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 ↗ ×5 |
| 2 | Wellington Management ✦ | 4.98M | +56.0% | $274.76M | 0.0% | ▲ Add | 8 | SEC ↗ ×7 |
| 3 | BlackRock ✦ (passive) | 3.32M | +13.0% | $183.47M | 0.0% | ▲ Add | 5 | SEC ↗ ×11 |
| 4 | Vanguard Capital Management Llc | 1.48M | 0.0% | $81.55M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 5 | State Street Global Advisors ✦ (passive) | 864.47K | +9.8% | $47.72M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 6 | T. Rowe Price ✦ | 814.81K | -20.8% | $44.98M | 0.0% | ▼ Trim | 8 | SEC ↗ ×2 |
| 7 | Geode Capital Management ✦ (passive) | 773.07K | +15.3% | $42.68M | 0.0% | ▲ Add | 8 | SEC ↗ ×2 |
| 8 | Goldman Sachs Group ✦ | 459.00K | +0.2% | $25.34M | 0.0% | ▲ Add | 4 | SEC ↗ ×2 |
| 9 | Marshall Wace ✦ | 401.88K | +540.9% | $22.18M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 10 | Bank Of America Corp /De/ | 298.93K | +939.8% | $16.50M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 11 | UBS Group AG | 272.75K | -21.4% | $15.06M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 12 | Franklin Resources Inc | 252.66K | New | $13.95M | 0.0% | New | 1 | SEC ↗ ×2 |
| 13 | Morgan Stanley ✦ | 248.56K | +687.5% | $13.72M | 0.0% | ▲ Add | 4 | SEC ↗ ×6 |
| 14 | Northern Trust Corp | 246.68K | +17.1% | $13.62M | 0.0% | ▲ Add | 3 | SEC ↗ ×4 |
| 15 | Dimensional Fund Advisors Lp | 233.70K | +399.9% | $12.90M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 16 | Charles Schwab Investment… | 233.09K | +8.5% | $12.87M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 17 | Millennium Management ✦ | 226.15K | -59.9% | $12.48M | 0.0% | ▼ Trim | 8 | SEC ↗ |
| 18 | D. E. Shaw & Co. ✦ | 182.77K | -36.7% | $10.09M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 19 | JPMorgan Chase ✦ | 139.61K | -5.1% | $7.52M | 0.0% | ▼ Trim | 4 | SEC ↗ ×3 |
| 20 | Two Sigma Investments ✦ | 113.47K | -1.4% | $6.26M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 21 | Nuveen, LLC | 98.73K | +20.7% | $5.45M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 22 | Td Asset Management Inc | 95.60K | -17.6% | $5.28M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 23 | Bank of New York Mellon Corp | 88.93K | +10.8% | $4.91M | 0.0% | ▲ Add | 3 | SEC ↗ ×4 |
| 24 | Prudential Financial Inc | 88.05K | New | $4.86M | 0.0% | New | 1 | SEC ↗ ×2 |
| 25 | Barclays Plc | 87.85K | +642.1% | $4.85M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 26 | Manufacturers Life Insurance… | 66.11K | -27.1% | $3.65M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 27 | Invesco Ltd. | 50.68K | +84.1% | $2.80M | 0.0% | ▲ Add | 3 | SEC ↗ ×5 |
| 28 | Swiss National Bank | 42.90K | -3.4% | $2.37M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 29 | Ensign Peak Advisors, Inc | 42.16K | New | $2.33M | 0.0% | New | 1 | SEC ↗ |
| 30 | Creative Planning | 39.52K | +9.9% | $2.18M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 31 | Rhumbline Advisers | 37.20K | +9.8% | $2.05M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 32 | Deutsche Bank Ag\ | 31.69K | +38.1% | $1.75M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 33 | Wells Fargo & Company/Mn | 28.31K | +163.1% | $1.56M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 34 | Susquehanna International Group, Llp | 26.68K | +181.3% | $1.47M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 35 | Voya Investment Management Llc | 26.13K | New | $1.44M | 0.0% | New | 1 | SEC ↗ ×2 |
| 36 | Universal- Beteiligungs- und… | 25.80K | New | $1.42M | 0.0% | New | 1 | SEC ↗ |
| 37 | Citigroup Inc | 25.12K | +86.1% | $1.39M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 38 | American Century Companies Inc | 22.68K | +159.9% | $1.25M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 39 | AQR Capital Management ✦ | 22.59K | -17.5% | $1.25M | 0.0% | ▼ Trim | 5 | SEC ↗ ×6 |
| 40 | Legal & General Group Plc | 21.58K | +11.5% | $1.19M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 41 | UBS AM, a distinct business unit of… | 21.34K | +194.9% | $1.18M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 42 | Cerity Partners LLC | 21.00K | -0.8% | $1.16M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 43 | Russell Investments Group, Ltd. | 18.16K | +371.0% | $1.00M | 0.0% | ▲ Add | 3 | SEC ↗ ×3 |
| 44 | Alliancebernstein L.P. | 31.00K | +1.6% | $925,350 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 45 | State Of Wisconsin Investment Board | 15.97K | -17.1% | $881,599 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 46 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 14.29K | +7.3% | $788,918 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 47 | New York State Common Retirement… | 11.00K | +22.2% | $607,200 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 48 | Bnp Paribas Financial Markets | 9.86K | -5.0% | $544,272 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 49 | State Board Of Administration Of… | 9.78K | New | $539,690 | 0.0% | New | 1 | SEC ↗ |
| 50 | Quantinno Capital Management LP | 6.50K | New | $358,634 | 0.0% | New | 1 | SEC ↗ |
| 51 | Sei Investments Co | 5.87K | -34.7% | $323,914 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 52 | ProShare Advisors LLC | 5.62K | New | $310,335 | 0.0% | New | 1 | SEC ↗ |
| 53 | Group One Trading Llc | 5.23K | -16.3% | $288,751 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 54 | Canada Pension Plan Investment Board | 5.20K | -52.3% | $287,040 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 55 | Tidal Investments LLC | 5.01K | -43.6% | $276,552 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 56 | Pictet Asset Management Holding SA | 4.10K | New | $226,210 | 0.0% | New | 1 | SEC ↗ |
| 57 | Mirae Asset Global Investments Co.… | 2.13K | -9.1% | $117,521 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 58 | Zurcher Kantonalbank (Zurich… | 2.09K | +343.8% | $115,147 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 59 | Royal Bank Of Canada | 1.46K | +94.9% | $81,000 | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 60 | Simplex Trading, Llc | 1.33K | +1.5% | $73,250 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 61 | Osaic Holdings, Inc. | 282 | +4.8% | $15,566 | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 62 | Rockefeller Capital Management L.P. | 224 | -93.0% | $12,365 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 63 | Pnc Financial Services Group, Inc. | 207 | 0.0% | $11,426 | 0.0% | Held | 3 | SEC ↗ ×3 |
| 64 | FIL Ltd | 178 | 0.0% | $9,826 | 0.0% | Held | 2 | SEC ↗ |
| 65 | Us Bancorp \De\ | 108 | -62.0% | $5,962 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 66 | Jones Financial Companies Lllp | 80 | 0.0% | $4,185 | 0.0% | Held | 3 | SEC ↗ |
| 67 | National Bank Of Canada /Fi/ | 11 | New | $607 | 0.0% | New | 1 | 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% |
| Prudential Financial Inc | $4.86M | 0.0% |
| Ensign Peak Advisors, Inc | $2.33M | 0.0% |
| Voya Investment Management Llc | $1.44M | 0.0% |
| Universal- Beteiligungs- und… | $1.42M | 0.0% |
| State Board Of Administration… | $539,690 | 0.0% |
| Quantinno Capital Management… | $358,634 | 0.0% |
| ProShare Advisors LLC | $310,335 | 0.0% |
| Pictet Asset Management… | $226,210 | 0.0% |
| National Bank Of Canada /Fi/ | $607 | 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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