Security record
MBX
MBX Biosciences, Inc. Common Stock · Healthcare · Biotechnology
67Tracked holders
+5Δ holders
22.03MShares held
$1.22BReported value
+10New positions
−5Exits
Momentum inputs (comparable managers):
holder breadth +8.1% ·
share flow +25.7% ·
net new positions +7.5%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2026
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 67 | +5 | 22.03M | $1.22B | +10 | −5 |
| Q1 2026 | 65 | +3 | 17.55M | $523.43M | +9 | −6 |
| Q4 2025 | 61 | +2 | 15.34M | $483.77M | +2 | — |
| Q3 2025 | 15 | +2 | 13.00M | $227.48M | +2 | — |
| Q2 2025 | 10 | -1 | 8.10M | $92.45M | +1 | −2 |
| Q1 2025 | 8 | 0 | 4.62M | $34.08M | +2 | −2 |
| Q4 2024 | 8 | -2 | 5.08M | $93.07M | — | −2 |
| Q3 2024 | 9 | +9 | 4.81M | $122.94M | +9 | — |
Who holds it · Q2 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Fidelity (FMR) ✦ | 5.32M | +81.2% | $293.82M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 2 | Fidelity (FMR) ✦ | 5.32M | +81.2% | $293.82M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 3 | Fidelity (FMR) ✦ | 5.32M | +81.2% | $293.82M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 4 | Fidelity (FMR) ✦ | 5.32M | +81.2% | $293.82M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 5 | Fidelity (FMR) ✦ | 5.32M | +81.2% | $293.82M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 6 | Wellington Management ✦ | 4.98M | +56.0% | $274.76M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 7 | Wellington Management ✦ | 4.98M | +56.0% | $274.76M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 8 | Wellington Management ✦ | 4.98M | +56.0% | $274.76M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 9 | Wellington Management ✦ | 4.98M | +56.0% | $274.76M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 10 | Wellington Management ✦ | 4.98M | +56.0% | $274.76M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 11 | Wellington Management ✦ | 4.98M | +56.0% | $274.76M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 12 | Wellington Management ✦ | 4.98M | +56.0% | $274.76M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 3.32M | +13.0% | $183.47M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 3.32M | +13.0% | $183.47M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 3.32M | +13.0% | $183.47M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 3.32M | +13.0% | $183.47M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 3.32M | +13.0% | $183.47M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 18 | BlackRock ✦ (passive) | 3.32M | +13.0% | $183.47M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 19 | BlackRock ✦ (passive) | 3.32M | +13.0% | $183.47M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 20 | BlackRock ✦ (passive) | 3.32M | +13.0% | $183.47M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 21 | BlackRock ✦ (passive) | 3.32M | +13.0% | $183.47M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 22 | BlackRock ✦ (passive) | 3.32M | +13.0% | $183.47M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 23 | BlackRock ✦ (passive) | 3.32M | +13.0% | $183.47M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 24 | Vanguard Capital Management Llc | 1.48M | 0.0% | $81.55M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 25 | State Street Global Advisors ✦ (passive) | 864.47K | +9.8% | $47.72M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 26 | T. Rowe Price ✦ | 814.81K | -20.8% | $44.98M | 0.0% | ▼ Trim | 8 | SEC ↗ |
| 27 | T. Rowe Price ✦ | 814.81K | -20.8% | $44.98M | 0.0% | ▼ Trim | 8 | SEC ↗ |
| 28 | Geode Capital Management ✦ (passive) | 773.07K | +15.3% | $42.68M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 29 | Geode Capital Management ✦ (passive) | 773.07K | +15.3% | $42.68M | 0.0% | ▲ Add | 8 | SEC ↗ |
| 30 | Goldman Sachs Group ✦ | 459.00K | +0.2% | $25.34M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 31 | Goldman Sachs Group ✦ | 459.00K | +0.2% | $25.34M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 32 | Marshall Wace ✦ | 401.88K | +540.9% | $22.18M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 33 | Bank Of America Corp /De/ | 298.93K | +939.8% | $16.50M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 34 | Bank Of America Corp /De/ | 298.93K | +939.8% | $16.50M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 35 | UBS Group AG | 272.75K | -21.4% | $15.06M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 36 | UBS Group AG | 272.75K | -21.4% | $15.06M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 37 | Franklin Resources Inc | 252.66K | New | $13.95M | 0.0% | New | 1 | SEC ↗ |
| 38 | Franklin Resources Inc | 252.66K | New | $13.95M | 0.0% | New | 1 | SEC ↗ |
| 39 | Morgan Stanley ✦ | 248.56K | +687.5% | $13.72M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 40 | Morgan Stanley ✦ | 248.56K | +687.5% | $13.72M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 41 | Morgan Stanley ✦ | 248.56K | +687.5% | $13.72M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 42 | Morgan Stanley ✦ | 248.56K | +687.5% | $13.72M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 43 | Morgan Stanley ✦ | 248.56K | +687.5% | $13.72M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 44 | Morgan Stanley ✦ | 248.56K | +687.5% | $13.72M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 45 | Northern Trust Corp | 246.68K | +17.1% | $13.62M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 46 | Northern Trust Corp | 246.68K | +17.1% | $13.62M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 47 | Northern Trust Corp | 246.68K | +17.1% | $13.62M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 48 | Northern Trust Corp | 246.68K | +17.1% | $13.62M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 49 | Dimensional Fund Advisors Lp | 233.70K | +399.9% | $12.90M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 50 | Dimensional Fund Advisors Lp | 233.70K | +399.9% | $12.90M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 51 | Dimensional Fund Advisors Lp | 233.70K | +399.9% | $12.90M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 52 | Charles Schwab Investment… | 233.09K | +8.5% | $12.87M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 53 | Millennium Management ✦ | 226.15K | -59.9% | $12.48M | 0.0% | ▼ Trim | 8 | SEC ↗ |
