Matthew R. Henn sold Seres Therapeutics ($MCRB) shares on the open market four times in the last year, totaling about $24,300. His most recent sale occurred on February 15, 2026. He ranks in 10,944th place among nearly 12,000 insiders for sales volume, well below the average of $8.6 million across 6.4 transactions. Henn made no open market purchases during this period.
| 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 | Henn Matthew R | See Remarks | A | Stock Option (right to buy) | 75000 | $0.00 | 75,000.0000 | 9,046,519 | 9999.99% | 0.83% |
| Feb. 15, 2026 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | S | Common Stock | 89 | $8.47 | 7,677.0000 | 9,046,519 | 1.15% | 0.00% |
| Feb. 15, 2026 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Restricted Stock Units | 141 | $0.00 | 563.0000 | 9,046,519 | 20.03% | 0.00% |
| Feb. 15, 2026 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Restricted Stock Units | 98 | $0.00 | 780.0000 | 9,046,519 | 11.16% | 0.00% |
| Feb. 15, 2026 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Common Stock | 239 | $0.00 | 7,766.0000 | 9,046,519 | 3.18% | 0.00% |
| Nov. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | S | Common Stock | 1257 | $17.30 | 7,527.0000 | 9,046,519 | 14.31% | 0.01% |
| Nov. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Common Stock | 98 | $0.00 | 8,784.0000 | 9,046,519 | 1.13% | 0.00% |
| Nov. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Common Stock | 140 | $0.00 | 8,686.0000 | 9,046,519 | 1.64% | 0.00% |
| Nov. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Common Stock | 3998 | $0.00 | 8,546.0000 | 9,046,519 | 87.91% | 0.04% |
| Nov. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Restricted Stock Units | 98 | $0.00 | 878.0000 | 9,046,519 | 10.04% | 0.00% |
| Nov. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Restricted Stock Units | 140 | $0.00 | 704.0000 | 9,046,519 | 16.59% | 0.00% |
| Nov. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Restricted Stock Units | 3998 | $0.00 | 0.0000 | 9,046,519 | 100.00% | 0.04% |
| Sept. 26, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | A | Restricted Stock Units | 3998 | $0.00 | 3,998.0000 | 174,358,753 | 9999.99% | 0.00% |
| Aug. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Common Stock | 141 | $0.00 | 4,524.0000 | 174,358,753 | 3.22% | 0.00% |
| Aug. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Common Stock | 97 | $0.00 | 4,621.0000 | 174,358,753 | 2.14% | 0.00% |
| Aug. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Restricted Stock Units | 97 | $0.00 | 976.0000 | 174,358,753 | 9.04% | 0.00% |
| Aug. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Restricted Stock Units | 141 | $0.00 | 844.0000 | 174,358,753 | 14.31% | 0.00% |
| Aug. 18, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | S | Common Stock | 73 | $16.65 | 4,548.0000 | 174,358,753 | 1.58% | 0.00% |
| May 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Common Stock | 98 | $0.00 | 4,460.0000 | 174,358,753 | 2.25% | 0.00% |
| May 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Common Stock | 140 | $0.00 | 4,362.0000 | 174,358,753 | 3.32% | 0.00% |
| May 16, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | S | Common Stock | 77 | $7.28 | 4,383.0000 | 174,358,753 | 1.73% | 0.00% |
| May 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Restricted Stock Units | 140 | $0.00 | 985.0000 | 174,358,753 | 12.44% | 0.00% |
| May 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R | See Remarks | M | Restricted Stock Units | 98 | $0.00 | 1,073.0000 | 174,358,753 | 8.37% | 0.00% |
| Feb. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Common Stock | 2813 | $0.00 | 80,583.0000 | 0 | 3.62% | 0.00% |
| Feb. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Common Stock | 7813 | $0.00 | 88,396.0000 | 0 | 9.70% | 0.00% |
| Feb. 18, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | S | Common Stock | 3953 | $0.81 | 84,443.0000 | 0 | 4.47% | 0.00% |
