Form 4 for MCRB Seres Therapeutics, Inc.
Accepted 2026-05-19 16:05:04 ET · period of report 2026-05-15 · accession 0001193125-26-230728 · 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 | 2026-05-19 16:05 | 2026-05-15 | MCRB | DesRosier Thomas | See Remarks | M - OptEx | — | +244 | 8,033 | +3% | — |
| DT | 2026-05-19 16:05 | 2026-05-18 | MCRB | DesRosier Thomas | See Remarks | S - Sale+OE | $7.53 | -79 | 7,954 | -1.0% | -$594.87 |
| DMT | 2026-05-19 16:05 | 2026-05-15 | MCRB | DesRosier Thomas | See Remarks | M - OptEx | $0.00 | -244 | 779 | -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 | 2026-05-15 | M | A | 244 | — | 8,033 | D | — | — | (F1) Each restricted stock unit represents a contingent right to receive one share of Issuer common stock. |
| 2 | Common | Common Stock | 2026-05-18 | S | D | 79 | $7.53 | 7,954 | D | — | — | (F2) The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 instruction adopted by the reporting person on March 2, 2023, solely with the intent to cover taxes in connection with the vesting of the restricted stock units. |
| 3 | Derivative | Restricted Stock Units | 2026-05-15 | M | D | 133 | $0.00 | 398 | D | — · — to — | 133 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. (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. |
| 4 | Derivative | Restricted Stock Units | 2026-05-15 | M | D | 111 | $0.00 | 779 | D | — · — to — | 111 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. (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. |