DesRosier Thomas sold Seres Therapeutics ($MCRB) shares on the open market four times in the past year, for a total of about $3,816. His most recent sale occurred on February 15, 2026. These transactions rank 11,437th among 11,678 individual insiders, well below the average sale amount of $8.6 million across about 6.4 transactions per insider. He made no open market purchases in the last 365 days.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 4, 2026 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | A | Stock Option (right to buy) | 22500 | $0.00 | 22,500.0000 | 9,046,519 | 9999.99% | 0.25% |
| Feb. 15, 2026 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | M | Common Stock | 244 | $0.00 | 7,867.0000 | 9,046,519 | 3.20% | 0.00% |
| Feb. 15, 2026 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | S | Common Stock | 78 | $8.47 | 7,789.0000 | 9,046,519 | 0.99% | 0.00% |
| Feb. 15, 2026 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | M | Restricted Stock Units | 133 | $0.00 | 531.0000 | 9,046,519 | 20.03% | 0.00% |
| Feb. 15, 2026 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | M | Restricted Stock Units | 111 | $0.00 | 890.0000 | 9,046,519 | 11.09% | 0.00% |
| Nov. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | M | Restricted Stock Units | 112 | $0.00 | 1,001.0000 | 9,046,519 | 10.06% | 0.00% |
| Nov. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | M | Restricted Stock Units | 132 | $0.00 | 664.0000 | 9,046,519 | 16.58% | 0.00% |
| Nov. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | S | Common Stock | 76 | $17.30 | 7,623.0000 | 9,046,519 | 0.99% | 0.00% |
| Nov. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | M | Common Stock | 112 | $0.00 | 7,699.0000 | 9,046,519 | 1.48% | 0.00% |
| Nov. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | M | Common Stock | 132 | $0.00 | 7,587.0000 | 9,046,519 | 1.77% | 0.00% |
| Aug. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | M | Restricted Stock Units | 111 | $0.00 | 1,113.0000 | 174,358,753 | 9.07% | 0.00% |
| Aug. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | M | Restricted Stock Units | 133 | $0.00 | 796.0000 | 174,358,753 | 14.32% | 0.00% |
| Aug. 18, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | S | Common Stock | 76 | $16.65 | 7,455.0000 | 174,358,753 | 1.01% | 0.00% |
| Aug. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | M | Common Stock | 133 | $0.00 | 7,420.0000 | 174,358,753 | 1.83% | 0.00% |
| Aug. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | See Remarks | M | Common Stock | 111 | $0.00 | 7,531.0000 | 174,358,753 | 1.50% | 0.00% |
| May 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Common Stock | 111 | $0.00 | 7,366.0000 | 174,358,753 | 1.53% | 0.00% |
| May 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Common Stock | 133 | $0.00 | 7,255.0000 | 174,358,753 | 1.87% | 0.00% |
| May 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | S | Common Stock | 79 | $7.28 | 7,287.0000 | 174,358,753 | 1.07% | 0.00% |
| May 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Restricted Stock Units | 133 | $0.00 | 929.0000 | 174,358,753 | 12.52% | 0.00% |
| May 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Restricted Stock Units | 111 | $0.00 | 1,224.0000 | 174,358,753 | 8.31% | 0.00% |
| Feb. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Common Stock | 2657 | $0.00 | 137,849.0000 | 0 | 1.97% | 0.00% |
| Feb. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Common Stock | 8907 | $0.00 | 146,756.0000 | 0 | 6.46% | 0.00% |
| Feb. 18, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | S | Common Stock | 4300 | $0.81 | 142,456.0000 | 0 | 2.93% | 0.00% |
| Feb. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Restricted Stock Units | 2657 | $0.00 | 21,250.0000 | 0 | 11.11% | 0.00% |
| Feb. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Restricted Stock Units | 8907 | $0.00 | 26,718.0000 | 0 | 25.00% | 0.00% |
| Feb. 7, 2025 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | A | Stock Option (Right to Buy) | 650000 | $0.00 | 650,000.0000 | 0 | 9999.99% | 0.00% |
| Nov. 15, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Restricted Stock Units | 2656 | $0.00 | 23,907.0000 | 0 | 10.00% | 0.00% |
| Nov. 18, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | S | Common Stock | 878 | $0.54 | 135,192.0000 | 0 | 0.65% | 0.00% |
| Nov. 15, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Common Stock | 2656 | $0.00 | 136,070.0000 | 0 | 1.99% | 0.00% |
| Oct. 28, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | S | Common Stock | 4259 | $0.69 | 133,414.0000 | 0 | 3.09% | 0.00% |
| Oct. 27, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Restricted Stock Units | 13500 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Oct. 27, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Common Stock | 13500 | $0.00 | 137,673.0000 | 0 | 10.87% | 0.00% |
| Aug. 15, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Common Stock | 2656 | $0.00 | 125,046.0000 | 0 | 2.17% | 0.00% |
| Aug. 15, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Restricted Stock Units | 2656 | $0.00 | 26,563.0000 | 0 | 9.09% | 0.00% |
| Aug. 16, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | S | Common Stock | 873 | $0.84 | 124,173.0000 | 0 | 0.70% | 0.00% |
| May 15, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Common Stock | 2656 | $0.00 | 123,233.0000 | 0 | 2.20% | 0.00% |
| May 15, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Restricted Stock Units | 2656 | $0.00 | 29,219.0000 | 0 | 8.33% | 0.00% |
| May 15, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | S | Common Stock | 843 | $0.94 | 122,390.0000 | 0 | 0.68% | 0.00% |
| Feb. 16, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | S | Common Stock | 3939 | $1.08 | 120,577.0000 | 0 | 3.16% | 0.00% |
| Feb. 14, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | A | Stock Option (Right to Buy) | 213750 | $0.00 | 213,750.0000 | 0 | 9999.99% | 0.00% |
| Feb. 14, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | A | Stock Option (Right to Buy) | 287905 | $0.00 | 287,905.0000 | 0 | 9999.99% | 0.00% |
| Feb. 14, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | A | Restricted Stock Units | 35625 | $0.00 | 35,625.0000 | 0 | 9999.99% | 0.00% |
| Feb. 15, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Restricted Stock Units | 10625 | $0.00 | 31,875.0000 | 0 | 25.00% | 0.00% |
| Feb. 15, 2024 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Common Stock | 10625 | $0.00 | 124,516.0000 | 0 | 9.33% | 0.00% |
| Oct. 27, 2023 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Restricted Stock Units | 13501 | $0.00 | 13,500.0000 | 0 | 50.00% | 0.00% |
| April 27, 2023 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | A | Restricted Stock Units | 27001 | $0.00 | 27,001.0000 | 0 | 9999.99% | 0.00% |
| Oct. 30, 2023 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | S | Common Stock | 4156 | $1.35 | 113,891.0000 | 0 | 3.52% | 0.00% |
| Oct. 27, 2023 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | M | Common Stock | 13501 | $0.00 | 118,047.0000 | 0 | 12.91% | 0.00% |
| Feb. 3, 2023 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | A | Stock Option (Right to Buy) | 85000 | $0.00 | 85,000.0000 | 0 | 9999.99% | 0.00% |
| Feb. 3, 2023 | Seres Therapeutics, Inc. | $MCRB | DesRosier Thomas | Chief Legal Officer and EVP | A | Restricted Stock Units | 42500 | $0.00 | 42,500.0000 | 0 | 9999.99% | 0.00% |