MarketPeel
Insider Trading Intelligence
DA

David Arkowitz

MCRB
CHIEF FINANCIAL OFFICER · SERES THERAPEUTICS, INC. · CIK 0001296999
FILING MIX · LIFETIME78%/22%
BUYS
18
SELLS
5
TOTAL VALUE
$259.7K
COMPANIES
2
ACTIVE SINCE
Jun 2021
HOLDINGS NOW
195,942
AVG SELL PX
$1.22
TRADE KIND
SHOWING 23 / 23
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
2 backtested trades · 8 horizons · 1 pending
Forward-return performance of every backtestable P/S trade by David Arkowitz, 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
7d2+50.00%+5.97%+2.31%+3.66%+3.66%
14d2+50.00%+18.77%+3.70%+15.06%+15.06%
30d2+100.00%+3.17%+3.59%-0.43%-0.43%
60d2+100.00%+42.45%-1.56%+44.01%+44.01%
90d2+50.00%-32.26%-1.59%-30.66%-30.66%
180d2+50.00%-40.52%+8.69%-49.21%-49.21%
1y2+100.00%-7.41%+21.78%-29.18%-29.18%
2y2(1 pending)+100.00%-59.67%+38.65%-98.32%-98.32%
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 · 182,442 shares · as of Feb 16, 2024
071,976143,953215,929287,905202220232024SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
FLOW · 18 buys / 5 sellsCOVERAGE · 19 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
IBIO
IBIO, INC.
PURCHASEGRANT
Stock grant
13,50013,500Nov 20, 2025Nov 24, 2025View →
IBIO
IBIO, INC.
PURCHASE
18,382$2.72$50.0K18,382Jan 10, 2025Jan 13, 2025View →
IBIO
IBIO, INC.
PURCHASEGRANT
Stock grant
12,60012,600Nov 21, 2024Nov 25, 2024View →
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
3,939$1.08$4.3K182,442Feb 16, 2024Feb 16, 2024View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Financial Officer
10,625186,381Feb 15, 2024Feb 16, 2024View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Financial Officer
10,62531,875Feb 15, 2024Feb 16, 2024View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
35,62535,625Feb 14, 2024Feb 16, 2024View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
213,750213,750Feb 14, 2024Feb 16, 2024View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
287,905287,905Feb 14, 2024Feb 16, 2024View →
MCRB
SERES THERAPEUTICS, INC.
SALE10b5-1
10b5-1 plan
4,066$1.35$5.5K175,756Oct 30, 2023Oct 31, 2023View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Financial Officer
13,20913,209Oct 27, 2023Oct 31, 2023View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Financial Officer
13,209179,822Oct 27, 2023Oct 31, 2023View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
42,500166,613Apr 27, 2023May 1, 2023View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
26,41826,418Apr 27, 2023Oct 31, 2023View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
85,00085,000Feb 3, 2023Feb 7, 2023View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
42,50042,500Feb 3, 2023Feb 7, 2023View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
42,500112,992Oct 27, 2022Oct 31, 2022View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
63,492$3.15$200.0K65,492Jul 5, 2022Jul 6, 2022View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASE
Chief Financial Officer
5,00070,492Jun 15, 2022Oct 31, 2022View →
MCRB
SERES THERAPEUTICS, INC.
SALE
Chief Financial Officer
5,0000Jun 15, 2022Oct 31, 2022View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
190,000190,000Feb 4, 2022Feb 8, 2022View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
5,0005,000Jun 1, 2021Jun 1, 2021View →
MCRB
SERES THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
270,000270,000Jun 1, 2021Jun 1, 2021View →
Other insiders · MCRB
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About this filer
CIK 0001296999
ROLE
Chief Financial Officer
PRIMARY
MCRB
COMPANIES
2
ACTIVE SINCE
Jun 2021
MARKETPEEL · /INSIDER/0001296999DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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