Form 4 for MCRB Seres Therapeutics, Inc.
Accepted 2025-08-19 00:00:00 ET · period of report 2025-08-15 · accession 0000950170-25-110096 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DT | 2025-08-19 | 2025-08-18 | MCRB | Shaff Eric D. | Dir | S - Sale+OE | $16.65 | -217 | 10.6K | -2% | -$3,613 |
| DMT | 2025-08-19 | 2025-08-15 | MCRB | Shaff Eric D. | Dir | M - OptEx | — | +724 | 10.5K | +7% | — |
| DMT | 2025-08-19 | 2025-08-15 | MCRB | Shaff Eric D. | Dir | M - OptEx | $0.00 | -724 | 2,344 | -24% | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2025-08-18 | S | D | 217 | $16.65 | 10,609 | D | — | — | |
| 2 | Common | Common Stock | 2025-08-15 | M | A | 333 | — | 10,826 | D | — | — | (F1) Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. |
| 3 | Common | Common Stock | 2025-08-15 | M | A | 391 | — | 10,493 | D | — | — | (F1) Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. |
| 4 | Derivative | Restricted Stock Units | 2025-08-15 | M | D | 333 | $0.00 | 3,320 | D | — · — to — | 333 Common Stock | (F1) Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. (F4) The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2025. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date. |
| 5 | Derivative | Restricted Stock Units | 2025-08-15 | M | D | 391 | $0.00 | 2,344 | D | — · — to — | 391 Common Stock | (F1) Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. (F3) The restricted stock units vested and settled as to 25% of the restricted stock units on February 15, 2024. The remainder of the restricted stock units have vested and settled or will vest and settle in 12 equal quarterly installments thereafter. The restricted stock units have no expiration date. |