MBX — MBX BIOSCIENCES INC
Reported value held$1.08B
Funds holding (latest)39
SectorHealth Care
Funds holding (Q2 2026)31
Institutional value$993.05M · 18.81M sh
New / Add / Cut / Exit4 / 15 / 9 / 1
Top-5 / Top-10 concentration82.6% / 90.8%
Institutional holdings change
Accumulating +30.9%
(+4.43M sh)
Institutional value change
Up +149.3%
As of Q2 2026, 31 SEC-registered investment managers reported holding MBX (MBX BIOSCIENCES INC) in their latest 13F filings, with a combined reported value of $993.05M across 18.81M shares. That is +30.9% by share count (+4.43M shares) versus the previous quarter, while reported value moved +149.3%. Ownership is concentrated: the five largest holders account for 82.6% of reported value and the top ten for 90.8%.
Compared with the prior quarter, 4 opened new positions, 15 added to existing stakes, 9 trimmed, 1 exited entirely. 13F holdings are quarter-end snapshots, so these moves reflect positioning as of Q2 2026, not real-time trading.
MBX is classified in the Health Care sector.
All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.
Q2 2026 — 31 funds
| Fund | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|
| Fidelity Management & Research (FMR) history | 5.32M | $293.82M | 0.01% | Add |
| Wellington Management Group history | 4.98M | $274.76M | 0.05% | Add |
| BlackRock Inc history | 3.32M | $183.47M | 0.00% | Add |
| Geode Capital Management history | 773.07K | $42.68M | 0.00% | Add |
| Goldman Sachs Group history | 459.00K | $25.34M | 0.00% | Hold |
| Marshall Wace history | 401.88K | $22.18M | 0.02% | Add |
| Bank of America Corp history | 298.93K | $16.50M | 0.00% | Add |
| UBS Group AG history | 272.75K | $15.06M | 0.00% | Reduce |
| Franklin Resources history | 252.66K | $13.95M | 0.00% | New |
| Morgan Stanley history | 248.56K | $13.72M | 0.00% | Add |
| Northern Trust Corp history | 246.68K | $13.62M | 0.00% | Add |
| Charles Schwab Investment Management history | 233.09K | $12.87M | 0.00% | Add |
| Millennium Management history | 226.15K | $12.48M | 0.01% | Reduce |
| D. E. Shaw & Co history | 182.77K | $10.09M | 0.01% | Reduce |
| JPMorgan Chase & Co history | 139.61K | $7.52M | 0.00% | New |
| Two Sigma Investments history | 113.47K | $6.26M | 0.01% | Reduce |
| BNY Mellon history | 88.93K | $4.91M | 0.00% | Add |
| Prudential Financial history | 88.05K | $4.86M | 0.01% | New |
| Manulife Financial history | 66.11K | $3.65M | 0.00% | Reduce |
| Moore Capital Management history | 64.89K | $3.58M | 0.06% | New |
| Invesco Ltd history | 50.68K | $2.80M | 0.00% | Add |
| Deutsche Bank AG history | 31.69K | $1.75M | 0.00% | Add |
| Wells Fargo & Co history | 28.31K | $1.56M | 0.00% | Add |
| Citadel Advisors history | 26.20K | $1.45M | 0.00% | Reduce |
| Citigroup Inc history | 25.12K | $1.39M | 0.00% | Add |
| AQR Capital Management history | 22.59K | $1.25M | 0.00% | Reduce |
| Legal & General Investment Management America history | 21.58K | $1.19M | 0.00% | Add |
| CPP Investments history | 5.20K | $287.04K | 0.00% | Reduce |
| T. Rowe Price Associates history | 814.81K | $44.98K | 0.01% | Reduce |
| PNC Financial Services history | 207 | $11.43K | 0.00% | Hold |
| Fidelity International (FIL) history | 178 | $9.83K | 0.00% | Hold |
Q1 2026 — 28 funds
| Fund | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|
| Wellington Management Group history | 3.19M | $95.28M | 0.02% | Reduce |
| BlackRock Inc history | 2.94M | $87.80M | 0.00% | Add |
| Fidelity Management & Research (FMR) history | 2.94M | $87.66M | 0.01% | Add |
| Citadel Advisors history | 968.03K | $28.90M | 0.01% | Add |
| Geode Capital Management history | 670.38K | $20.02M | 0.00% | Add |
| Millennium Management history | 564.41K | $16.85M | 0.01% | Add |
| Goldman Sachs Group history | 457.94K | $13.67M | 0.00% | Add |
