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United States Biotechnology & Medical Research

Seres Therapeutics Inc (MCRB)

Track

Over the last 90 days, Seres Therapeutics Inc. has seen significant insider selling, with a net value of approximately -$444,270. All reported transactions were sales, totaling $4,853,450. This activity occurred against a backdrop of a 23.8% stock price decrease over the same period. The company's last earnings report missed expectations by 10.64%.
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Ticker: MCRB Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
TERESA L YOUNG
Officer
1 sale — total 1,284 USD
Proposed sale 19 May 2026
Value US$4,452,745.11 | Price 141.71 | Shares 79,897
Sale 18 May 2026
Value US$4,312,136.11 | Price 264.72 | Shares 82,356
Planned sale 18 May 2026
Value US$594.87 | Price 7.53 | Shares 79
Planned sale 18 May 2026
Value US$1,950.27 | Price 7.53 | Shares 259
Planned sale 18 May 2026
Value US$579.81 | Price 7.53 | Shares 77
Proposed sale 17 Mar 2026
Value US$77,966.58 | Price 9.12 | Shares 8,553
Planned sale 15 Feb 2026
Value US$660.66 | Price 8.47 | Shares 78
Planned sale 15 Feb 2026
Value US$635.25 | Price 8.47 | Shares 75
Planned sale 15 Feb 2026
Value US$753.83 | Price 8.47 | Shares 89
Planned sale 15 Feb 2026
Value US$2,193.73 | Price 8.47 | Shares 259
Planned sale 15 Nov 2025
Value US$1,314.80 | Price 17.30 | Shares 76
Planned sale 15 Nov 2025
Value US$21,746.10 | Price 17.30 | Shares 1,257
Planned sale 15 Nov 2025
Value US$3,754.10 | Price 17.30 | Shares 217
Planned sale 15 Nov 2025
Value US$18,026.60 | Price 17.30 | Shares 1,042
Planned sale 18 Aug 2025
Value US$3,613.05 | Price 16.65 | Shares 217
Planned sale 18 Aug 2025
Value US$1,265.40 | Price 16.65 | Shares 76
Planned sale 18 Aug 2025
Value US$1,215.45 | Price 16.65 | Shares 73
Planned sale 18 Aug 2025
Value US$982.35 | Price 16.65 | Shares 59
Planned sale 16 May 2025
Value US$1,601.60 | Price 7.28 | Shares 220
Planned sale 16 May 2025
Value US$458.64 | Price 7.28 | Shares 63
Planned sale 16 May 2025
Value US$560.56 | Price 7.28 | Shares 77
Planned sale 15 May 2025
Value US$575.12 | Price 7.28 | Shares 79
Planned sale 18 Feb 2025
Value US$2,704.45 | Price 0.81 | Shares 3,338
Planned sale 18 Feb 2025
Value US$3,203.51 | Price 0.81 | Shares 3,953
Planned sale 18 Feb 2025
Value US$3,579.17 | Price 0.81 | Shares 4,416
Planned sale 18 Feb 2025
Value US$10,314.42 | Price 0.81 | Shares 12,726
Planned sale 18 Feb 2025
Value US$3,485.15 | Price 0.81 | Shares 4,300
Planned sale 18 Nov 2024
Value US$474.73 | Price 0.54 | Shares 878
Planned sale 18 Nov 2024
Value US$528.26 | Price 0.54 | Shares 977
Planned sale 18 Nov 2024
Value US$501.23 | Price 0.54 | Shares 927
Planned sale 18 Nov 2024
Value US$397.64 | Price 0.54 | Shares 735
Planned sale 18 Nov 2024
Value US$1,354.95 | Price 0.54 | Shares 2,505
Planned sale 28 Oct 2024
Value US$2,991.33 | Price 0.69 | Shares 4,334
Planned sale 28 Oct 2024
Value US$2,058.57 | Price 0.69 | Shares 2,983
