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Seres Therapeutics, Inc.

MCRB Net buying
CIK 0001609809 #4740 in the set updated 17 Sep 2026
Bought (120 mo)
$47.53M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$6.05M
$177.13K on a plan · $3.83M straight out of an exercise
Sold at will
$2.04M
22 of 106 sales
Net
+$41.48M
+$45.48M against sales at will

By person

22 insiders · 112 transactions
Insider
Role
Bought
Sold
Net
Holding
Worth
Change
Nutritional Health LTP Fund General Partner LLC entity
10% owner
$27.53M (2)
+$27.53M
6,201,513
$28.22M
AFEYAN NOUBAR
Director
$20.00M (2)
+$20.00M
2,750,135
$12.51M
Henn Matthew R
See Remarks
$2.53M (16) scheduled
−$2.53M
7,995
$36.38K
Pomerantz Roger
Director
$2.06M (16) scheduled
−$2.06M
213,976
$973.59K
+16.5%
Aunins John G.
Chief Technology Officer & EVP
$1.00M (11)
−$1.00M
105,250
$478.89K
−45.2%
Shaff Eric D.
Director
$116.26K (15) scheduled
−$116.26K
12,499
$56.87K
DesRosier Thomas
See Remarks
$92.85K (15) scheduled
−$92.85K
8,117
$36.93K
Ege David S.
See Remarks
$89.14K (6)
−$89.14K
77,575
$352.97K
Young Teresa L.
See Remarks
$60.64K (12) scheduled
−$60.64K
8,557
$38.93K
Trucksis Michele
See Remarks
$28.73K (1) scheduled
−$28.73K
4,893
$22.26K
von Moltke Lisa
See Remarks
$19.26K (7) scheduled
−$19.26K
39,875
$181.43K
COOK DAVID N
See Remarks
$19.15K (1) scheduled
−$19.15K
147,435
$670.83K
+7.9%
Chapman Marcus
See Remarks
$13.30K (1)
−$13.30K
8,600
$39.13K
Arkowitz David
Chief Financial Officer
$9.74K (2) scheduled
−$9.74K
182,442
$830.11K
+1,290%
Cloghessy Paula
See Remarks
$3.92K (1) scheduled
−$3.92K
45,684
$207.86K
+515.4%
Brady Kelly
See Remarks
$735.47 (2)
−$735.47
8,679
$39.49K
+2.8%
Flagship Ventures Fund IV General Partner LLC entity
10% owner
376,018
$1.71M
−95.5%
Kender Richard N
See Remarks
63,492
$288.89K
Biondi Paul
Director
47,619
$216.67K
Dere Willard H
Director
31,746
$144.44K
Zausner Meryl
Director
31,746
$144.44K
Berenson Stephen
Director
3,589
$16.33K

No percentages here. This company's share count has moved by a factor of 19.9 over the window, from 8,754,570 to 174,358,753 shares. A split, a merger or a large issue changes what the company is, and a holding measured at one point in that run is not a fraction of it at another.

