GFM
UPB

GF Fund Management’s Upstream Bio Inc UPB Stock Holding History

GF Fund 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 		$7.92K Sell
1,145
-58
-5% -$486 ﹤0.01% 549
2026
Q1 		$10.8K Buy
1,203
+142
+13% +$2.56K ﹤0.01% 553
2025
Q4 		$28.8K Buy
+1,061
New +$26.4K ﹤0.01% 466

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

GF Fund Management's UPB Position: Q2 2026 in Review

GF Fund Management reduced its Upstream Bio Inc (UPB) stake by 4.8% in Q2 2026, selling an estimated $486 and leaving 1,145 shares worth $7.92K. The position accounts for ﹤0.01% of the portfolio, ranked #549.

GF Fund Management first reported a position in UPB in Q4 2025 and has held it in 3 quarters since. The position peaked at $28.8K in Q4 2025. 149 funds tracked by Wall St. Rank hold UPB as of Q2 2026.

  • GF Fund Management held 1,145 shares of Upstream Bio Inc worth $7.92K as of Q2 2026.
  • GF Fund Management sold 58 Upstream Bio Inc shares in Q2 2026, an estimated $486.
  • Upstream Bio Inc made up ﹤0.01% of GF Fund Management's portfolio in Q2 2026, its #549 holding.
  • GF Fund Management first reported a position in Upstream Bio Inc in Q4 2025 and has held it in 3 quarters since.
  • GF Fund Management's Upstream Bio Inc position peaked at $28.8K in Q4 2025.
  • 149 funds tracked by Wall St. Rank held Upstream Bio Inc as of Q2 2026.

Based on GF Fund Management's 13F filing for Q2 2026, filed 7 Aug 2026.