Marshall Wace
MBX

Marshall Wace’s MBX Biosciences MBX Stock Holding History

Marshall Wace’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
Q2 		$22.2M Buy
401,885
+339,182
+541% +$11.8M 0.02% 679
2026
Q1 		$1.87M Buy
+62,703
New +$2.13M ﹤0.01% 1827
2025
Q2 		– Sell
-111,211
Closed -$821K – 3281
2025
Q1 		$821K Buy
111,211
+85,311
+329% +$902K ﹤0.01% 1866
2024
Q4 		$477K Buy
25,900
+13,900
+116% +$296K ﹤0.01% 2047
2024
Q3 		$312K Buy
+12,000
New +$274K ﹤0.01% 2122

Other funds holding MBX

FLSM
Frazier Life Sciences Management Palo Alto, California $4.59B AUM 237.58% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
NMC
NEA Management Company Timonium, Maryland $1.59B AUM 234.06% 1-Year Est. Return
O
OrbiMed New York $5.4B AUM 163.13% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
PBA
Paradigm Biocapital Advisors New York $5.34B AUM 380.18% 1-Year Est. Return
NA
NVP Associates Menlo Park, California $328M AUM 166.51% 1-Year Est. Return
DTC
Deep Track Capital Greenwich, Connecticut $6.87B AUM 205.24% 1-Year Est. Return
PCH
Polar Capital Holdings London, United Kingdom $42.4B AUM 181.11% 1-Year Est. Return

Marshall Wace's MBX Position: Q2 2026 in Review

Marshall Wace increased its MBX Biosciences (MBX) stake by 541% in Q2 2026, buying an estimated $11.8M and bringing the position to 401,885 shares worth $22.2M. The position accounts for 0.02% of the portfolio, ranked #679.

Marshall Wace first reported a position in MBX in Q3 2024 and has held it in 5 quarters since. 173 funds tracked by Wall St. Rank hold MBX as of Q2 2026.

  • Marshall Wace held 401,885 shares of MBX Biosciences worth $22.2M as of Q2 2026.
  • Marshall Wace bought 339,182 MBX Biosciences shares in Q2 2026, an estimated $11.8M.
  • MBX Biosciences made up 0.02% of Marshall Wace's portfolio in Q2 2026, its #679 holding.
  • Marshall Wace first reported a position in MBX Biosciences in Q3 2024 and has held it in 5 quarters since.
  • 173 funds tracked by Wall St. Rank held MBX Biosciences as of Q2 2026.

Based on Marshall Wace's 13F filing for Q2 2026, filed 13 Aug 2026.