American Century Companies
MBX

American Century Companies’s MBX Biosciences MBX Stock Holding History

American Century Companies’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 		$260K Sell
8,726
-3,510
-29% -$119K ﹤0.01% 2660
2025
Q4 		$386K Buy
+12,236
New +$297K ﹤0.01% 2574

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

American Century Companies's MBX Position: Q1 2026 in Review

American Century Companies reduced its MBX Biosciences (MBX) stake by 29% in Q1 2026, selling an estimated $119K and leaving 8,726 shares worth $260K. The position accounts for ﹤0.01% of the portfolio, ranked #2660.

American Century Companies first reported a position in MBX in Q4 2025 and has held it in 2 quarters since. The position peaked at $386K in Q4 2025. 157 funds tracked by Wall St. Rank hold MBX as of Q1 2026.

  • American Century Companies held 8,726 shares of MBX Biosciences worth $260K as of Q1 2026.
  • American Century Companies sold 3,510 MBX Biosciences shares in Q1 2026, an estimated $119K.
  • MBX Biosciences made up ﹤0.01% of American Century Companies's portfolio in Q1 2026, its #2660 holding.
  • American Century Companies first reported a position in MBX Biosciences in Q4 2025 and has held it in 2 quarters since.
  • American Century Companies's MBX Biosciences position peaked at $386K in Q4 2025.
  • 157 funds tracked by Wall St. Rank held MBX Biosciences as of Q1 2026.

Based on American Century Companies's 13F filing for Q1 2026, filed 15 May 2026.