| UBS Group AG history | 346.91K | $10.36M | 0.00% | Add |
| D. E. Shaw & Co history | 288.89K | $8.62M | 0.01% | Reduce |
| Charles Schwab Investment Management history | 214.91K | $6.42M | 0.00% | Reduce |
| Northern Trust Corp history | 210.57K | $6.29M | 0.00% | Add |
| Two Sigma Investments history | 115.08K | $3.43M | 0.00% | Reduce |
| Manulife Financial history | 90.63K | $2.71M | 0.00% | Add |
| BNY Mellon history | 80.22K | $2.39M | 0.00% | Add |
| Marshall Wace history | 62.70K | $1.87M | 0.00% | New |
| Morgan Stanley history | 31.56K | $942.13K | 0.00% | Reduce |
| Bank of America Corp history | 28.75K | $858.19K | 0.00% | Reduce |
| Invesco Ltd history | 27.52K | $821.62K | 0.00% | Add |
| AQR Capital Management history | 27.39K | $817.50K | 0.00% | Reduce |
| Deutsche Bank AG history | 22.95K | $685.06K | 0.00% | Add |
| Legal & General Investment Management America history | 19.36K | $577.84K | 0.00% | Add |
| Citigroup Inc history | 13.50K | $402.94K | 0.00% | Reduce |
| CPP Investments history | 10.90K | $325.37K | 0.00% | Reduce |
| Wells Fargo & Co history | 10.76K | $321.25K | 0.00% | Reduce |
| Janus Henderson Group history | 10.30K | $308.18K | 0.00% | New |
| T. Rowe Price Associates history | 1.03M | $30.72K | 0.00% | Add |
| PNC Financial Services history | 207 | $6.18K | 0.00% | Add |
| Fidelity International (FIL) history | 178 | $5.31K | 0.00% | New |
Q4 2025 — 30 funds
| Fund | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|
| Wellington Management Group history | 3.35M | $105.66M | 0.02% | Reduce |
| BlackRock Inc history | 2.92M | $92.09M | 0.00% | Add |
| Vanguard Group history | 1.82M | $57.33M | 0.00% | Add |
| Citadel Advisors history | 835.36K | $26.35M | 0.00% | Reduce |
| Point72 Asset Management history | 680.61K | $21.47M | 0.03% | Add |
| D. E. Shaw & Co history | 671.84K | $21.19M | 0.01% | New |
| Geode Capital Management history | 649.39K | $20.49M | 0.00% | Add |
| Millennium Management history | 462.05K | $14.57M | 0.01% | Reduce |
| Goldman Sachs Group history | 331.94K | $10.47M | 0.00% | Reduce |
| UBS Group AG history | 281.21K | $8.87M | 0.00% | Add |
| Charles Schwab Investment Management history | 222.18K | $7.01M | 0.00% | Add |
| Northern Trust Corp history | 190.88K | $6.02M | 0.00% | Add |
| Two Sigma Investments history | 138.57K | $4.37M | 0.01% | Add |
| Balyasny Asset Management history | 119.73K | $3.78M | 0.01% | Add |
| BNY Mellon history | 75.26K | $2.37M | 0.00% | Add |
| Manulife Financial history | 69.55K | $2.15M | 0.00% | Add |
| Morgan Stanley history | 59.03K | $1.86M | 0.00% | Add |
| Bank of America Corp history | 37.89K | $1.20M | 0.00% | Add |
| Renaissance Technologies history | 32.64K | $1.03M | 0.00% | New |
| Wells Fargo & Co history | 31.93K | $1.01M | 0.00% | Add |
| AQR Capital Management history | 31.41K | $990.64K | 0.00% | Add |
| Invesco Ltd history | 21.20K | $668.74K | 0.00% | Add |
| Deutsche Bank AG history | 20.03K | $631.65K | 0.00% | Add |
| Citigroup Inc history | 16.39K | $516.97K | 0.00% | Add |
| Fidelity Management & Research (FMR) history | 15.75K | $496.63K | 0.00% | Reduce |
| JPMorgan Chase & Co history | 14.64K | $461.90K | 0.00% | Add |
| CPP Investments history | 11.60K | $365.86K | 0.00% | New |
| Legal & General Investment Management America history | 2.54K | $80.08K | 0.00% | Add |
| T. Rowe Price Associates history | 840.51K | $26.51K | 0.00% | Reduce |
| PNC Financial Services history | 196 | $6.18K | 0.00% | Reduce |
Q3 2025 — 28 funds
| Fund | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|
| Wellington Management Group history | 4.82M | $84.41M | 0.01% | Add |
| BlackRock Inc history | 1.96M | $34.26M | 0.00% | Add |
| Vanguard Group history | 1.68M | $29.35M | 0.00% | Add |
