Seres Therapeutics, Inc. (MCRB)
Seres Therapeutics, Inc. (MCRB) Insider Trading
Directors, officers and holders of more than 10% of MCRB report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 50 most recent of 207 transactions on file: 0 with code P, 8 with code S and 42 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 17, 2026 | DesRosier Thomas | See Remarks | S Sale | 82 | $4.55 | $373 |
| Aug 17, 2026 | Brady Kelly | See Remarks | S Sale | 64 | $4.55 | $291 |
| Aug 17, 2026 | Henn Matthew R | See Remarks | S Sale | 81 | $4.55 | $369 |
| Aug 17, 2026 | Shaff Eric D. | Director | S Sale | 263 | $4.55 | $1,197 |
| Aug 15, 2026 | DesRosier Thomas | See Remarks | M Exercise | 133 | Not measured | Not measured |
| Aug 15, 2026 | Brady Kelly | See Remarks | M Exercise | 91 | Not measured | Not measured |
| Aug 15, 2026 | Henn Matthew R | See Remarks | M Exercise | 238 | Not measured | Not measured |
| Aug 15, 2026 | Brady Kelly | See Remarks | M Exercise | 181 | Not measured | Not measured |
| Aug 15, 2026 | Henn Matthew R | See Remarks | M Exercise | 140 | Not measured | Not measured |
| Aug 15, 2026 | Henn Matthew R | See Remarks | M Exercise | 98 | Not measured | Not measured |
| Aug 15, 2026 | Brady Kelly | See Remarks | M Exercise | 90 | Not measured | Not measured |
| Aug 15, 2026 | Shaff Eric D. | Director | M Exercise | 722 | Not measured | Not measured |
| Aug 15, 2026 | Shaff Eric D. | Director | M Exercise | 332 | Not measured | Not measured |
| Aug 15, 2026 | Shaff Eric D. | Director | M Exercise | 390 | Not measured | Not measured |
| Aug 15, 2026 | DesRosier Thomas | See Remarks | M Exercise | 112 | Not measured | Not measured |
| Aug 15, 2026 | DesRosier Thomas | See Remarks | M Exercise | 245 | Not measured | Not measured |
| Jul 8, 2026 | Fraser Claire | Director | A Award | 6,500 | Not measured | Not measured |
| Jul 8, 2026 | Ausiello Dennis A | Director | A Award | 6,500 | Not measured | Not measured |
| Jul 8, 2026 | Thorell Marella | See Remarks | A Award | 7,500 | Not measured | Not measured |
| Jul 8, 2026 | Graves Kurt | Director | A Award | 6,500 | Not measured | Not measured |
| Jul 8, 2026 | Rosiello Robert L. | Director | A Award | 6,500 | Not measured | Not measured |
| Jul 8, 2026 | Brady Kelly | See Remarks | A Award | 18,750 | Not measured | Not measured |
| Jul 8, 2026 | Berenson Stephen | Director | A Award | 6,500 | Not measured | Not measured |
| Jul 8, 2026 | Shaff Eric D. | Director | A Award | 6,500 | Not measured | Not measured |
| Jul 8, 2026 | DesRosier Thomas | See Remarks | A Award | 7,500 | Not measured | Not measured |
| Jul 8, 2026 | Henn Matthew R | See Remarks | A Award | 25,000 | Not measured | Not measured |
| Jul 8, 2026 | Kender Richard N | See Remarks | A Award | 50,000 | Not measured | Not measured |
| Jul 8, 2026 | Dere Willard H | Director | A Award | 6,500 | Not measured | Not measured |
| Jul 1, 2026 | Ausiello Dennis A | Director | A Award | 7,508 | Not measured | Not measured |
| Jul 1, 2026 | Rosiello Robert L. | Director | A Award | 7,508 | Not measured | Not measured |
| Jul 1, 2026 | Berenson Stephen | Director | A Award | 7,508 | Not measured | Not measured |
| May 18, 2026 | Brady Kelly | See Remarks | S Sale | 59 | $7.53 | $444 |
| May 18, 2026 | Henn Matthew R | See Remarks | S Sale | 77 | $7.53 | $580 |
| May 18, 2026 | Shaff Eric D. | Director | S Sale | 259 | $7.53 | $1,950 |
| May 18, 2026 | DesRosier Thomas | See Remarks | S Sale | 79 | $7.53 | $595 |
| May 15, 2026 | Brady Kelly | See Remarks | M Exercise | 180 | Not measured | Not measured |
| May 15, 2026 | Henn Matthew R | See Remarks | M Exercise | 238 | Not measured | Not measured |
| May 15, 2026 | Brady Kelly | See Remarks | M Exercise | 91 | Not measured | Not measured |
| May 15, 2026 | Shaff Eric D. | Director | M Exercise | 722 | Not measured | Not measured |
| May 15, 2026 | Henn Matthew R | See Remarks | M Exercise | 141 | Not measured | Not measured |
| May 15, 2026 | Henn Matthew R | See Remarks | M Exercise | 97 | Not measured | Not measured |
| May 15, 2026 | Shaff Eric D. | Director | M Exercise | 331 | Not measured | Not measured |
| May 15, 2026 | DesRosier Thomas | See Remarks | M Exercise | 244 | Not measured | Not measured |
| May 15, 2026 | Brady Kelly | See Remarks | M Exercise | 89 | Not measured | Not measured |
| May 15, 2026 | DesRosier Thomas | See Remarks | M Exercise | 133 | Not measured | Not measured |
| May 15, 2026 | DesRosier Thomas | See Remarks | M Exercise | 111 | Not measured | Not measured |
| May 15, 2026 | Shaff Eric D. | Director | M Exercise | 391 | Not measured | Not measured |
| Mar 4, 2026 | Kender Richard N | See Remarks | A Award | 150,000 | Not measured | Not measured |
| Mar 4, 2026 | Henn Matthew R | See Remarks | A Award | 75,000 | Not measured | Not measured |
| Mar 4, 2026 | DesRosier Thomas | See Remarks | A Award | 22,500 | Not measured | Not measured |
The full Form 4 history is on the MCRB company page (Insider Trades card, View all).
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.