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Thomas DesRosier

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Insider profile

Currently holds positions in Seres Therapeutics Inc, Genzyme Corp and Cubist Pharmaceuticals LLC

Performance

Overall performance
1.6
Performance over holding periods
1.6
30 days 90 days 120 days
Average return -4% 8.2% 15.1%
Success rate 0% 68% 82%
Transactions
1 0% Buy
34 71% Buy
47 69% Buy
Ranking by holding-period performance

Positions

Position Company Period
Chief Legal Officer, Executive Vice President and Secretary Seres Therapeutics Inc May 1, 2016 -
Chief Legal Officer, Senior Vice President, General Counsel Genzyme Corp May 22, 2008 -
Executive Vice President, Chief Legal and Administrative Officer and Secretary Cubist Pharmaceuticals LLC Feb. 1, 2014 -
Executive Vice President, Chief Legal and Administrative Officer, Secretary ARIAD Pharmaceuticals Inc Jan. 1, 2015 - April 30, 2016
Senior Vice President, General Counsel, Secretary Cubist Pharmaceuticals LLC March 1, 2013 - Feb. 1, 2014
Thomas DesRosier's trades of Seres Therapeutics Inc's stock


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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date Company B/S Transaction type Nb. shares
Price
Value 		Number of shares Price Value Details
2026-05-19 2026-05-18
PlS Planned sale
21,612 -18.4%
466.34
US$3,970,585 		21,612 -18.4% 466.34 US$3,970,585
2026-02-18 2026-02-15
PlS Planned sale
6,919 +10.1%
233.98
US$201,246 		6,919 +10.1% 233.98 US$201,246
2025-11-18 2025-11-15
PlS Planned sale
72,888 -44.4%
441.33
US$1,319,504 		72,888 -44.4% 441.33 US$1,319,504
2025-08-19 2025-08-18
PlS Planned sale
76 -1.0%
16.65
US$1,265 		76 -1.0% 16.65 US$1,265
2025-05-19 2025-05-15
PlS Planned sale
79 -1.1%
7.28
US$575 		79 -1.1% 7.28 US$575
2025-02-19 2025-02-18
PlS Planned sale
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
878 -0.6%
0.54
US$475 		878 -0.6% 0.54 US$475
2024-10-29 2024-10-28
PlS Planned sale
4,259 -3.1%
0.69
US$2,939 		4,259 -3.1% 0.69 US$2,939
2024-08-19 2024-08-16
PlS Planned sale
873 -0.7%
0.84
US$733 		873 -0.7% 0.84 US$733
2024-05-17 2024-05-15
PlS Planned sale
843 -0.7%
0.94
US$792 		843 -0.7% 0.94 US$792
2024-02-16 2024-02-16
PlS Planned sale
3,939 -3.2%
1.08
US$4,254 		3,939 -3.2% 1.08 US$4,254
2023-10-31 2023-10-30
PlS Planned sale
4,156 -3.5%
1.35
US$5,611 		4,156 -3.5% 1.35 US$5,611
2019-01-29 2019-01-28
S Sale
5,471 -25.4%
5.75
US$31,478 		5,471 -25.4% 5.75 US$31,478