| Franklin Resources history | 1.31M | $22.88M | 0.01% | Add |
| Citadel Advisors history | 1.13M | $19.76M | 0.00% | Add |
| Millennium Management history | 680.42K | $11.91M | 0.01% | Reduce |
| Point72 Asset Management history | 627.67K | $10.98M | 0.02% | Reduce |
| Geode Capital Management history | 473.93K | $8.30M | 0.00% | Add |
| Goldman Sachs Group history | 358.12K | $6.27M | 0.00% | New |
| Charles Schwab Investment Management history | 170.01K | $2.98M | 0.00% | Add |
| Northern Trust Corp history | 133.26K | $2.33M | 0.00% | Add |
| Fidelity Management & Research (FMR) history | 68.98K | $1.21M | 0.00% | Add |
| Manulife Financial history | 68.38K | $1.20M | 0.00% | Reduce |
| UBS Group AG history | 60.73K | $1.06M | 0.00% | Add |
| BNY Mellon history | 47.73K | $835.36K | 0.00% | Add |
| Morgan Stanley history | 44.87K | $785.19K | 0.00% | Add |
| Bank of America Corp history | 26.62K | $465.78K | 0.00% | Reduce |
| Balyasny Asset Management history | 25.64K | $448.72K | 0.00% | New |
| AQR Capital Management history | 15.76K | $275.87K | 0.00% | Reduce |
| Two Sigma Investments history | 13.59K | $237.77K | 0.00% | New |
| Invesco Ltd history | 11.79K | $206.29K | 0.00% | New |
| Wells Fargo & Co history | 11.76K | $205.71K | 0.00% | Add |
| Deutsche Bank AG history | 10.92K | $191.15K | 0.00% | Add |
| JPMorgan Chase & Co history | 6.17K | $108.06K | 0.00% | Reduce |
| Legal & General Investment Management America history | 1.33K | $23.24K | 0.00% | Reduce |
| T. Rowe Price Associates history | 954.73K | $16.71K | 0.00% | Reduce |
| PNC Financial Services history | 252 | $4.41K | 0.00% | New |
| Citigroup Inc history | 178 | $3.12K | 0.00% | Reduce |
Q2 2025 — 23 funds
| Fund | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|
| Wellington Management Group history | 2.27M | $25.86M | 0.01% | Reduce |
| Vanguard Group history | 1.04M | $11.91M | 0.00% | Add |
| BlackRock Inc history | 1.01M | $11.54M | 0.00% | Add |
| Point72 Asset Management history | 973.79K | $11.11M | 0.02% | Add |
| Millennium Management history | 818.14K | $9.33M | 0.01% | Add |
| Franklin Resources history | 494.85K | $5.65M | 0.00% | Add |
| Geode Capital Management history | 348.45K | $3.98M | 0.00% | Add |
| Northern Trust Corp history | 115.59K | $1.32M | 0.00% | Add |
| Charles Schwab Investment Management history | 107.48K | $1.23M | 0.00% | Add |
| Manulife Financial history | 87.10K | $993.78K | 0.00% | Add |
| Fidelity Management & Research (FMR) history | 61.33K | $699.81K | 0.00% | Add |
| Bank of America Corp history | 42.39K | $483.64K | 0.00% | Add |
| BNY Mellon history | 38.03K | $433.94K | 0.00% | Add |
| UBS Group AG history | 30.97K | $353.33K | 0.00% | Add |
| Morgan Stanley history | 24.01K | $273.93K | 0.00% | Reduce |
| Citadel Advisors history | 20.70K | $236.19K | 0.00% | New |
| AQR Capital Management history | 18.00K | $205.39K | 0.00% | New |
| Wells Fargo & Co history | 10.94K | $124.86K | 0.00% | Add |
| Deutsche Bank AG history | 8.76K | $99.97K | 0.00% | Hold |
| JPMorgan Chase & Co history | 8.18K | $93.38K | 0.00% | Reduce |
| Citigroup Inc history | 5.72K | $65.30K | 0.00% | Reduce |
| Legal & General Investment Management America history | 1.55K | $17.70K | 0.00% | Add |
| T. Rowe Price Associates history | 1.35M | $15.37K | 0.00% | Add |
Q1 2025 — 24 funds
| Fund | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|
| Wellington Management Group history | 2.64M | $19.47M | 0.00% | Reduce |
| BlackRock Inc history | 783.04K | $5.78M | 0.00% | Add |
| Vanguard Group history | 665.56K | $4.91M | 0.00% | Reduce |
| Franklin Resources history | 369.31K | $2.73M | 0.00% | Hold |
| Geode Capital Management history | 274.46K | $2.03M | 0.00% | Add |
