PAP
UPB

Persistent Asset Partners’s Upstream Bio Inc UPB Stock Holding History

Persistent Asset Partners’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 		$33.6K Sell
4,855
-640
-12% -$5.36K 0.01% 531
2026
Q1 		$49.5K Sell
5,495
-3,412
-38% -$61.4K 0.02% 260
2025
Q4 		$242K Buy
+8,907
New +$222K 0.11% 202

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

Persistent Asset Partners's UPB Position: Q2 2026 in Review

Persistent Asset Partners reduced its Upstream Bio Inc (UPB) stake by 12% in Q2 2026, selling an estimated $5.36K and leaving 4,855 shares worth $33.6K. The position accounts for 0.01% of the portfolio, ranked #531.

Persistent Asset Partners first reported a position in UPB in Q4 2025 and has held it in 3 quarters since. The position peaked at $242K in Q4 2025. 149 funds tracked by Wall St. Rank hold UPB as of Q2 2026.

  • Persistent Asset Partners held 4,855 shares of Upstream Bio Inc worth $33.6K as of Q2 2026.
  • Persistent Asset Partners sold 640 Upstream Bio Inc shares in Q2 2026, an estimated $5.36K.
  • Upstream Bio Inc made up 0.01% of Persistent Asset Partners's portfolio in Q2 2026, its #531 holding.
  • Persistent Asset Partners first reported a position in Upstream Bio Inc in Q4 2025 and has held it in 3 quarters since.
  • Persistent Asset Partners's Upstream Bio Inc position peaked at $242K in Q4 2025.
  • 149 funds tracked by Wall St. Rank held Upstream Bio Inc as of Q2 2026.

Based on Persistent Asset Partners's 13F filing for Q2 2026, filed 7 Aug 2026.