| Feb. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Restricted Stock Units | 2813 | $0.00 | 22,500.0000 | 0 | 11.11% | 0.00% |
| Feb. 15, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Restricted Stock Units | 7813 | $0.00 | 23,437.0000 | 0 | 25.00% | 0.00% |
| Feb. 7, 2025 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | A | Stock Option (Right to Buy) | 650000 | $0.00 | 650,000.0000 | 0 | 9999.99% | 0.00% |
| Nov. 15, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Restricted Stock Units | 2812 | $0.00 | 25,313.0000 | 0 | 10.00% | 0.00% |
| Nov. 18, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | S | Common Stock | 927 | $0.54 | 77,770.0000 | 0 | 1.18% | 0.00% |
| Nov. 15, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Common Stock | 2812 | $0.00 | 78,697.0000 | 0 | 3.71% | 0.00% |
| Oct. 27, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Restricted Stock Units | 12622 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Oct. 27, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Common Stock | 12622 | $0.00 | 79,869.0000 | 0 | 18.77% | 0.00% |
| Oct. 28, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | S | Common Stock | 3984 | $0.69 | 75,885.0000 | 0 | 4.99% | 0.00% |
| Aug. 15, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Restricted Stock Units | 2813 | $0.00 | 28,125.0000 | 0 | 9.09% | 0.00% |
| Aug. 16, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | S | Common Stock | 923 | $0.84 | 67,247.0000 | 0 | 1.35% | 0.00% |
| Aug. 15, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Common Stock | 2813 | $0.00 | 68,170.0000 | 0 | 4.30% | 0.00% |
| May 15, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Common Stock | 2812 | $0.00 | 66,248.0000 | 0 | 4.43% | 0.00% |
| May 15, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Restricted Stock Units | 2812 | $0.00 | 30,938.0000 | 0 | 8.33% | 0.00% |
| May 15, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | S | Common Stock | 891 | $0.94 | 65,357.0000 | 0 | 1.34% | 0.00% |
| Feb. 14, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | A | Restricted Stock Units | 31250 | $0.00 | 31,250.0000 | 0 | 9999.99% | 0.00% |
| Feb. 15, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Restricted Stock Units | 11250 | $0.00 | 33,750.0000 | 0 | 25.00% | 0.00% |
| Feb. 16, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | S | Common Stock | 4170 | $1.08 | 63,436.0000 | 0 | 6.17% | 0.00% |
| Feb. 15, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Common Stock | 11250 | $0.00 | 67,606.0000 | 0 | 19.96% | 0.00% |
| Feb. 14, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | A | Stock Option (Right to Buy) | 187500 | $0.00 | 187,500.0000 | 0 | 9999.99% | 0.00% |
| Feb. 14, 2024 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | A | Stock Option (Right to Buy) | 287905 | $0.00 | 287,905.0000 | 0 | 9999.99% | 0.00% |
| Oct. 30, 2023 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | S | Common Stock | 3886 | $1.35 | 56,356.0000 | 0 | 6.45% | 0.00% |
| Oct. 27, 2023 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Common Stock | 12623 | $0.00 | 60,242.0000 | 0 | 26.51% | 0.00% |
| April 27, 2023 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | A | Restricted Stock Units | 25245 | $0.00 | 25,245.0000 | 0 | 9999.99% | 0.00% |
| Oct. 27, 2023 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | M | Restricted Stock Units | 12623 | $0.00 | 12,622.0000 | 0 | 50.00% | 0.00% |
| April 27, 2023 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | A | Stock Option (Right to Buy) | 35000 | $0.00 | 70,000.0000 | 0 | 100.00% | 0.00% |
| Feb. 3, 2023 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | A | Stock Option (Right to Buy) | 90000 | $0.00 | 90,000.0000 | 0 | 9999.99% | 0.00% |
| Feb. 3, 2023 | Seres Therapeutics, Inc. | $MCRB | Henn Matthew R. | See Remarks | A | Restricted Stock Units | 45000 | $0.00 | 45,000.0000 | 0 | 9999.99% | 0.00% |