | +21.5% | +15.7% | +6.1% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.