Planned sale 28 Oct 2024
Value US$2,939.14 | Price 0.69 | Shares 4,259
Planned sale 28 Oct 2024
Value US$2,749.36 | Price 0.69 | Shares 3,984
Planned sale 28 Oct 2024
Value US$6,036.99 | Price 0.69 | Shares 8,748
Planned sale 16 Aug 2024
Value US$733.32 | Price 0.84 | Shares 873
Planned sale 16 Aug 2024
Value US$817.32 | Price 0.84 | Shares 973
Planned sale 16 Aug 2024
Value US$947.52 | Price 0.84 | Shares 1,128
Planned sale 16 Aug 2024
Value US$2,115.12 | Price 0.84 | Shares 2,518
Planned sale 16 Aug 2024
Value US$775.32 | Price 0.84 | Shares 923
Planned sale 16 Aug 2024
Value US$611.52 | Price 0.84 | Shares 728
Planned sale 5 Aug 2024
Value US$26,533.87 | Price 1.08 | Shares 24,480
Planned sale 15 May 2024
Value US$2,288.90 | Price 0.94 | Shares 2,435
Planned sale 15 May 2024
Value US$792.42 | Price 0.94 | Shares 843
Planned sale 15 May 2024
Value US$660.82 | Price 0.94 | Shares 703
Planned sale 15 May 2024
Value US$1,024.60 | Price 0.94 | Shares 1,090
Planned sale 15 May 2024
Value US$837.54 | Price 0.94 | Shares 891
Planned sale 15 May 2024
Value US$882.66 | Price 0.94 | Shares 939
Planned sale 16 Feb 2024
Value US$4,503.60 | Price 1.08 | Shares 4,170
Planned sale 16 Feb 2024
Value US$4,254.12 | Price 1.08 | Shares 3,939
Planned sale 16 Feb 2024
Value US$5,410.80 | Price 1.08 | Shares 5,010
Planned sale 16 Feb 2024
Value US$12,472.92 | Price 1.08 | Shares 11,549
Planned sale 16 Feb 2024
Value US$4,254.12 | Price 1.08 | Shares 3,939
Planned sale 16 Feb 2024
Value US$3,643.92 | Price 1.08 | Shares 3,374
Planned sale 16 Feb 2024
Value US$4,752.00 | Price 1.08 | Shares 4,400
Planned sale 30 Oct 2023
Value US$5,489.10 | Price 1.35 | Shares 4,066
Planned sale 30 Oct 2023
Value US$5,246.10 | Price 1.35 | Shares 3,886
Planned sale 30 Oct 2023
Value US$3,920.40 | Price 1.35 | Shares 2,904
Planned sale 30 Oct 2023
Value US$5,713.20 | Price 1.35 | Shares 4,232
Planned sale 30 Oct 2023
Value US$11,545.20 | Price 1.35 | Shares 8,552
Planned sale 30 Oct 2023
Value US$5,489.10 | Price 1.35 | Shares 4,066
Planned sale 30 Oct 2023
Value US$3,924.45 | Price 1.35 | Shares 2,907
Planned sale 30 Oct 2023
Value US$5,610.60 | Price 1.35 | Shares 4,156
Planned sale 28 Apr 2023
Value US$36,527.22 | Price 5.19 | Shares 7,038
Planned sale 31 Oct 2022
Value US$39,745.16 | Price 7.93 | Shares 5,012
Buy 5 Jul 2022
Value US$18,350,309.25 | Price 3.15 | Shares 5,825,495
Buy 5 Jul 2022
Value US$9,175,156.20 | Price 3.15 | Shares 2,912,748
Planned sale 1 Dec 2020
Value US$278,893.94 | Price 28.34 | Shares 9,841
Planned sale 1 Dec 2020
Value US$723,863.40 | Price 27.56 | Shares 26,265
Planned sale 1 Dec 2020
Value US$1,479,551.36 | Price 26.56 | Shares 55,706
Planned sale 22 Nov 2019
Value US$13,296.72 | Price 3.91 | Shares 3,400
Buy 18 Jun 2019
Value US$9,999,999.00 | Price 2.25 | Shares 4,444,444
Buy 18 Jun 2019
Value US$9,999,999.00 | Price 2.25 | Shares 4,444,444
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-05-19 2026-05-19 PrS Proposed sale
TERESA L YOUNG

