Security record · archived quarter
BLLN
BillionToOne, Inc. · Healthcare · Medical - Diagnostics & Research
38Tracked holders
+14Δ holders
5.00MShares held
$409.17MReported value
+15New positions
−0Exits
Momentum inputs (comparable managers):
holder breadth +30.0% ·
share flow +30.0% ·
net new positions +20.0%
— 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 | 62 | +17 | 8.87M | $1.05B | +21 | −4 |
| Q1 2026 | 45 | +8 | 6.22M | $470.80M | +13 | −6 |
| Q4 2025 | 38 | +14 | 5.00M | $409.17M | +15 | — |
Who holds it · Q4 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Baillie Gifford ✦ | 1.27M | New | $103.79M | 0.1% | New | 1 | SEC ↗ |
| 2 | Baillie Gifford ✦ | 1.27M | New | $103.79M | 0.1% | New | 1 | SEC ↗ |
| 3 | Baillie Gifford ✦ | 1.27M | New | $103.79M | 0.1% | New | 1 | SEC ↗ |
| 4 | Baillie Gifford ✦ | 1.27M | New | $103.79M | 0.1% | New | 1 | SEC ↗ |
| 5 | Baillie Gifford ✦ | 1.27M | New | $103.79M | 0.1% | New | 1 | SEC ↗ |
| 6 | Neuberger Berman Group LLC | 700.87K | — | $57.36M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | Neuberger Berman Group LLC | 700.87K | — | $57.36M | 0.0% | n/c | 1 | SEC ↗ |
| 8 | T. Rowe Price ✦ | 485.28K | New | $39.72M | 0.0% | New | 1 | SEC ↗ |
| 9 | T. Rowe Price ✦ | 485.28K | New | $39.72M | 0.0% | New | 1 | SEC ↗ |
| 10 | JPMorgan Chase ✦ | 391.96K | New | $32.08M | 0.0% | New | 1 | SEC ↗ |
| 11 | JPMorgan Chase ✦ | 391.96K | New | $32.08M | 0.0% | New | 1 | SEC ↗ |
| 12 | JPMorgan Chase ✦ | 391.96K | New | $32.08M | 0.0% | New | 1 | SEC ↗ |
| 13 | The Vanguard Group ✦ (passive) | 352.37K | New | $28.84M | 0.0% | New | 1 | SEC ↗ |
| 14 | The Vanguard Group ✦ (passive) | 352.37K | New | $28.84M | 0.0% | New | 1 | SEC ↗ |
| 15 | The Vanguard Group ✦ (passive) | 352.37K | New | $28.84M | 0.0% | New | 1 | SEC ↗ |
| 16 | UBS AM, a distinct business unit of… | 227.66K | — | $18.63M | 0.0% | n/c | 1 | SEC ↗ |
| 17 | UBS AM, a distinct business unit of… | 227.66K | — | $18.63M | 0.0% | n/c | 1 | SEC ↗ |
| 18 | UBS AM, a distinct business unit of… | 227.66K | — | $18.63M | 0.0% | n/c | 1 | SEC ↗ |
| 19 | Alliancebernstein L.P. | 208.59K | — | $17.07M | 0.0% | n/c | 1 | SEC ↗ |
| 20 | Invesco Ltd. | 189.82K | — | $15.53M | 0.0% | n/c | 1 | SEC ↗ |
| 21 | Capital International Investors | 178.00K | — | $14.57M | 0.0% | n/c | 1 | SEC ↗ |
| 22 | Bamco Inc /Ny/ | 170.00K | — | $13.91M | 0.0% | n/c | 1 | SEC ↗ |
| 23 | Massachusetts Financial Services Co… | 163.40K | — | $13.37M | 0.0% | n/c | 1 | SEC ↗ |
| 24 | Massachusetts Financial Services Co… | 163.40K | — | $13.37M | 0.0% | n/c | 1 | SEC ↗ |
| 25 | Citadel Advisors ✦ | 148.87K | New | $12.18M | 0.0% | New | 1 | SEC ↗ |
| 26 | Citadel Advisors ✦ | 148.87K | New | $12.18M | 0.0% | New | 1 | SEC ↗ |
| 27 | Ameriprise Financial Inc | 122.27K | — | $10.01M | 0.0% | n/c | 1 | SEC ↗ |
| 28 | Ameriprise Financial Inc | 122.27K | — | $10.01M | 0.0% | n/c | 1 | SEC ↗ |
| 29 | Geode Capital Management ✦ (passive) | 82.03K | New | $6.72M | 0.0% | New | 1 | SEC ↗ |
| 30 | Geode Capital Management ✦ (passive) | 82.03K | New | $6.72M | 0.0% | New | 1 | SEC ↗ |
| 31 | BlackRock ✦ (passive) | 71.40K | New | $5.84M | 0.0% | New | 1 | SEC ↗ |
| 32 | BlackRock ✦ (passive) | 71.40K | New | $5.84M | 0.0% | New | 1 | SEC ↗ |
| 33 | BlackRock ✦ (passive) | 71.40K | New | $5.84M | 0.0% | New | 1 | SEC ↗ |
| 34 | BlackRock ✦ (passive) | 71.40K | New | $5.84M | 0.0% | New | 1 | SEC ↗ |
| 35 | BlackRock ✦ (passive) | 71.40K | New | $5.84M | 0.0% | New | 1 | SEC ↗ |