| JPMorgan Chase & Co history | 201.24K | $1.49M | 0.00% | Add |
| Millennium Management history | 170.44K | $1.26M | 0.00% | Reduce |
| Morgan Stanley history | 114.61K | $845.82K | 0.00% | Add |
| Marshall Wace history | 111.21K | $820.74K | 0.00% | Add |
| Point72 Asset Management history | 110.48K | $815.36K | 0.00% | New |
| Citigroup Inc history | 97.33K | $718.28K | 0.00% | Add |
| Northern Trust Corp history | 96.51K | $712.22K | 0.00% | Add |
| Charles Schwab Investment Management history | 94.55K | $697.75K | 0.00% | Add |
| Manulife Financial history | 50.11K | $369.81K | 0.00% | Add |
| Fidelity Management & Research (FMR) history | 44.24K | $326.49K | 0.00% | Add |
| Two Sigma Investments history | 33.83K | $249.69K | 0.00% | New |
| Bank of America Corp history | 28.09K | $207.30K | 0.00% | Add |
| UBS Group AG history | 27.50K | $202.94K | 0.00% | Reduce |
| BNY Mellon history | 23.91K | $176.46K | 0.00% | Hold |
| Goldman Sachs Group history | 15.17K | $111.94K | 0.00% | Reduce |
| Deutsche Bank AG history | 8.76K | $64.66K | 0.00% | Add |
| Wells Fargo & Co history | 5.98K | $44.11K | 0.00% | Add |
| Legal & General Investment Management America history | 1.11K | $8.17K | 0.00% | Hold |
| T. Rowe Price Associates history | 1.10M | $8.13K | 0.00% | Reduce |
New Positions (Q2 2026)
- Franklin Resources 252.66K sh · $13.95M
- JPMorgan Chase & Co 139.61K sh · $7.52M
- Prudential Financial 88.05K sh · $4.86M
- Moore Capital Management 64.89K sh · $3.58M
Fully Exited (vs previous quarter)
- Janus Henderson Group sold 10.30K sh · $308.18K
Fund Position History — shares by quarter (top 20 funds)
| Fund | Q2 2026 | Q1 2026 | Q4 2025 | Q3 2025 | Q2 2025 | Q1 2025 | Q4 2024 | Q3 2024 |
|---|---|---|---|---|---|---|---|---|
| Fidelity Management & Research (FMR) | 5.32M | 2.94M | 15.75K | 68.98K | 61.33K | 44.24K | 24.57K | — |
| Wellington Management Group | 4.98M | 3.19M | 3.35M | 4.82M | 2.27M | 2.64M | 2.91M | 2.94M |
| BlackRock Inc | 3.32M | 2.94M | 2.92M | 1.96M | 1.01M | 783.04K | 727.95K | — |
| Geode Capital Management | 773.07K | 670.38K | 649.39K | 473.93K | 348.45K | 274.46K | 265.70K | 22.27K |
| Goldman Sachs Group | 459.00K | 457.94K | 331.94K | 358.12K | — | 15.17K | 34.83K | 51.00K |
| Marshall Wace | 401.88K | 62.70K | — | — | — | 111.21K | 25.90K | 12.00K |
| Bank of America Corp | 298.93K | 28.75K | 37.89K | 26.62K | 42.39K | 28.09K | 16.06K | — |
| UBS Group AG | 272.75K | 346.91K | 281.21K | 60.73K | 30.97K | 27.50K | 45.90K | — |
| Franklin Resources | 252.66K | — | — | 1.31M | 494.85K | 369.31K | 369.30K | 450.00K |
| Morgan Stanley | 248.56K | 31.56K | 59.03K | 44.87K | 24.01K | 114.61K | 23.84K | — |
| Northern Trust Corp | 246.68K | 210.57K | 190.88K | 133.26K | 115.59K | 96.51K | 90.68K | — |
| Charles Schwab Investment Management | 233.09K | 214.91K | 222.18K | 170.01K | 107.48K | 94.55K | 93.31K | — |
| Millennium Management | 226.15K | 564.41K | 462.05K | 680.42K | 818.14K | 170.44K | 333.64K | 440.41K |
| D. E. Shaw & Co | 182.77K | 288.89K | 671.84K | — | — | — | — | — |
| JPMorgan Chase & Co | 139.61K | — | 14.64K | 6.17K | 8.18K | 201.24K | 9.11K | — |
| Two Sigma Investments | 113.47K | 115.08K | 138.57K | 13.59K | — | 33.83K | — | — |
| BNY Mellon | 88.93K | 80.22K | 75.26K | 47.73K | 38.03K | 23.91K | 23.91K | — |
| Prudential Financial | 88.05K | — | — | — | — | — | — | — |
| Manulife Financial | 66.11K | 90.63K | 69.55K | 68.38K | 87.10K | 50.11K | 49.67K | 46.19K |
| Moore Capital Management | 64.89K | — | — | — | — | — | — | — |
▲ Bought Low (fund opened/added, stock rose ≥5% next quarter) ▼ Sold High (fund reduced, stock fell ≥5% next quarter)
Drag / scroll to zoom · Default shows the most recent year · Annotations come from quarterly fund actions in 13F filings · Hover a marker for details