Security record · archived quarter
MBX
MBX Biosciences, Inc. Common Stock · Healthcare · Biotechnology
65Tracked holders
+3Δ holders
17.55MShares held
$523.43MReported value
+9New positions
−6Exits
Momentum inputs (comparable managers):
holder breadth +4.8% ·
share flow +16.6% ·
net new positions +4.6%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 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 · Q1 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Wellington Management ✦ | 3.19M | -4.7% | $95.28M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 2 | Wellington Management ✦ | 3.19M | -4.7% | $95.28M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 3 | Wellington Management ✦ | 3.19M | -4.7% | $95.28M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 4 | Wellington Management ✦ | 3.19M | -4.7% | $95.28M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 5 | Wellington Management ✦ | 3.19M | -4.7% | $95.28M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 6 | Wellington Management ✦ | 3.19M | -4.7% | $95.28M | 0.0% | ▼ Trim | 7 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 2.94M | +0.7% | $87.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 2.94M | +0.7% | $87.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 2.94M | +0.7% | $87.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 2.94M | +0.7% | $87.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 2.94M | +0.7% | $87.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 2.94M | +0.7% | $87.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 2.94M | +0.7% | $87.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 2.94M | +0.7% | $87.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 2.94M | +0.7% | $87.80M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 16 | Fidelity (FMR) ✦ | 2.94M | +18550.3% | $87.66M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 17 | Fidelity (FMR) ✦ | 2.94M | +18550.3% | $87.66M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 18 | Fidelity (FMR) ✦ | 2.94M | +18550.3% | $87.66M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 19 | Vanguard Capital Management Llc | 1.48M | — | $44.11M | 0.0% | n/c | 1 | SEC ↗ |
| 20 | T. Rowe Price ✦ | 1.03M | +22.4% | $30.72M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 21 | T. Rowe Price ✦ | 1.03M | +22.4% | $30.72M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 22 | Citadel Advisors ✦ | 932.83K | +15.2% | $27.85M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 23 | Citadel Advisors ✦ | 932.83K | +15.2% | $27.85M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 24 | State Street Global Advisors ✦ (passive) | 787.21K | +17.0% | $23.50M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 25 | Geode Capital Management ✦ (passive) | 670.38K | +3.2% | $20.02M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 26 | Geode Capital Management ✦ (passive) | 670.38K | +3.2% | $20.02M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 27 | Millennium Management ✦ | 564.41K | +22.1% | $16.85M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 28 | Goldman Sachs Group ✦ | 457.94K | +38.0% | $13.67M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 29 | Goldman Sachs Group ✦ | 457.94K | +38.0% | $13.67M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 30 | UBS Group AG | 346.91K | +23.4% | $10.36M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 31 | UBS Group AG | 346.91K | +23.4% | $10.36M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 32 | UBS Group AG | 346.91K | +23.4% | $10.36M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 33 | D. E. Shaw & Co. ✦ | 288.89K | -57.0% | $8.62M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 34 | Charles Schwab Investment… | 214.91K | -3.3% | $6.42M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 35 | Northern Trust Corp | 210.57K | +10.3% | $6.29M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 36 | Northern Trust Corp | 210.57K | +10.3% | $6.29M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 37 | Northern Trust Corp | 210.57K | +10.3% | $6.29M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 38 | Northern Trust Corp | 210.57K | +10.3% | $6.29M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 39 | JPMorgan Chase ✦ | 147.06K | +904.1% | $3.96M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 40 | JPMorgan Chase ✦ | 147.06K | +904.1% | $3.96M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 41 | JPMorgan Chase ✦ | 147.06K | +904.1% | $3.96M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 42 | Td Asset Management Inc | 116.00K | +14.3% | $3.46M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 43 | Two Sigma Investments ✦ | 115.08K | -17.0% | $3.43M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 44 | Squarepoint Ops LLC | 97.22K | +108.2% | $2.90M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 45 | Manufacturers Life Insurance… | 90.63K | +30.3% | $2.71M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 46 | Nuveen, LLC | 81.79K | +8.2% | $2.44M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 47 | Nuveen, LLC | 81.79K | +8.2% | $2.44M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 48 | Nuveen, LLC | 81.79K | +8.2% | $2.44M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 49 | Bank of New York Mellon Corp | 80.22K | +6.6% | $2.39M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 50 | Bank of New York Mellon Corp | 80.22K | +6.6% | $2.39M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 51 | Bank of New York Mellon Corp | 80.22K | +6.6% | $2.39M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 52 | Victory Capital Management Inc | 71.03K | New | $2.12M | 0.0% | New | 1 | SEC ↗ |
| 53 | Marshall Wace ✦ | 62.70K | New | $1.87M | 0.0% | New | 1 | SEC ↗ |