Insider
Date
Role
Action
Shares
Price
Amount
DesRosier Thomas
17 Aug 2026
See Remarks
Sold on a plan
82
$4.55
$373.10
Henn Matthew R
17 Aug 2026
See Remarks
Sold on a plan
81
$4.55
$368.55
Shaff Eric D.
17 Aug 2026
Director
Sold on a plan
263
$4.55
$1.20K
Brady Kelly
17 Aug 2026
See Remarks
Sold on a plan
64
$4.55
$291.20
Henn Matthew R
18 May 2026
See Remarks
Sold on a plan
77
$7.53
$579.81
Brady Kelly
18 May 2026
See Remarks
Sell
59
$7.53
$444.27
DesRosier Thomas
18 May 2026
See Remarks
Sold on a plan
79
$7.53
$594.87
Shaff Eric D.
18 May 2026
Director
Sold on a plan
259
$7.53
$1.95K
Henn Matthew R
15 Feb 2026
See Remarks
Sold after exercise
89
$8.47
$753.83
DesRosier Thomas
15 Feb 2026
See Remarks
Sold after exercise
78
$8.47
$660.66
Young Teresa L.
15 Feb 2026
See Remarks
Sold after exercise
75
$8.47
$635.25
Shaff Eric D.
15 Feb 2026
Director
Sold after exercise
259
$8.47
$2.19K
Henn Matthew R
15 Nov 2025
See Remarks
Sold after exercise
1,257
$17.30
$21.75K
DesRosier Thomas
15 Nov 2025
See Remarks
Sold after exercise
76
$17.30
$1.31K
Shaff Eric D.
15 Nov 2025
Director
Sold after exercise
217
$17.30
$3.75K
Young Teresa L.
15 Nov 2025
See Remarks
Sold after exercise
1,042
$17.30
$18.03K
Young Teresa L.
18 Aug 2025
See Remarks
Sold on a plan
59
$16.65
$982.35
Henn Matthew R
18 Aug 2025
See Remarks
Sold on a plan
73
$16.65
$1.22K
DesRosier Thomas
18 Aug 2025
See Remarks
Sold on a plan
76
$16.65
$1.27K
Shaff Eric D.
18 Aug 2025
Director
Sold on a plan
217
$16.65
$3.61K
Henn Matthew R
16 May 2025
See Remarks
Sold on a plan
77
$7.28
$560.56
Shaff Eric D.
16 May 2025
CEO and President
Sold on a plan
220
$7.28
$1.60K
Young Teresa L.
16 May 2025
See Remarks
Sold on a plan
63
$7.28
$458.64
DesRosier Thomas
15 May 2025
Chief Legal Officer and EVP
Sold after exercise
79
$7.28
$575.12
von Moltke Lisa
18 Feb 2025
See Remarks
Sold on a plan
4,416
$0.81
$3.58K
DesRosier Thomas
18 Feb 2025
Chief Legal Officer and EVP
Sold on a plan
4,300
$0.81
$3.49K
Shaff Eric D.
18 Feb 2025
CEO and President
Sold on a plan
12,726
$0.81
$10.31K
Henn Matthew R
18 Feb 2025
See Remarks
Sold on a plan
3,953
$0.81
$3.20K
Young Teresa L.
18 Feb 2025
See Remarks
Sold on a plan
3,338
$0.81
$2.70K
Henn Matthew R
18 Nov 2024
See Remarks
Sold on a plan
927
$0.54
$501.23
Shaff Eric D.
18 Nov 2024
CEO and President
Sold on a plan
2,505
$0.54
$1.35K
Young Teresa L.
18 Nov 2024
See Remarks
Sold on a plan
735
$0.54
$397.64
von Moltke Lisa
18 Nov 2024
See Remarks
Sold on a plan
977
$0.54
$528.26
DesRosier Thomas
18 Nov 2024
Chief Legal Officer and EVP
Sold on a plan
878
$0.54
$474.73
Young Teresa L.
28 Oct 2024
See Remarks
Sold on a plan
2,983
$0.69
$2.06K
Shaff Eric D.
28 Oct 2024
CEO and President
Sold on a plan
8,748
$0.69
$6.04K
DesRosier Thomas
28 Oct 2024
Chief Legal Officer and EVP
Sold on a plan
4,259
$0.69
$2.94K
Henn Matthew R
28 Oct 2024
See Remarks
Sold on a plan
3,984
$0.69
$2.75K
von Moltke Lisa
28 Oct 2024
See Remarks
Sold on a plan
4,334
$0.69
$2.99K
Ege David S.
16 Aug 2024
See Remarks
Sold on a plan
