SEI Investments
MBX

SEI Investments’s MBX Biosciences MBX Stock Holding History

SEI Investments’s Portfolio MBX Stock Details MBX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$268K Buy
8,989
+1,332
+17% +$45.3K ﹤0.01% 2862
2025
Q4 		$242K Buy
+7,657
New +$186K ﹤0.01% 2824

Other funds holding MBX

FLSM
Frazier Life Sciences Management Palo Alto, California $3.89B AUM 201.1% 1-Year Est. Return
O
OrbiMed New York $5.05B AUM 125.28% 1-Year Est. Return
NMC
NEA Management Company Timonium, Maryland $1.76B AUM 223.33% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
DTC
Deep Track Capital Greenwich, Connecticut $6.12B AUM 144% 1-Year Est. Return
NA
NVP Associates Menlo Park, California $176M AUM 208.78% 1-Year Est. Return
PCH
Polar Capital Holdings London, United Kingdom $28.2B AUM 115.26% 1-Year Est. Return
B
Braidwell Stamford, Connecticut $3B AUM 46.72% 1-Year Est. Return

SEI Investments's MBX Position: Q1 2026 in Review

SEI Investments increased its MBX Biosciences (MBX) stake by 17% in Q1 2026, buying an estimated $45.3K and bringing the position to 8,989 shares worth $268K. The position accounts for ﹤0.01% of the portfolio, ranked #2862.

SEI Investments first reported a position in MBX in Q4 2025 and has held it in 2 quarters since. 157 funds tracked by Wall St. Rank hold MBX as of Q1 2026.

  • SEI Investments held 8,989 shares of MBX Biosciences worth $268K as of Q1 2026.
  • SEI Investments bought 1,332 MBX Biosciences shares in Q1 2026, an estimated $45.3K.
  • MBX Biosciences made up ﹤0.01% of SEI Investments's portfolio in Q1 2026, its #2862 holding.
  • SEI Investments first reported a position in MBX Biosciences in Q4 2025 and has held it in 2 quarters since.
  • 157 funds tracked by Wall St. Rank held MBX Biosciences as of Q1 2026.

Based on SEI Investments's 13F filing for Q1 2026, filed 13 May 2026.