Security record · archived quarter
MBX
MBX Biosciences, Inc. Common Stock · Healthcare · Biotechnology
8Tracked holders
0Δ holders
4.62MShares held
$34.08MReported value
+2New positions
−2Exits
Momentum inputs (comparable managers): holder breadth 0.0% · share flow -9.2% · net new positions 0.0% · formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 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 | n/a |
| Q3 2025 | 15 | +2 | 13.00M | $227.48M | +2 | n/a |
| 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 | n/a | −2 |
| Q3 2024 | 9 | +9 | 4.81M | $122.94M | +9 | n/a |
Who holds it · Q1 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Wellington Management ✦ | 2.64M | -9.3% | $19.47M | 0.0% | ▼ Trim | 3 | SEC ↗ ×5 |
| 2 | T. Rowe Price ✦ | 1.10M | -5.2% | $8.13M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 3 | Geode Capital Management ✦ (passive) | 274.46K | +3.3% | $2.03M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 4 | State Street Global Advisors ✦ (passive) | 177.22K | +24.2% | $1.31M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 5 | Millennium Management ✦ | 170.44K | -48.9% | $1.26M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 6 | Marshall Wace ✦ | 111.21K | +329.4% | $820,739 | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 7 | Point72 Asset Management ✦ | 110.48K | New | $815,357 | 0.0% | New | 1 | SEC ↗ |
| 8 | Two Sigma Investments ✦ | 33.83K | New | $249,688 | 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
| Point72 Asset Management | $815,357 | 0.0% |
| Two Sigma Investments | $249,688 | 0.0% |
Exited
| Citadel Advisors | $4.06M | was 0.0% |
| Norges Bank | $460,750 | 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 2025 ·
Methodology ·
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