MarketPeel
Insider Trading Intelligence
JZ

James Ziegler

GERN
EVP, CHIEF COMMERCIAL OFFICER · GERON CORP · CIK 0002035113
FILING MIX · LIFETIME75%/25%
BUYS
3
SELLS
1
TOTAL VALUE
$160.0K
COMPANIES
1
ACTIVE SINCE
Sep 2024
HOLDINGS NOW
100,000
AVG SELL PX
TRADE KIND
SHOWING 4 / 4
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
1 backtested trades · 8 horizons · 1 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by James Ziegler, 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+0.00%-1.15%-2.11%+0.96%+0.96%
14d1+0.00%-4.02%-5.75%+1.73%+1.73%
30d1+0.00%-5.17%-4.74%-0.43%-0.43%
60d1+0.00%-19.54%-5.56%-13.98%-13.98%
90d1+0.00%-16.67%+0.76%-17.43%-17.43%
180d1+0.00%-16.09%+10.61%-26.70%-26.70%
1y1+0.00%-3.45%+17.61%-21.05%-21.05%
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
GERN · 100,000 shares · as of Feb 27, 2025
0400,000800,0001,200,0001,600,0002025SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2024
2024
2025
FLOW · 3 buys / 1 sellsCOVERAGE · 3 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
GERN
GERON CORP
PURCHASE
EVP, Chief Commercial Officer
100,000$1.60$160.0K100,000Feb 27, 2025Mar 3, 2025View →
GERN
GERON CORP
PURCHASEGRANT
Stock grant
529,000529,000Feb 18, 2025Feb 20, 2025View →
GERN
GERON CORP
PURCHASEGRANT
Stock grant
89,00089,000Feb 18, 2025Feb 20, 2025View →
GERN
GERON CORP
SALEGRANT
Stock grant
1,600,0001,600,000Sep 9, 2024Sep 9, 2024View →
Other insiders · GERN
Loading peer insiders…
About this filer
CIK 0002035113
ROLE
EVP, Chief Commercial Officer
PRIMARY
GERN
COMPANIES
1
ACTIVE SINCE
Sep 2024
MARKETPEEL · /INSIDER/0002035113DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
FREE · DAILY · 6 AM ET

One short email. Insider buys, congressional trades, and plain-English analysis.

Feedback