Officer

Officer
79,897
141.71
US$4,452,745 		79,897 141.71 US$4,452,745
2026-05-19 2026-05-18 S Sale
Brady Kelly

See Remarks

Officer
82,356 +28.6%
264.72
US$4,312,136 		82,356 +28.6% 264.72 US$4,312,136
2026-05-19 2026-05-18 PlS Planned sale
1.6
DesRosier Thomas

See Remarks

Officer
21,612 -18.4%
466.34
US$3,970,585 		21,612 -18.4% 466.34 US$3,970,585
2026-05-19 2026-05-18 PlS Planned sale
1.6
Shaff Eric D.
Non-Executive Director
259 -2.1%
7.53
US$1,950 		259 -2.1% 7.53 US$1,950
2026-05-19 2026-05-18 PlS Planned sale
Henn Matthew R

See Remarks

Officer
77 -1.0%
7.53
US$580 		77 -1.0% 7.53 US$580
2026-03-17 2026-03-17 PrS Proposed sale
TERESA L YOUNG

Officer

Officer
8,553
9.12
US$77,967 		8,553 9.12 US$77,967
2026-02-18 2026-02-15 PlS Planned sale
1.6
DesRosier Thomas

See Remarks

Officer
78 -1.0%
8.47
US$661 		78 -1.0% 8.47 US$661
2026-02-18 2026-02-15 PlS Planned sale
Young Teresa L.

See Remarks

Officer
75 -0.9%
8.47
US$635 		75 -0.9% 8.47 US$635
2026-02-18 2026-02-15 PlS Planned sale
Henn Matthew R

See Remarks

Officer
89 -1.1%
8.47
US$754 		89 -1.1% 8.47 US$754
2026-02-18 2026-02-15 PlS Planned sale
1.6
Shaff Eric D.
Non-Executive Director
259 -2.2%
8.47
US$2,194 		259 -2.2% 8.47 US$2,194
2025-11-18 2025-11-15 PlS Planned sale
1.6
DesRosier Thomas

See Remarks

Officer
76 -1.0%
17.30
US$1,315 		76 -1.0% 17.30 US$1,315
2025-11-18 2025-11-15 PlS Planned sale
Henn Matthew R

See Remarks

Officer
1,257 -14.3%
17.30
US$21,746 		1,257 -14.3% 17.30 US$21,746
2025-11-18 2025-11-15 PlS Planned sale
1.6
Shaff Eric D.
Non-Executive Director
217 -1.9%
17.30
US$3,754 		217 -1.9% 17.30 US$3,754
2025-11-18 2025-11-15 PlS Planned sale
Young Teresa L.

See Remarks

Officer
1,042 -11.0%
17.30
US$18,027 		1,042 -11.0% 17.30 US$18,027
2025-08-19 2025-08-18 PlS Planned sale
1.6
Shaff Eric D.
Non-Executive Director
217 -2.0%
16.65
US$3,613 		217 -2.0% 16.65 US$3,613
2025-08-19 2025-08-18 PlS Planned sale
1.6
DesRosier Thomas

See Remarks

Officer
76 -1.0%
16.65
US$1,265 		76 -1.0% 16.65 US$1,265
2025-08-19 2025-08-18 PlS Planned sale
Henn Matthew R

See Remarks

Officer
73 -1.6%
16.65
US$1,215 		73 -1.6% 16.65 US$1,215
2025-08-19 2025-08-18 PlS Planned sale
Young Teresa L.

See Remarks

Officer
59 -1.1%
16.65
US$982 		59 -1.1% 16.65 US$982
2025-05-19 2025-05-16 PlS Planned sale
1.6
Shaff Eric D.

