Wellington Management Group
MBX

Wellington Management Group’s MBX Biosciences MBX Stock Holding History

Wellington Management Group’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 		$95.3M Sell
3,191,824
-158,137
-5% -$5.38M 0.02% 560
2025
Q4 		$106M Sell
3,349,961
-1,473,375
-31% -$35.8M 0.02% 535
2025
Q3 		$84.4M Buy
4,823,336
+2,556,708
+113% +$34.2M 0.01% 595
2025
Q2 		$25.9M Sell
2,266,628
-371,893
-14% -$3.79M ﹤0.01% 877
2025
Q1 		$19.5M Sell
2,638,521
-271,118
-9% -$2.87M ﹤0.01% 958
2024
Q4 		$53M Sell
2,909,639
-28,214
-1% -$601K 0.01% 690
2024
Q3 		$74.3M Buy
+2,937,853
New +$67.2M 0.01% 607

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
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
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Wellington Management Group's MBX Position: Q1 2026 in Review

Wellington Management Group reduced its MBX Biosciences (MBX) stake by 4.7% in Q1 2026, selling an estimated $5.38M and leaving 3,191,824 shares worth $95.3M. The position accounts for 0.02% of the portfolio, ranked #560.

Wellington Management Group first reported a position in MBX in Q3 2024 and has held it in 7 quarters since. The position peaked at $106M in Q4 2025. 157 funds tracked by Wall St. Rank hold MBX as of Q1 2026.

  • Wellington Management Group held 3,191,824 shares of MBX Biosciences worth $95.3M as of Q1 2026.
  • Wellington Management Group sold 158,137 MBX Biosciences shares in Q1 2026, an estimated $5.38M.
  • MBX Biosciences made up 0.02% of Wellington Management Group's portfolio in Q1 2026, its #560 holding.
  • Wellington Management Group first reported a position in MBX Biosciences in Q3 2024 and has held it in 7 quarters since.
  • Wellington Management Group's MBX Biosciences position peaked at $106M in Q4 2025.
  • 157 funds tracked by Wall St. Rank held MBX Biosciences as of Q1 2026.

Based on Wellington Management Group's 13F filing for Q1 2026, filed 15 May 2026.