| 54 | D. E. Shaw & Co. ✦ | 182.77K | -36.7% | $10.09M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 55 | JPMorgan Chase ✦ | 139.61K | -5.1% | $7.52M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 56 | JPMorgan Chase ✦ | 139.61K | -5.1% | $7.52M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 57 | JPMorgan Chase ✦ | 139.61K | -5.1% | $7.52M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 58 | Two Sigma Investments ✦ | 113.47K | -1.4% | $6.26M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 59 | Nuveen, LLC | 98.73K | +20.7% | $5.45M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 60 | Nuveen, LLC | 98.73K | +20.7% | $5.45M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 61 | Nuveen, LLC | 98.73K | +20.7% | $5.45M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 62 | Td Asset Management Inc | 95.60K | -17.6% | $5.28M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 63 | Bank of New York Mellon Corp | 88.93K | +10.8% | $4.91M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 64 | Bank of New York Mellon Corp | 88.93K | +10.8% | $4.91M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 65 | Bank of New York Mellon Corp | 88.93K | +10.8% | $4.91M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 66 | Bank of New York Mellon Corp | 88.93K | +10.8% | $4.91M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 67 | Prudential Financial Inc | 88.05K | New | $4.86M | 0.0% | New | 1 | SEC ↗ |
| 68 | Prudential Financial Inc | 88.05K | New | $4.86M | 0.0% | New | 1 | SEC ↗ |
| 69 | Barclays Plc | 87.85K | +642.1% | $4.85M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 70 | Barclays Plc | 87.85K | +642.1% | $4.85M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 71 | Manufacturers Life Insurance… | 66.11K | -27.1% | $3.65M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 72 | Invesco Ltd. | 50.68K | +84.1% | $2.80M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 73 | Invesco Ltd. | 50.68K | +84.1% | $2.80M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 74 | Invesco Ltd. | 50.68K | +84.1% | $2.80M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 75 | Invesco Ltd. | 50.68K | +84.1% | $2.80M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 76 | Invesco Ltd. | 50.68K | +84.1% | $2.80M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 77 | Swiss National Bank | 42.90K | -3.4% | $2.37M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 78 | Ensign Peak Advisors, Inc | 42.16K | New | $2.33M | 0.0% | New | 1 | SEC ↗ |
| 79 | Creative Planning | 39.52K | +9.9% | $2.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 80 | Creative Planning | 39.52K | +9.9% | $2.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 81 | Rhumbline Advisers | 37.20K | +9.8% | $2.05M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 82 | Deutsche Bank Ag\ | 31.69K | +38.1% | $1.75M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 83 | Deutsche Bank Ag\ | 31.69K | +38.1% | $1.75M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 84 | Wells Fargo & Company/Mn | 28.31K | +163.1% | $1.56M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 85 | Susquehanna International Group, Llp | 26.68K | +181.3% | $1.47M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 86 | Voya Investment Management Llc | 26.13K | New | $1.44M | 0.0% | New | 1 | SEC ↗ |
| 87 | Voya Investment Management Llc | 26.13K | New | $1.44M | 0.0% | New | 1 | SEC ↗ |
| 88 | Universal- Beteiligungs- und… | 25.80K | New | $1.42M | 0.0% | New | 1 | SEC ↗ |
| 89 | Citigroup Inc | 25.12K | +86.1% | $1.39M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 90 | Citigroup Inc | 25.12K | +86.1% | $1.39M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 91 | American Century Companies Inc | 22.68K | +159.9% | $1.25M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 92 | AQR Capital Management ✦ | 22.59K | -17.5% | $1.25M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 93 | AQR Capital Management ✦ | 22.59K | -17.5% | $1.25M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 94 | AQR Capital Management ✦ | 22.59K | -17.5% | $1.25M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 95 | AQR Capital Management ✦ | 22.59K | -17.5% | $1.25M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 96 | AQR Capital Management ✦ | 22.59K | -17.5% | $1.25M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 97 | AQR Capital Management ✦ | 22.59K | -17.5% | $1.25M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 98 | Legal & General Group Plc | 21.58K | +11.5% | $1.19M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 99 | Legal & General Group Plc | 21.58K | +11.5% | $1.19M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 100 | Legal & General Group Plc | 21.58K | +11.5% | $1.19M | 0.0% | ▲ Add | 3 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Franklin Resources Inc | $13.95M | 0.0% |
| Franklin Resources Inc | $13.95M | 0.0% |
| Prudential Financial Inc | $4.86M | 0.0% |
| Prudential Financial Inc | $4.86M | 0.0% |
| Ensign Peak Advisors, Inc | $2.33M | 0.0% |
| Voya Investment Management Llc | $1.44M | 0.0% |
| Voya Investment Management Llc | $1.44M | 0.0% |
| Universal- Beteiligungs- und… | $1.42M | 0.0% |
Exited
| Citadel Advisors | $27.85M | was 0.0% |
| Squarepoint Ops LLC | $2.90M | was 0.0% |
| Victory Capital Management Inc | $2.12M | was 0.0% |
| Schroder Investment… | $1.54M | was 0.0% |
| Qube Research & Technologies… | $513,032 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 156 holders, 52.39M shares, $1.53B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
Frequently co-owned
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q2 2026 ·
Methodology ·
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