Simplex Trading
MBX

Simplex Trading’s MBX Biosciences MBX Stock Holding History

Simplex Trading’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 		$44.8K Sell
1,500
-43,200
-97% -$1.47M ﹤0.01% 5998
2025
Q4 		$1.41M Sell
44,700
-97,200
-68% -$2.36M ﹤0.01% 2276
2025
Q3 		$2.48M Buy
141,900
+76,600
+117% +$1.02M ﹤0.01% 2110
2025
Q2 		$745K Buy
+65,300
New +$665K ﹤0.01% 3096

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

Simplex Trading's MBX Position: Q1 2026 in Review

Simplex Trading reduced its MBX Biosciences (MBX) stake by 85% in Q1 2026, selling an estimated $259K and leaving 1,307 shares worth $39K. The position accounts for ﹤0.01% of the portfolio, ranked #6127.

Simplex Trading first reported a position in MBX in Q2 2025 and has held it in 3 quarters since. The position peaked at $281K in Q4 2025. 157 funds tracked by Wall St. Rank hold MBX as of Q1 2026.

  • Simplex Trading held 1,307 shares of MBX Biosciences worth $39K as of Q1 2026.
  • Simplex Trading sold 7,618 MBX Biosciences shares in Q1 2026, an estimated $259K.
  • MBX Biosciences made up ﹤0.01% of Simplex Trading's portfolio in Q1 2026, its #6127 holding.
  • Simplex Trading first reported a position in MBX Biosciences in Q2 2025 and has held it in 3 quarters since.
  • Simplex Trading's MBX Biosciences position peaked at $281K in Q4 2025.
  • 157 funds tracked by Wall St. Rank held MBX Biosciences as of Q1 2026.

Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.