1,128
$0.84
$947.52
Young Teresa L.
16 Aug 2024
See Remarks
Sold on a plan
728
$0.84
$611.52
Shaff Eric D.
16 Aug 2024
CEO and President
Sold on a plan
2,518
$0.84
$2.12K
Henn Matthew R
16 Aug 2024
See Remarks
Sold on a plan
923
$0.84
$775.32
von Moltke Lisa
16 Aug 2024
See Remarks
Sold on a plan
973
$0.84
$817.32
DesRosier Thomas
16 Aug 2024
Chief Legal Officer and EVP
Sold on a plan
873
$0.84
$733.32
Young Teresa L.
5 Aug 2024
See Remarks
Sold on a plan
24,480
$1.08
$26.53K
DesRosier Thomas
15 May 2024
Chief Legal Officer and EVP
Sold after exercise
843
$0.94
$792.42
Ege David S.
15 May 2024
See Remarks
Sold after exercise
1,090
$0.94
$1.02K
Henn Matthew R
15 May 2024
See Remarks
Sold after exercise
891
$0.94
$837.54
Young Teresa L.
15 May 2024
See Remarks
Sold after exercise
703
$0.94
$660.82
Shaff Eric D.
15 May 2024
CEO and President
Sold after exercise
2,435
$0.94
$2.29K
von Moltke Lisa
15 May 2024
See Remarks
Sold after exercise
939
$0.94
$882.66
Arkowitz David
16 Feb 2024
Chief Financial Officer
Sold on a plan
3,939
$1.08
$4.25K
Ege David S.
16 Feb 2024
See Remarks
Sold on a plan
5,010
$1.08
$5.41K
von Moltke Lisa
16 Feb 2024
See Remarks
Sold on a plan
4,400
$1.08
$4.75K
Young Teresa L.
16 Feb 2024
See Remarks
Sold on a plan
3,374
$1.08
$3.64K
Henn Matthew R
16 Feb 2024
See Remarks
Sold on a plan
4,170
$1.08
$4.50K
Shaff Eric D.
16 Feb 2024
CEO and President
Sold on a plan
11,549
$1.08
$12.47K
DesRosier Thomas
16 Feb 2024
Chief Legal Officer and EVP
Sold on a plan
3,939
$1.08
$4.25K
Henn Matthew R
30 Oct 2023
See Remarks
Sold on a plan
3,886
$1.35
$5.25K
von Moltke Lisa
30 Oct 2023
See Remarks
Sold on a plan
4,232
$1.35
$5.71K
Ege David S.
30 Oct 2023
See Remarks
Sold on a plan
4,066
$1.35
$5.49K
DesRosier Thomas
30 Oct 2023
Chief Legal Officer and EVP
Sold on a plan
4,156
$1.35
$5.61K
Arkowitz David
30 Oct 2023
Chief Financial Officer
Sold on a plan
4,066
$1.35
$5.49K
Young Teresa L.
30 Oct 2023
See Remarks
Sold on a plan
2,907
$1.35
$3.92K
Shaff Eric D.
30 Oct 2023
CEO and President
Sold on a plan
8,552
$1.35
$11.55K
Cloghessy Paula
30 Oct 2023
See Remarks
Sold on a plan
2,904
$1.35
$3.92K
Ege David S.
28 Apr 2023
See Remarks
Sell
7,038
$5.19
$36.53K
Ege David S.
31 Oct 2022
See Remarks
Sell
5,012
$7.93
$39.75K
Nutritional Health LTP Fund General Partner LLC
5 Jul 2022
10% owner
Buy indirect
5,825,495
$3.15
$18.35M
Nutritional Health LTP Fund General Partner LLC
5 Jul 2022
10% owner
Buy indirect
2,912,748
$3.15
$9.18M
Henn Matthew R
1 Dec 2020
See Remarks
Sold after exercise
9,841
$28.34
$278.89K
Henn Matthew R
1 Dec 2020
See Remarks
Sold after exercise
26,265
$27.56
$723.86K
Henn Matthew R
1 Dec 2020
See Remarks
Sold after exercise
55,706
$26.56
$1.48M
Chapman Marcus
22 Nov 2019
See Remarks
Sell
3,400
$3.91
$13.30K
AFEYAN NOUBAR
18 Jun 2019
Director
Buy indirect
4,444,444
$2.25
$10.00M
AFEYAN NOUBAR
18 Jun 2019
Director
Buy indirect
4,444,444
$2.25
$10.00M
Shaff Eric D.
28 Jan 2019
See Remarks
Sell
4,378
$5.75
$25.19K
DesRosier Thomas
28 Jan 2019
Chief Legal Officer and EVP