CEO and President

Executive Director
220 -2.1%
7.28
US$1,602 		220 -2.1% 7.28 US$1,602
2025-05-19 2025-05-16 PlS Planned sale
Young Teresa L.

See Remarks

Officer
63 -1.2%
7.28
US$459 		63 -1.2% 7.28 US$459
2025-05-19 2025-05-16 PlS Planned sale
Henn Matthew R

See Remarks

Officer
77 -1.7%
7.28
US$561 		77 -1.7% 7.28 US$561
2025-05-19 2025-05-15 PlS Planned sale
1.6
DesRosier Thomas

Chief Legal Officer and EVP

Officer
79 -1.1%
7.28
US$575 		79 -1.1% 7.28 US$575
2025-02-19 2025-02-18 PlS Planned sale
Young Teresa L.

See Remarks

Officer
3,338 -3.3%
0.81
US$2,704 		3,338 -3.3% 0.81 US$2,704
2025-02-19 2025-02-18 PlS Planned sale
Henn Matthew R.

See Remarks

Officer
3,953 -4.5%
0.81
US$3,204 		3,953 -4.5% 0.81 US$3,204
2025-02-19 2025-02-18 PlS Planned sale
von Moltke Lisa

See Remarks

Officer
4,416 -10.0%
0.81
US$3,579 		4,416 -10.0% 0.81 US$3,579
2025-02-19 2025-02-18 PlS Planned sale
1.6
Shaff Eric D.

CEO and President

Executive Director
12,726 -6.2%
0.81
US$10,314 		12,726 -6.2% 0.81 US$10,314
2025-02-19 2025-02-18 PlS Planned sale
1.6
DesRosier Thomas

Chief Legal Officer and EVP

Officer
4,300 -2.9%
0.81
US$3,485 		4,300 -2.9% 0.81 US$3,485
2024-11-19 2024-11-18 PlS Planned sale
1.6
DesRosier Thomas

Chief Legal Officer and EVP

Officer
878 -0.6%
0.54
US$475 		878 -0.6% 0.54 US$475
2024-11-19 2024-11-18 PlS Planned sale
von Moltke Lisa

See Remarks

Officer
977 -2.9%
0.54
US$528 		977 -2.9% 0.54 US$528
2024-11-19 2024-11-18 PlS Planned sale
Henn Matthew R.

See Remarks

Officer
927 -1.2%
0.54
US$501 		927 -1.2% 0.54 US$501
2024-11-19 2024-11-18 PlS Planned sale
Young Teresa L.

See Remarks

Officer
735 -0.8%
0.54
US$398 		735 -0.8% 0.54 US$398
2024-11-19 2024-11-18 PlS Planned sale
1.6
Shaff Eric D.

CEO and President

Executive Director
2,505 -1.4%
0.54
US$1,355 		2,505 -1.4% 0.54 US$1,355
2024-10-29 2024-10-28 PlS Planned sale
von Moltke Lisa

See Remarks

Officer
4,334 -12.5%
0.69
US$2,991 		4,334 -12.5% 0.69 US$2,991
2024-10-29 2024-10-28 PlS Planned sale
Young Teresa L.

See Remarks

Officer
2,983 -3.3%
0.69
US$2,059 		2,983 -3.3% 0.69 US$2,059
2024-10-29 2024-10-28 PlS Planned sale
1.6
DesRosier Thomas

Chief Legal Officer and EVP

Officer
4,259 -3.1%
0.69
US$2,939 		4,259 -3.1% 0.69 US$2,939
2024-10-29 2024-10-28 PlS Planned sale
Henn Matthew R.

See Remarks

Officer
3,984 -5.0%
0.69
US$2,749 		3,984 -5.0% 0.69 US$2,749
2024-10-29 2024-10-28 PlS Planned sale
1.6
Shaff Eric D.

