MarketPeel
Insider Trading Intelligence
WB

William W. Brooke

MXCT
DIRECTOR · MAXCYTE, INC. · CIK 0001545337
FILING MIX · LIFETIME100%/0%
BUYS
10
SELLS
0
TOTAL VALUE
$64.5K
COMPANIES
1
ACTIVE SINCE
Aug 2021
HOLDINGS NOW
49,579
AVG SELL PX
TRADE KIND
SHOWING 10 / 10
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
1 backtested trades · 8 horizons · 2 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by William W. Brooke, 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
7d1+100.00%+0.72%-1.05%+1.78%+1.78%
14d1+100.00%+1.45%+0.27%+1.18%+1.18%
30d1+100.00%+5.07%+1.94%+3.13%+3.13%
60d1+100.00%+15.94%+2.81%+13.13%+13.13%
90d1+100.00%+12.32%+5.91%+6.41%+6.41%
180d1+0.00%-42.68%+7.61%-50.29%-50.29%
1y1(1 pending)
2y1(1 pending)
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
MXCT · 49,579 shares · as of Jun 17, 2026
045,32590,650135,975181,30020222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 10 buys / 0 sellsCOVERAGE · 20 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
MXCT
MAXCYTE, INC.
PURCHASEGRANT
Stock grant
49,57949,579Jun 17, 2026Jun 22, 2026View →
MXCT
MAXCYTE, INC.
PURCHASEGRANT
Stock grant
30,421181,300Jun 17, 2026Jun 22, 2026View →
MXCT
MAXCYTE, INC.
PURCHASE
50,000$1.29$64.5K150,879Aug 13, 2025Aug 13, 2025View →
MXCT
MAXCYTE, INC.
PURCHASEGRANT
Stock grant
50,79050,790Jun 18, 2025Jun 23, 2025View →
MXCT
MAXCYTE, INC.
PURCHASEGRANT
Stock grant
29,210100,879Jun 18, 2025Jun 23, 2025View →
MXCT
MAXCYTE, INC.
PURCHASEGRANT
Stock grant
21,36771,669Jun 11, 2024Jun 13, 2024View →
MXCT
MAXCYTE, INC.
PURCHASEGRANT
Stock grant
40,70140,701Jun 11, 2024Jun 13, 2024View →
MXCT
MAXCYTE, INC.
PURCHASEGRANT
Stock grant
50,00050,000Jun 22, 2023Jun 23, 2023View →
MXCT
MAXCYTE, INC.
PURCHASEGRANT
Stock grant
26,90026,900Jun 29, 2022Jul 8, 2022View →
MXCT
MAXCYTE, INC.
PURCHASEGRANT
Stock grant
10,00010,000Aug 9, 2021Aug 11, 2021View →
Other insiders · MXCT
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About this filer
CIK 0001545337
ROLE
Director
PRIMARY
MXCT
COMPANIES
1
ACTIVE SINCE
Aug 2021
MARKETPEEL · /INSIDER/0001545337DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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