EcoR1 Capital, LLC

Insider

10% Owner

Trades at: ATRA· TRAX· ADAP· ZYME· ITOS· PRTA· ANAB· MRSN +5 more

30D 90D 1Y

Net shares · 90d

-4.2M

507.4K buy · 4.7M sell

Net value · 90d

-$60.3M

$4.7M in · $65.0M out

Sentiment · 90d

Net selling

7% buying · 93% selling

Open-market trades · 90d

507.4K buy · 4.7M sell

Net buy / sell volume (all companies)

Tap or hover the chart for daily net volume. Green = net buying, red = net selling.

All transactions · open-market

Include grants & non-market

ATRA Buy·P
May 7, 26

10% Owner

$4.7M

507.4K sh · $9.35

Own +49%
TRAX Sell·S
Apr 20, 26

10% Owner

$65.0M

4.7M sh · $13.81

Own -60%

Date▾	Ticker	Role	Type	Shares	Own Δ	Price	Value
May 7, 2026	ATRA	10% Owner	Buy P	507.4K	+49%	$9.35	$4.7M
Apr 20, 2026	TRAX	10% Owner	Sell S	4.7M	-60%	$13.81	$65.0M

About EcoR1 Capital, LLC

This profile aggregates every SEC Form 4 insider transaction reported by EcoR1 Capital, LLC across all companies they trade. Open-market purchases (code P) and sales (code S) are the highest-signal, discretionary trades; grants (A), option exercises (M) and gifts (G) reflect compensation rather than conviction and carry no market price. Figures cover the selected period and update as new filings are ingested.