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
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 $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

Persistent Asset Partners's UPB Position: Q1 2026 in Review

Persistent Asset Partners reduced its Upstream Bio Inc (UPB) stake by 38% in Q1 2026, selling an estimated $61.4K and leaving 5,495 shares worth $49.5K. The position accounts for 0.02% of the portfolio, ranked #260.

Persistent Asset Partners first reported a position in UPB in Q4 2025 and has held it in 2 quarters since. The position peaked at $242K in Q4 2025. 140 funds tracked by Wall St. Rank hold UPB as of Q1 2026.

  • Persistent Asset Partners held 5,495 shares of Upstream Bio Inc worth $49.5K as of Q1 2026.
  • Persistent Asset Partners sold 3,412 Upstream Bio Inc shares in Q1 2026, an estimated $61.4K.
  • Upstream Bio Inc made up 0.02% of Persistent Asset Partners's portfolio in Q1 2026, its #260 holding.
  • Persistent Asset Partners first reported a position in Upstream Bio Inc in Q4 2025 and has held it in 2 quarters since.
  • Persistent Asset Partners's Upstream Bio Inc position peaked at $242K in Q4 2025.
  • 140 funds tracked by Wall St. Rank held Upstream Bio Inc as of Q1 2026.

Based on Persistent Asset Partners's 13F filing for Q1 2026, filed 12 May 2026.