CEO and President

Executive Director
8,748 -5.0%
0.69
US$6,037 		8,748 -5.0% 0.69 US$6,037
2024-08-19 2024-08-16 PlS Planned sale
1.6
DesRosier Thomas

Chief Legal Officer and EVP

Officer
873 -0.7%
0.84
US$733 		873 -0.7% 0.84 US$733
2024-08-19 2024-08-16 PlS Planned sale
von Moltke Lisa

See Remarks

Officer
973 -4.4%
0.84
US$817 		973 -4.4% 0.84 US$817
2024-08-19 2024-08-16 PlS Planned sale
Ege David S.

See Remarks

Officer
1,128 -1.4%
0.84
US$948 		1,128 -1.4% 0.84 US$948
2024-08-19 2024-08-16 PlS Planned sale
1.6
Shaff Eric D.

CEO and President

Executive Director
2,518 -1.7%
0.84
US$2,115 		2,518 -1.7% 0.84 US$2,115
2024-08-19 2024-08-16 PlS Planned sale
Henn Matthew R.

See Remarks

Officer
923 -1.4%
0.84
US$775 		923 -1.4% 0.84 US$775
2024-08-19 2024-08-16 PlS Planned sale
Young Teresa L.

See Remarks

Officer
728 -0.9%
0.84
US$612 		728 -0.9% 0.84 US$612
2024-08-06 2024-08-05 PlS Planned sale
Young Teresa L.

See Remarks

Officer
24,480 -23.8%
1.08
US$26,534 		24,480 -23.8% 1.08 US$26,534
2024-05-17 2024-05-15 PlS Planned sale
1.6
Shaff Eric D.

CEO and President

Executive Director
2,435 -1.7%
0.94
US$2,289 		2,435 -1.7% 0.94 US$2,289
2024-05-17 2024-05-15 PlS Planned sale
1.6
DesRosier Thomas

Chief Legal Officer and EVP

Officer
843 -0.7%
0.94
US$792 		843 -0.7% 0.94 US$792
2024-05-17 2024-05-15 PlS Planned sale
Young Teresa L.

See Remarks

Officer
703 -3.8%
0.94
US$661 		703 -3.8% 0.94 US$661
2024-05-17 2024-05-15 PlS Planned sale
Ege David S.

See Remarks

Officer
1,090 -1.4%
0.94
US$1,025 		1,090 -1.4% 0.94 US$1,025
2024-05-17 2024-05-15 PlS Planned sale
Henn Matthew R.

See Remarks

Officer
891 -1.3%
0.94
US$838 		891 -1.3% 0.94 US$838
2024-05-17 2024-05-15 PlS Planned sale
von Moltke Lisa

See Remarks

Officer
939 -4.7%
0.94
US$883 		939 -4.7% 0.94 US$883
2024-02-16 2024-02-16 PlS Planned sale
Henn Matthew R.

See Remarks

Officer
4,170 -6.2%
1.08
US$4,504 		4,170 -6.2% 1.08 US$4,504
2024-02-16 2024-02-16 PlS Planned sale
1.6
DesRosier Thomas

Chief Legal Officer and EVP

Officer
3,939 -3.2%
1.08
US$4,254 		3,939 -3.2% 1.08 US$4,254
2024-02-16 2024-02-16 PlS Planned sale
Ege David S.

See Remarks

Officer
5,010 -6.4%
1.08
US$5,411 		5,010 -6.4% 1.08 US$5,411
2024-02-16 2024-02-16 PlS Planned sale
1.6
Shaff Eric D.

CEO and President

Executive Director
11,549 -7.9%
1.08
US$12,473 		11,549 -7.9% 1.08 US$12,473
2024-02-16 2024-02-16 PlS Planned sale
1.4
Arkowitz David

Chief Financial Officer

Officer
3,939 -2.1%
1.08
US$4,254 		3,939 -2.1% 1.08 US$4,254
2024-02-16 2024-02-16 PlS Planned sale
Young Teresa L.

