ACM
UPB

ADAR1 Capital Management’s Upstream Bio Inc UPB Stock Holding History

ADAR1 Capital Management’s Portfolio UPB Stock Details UPB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		– Sell
-35,000
Closed -$315K – 353
2026
Q1 		$315K Buy
+35,000
New +$630K 0.02% 236
2025
Q2 		– Sell
-15,000
Closed -$91.8K – 244
2025
Q1 		$91.8K Buy
+15,000
New +$143K 0.02% 169

Other funds holding UPB

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
O
OrbiMed New York $5.4B AUM 163.13% 1-Year Est. Return
Norges Bank
Norges Bank Oslo, Norway $1T AUM
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
DC
Decheng Capital Menlo Park, California $732M AUM 275.56% 1-Year Est. Return
ES
Enavate Sciences Menlo Park, California $345M AUM 134.64% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

ADAR1 Capital Management's UPB Position: Q2 2026 in Review

ADAR1 Capital Management sold out of Upstream Bio Inc (UPB) in Q2 2026, closing a stake of 35,000 shares — an estimated $315K sold.

ADAR1 Capital Management first reported a position in UPB in Q1 2025 and held it in 2 quarters. The position peaked at $315K in Q1 2026. 148 funds tracked by Wall St. Rank hold UPB as of Q2 2026.

  • ADAR1 Capital Management reported no remaining Upstream Bio Inc position as of Q2 2026 after selling out during the quarter.
  • ADAR1 Capital Management sold 35,000 Upstream Bio Inc shares in Q2 2026, an estimated $315K.
  • ADAR1 Capital Management first reported a position in Upstream Bio Inc in Q1 2025 and held it in 2 quarters.
  • ADAR1 Capital Management's Upstream Bio Inc position peaked at $315K in Q1 2026.
  • 148 funds tracked by Wall St. Rank held Upstream Bio Inc as of Q2 2026.

Based on ADAR1 Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.