| 54 | Marshall Wace ✦ | 62.70K | New | $1.87M | 0.0% | New | 1 | SEC ↗ |
| 55 | Schroder Investment Management Group | 57.32K | — | $1.54M | 0.0% | n/c | 1 | SEC ↗ |
| 56 | Dimensional Fund Advisors Lp | 46.75K | New | $1.40M | 0.0% | New | 1 | SEC ↗ |
| 57 | Dimensional Fund Advisors Lp | 46.75K | New | $1.40M | 0.0% | New | 1 | SEC ↗ |
| 58 | Swiss National Bank | 44.40K | New | $1.33M | 0.0% | New | 1 | SEC ↗ |
| 59 | Creative Planning | 35.97K | +6.9% | $1.07M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 60 | Rhumbline Advisers | 33.87K | +1.4% | $1.01M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 61 | Alliancebernstein L.P. | 30.50K | +9.3% | $961,970 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 62 | Morgan Stanley ✦ | 31.56K | -46.5% | $942,126 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 63 | Morgan Stanley ✦ | 31.56K | -46.5% | $942,126 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 64 | Morgan Stanley ✦ | 31.56K | -46.5% | $942,126 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 65 | Morgan Stanley ✦ | 31.56K | -46.5% | $942,126 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 66 | Bank Of America Corp /De/ | 28.75K | -24.1% | $858,188 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 67 | Invesco Ltd. | 27.52K | +29.8% | $821,621 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 68 | Invesco Ltd. | 27.52K | +29.8% | $821,621 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 69 | Invesco Ltd. | 27.52K | +29.8% | $821,621 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 70 | Invesco Ltd. | 27.52K | +29.8% | $821,621 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 71 | AQR Capital Management ✦ | 27.39K | -12.8% | $817,501 | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 72 | AQR Capital Management ✦ | 27.39K | -12.8% | $817,501 | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 73 | AQR Capital Management ✦ | 27.39K | -12.8% | $817,501 | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 74 | AQR Capital Management ✦ | 27.39K | -12.8% | $817,501 | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 75 | AQR Capital Management ✦ | 27.39K | -12.8% | $817,501 | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 76 | AQR Capital Management ✦ | 27.39K | -12.8% | $817,501 | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 77 | Deutsche Bank Ag\ | 22.95K | +14.6% | $685,058 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 78 | California State Teachers… | 22.77K | +1197.9% | $679,535 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 79 | Cerity Partners LLC | 21.16K | -0.8% | $631,715 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 80 | Cerity Partners LLC | 21.16K | -0.8% | $631,715 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 81 | Legal & General Group Plc | 19.36K | +662.4% | $577,837 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 82 | Legal & General Group Plc | 19.36K | +662.4% | $577,837 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 83 | Legal & General Group Plc | 19.36K | +662.4% | $577,837 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 84 | State Of Wisconsin Investment Board | 19.26K | New | $574,971 | 0.0% | New | 1 | SEC ↗ |
| 85 | Qube Research & Technologies Ltd | 17.19K | -26.0% | $513,032 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 86 | Citigroup Inc | 13.50K | -17.6% | $402,945 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 87 | Citigroup Inc | 13.50K | -17.6% | $402,945 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 88 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 13.32K | +0.5% | $397,751 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 89 | Barclays Plc | 11.84K | -77.5% | $353,365 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 90 | Barclays Plc | 11.84K | -77.5% | $353,365 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 91 | Canada Pension Plan Investment Board | 10.90K | -6.0% | $325,365 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 92 | Wells Fargo & Company/Mn | 10.76K | -66.3% | $321,246 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 93 | Bnp Paribas Financial Markets | 10.38K | +53.1% | $309,962 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 94 | Janus Henderson Group Plc | 10.30K | New | $308,176 | 0.0% | New | 1 | SEC ↗ |
| 95 | Susquehanna International Group, Llp | 9.49K | -87.6% | $283,187 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 96 | New York State Common Retirement… | 9.00K | +109.3% | $268,650 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 97 | Sei Investments Co | 8.99K | +17.4% | $268,322 | 0.0% | ▲ Add | 2 | SEC ↗ |
| 98 | Tidal Investments LLC | 8.88K | New | $264,978 | 0.0% | New | 1 | SEC ↗ |
| 99 | American Century Companies Inc | 8.73K | -28.7% | $260,471 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 100 | UBS AM, a distinct business unit of… | 7.24K | +7138.0% | $216,054 | 0.0% | ▲ Add | 2 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Victory Capital Management Inc | $2.12M | 0.0% |
| Marshall Wace | $1.87M | 0.0% |
| Marshall Wace | $1.87M | 0.0% |
| Dimensional Fund Advisors Lp | $1.40M | 0.0% |
| Dimensional Fund Advisors Lp | $1.40M | 0.0% |
| Swiss National Bank | $1.33M | 0.0% |
| State Of Wisconsin Investment… | $574,971 | 0.0% |
| Janus Henderson Group Plc | $308,176 | 0.0% |
| Tidal Investments LLC | $264,978 | 0.0% |
Exited
| Point72 Asset Management | $21.47M | was 0.0% |
| Balyasny Asset Management L.P. | $3.78M | was 0.0% |
| Jane Street Group, Llc | $2.73M | was 0.0% |
| Renaissance Technologies | $1.03M | was 0.0% |
| ProShare Advisors LLC | $226,679 | was 0.0% |
| Daiwa Securities Group Inc. | $5,000 | 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: Q1 2026 ·
Methodology ·
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