EC
UPB

EcoR1 Capital’s Upstream Bio, Inc. Common Stock UPB Stock Holding History

EcoR1 Capital’s Portfolio UPB Stock Details UPB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Shares
Change % 		Capital Flow Portfolio Weight Portfolio Position
2025
Q2 		– Sell
-60,000
Closed -$367K – 49
2025
Q1 		$367K Hold
60,000
– – 0.02% 44
2024
Q4 		$986K Buy
+60,000
New +$986K 0.04% 52