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TD

Thomas Desrosier

MCRB
SEE REMARKS · SERES THERAPEUTICS, INC. · CIK 0001435744
FILING MIX · LIFETIME48%/52%
BUYS
29
SELLS
31
TOTAL VALUE
$222.7K
COMPANIES
1
ACTIVE SINCE
Jan 2020
HOLDINGS NOW
7,954
AVG SELL PX
$1.16
TRADE KIND
SHOWING 60 / 60
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
10 backtested trades · 8 horizons · 12 pending
Forward-return performance of every backtestable P/S trade by Thomas Desrosier, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d10+50.00%+4.89%-0.01%+4.90%-0.25%—
14d10+60.00%+2.04%+0.88%+1.16%-3.67%—
30d10+50.00%+4.15%+1.19%+2.95%-1.41%—
60d10+40.00%+12.53%+3.19%+9.34%+2.47%—
90d10+60.00%+3.01%+5.69%-2.68%-17.86%—
180d10(1 pending)+77.78%-15.43%+9.02%-24.45%-37.24%—
1y10(3 pending)+57.14%-2.77%+20.32%-23.09%-22.33%—
2y10(8 pending)+100.00%-49.92%+55.30%-105.22%-105.22%—
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
MCRB · 7,954 shares · as of May 18, 2026
0162,500325,000487,500650,000202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 29 buys / 31 sellsCOVERAGE · 26 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
79$7.53$5957,954May 18, 2026May 19, 2026 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
See Remarks
133——398May 15, 2026May 19, 2026 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
See Remarks
111——779May 15, 2026May 19, 2026 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
See Remarks
244——8,033May 15, 2026May 19, 2026 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
22,500——22,500Mar 4, 2026Mar 6, 2026 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
See Remarks
133——531Feb 15, 2026Feb 18, 2026 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
78$8.47$6617,789Feb 15, 2026Feb 18, 2026 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
See Remarks
111——890Feb 15, 2026Feb 18, 2026 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
See Remarks
244——7,867Feb 15, 2026Feb 18, 2026 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
See Remarks
112——1,001Nov 15, 2025Nov 18, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
See Remarks
112——7,699Nov 15, 2025Nov 18, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
76$17.30$1.3K7,623Nov 15, 2025Nov 18, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
See Remarks
132——664Nov 15, 2025Nov 18, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
See Remarks
132——7,587Nov 15, 2025Nov 18, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
76$16.65$1.3K7,455Aug 18, 2025Aug 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
See Remarks
111——7,531Aug 15, 2025Aug 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
See Remarks
111——1,113Aug 15, 2025Aug 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
See Remarks
133——7,420Aug 15, 2025Aug 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
See Remarks
133——796Aug 15, 2025Aug 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Legal Officer and EVP
111——1,224May 15, 2025May 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Legal Officer and EVP
133——7,255May 15, 2025May 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
79$7.28$5757,287May 15, 2025May 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Legal Officer and EVP
111——7,366May 15, 2025May 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Legal Officer and EVP
133——929May 15, 2025May 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
4,300$0.81$3.5K142,456Feb 18, 2025Feb 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Legal Officer and EVP
8,907——26,718Feb 15, 2025Feb 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Legal Officer and EVP
8,907——146,756Feb 15, 2025Feb 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Legal Officer and EVP
2,657——21,250Feb 15, 2025Feb 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Legal Officer and EVP
2,657——137,849Feb 15, 2025Feb 19, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
650,000——650,000Feb 7, 2025Feb 11, 2025 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
878$0.54$475135,192Nov 18, 2024Nov 19, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Legal Officer and EVP
2,656——136,070Nov 15, 2024Nov 19, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Legal Officer and EVP
2,656——23,907Nov 15, 2024Nov 19, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
4,259$0.69$2.9K133,414Oct 28, 2024Oct 29, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Legal Officer and EVP
13,500——0Oct 27, 2024Oct 29, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Legal Officer and EVP
13,500——137,673Oct 27, 2024Oct 29, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
873$0.84$733124,173Aug 16, 2024Aug 19, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Legal Officer and EVP
2,656——125,046Aug 15, 2024Aug 19, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Legal Officer and EVP
2,656——26,563Aug 15, 2024Aug 19, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
843$0.94$792122,390May 15, 2024May 17, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Legal Officer and EVP
2,656——29,219May 15, 2024May 17, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Legal Officer and EVP
2,656——123,233May 15, 2024May 17, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
3,939$1.08$4.3K120,577Feb 16, 2024Feb 16, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Legal Officer and EVP
10,625——31,875Feb 15, 2024Feb 16, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Legal Officer and EVP
10,625——124,516Feb 15, 2024Feb 16, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
287,905——287,905Feb 14, 2024Feb 16, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
35,625——35,625Feb 14, 2024Feb 16, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
213,750——213,750Feb 14, 2024Feb 16, 2024 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
4,156$1.35$5.6K113,891Oct 30, 2023Oct 31, 2023 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Legal Officer and EVP
13,501——118,047Oct 27, 2023Oct 31, 2023 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Legal Officer and EVP
13,501——13,500Oct 27, 2023Oct 31, 2023 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
27,001——27,001Apr 27, 2023Oct 31, 2023 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
42,500——42,500Feb 3, 2023Feb 7, 2023 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
85,000——85,000Feb 3, 2023Feb 7, 2023 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
63,492$3.15$200.0K104,546Jul 5, 2022Jul 6, 2022 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
130,000——130,000Feb 4, 2022Feb 8, 2022 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
100,000——100,000Feb 4, 2021Feb 8, 2021 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
350,000——350,000Jan 29, 2020Jan 31, 2020 ↗View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Legal Officer and EVP
25,000——0Jan 26, 2020Jan 28, 2020 ↗View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Legal Officer and EVP
25,000——41,054Jan 26, 2020Jan 28, 2020 ↗View →
Other insiders · MCRB
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About this filer
CIK 0001435744
ROLE
See Remarks
PRIMARY
MCRB
COMPANIES
1
ACTIVE SINCE
Jan 2020
MARKETPEEL · /INSIDER/0001435744DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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