Ken Griffin
MBX

Ken Griffin’s MBX Biosciences MBX Stock Holding History

Ken Griffin’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 		$755K Buy
25,300
+16,700
+194% +$568K ﹤0.01% 8338
2025
Q4 		$271K Sell
8,600
-105,900
-92% -$2.57M ﹤0.01% 10369
2025
Q3 		$2M Buy
114,500
+93,800
+453% +$1.25M ﹤0.01% 6059
2025
Q2 		$236K Buy
+20,700
New +$211K ﹤0.01% 10341

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 $6.73T AUM 46.02% 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 $328M AUM 166.51% 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

Ken Griffin's MBX Position: Q1 2026 in Review

Ken Griffin increased its MBX Biosciences (MBX) stake by 15% in Q1 2026, buying an estimated $4.18M and bringing the position to 932,833 shares worth $27.8M. The position accounts for ﹤0.01% of the portfolio, ranked #1935.

Ken Griffin first reported a position in MBX in Q3 2024 and has held it in 5 quarters since. 157 funds tracked by Wall St. Rank hold MBX as of Q1 2026.

  • Ken Griffin held 932,833 shares of MBX Biosciences worth $27.8M as of Q1 2026.
  • Ken Griffin bought 122,976 MBX Biosciences shares in Q1 2026, an estimated $4.18M.
  • MBX Biosciences made up ﹤0.01% of Ken Griffin's portfolio in Q1 2026, its #1935 holding.
  • Ken Griffin first reported a position in MBX Biosciences in Q3 2024 and has held it in 5 quarters since.
  • 157 funds tracked by Wall St. Rank held MBX Biosciences as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.