BLLN
BillionToOne, Inc. · Healthcare · Medical - Diagnostics & Research
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
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Baillie Gifford ✦ | 1.27M | New | $103.79M | 0.1% | New | 1 | SEC ↗ ×5 |
| 2 | Neuberger Berman Group LLC | 700.87K | n/a | $57.36M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 3 | T. Rowe Price ✦ | 485.28K | New | $39.72M | 0.0% | New | 1 | SEC ↗ ×2 |
| 4 | JPMorgan Chase ✦ | 391.96K | New | $32.08M | 0.0% | New | 1 | SEC ↗ ×3 |
| 5 | The Vanguard Group ✦ (passive) | 352.37K | New | $28.84M | 0.0% | New | 1 | SEC ↗ ×3 |
| 6 | UBS AM, a distinct business unit of… | 227.66K | n/a | $18.63M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 7 | Alliancebernstein L.P. | 208.59K | n/a | $17.07M | 0.0% | n/c | 1 | SEC ↗ |
| 8 | Invesco Ltd. | 189.82K | n/a | $15.53M | 0.0% | n/c | 1 | SEC ↗ |
| 9 | Capital International Investors | 178.00K | n/a | $14.57M | 0.0% | n/c | 1 | SEC ↗ |
| 10 | Bamco Inc /Ny/ | 170.00K | n/a | $13.91M | 0.0% | n/c | 1 | SEC ↗ |
| 11 | Massachusetts Financial Services Co… | 163.40K | n/a | $13.37M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 12 | Citadel Advisors ✦ | 148.87K | New | $12.18M | 0.0% | New | 1 | SEC ↗ ×2 |
| 13 | Ameriprise Financial Inc | 122.27K | n/a | $10.01M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 14 | Geode Capital Management ✦ (passive) | 82.03K | New | $6.72M | 0.0% | New | 1 | SEC ↗ ×2 |
| 15 | BlackRock ✦ (passive) | 71.40K | New | $5.84M | 0.0% | New | 1 | SEC ↗ ×7 |
| 16 | UBS Group AG | 31.60K | n/a | $2.59M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 17 | Td Asset Management Inc | 26.73K | n/a | $2.19M | 0.0% | n/c | 1 | SEC ↗ |
| 18 | Charles Schwab Investment… | 26.60K | n/a | $2.18M | 0.0% | n/c | 1 | SEC ↗ |
| 19 | State Street Global Advisors ✦ (passive) | 21.60K | New | $1.77M | 0.0% | New | 1 | SEC ↗ |
| 20 | Marshall Wace ✦ | 20.90K | New | $1.71M | 0.0% | New | 1 | SEC ↗ ×3 |
| 21 | Goldman Sachs Group ✦ | 20.71K | New | $1.70M | 0.0% | New | 1 | SEC ↗ |
| 22 | Universal- Beteiligungs- und… | 16.47K | n/a | $1.35M | 0.0% | n/c | 1 | SEC ↗ |
| 23 | Soros Fund Management ✦ | 14.50K | New | $1.19M | 0.0% | New | 1 | SEC ↗ |
| 24 | Manufacturers Life Insurance… | 12.12K | n/a | $1.03M | 0.0% | n/c | 1 | SEC ↗ |
| 25 | Norges Bank ✦ (passive) | 10.00K | New | $818,400 | 0.0% | New | 1 | SEC ↗ |
| 26 | Squarepoint Ops LLC | 7.89K | n/a | $645,799 | 0.0% | n/c | 1 | SEC ↗ |
| 27 | Alyeska Investment Group, L.P. | 7.00K | n/a | $572,880 | 0.0% | n/c | 1 | SEC ↗ |
| 28 | Millennium Management ✦ | 5.71K | New | $466,979 | 0.0% | New | 1 | SEC ↗ |
| 29 | Royal Bank Of Canada | 5.57K | n/a | $456,000 | 0.0% | n/c | 1 | SEC ↗ |
| 30 | New York State Common Retirement… | 5.12K | n/a | $418,775 | 0.0% | n/c | 1 | SEC ↗ |
| 31 | Morgan Stanley ✦ | 3.60K | New | $294,543 | 0.0% | New | 1 | SEC ↗ ×3 |
| 32 | Wells Fargo & Company/Mn | 933 | n/a | $76,357 | 0.0% | n/c | 1 | SEC ↗ |
| 33 | Fidelity (FMR) ✦ | 700 | New | $57,288 | 0.0% | New | 1 | SEC ↗ |
| 34 | Osaic Holdings, Inc. | 310 | n/a | $25,370 | 0.0% | n/c | 1 | SEC ↗ |
| 35 | Legal & General Group Plc | 184 | n/a | $15,059 | 0.0% | n/c | 1 | SEC ↗ |
| 36 | Bank Of America Corp /De/ | 146 | n/a | $11,948 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 37 | Jones Financial Companies Lllp | 12 | n/a | $982 | 0.0% | n/c | 1 | SEC ↗ |
| 38 | Citigroup Inc | 1 | n/a | $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% |
| T. Rowe Price | $39.72M | 0.0% |
| JPMorgan Chase | $32.08M | 0.0% |
| The Vanguard Group | $28.84M | 0.0% |
| Citadel Advisors | $12.18M | 0.0% |
| Geode Capital Management | $6.72M | 0.0% |
| BlackRock | $5.84M | 0.0% |
| State Street Global Advisors | $1.77M | 0.0% |
| Marshall Wace | $1.71M | 0.0% |
| Goldman Sachs Group | $1.70M | 0.0% |
| Soros Fund Management | $1.19M | 0.0% |
| Norges Bank | $818,400 | 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.
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)
Officer, Director · 133 sh · $13,669
Officer, Director · 900 sh · $88,590
Officer, Director · 980 sh · $99,751
Officer, Director · 1.28K sh · $128,369
Officer, Director · 1.86K sh · $185,809
Officer, Director · 2.67K sh · $261,366
Officer, Director · 3.08K sh · $303,120
Officer, Director · 100 sh · $9,900
Officer, Director · 3.87K sh · $366,059
Officer, Director · 6.76K sh · $633,335
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology