Security record · archived quarter
MBX
MBX Biosciences, Inc. Common Stock · Healthcare · Biotechnology
61Tracked holders
+2Δ holders
15.34MShares held
$483.77MReported value
+2New positions
−0Exits
Momentum inputs (comparable managers):
holder breadth +3.4% ·
share flow +3.4% ·
net new positions +3.3%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2025
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 · Q4 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Wellington Management ✦ | 3.35M | -30.6% | $105.66M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 2 | Wellington Management ✦ | 3.35M | -30.6% | $105.66M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 3 | Wellington Management ✦ | 3.35M | -30.6% | $105.66M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 4 | Wellington Management ✦ | 3.35M | -30.6% | $105.66M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 5 | Wellington Management ✦ | 3.35M | -30.6% | $105.66M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 2.92M | +49.2% | $92.09M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 2.92M | +49.2% | $92.09M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 2.92M | +49.2% | $92.09M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 2.92M | +49.2% | $92.09M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 2.92M | +49.2% | $92.09M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 2.92M | +49.2% | $92.09M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 2.92M | +49.2% | $92.09M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 2.92M | +49.2% | $92.09M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 2.92M | +49.2% | $92.09M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 2.92M | +49.2% | $92.09M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 2.92M | +49.2% | $92.09M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 17 | The Vanguard Group ✦ (passive) | 1.82M | +8.4% | $57.33M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 18 | The Vanguard Group ✦ (passive) | 1.82M | +8.4% | $57.33M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 19 | The Vanguard Group ✦ (passive) | 1.82M | +8.4% | $57.33M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 20 | T. Rowe Price ✦ | 840.51K | -12.0% | $26.51M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 21 | T. Rowe Price ✦ | 840.51K | -12.0% | $26.51M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 22 | Citadel Advisors ✦ | 809.86K | -18.7% | $25.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 23 | Point72 Asset Management ✦ | 680.61K | +8.4% | $21.47M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 24 | State Street Global Advisors ✦ (passive) | 672.74K | +110.7% | $21.22M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 25 | D. E. Shaw & Co. ✦ | 671.84K | New | $21.19M | 0.0% | New | 1 | SEC ↗ |
| 26 | Geode Capital Management ✦ (passive) | 649.39K | +37.0% | $20.49M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 27 | Geode Capital Management ✦ (passive) | 649.39K | +37.0% | $20.49M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 28 | Millennium Management ✦ | 462.05K | -29.5% | $14.57M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 29 | Goldman Sachs Group ✦ | 331.94K | -7.3% | $10.47M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 30 | Goldman Sachs Group ✦ | 331.94K | -7.3% | $10.47M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 31 | UBS Group AG | 281.21K | — | $8.87M | 0.0% | n/c | 1 | SEC ↗ |
| 32 | UBS Group AG | 281.21K | — | $8.87M | 0.0% | n/c | 1 | SEC ↗ |
| 33 | Charles Schwab Investment… | 222.18K | — | $7.01M | 0.0% | n/c | 1 | SEC ↗ |
| 34 | Northern Trust Corp | 190.88K | — | $6.02M | 0.0% | n/c | 1 | SEC ↗ |
| 35 | Northern Trust Corp | 190.88K | — | $6.02M | 0.0% | n/c | 1 | SEC ↗ |
| 36 | Northern Trust Corp | 190.88K | — | $6.02M | 0.0% | n/c | 1 | SEC ↗ |
| 37 | Two Sigma Investments ✦ | 138.57K | +919.9% | $4.37M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 38 | Balyasny Asset Management L.P. | 119.73K | — | $3.78M | 0.0% | n/c | 1 | SEC ↗ |
| 39 | Td Asset Management Inc | 101.45K | — | $3.20M | 0.0% | n/c | 1 | SEC ↗ |
| 40 | Jane Street Group, Llc | 86.58K | — | $2.73M | 0.0% | n/c | 1 | SEC ↗ |
| 41 | Osaic Holdings, Inc. | 77.60K | — | $2.45M | 0.0% | n/c | 1 | SEC ↗ |
| 42 | Susquehanna International Group, Llp | 76.53K | — | $2.41M | 0.0% | n/c | 1 | SEC ↗ |
| 43 | Nuveen, LLC | 75.56K | — | $2.38M | 0.0% | n/c | 1 | SEC ↗ |
| 44 | Nuveen, LLC | 75.56K | — | $2.38M | 0.0% | n/c | 1 | SEC ↗ |
| 45 | Bank of New York Mellon Corp | 75.26K | — | $2.37M | 0.0% | n/c | 1 | SEC ↗ |
| 46 | Bank of New York Mellon Corp | 75.26K | — | $2.37M | 0.0% | n/c | 1 | SEC ↗ |
| 47 | Bank of New York Mellon Corp | 75.26K | — | $2.37M | 0.0% | n/c | 1 | SEC ↗ |
| 48 | Manufacturers Life Insurance… | 69.55K | — | $2.15M | 0.0% | n/c | 1 | SEC ↗ |
| 49 | Morgan Stanley ✦ | 59.03K | +31.6% | $1.86M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 50 | Morgan Stanley ✦ | 59.03K | +31.6% | $1.86M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 51 | Morgan Stanley ✦ | 59.03K | +31.6% | $1.86M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 52 | Morgan Stanley ✦ | 59.03K | +31.6% | $1.86M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 53 | Barclays Plc | 52.69K | — | $1.66M | 0.0% | n/c | 1 | SEC ↗ |
| 54 | Squarepoint Ops LLC | 46.70K | — | $1.47M | 0.0% | n/c | 1 | SEC ↗ |
| 55 | Bank Of America Corp /De/ | 37.89K | — | $1.20M | 0.0% | n/c | 1 | SEC ↗ |
| 56 | Bank Of America Corp /De/ | 37.89K | — | $1.20M | 0.0% | n/c | 1 | SEC ↗ |
| 57 | Bank Of America Corp /De/ | 37.89K | — | $1.20M | 0.0% | n/c | 1 | SEC ↗ |
| 58 | Creative Planning | 33.65K | — | $1.06M | 0.0% | n/c | 1 | SEC ↗ |
| 59 | Rhumbline Advisers | 33.42K | — | $1.05M | 0.0% | n/c | 1 | SEC ↗ |
| 60 | Renaissance Technologies ✦ | 32.64K | New | $1.03M | 0.0% | New | 1 | SEC ↗ |
| 61 | Wells Fargo & Company/Mn | 31.93K | — | $1.01M | 0.0% | n/c | 1 | SEC ↗ |
| 62 | AQR Capital Management ✦ | 31.41K | +99.2% | $990,641 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 63 | AQR Capital Management ✦ | 31.41K | +99.2% | $990,641 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 64 | AQR Capital Management ✦ | 31.41K | +99.2% | $990,641 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 65 | AQR Capital Management ✦ | 31.41K | +99.2% | $990,641 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 66 | AQR Capital Management ✦ | 31.41K | +99.2% | $990,641 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 67 | AQR Capital Management ✦ | 31.41K | +99.2% | $990,641 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 68 | Alliancebernstein L.P. | 27.90K | — | $879,966 | 0.0% | n/c | 1 | SEC ↗ |
| 69 | Qube Research & Technologies Ltd | 23.21K | — | $732,138 | 0.0% | n/c | 1 | SEC ↗ |
| 70 | Cerity Partners LLC | 21.32K | — | $672,527 | 0.0% | n/c | 1 | SEC ↗ |
| 71 | Cerity Partners LLC | 21.32K | — | $672,527 | 0.0% | n/c | 1 | SEC ↗ |
| 72 | Cerity Partners LLC | 21.32K | — | $672,527 | 0.0% | n/c | 1 | SEC ↗ |
| 73 | Invesco Ltd. | 21.20K | — | $668,743 | 0.0% | n/c | 1 | SEC ↗ |
| 74 | Invesco Ltd. | 21.20K | — | $668,743 | 0.0% | n/c | 1 | SEC ↗ |
| 75 | Invesco Ltd. | 21.20K | — | $668,743 | 0.0% | n/c | 1 | SEC ↗ |
| 76 | Deutsche Bank Ag\ | 20.03K | — | $631,652 | 0.0% | n/c | 1 | SEC ↗ |
| 77 | Citigroup Inc | 16.39K | — | $516,972 | 0.0% | n/c | 1 | SEC ↗ |
| 78 | Citigroup Inc | 16.39K | — | $516,972 | 0.0% | n/c | 1 | SEC ↗ |
| 79 | Fidelity (FMR) ✦ | 15.75K | -77.2% | $496,629 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 80 | JPMorgan Chase ✦ | 14.64K | +18.6% | $461,904 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 81 | JPMorgan Chase ✦ | 14.64K | +18.6% | $461,904 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 82 | JPMorgan Chase ✦ | 14.64K | +18.6% | $461,904 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 83 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 13.26K | — | $418,157 | 0.0% | n/c | 1 | SEC ↗ |
| 84 | American Century Companies Inc | 12.24K | — | $385,923 | 0.0% | n/c | 1 | SEC ↗ |
| 85 | Canada Pension Plan Investment Board | 11.60K | — | $365,864 | 0.0% | n/c | 1 | SEC ↗ |
| 86 | Group One Trading Llc | 9.43K | — | $297,359 | 0.0% | n/c | 1 | SEC ↗ |
| 87 | Simplex Trading, Llc | 8.93K | — | $281,494 | 0.0% | n/c | 1 | SEC ↗ |
| 88 | Sei Investments Co | 7.66K | — | $241,502 | 0.0% | n/c | 1 | SEC ↗ |
| 89 | ProShare Advisors LLC | 7.19K | — | $226,679 | 0.0% | n/c | 1 | SEC ↗ |
| 90 | Bnp Paribas Financial Markets | 6.78K | — | $213,967 | 0.0% | n/c | 1 | SEC ↗ |
| 91 | New York State Common Retirement… | 4.30K | — | $135,622 | 0.0% | n/c | 1 | SEC ↗ |
| 92 | Rockefeller Capital Management L.P. | 3.00K | — | $94,620 | 0.0% | n/c | 1 | SEC ↗ |
| 93 | Russell Investments Group, Ltd. | 2.86K | — | $90,078 | 0.0% | n/c | 1 | SEC ↗ |
| 94 | Russell Investments Group, Ltd. | 2.86K | — | $90,078 | 0.0% | n/c | 1 | SEC ↗ |
| 95 | Legal & General Group Plc | 2.54K | — | $80,080 | 0.0% | n/c | 1 | SEC ↗ |
| 96 | Mirae Asset Global Investments Co.… | 2.18K | — | $68,820 | 0.0% | n/c | 1 | SEC ↗ |
| 97 | Cwm, Llc | 1.78K | — | $56,000 | 0.0% | n/c | 1 | SEC ↗ |
| 98 | California State Teachers… | 1.75K | — | $55,321 | 0.0% | n/c | 1 | SEC ↗ |
| 99 | Royal Bank Of Canada | 1.53K | — | $49,000 | 0.0% | n/c | 1 | SEC ↗ |
| 100 | Royal Bank Of Canada | 1.53K | — | $49,000 | 0.0% | n/c | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| D. E. Shaw & Co. | $21.19M | 0.0% |
| Renaissance Technologies | $1.03M | 0.0% |
Exited
| No tracked exits this quarter. |
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: Q4 2025 ·
Methodology ·
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