Sell
5,471
$5.75
$31.48K
Aunins John G.
17 Dec 2018
Chief Technology Officer & EVP
Sell
14,282
$6.39
$91.31K
Aunins John G.
15 Nov 2018
See Remarks
Sell
14,279
$8.26
$117.91K
Aunins John G.
15 Oct 2018
See Remarks
Sell
14,279
$5.94
$84.80K
Aunins John G.
17 Sep 2018
See Remarks
Sell
14,279
$7.27
$103.88K
Pomerantz Roger
7 Sep 2018
President and CEO
Sell
1,810
$9.00
$16.29K
Pomerantz Roger
6 Sep 2018
President and CEO
Sell
3,013
$9.04
$27.24K
Pomerantz Roger
5 Sep 2018
President and CEO
Sell
9,505
$9.12
$86.71K
Aunins John G.
15 Aug 2018
See Remarks
Sell
14,279
$7.57
$108.07K
Aunins John G.
15 Jul 2018
Chief Technology Officer & EVP
Sell
14,279
$8.10
$115.73K
Pomerantz Roger
11 Jul 2018
President and CEO
Sold after exercise
1,010
$9.01
$9.10K
Pomerantz Roger
10 Jul 2018
President and CEO
Sold after exercise
5,989
$9.05
$54.21K
Pomerantz Roger
9 Jul 2018
President and CEO
Sold after exercise
10,981
$9.14
$100.35K
Pomerantz Roger
6 Jul 2018
President and CEO
Sold after exercise
15,366
$9.14
$140.51K
Pomerantz Roger
29 Jun 2018
President and CEO
Sold after exercise
4,496
$9.10
$40.92K
Pomerantz Roger
28 Jun 2018
President and CEO
Sold after exercise
21,560
$9.15
$197.38K
Pomerantz Roger
27 Jun 2018
President and CEO
Sold after exercise
16,991
$9.03
$153.41K
Pomerantz Roger
26 Jun 2018
President and CEO
Sold after exercise
21,224
$9.19
$195.13K
Pomerantz Roger
25 Jun 2018
President and CEO
Sold after exercise
26,752
$9.21
$246.50K
Pomerantz Roger
22 Jun 2018
President and CEO
Sell
40,057
$9.36
$374.76K
Pomerantz Roger
21 Jun 2018
President and CEO
Sell
18,987
$9.06
$172.09K
Pomerantz Roger
20 Jun 2018
President and CEO
Sell
26,492
$9.33
$247.05K
Aunins John G.
15 Jun 2018
Chief Technology Officer & EVP
Sell
14,279
$8.57
$122.33K
Aunins John G.
15 May 2018
See Remarks
Sell
14,279
$8.08
$115.40K
Pomerantz Roger
9 May 2018
President and CEO
Sell
233
$9.00
$2.10K
Aunins John G.
25 Apr 2018
Chief Technology Officer & EVP
Sell
14,279
$7.58
$108.27K
COOK DAVID N
26 Jan 2018
See Remarks
Sold after exercise
1,738
$11.02
$19.15K
Trucksis Michele
26 Jan 2018
See Remarks
Sold after exercise
2,607
$11.02
$28.73K
DesRosier Thomas
26 Jan 2018
See Remarks
Sold after exercise
3,475
$11.02
$38.29K
Shaff Eric D.
26 Jan 2018
See Remarks
Sold after exercise
2,780
$11.02
$30.64K
Aunins John G.
26 Jan 2018
See Remarks
Sold after exercise
1,738
$11.02
$19.15K
Pomerantz Roger
24 Jan 2018
President and CEO
Exercised, kept
40,241
$0.71
$28.57K
Aunins John G.
19 Dec 2017
Chief Technology Officer & EVP
Sold after exercise
1,623
$10.14
$16.46K
Pomerantz Roger
18 Jul 2017
President and CEO
Exercised, kept
100,604
$0.71
$71.43K

What was left out

Form 4 filings counted 279
Amendments (4/A) skipped 1
Filings about a different issuer 0
Unreadable filings 0
Joint filings 3
Sales on a Rule 10b5-1 plan 51
Sales straight out of an exercise 33
Sales at will 22
Transactions with no price 0
Shares from compensation/vesting 9,854,506
Sales filed before the plan box existed 20
History held since 20 Sep 2016