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Jacquelyn L. Sumer

CGEM
CHIEF LEGAL OFFICER · CULLINAN THERAPEUTICS, INC. · CIK 0001844824
FILING MIX · LIFETIME45%/55%
BUYS
9
SELLS
11
TOTAL VALUE
$256.9K
COMPANIES
1
ACTIVE SINCE
Aug 2022
HOLDINGS NOW
130,559
AVG SELL PX
$11.26
TRADE KIND
SHOWING 20 / 20
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
11 backtested trades · 8 horizons · 10 pending
Forward-return performance of every backtestable P/S trade by Jacquelyn L. Sumer, 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
7d11+18.18%+4.23%-0.04%+4.27%+4.48%
14d11+27.27%+4.83%-0.42%+5.24%+7.73%
30d11+63.64%+3.49%+0.57%+2.91%+1.13%
60d11+45.45%+18.73%+3.25%+15.48%+2.15%
90d11+36.36%+15.08%+4.60%+13.01%+7.92%
180d11(2 pending)+55.56%+16.56%+10.14%+6.42%-19.18%
1y11(3 pending)+12.50%+52.14%+24.93%+27.21%+5.70%
2y11(5 pending)+66.67%-14.81%+42.40%-57.21%-57.07%
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
CGEM · 130,559 shares · as of Jun 30, 2026
057,500115,000172,500230,0002023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 9 buys / 11 sellsCOVERAGE · 16 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
CGEM
CULLINAN THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
2,470$8.60$21.2K130,559Jun 30, 2026Jul 2, 2026View →
CGEM
CULLINAN THERAPEUTICS, INC.
SALE
Chief Legal Officer
3,601$14.47$52.1K128,089Feb 24, 2026Feb 25, 2026View →
CGEM
CULLINAN THERAPEUTICS, INC.
SALE
Chief Legal Officer
3,742$13.62$51.0K131,690Feb 20, 2026Feb 23, 2026View →
CGEM
CULLINAN THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
230,000230,000Feb 18, 2026Feb 19, 2026View →
CGEM
CULLINAN THERAPEUTICS, INC.
SALE
Chief Legal Officer
3,480$9.67$33.7K135,432Dec 18, 2025Dec 19, 2025View →
CGEM
CULLINAN THERAPEUTICS, INC.
SALE
Chief Legal Officer
3,756$8.53$32.0K136,895Feb 25, 2025Feb 27, 2025View →
CGEM
CULLINAN THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
50,000140,651Feb 19, 2025Feb 21, 2025View →
CGEM
CULLINAN THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
100,000100,000Feb 19, 2025Feb 21, 2025View →
CGEM
CULLINAN THERAPEUTICS, INC.
SALE
Chief Legal Officer
3,482$11.41$39.7K90,651Dec 18, 2024Dec 20, 2024View →
CGEM
CULLINAN THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
100,000100,000Feb 22, 2024Feb 23, 2024View →
CGEM
CULLINAN THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
50,00094,133Feb 22, 2024Feb 23, 2024View →
CGEM
CULLINAN THERAPEUTICS, INC.
SALE
Chief Legal Officer
1,400$8.50$11.9K44,133Dec 21, 2023Dec 22, 2023View →
CGEM
CULLINAN THERAPEUTICS, INC.
SALE
Chief Legal Officer
290$8.22$2.4K45,533Dec 18, 2023Dec 20, 2023View →
CGEM
CULLINAN THERAPEUTICS, INC.
SALE
Chief Legal Officer
291$12.94$3.8K45,823Jun 20, 2023Jun 21, 2023View →
CGEM
CULLINAN THERAPEUTICS, INC.
SALE
Chief Legal Officer
291$8.76$2.5K46,114May 18, 2023May 19, 2023View →
CGEM
CULLINAN THERAPEUTICS, INC.
SALE
Chief Legal Officer
290$10.71$3.1K46,405Apr 18, 2023Apr 20, 2023View →
CGEM
CULLINAN THERAPEUTICS, INC.
SALE
Chief Legal Officer
305$11.32$3.5K46,695Mar 20, 2023Mar 27, 2023View →
CGEM
CULLINAN THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
93,50093,500Feb 17, 2023Feb 21, 2023View →
CGEM
CULLINAN THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
47,00047,000Feb 17, 2023Feb 21, 2023View →
CGEM
CULLINAN THERAPEUTICS, INC.
PURCHASEGRANT
Stock grant
190,000190,000Aug 15, 2022Aug 16, 2022View →
Other insiders · CGEM
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About this filer
CIK 0001844824
ROLE
Chief Legal Officer
PRIMARY
CGEM
COMPANIES
1
ACTIVE SINCE
Aug 2022
MARKETPEEL · /INSIDER/0001844824DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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