| 36 | BlackRock ✦ (passive) | 71.40K | New | $5.84M | 0.0% | New | 1 | SEC ↗ |
| 37 | BlackRock ✦ (passive) | 71.40K | New | $5.84M | 0.0% | New | 1 | SEC ↗ |
| 38 | UBS Group AG | 31.60K | — | $2.59M | 0.0% | n/c | 1 | SEC ↗ |
| 39 | UBS Group AG | 31.60K | — | $2.59M | 0.0% | n/c | 1 | SEC ↗ |
| 40 | Td Asset Management Inc | 26.73K | — | $2.19M | 0.0% | n/c | 1 | SEC ↗ |
| 41 | Charles Schwab Investment… | 26.60K | — | $2.18M | 0.0% | n/c | 1 | SEC ↗ |
| 42 | State Street Global Advisors ✦ (passive) | 21.60K | New | $1.77M | 0.0% | New | 1 | SEC ↗ |
| 43 | Marshall Wace ✦ | 20.90K | New | $1.71M | 0.0% | New | 1 | SEC ↗ |
| 44 | Marshall Wace ✦ | 20.90K | New | $1.71M | 0.0% | New | 1 | SEC ↗ |
| 45 | Marshall Wace ✦ | 20.90K | New | $1.71M | 0.0% | New | 1 | SEC ↗ |
| 46 | Goldman Sachs Group ✦ | 20.71K | New | $1.70M | 0.0% | New | 1 | SEC ↗ |
| 47 | Universal- Beteiligungs- und… | 16.47K | — | $1.35M | 0.0% | n/c | 1 | SEC ↗ |
| 48 | Soros Fund Management ✦ | 14.50K | New | $1.19M | 0.0% | New | 1 | SEC ↗ |
| 49 | Manufacturers Life Insurance… | 12.12K | — | $1.03M | 0.0% | n/c | 1 | SEC ↗ |
| 50 | Norges Bank ✦ (passive) | 10.00K | New | $818,400 | 0.0% | New | 1 | SEC ↗ |
| 51 | Squarepoint Ops LLC | 7.89K | — | $645,799 | 0.0% | n/c | 1 | SEC ↗ |
| 52 | Alyeska Investment Group, L.P. | 7.00K | — | $572,880 | 0.0% | n/c | 1 | SEC ↗ |
| 53 | Millennium Management ✦ | 5.71K | New | $466,979 | 0.0% | New | 1 | SEC ↗ |
| 54 | Royal Bank Of Canada | 5.57K | — | $456,000 | 0.0% | n/c | 1 | SEC ↗ |
| 55 | New York State Common Retirement… | 5.12K | — | $418,775 | 0.0% | n/c | 1 | SEC ↗ |
| 56 | Morgan Stanley ✦ | 3.60K | New | $294,543 | 0.0% | New | 1 | SEC ↗ |
| 57 | Morgan Stanley ✦ | 3.60K | New | $294,543 | 0.0% | New | 1 | SEC ↗ |
| 58 | Morgan Stanley ✦ | 3.60K | New | $294,543 | 0.0% | New | 1 | SEC ↗ |
| 59 | Wells Fargo & Company/Mn | 933 | — | $76,357 | 0.0% | n/c | 1 | SEC ↗ |
| 60 | Fidelity (FMR) ✦ | 700 | New | $57,288 | 0.0% | New | 1 | SEC ↗ |
| 61 | Osaic Holdings, Inc. | 310 | — | $25,370 | 0.0% | n/c | 1 | SEC ↗ |
| 62 | Legal & General Group Plc | 184 | — | $15,059 | 0.0% | n/c | 1 | SEC ↗ |
| 63 | Bank Of America Corp /De/ | 146 | — | $11,948 | 0.0% | n/c | 1 | SEC ↗ |
| 64 | Bank Of America Corp /De/ | 146 | — | $11,948 | 0.0% | n/c | 1 | SEC ↗ |
| 65 | Jones Financial Companies Lllp | 12 | — | $982 | 0.0% | n/c | 1 | SEC ↗ |
| 66 | Citigroup Inc | 1 | — | $82 | 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
| Baillie Gifford | $103.79M | 0.1% |
| Baillie Gifford | $103.79M | 0.1% |
| Baillie Gifford | $103.79M | 0.1% |
| Baillie Gifford | $103.79M | 0.1% |
| Baillie Gifford | $103.79M | 0.1% |
| T. Rowe Price | $39.72M | 0.0% |
| T. Rowe Price | $39.72M | 0.0% |
| JPMorgan Chase | $32.08M | 0.0% |
| JPMorgan Chase | $32.08M | 0.0% |
| JPMorgan Chase | $32.08M | 0.0% |
| The Vanguard Group | $28.84M | 0.0% |
| The Vanguard Group | $28.84M | 0.0% |
Exited
| No tracked exits this quarter. |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 88 holders, 11.06M shares, $793.58M 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.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Aug 10
Tsao David
Officer, Director · 10.00K sh · $928,600
Aug 10
ten Bosch John Roderick
Officer · 1.42K sh · $131,583
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology
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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