See Remarks

Officer
3,374 -17.7%
1.08
US$3,644 		3,374 -17.7% 1.08 US$3,644
2024-02-16 2024-02-16 PlS Planned sale
von Moltke Lisa

See Remarks

Officer
4,400 -20.6%
1.08
US$4,752 		4,400 -20.6% 1.08 US$4,752
2023-10-31 2023-10-30 PlS Planned sale
1.4
Arkowitz David

Chief Financial Officer

Officer
4,066 -2.3%
1.35
US$5,489 		4,066 -2.3% 1.35 US$5,489
2023-10-31 2023-10-30 PlS Planned sale
Henn Matthew R.

See Remarks

Officer
3,886 -6.5%
1.35
US$5,246 		3,886 -6.5% 1.35 US$5,246
2023-10-31 2023-10-30 PlS Planned sale
Cloghessy Paula

See Remarks

Officer
2,904 -6.0%
1.35
US$3,920 		2,904 -6.0% 1.35 US$3,920
2023-10-31 2023-10-30 PlS Planned sale
von Moltke Lisa

See Remarks

Officer
4,232 -30.8%
1.35
US$5,713 		4,232 -30.8% 1.35 US$5,713
2023-10-31 2023-10-30 PlS Planned sale
1.6
Shaff Eric D.

CEO and President

Executive Director
8,552 -6.9%
1.35
US$11,545 		8,552 -6.9% 1.35 US$11,545
2023-10-31 2023-10-30 PlS Planned sale
Ege David S.

See Remarks

Officer
4,066 -5.7%
1.35
US$5,489 		4,066 -5.7% 1.35 US$5,489
2023-10-31 2023-10-30 PlS Planned sale
Young Teresa L.

See Remarks

Officer
2,907 -25.6%
1.35
US$3,924 		2,907 -25.6% 1.35 US$3,924
2023-10-31 2023-10-30 PlS Planned sale
1.6
DesRosier Thomas

Chief Legal Officer and EVP

Officer
4,156 -3.5%
1.35
US$5,611 		4,156 -3.5% 1.35 US$5,611
2023-05-01 2023-04-28 PlS Planned sale
Ege David S.

See Remarks

Officer
7,038 -10.5%
5.19
US$36,527 		7,038 -10.5% 5.19 US$36,527
2022-10-31 2022-10-31 PlS Planned sale
Ege David S.

See Remarks

Officer
5,012 -9.7%
7.93
US$39,745 		5,012 -9.7% 7.93 US$39,745
2022-07-07 2022-07-05 B Purchase
Nutritional Health LTP Fund General Partner LLC
Large shareholder
5,825,495 +inf%
3.15
US$18,350,309 		5,825,495 +inf% 3.15 US$18,350,309
2022-07-07 2022-07-05 B Purchase
Nutritional Health LTP Fund General Partner LLC
Large shareholder
2,912,748 +98.3%
3.15
US$9,175,156 		2,912,748 +98.3% 3.15 US$9,175,156
2020-12-03 2020-12-01 PlS Planned sale
Henn Matthew R.

See Remarks

Officer
9,841 -100.0%
28.34
US$278,894 		9,841 -100.0% 28.34 US$278,894
2020-12-03 2020-12-01 PlS Planned sale
Henn Matthew R.

See Remarks

Officer
26,265 -72.7%
27.56
US$723,863 		26,265 -72.7% 27.56 US$723,863
2020-12-03 2020-12-01 PlS Planned sale
Henn Matthew R.

See Remarks

Officer
55,706 -60.7%
26.56
US$1,479,551 		55,706 -60.7% 26.56 US$1,479,551
2019-11-25 2019-11-22 PlS Planned sale Chapman Marcus

See Remarks

Officer
3,400 -28.3%
3.91
US$13,297 		3,400 -28.3% 3.91 US$13,297
2019-06-20 2019-06-18 B Purchase
3.3
AFEYAN NOUBAR
Large shareholder
4,444,444 +inf%
2.25
US$9,999,999 		4,444,444 +inf% 2.25 US$9,999,999
2019-06-20 2019-06-18 B Purchase
3.3
AFEYAN NOUBAR
Large shareholder
4,444,444 +inf%
2.25
US$9,999,999 		4,444,444 +inf% 2.25 US$9,999,999
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