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
Q2 		$275M Buy
4,977,523
+1,785,699
+56% +$62.4M 0.05% 324
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 $4.59B AUM 237.58% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 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
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Wellington Management Group's MBX Position: Q2 2026 in Review

Wellington Management Group increased its MBX Biosciences (MBX) stake by 56% in Q2 2026, buying an estimated $62.4M and bringing the position to 4,977,523 shares worth $275M. The position accounts for 0.05% of the portfolio, ranked #324.

Wellington Management Group first reported a position in MBX in Q3 2024 and has held it in 8 quarters since. 172 funds tracked by Wall St. Rank hold MBX as of Q2 2026.

  • Wellington Management Group held 4,977,523 shares of MBX Biosciences worth $275M as of Q2 2026.
  • Wellington Management Group bought 1,785,699 MBX Biosciences shares in Q2 2026, an estimated $62.4M.
  • MBX Biosciences made up 0.05% of Wellington Management Group's portfolio in Q2 2026, its #324 holding.
  • Wellington Management Group first reported a position in MBX Biosciences in Q3 2024 and has held it in 8 quarters since.
  • 172 funds tracked by Wall St. Rank held MBX Biosciences as of Q2 2026.

Based on Wellington Management Group's 13F filing for Q2 2026, filed 14 Aug 2026.