AQR Capital Management
UPB

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

AQR 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
Q1 		$650K Buy
72,171
+41,668
+137% +$750K ﹤0.01% 2996
2025
Q4 		$828K Buy
30,503
+549
+2% +$13.7K ﹤0.01% 2654
2025
Q3 		$563K Buy
29,954
+202
+0.7% +$3.14K ﹤0.01% 2759
2025
Q2 		$327K Buy
29,752
+10,930
+58% +$101K ﹤0.01% 2829
2025
Q1 		$115K Buy
+18,822
New +$180K ﹤0.01% 2990

Other funds holding UPB

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
O
OrbiMed New York $5.05B AUM 125.28% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
DC
Decheng Capital Menlo Park, California $661M AUM 299.97% 1-Year Est. Return
ES
Enavate Sciences Menlo Park, California $352M AUM 220.14% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
YIH
Y-Intercept (HK) Hong Kong $5.05B AUM 17.89% 1-Year Est. Return
Federated Hermes
Federated Hermes Pittsburgh, Pennsylvania $61.5B AUM 30.7% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

AQR Capital Management's UPB Position: Q1 2026 in Review

AQR Capital Management increased its Upstream Bio Inc (UPB) stake by 137% in Q1 2026, buying an estimated $750K and bringing the position to 72,171 shares worth $650K. The position accounts for ﹤0.01% of the portfolio, ranked #2996.

AQR Capital Management first reported a position in UPB in Q1 2025 and has held it in 5 quarters since. The position peaked at $828K in Q4 2025. 140 funds tracked by Wall St. Rank hold UPB as of Q1 2026.

  • AQR Capital Management held 72,171 shares of Upstream Bio Inc worth $650K as of Q1 2026.
  • AQR Capital Management bought 41,668 Upstream Bio Inc shares in Q1 2026, an estimated $750K.
  • Upstream Bio Inc made up ﹤0.01% of AQR Capital Management's portfolio in Q1 2026, its #2996 holding.
  • AQR Capital Management first reported a position in Upstream Bio Inc in Q1 2025 and has held it in 5 quarters since.
  • AQR Capital Management's Upstream Bio Inc position peaked at $828K in Q4 2025.
  • 140 funds tracked by Wall St. Rank held Upstream Bio Inc as of Q1 2026.

Based on AQR Capital Management's 13F filing for Q1 2026, filed 15 May 2026.