BillionToOne Inc
BLLN
91 hedge funds and large institutions have $875M invested in BillionToOne Inc in 2026 Q1 according to their latest regulatory filings, with 29 funds opening new positions, 32 increasing their positions, 15 reducing their positions, and 28 closing their positions.
113% more repeat investments, than reductions
Existing positions increased: 32 | Existing positions reduced: 15
25% more funds holding in top 10
Funds holding in top 10: 4 → 5 (+1)
11% more capital invested
Capital invested by funds: $790M → $875M (+$85.4M)
3.97% more ownership
Funds ownership: 23.46% → 27.43% (+4%)
4% more first-time investments, than exits
New positions opened: 29 | Existing positions closed: 28
0% more funds holding
Funds holding: 91 → 91 (0)
56% less call options, than puts
Call options by funds: $1.66M | Put options by funds: $3.77M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BAMCO Inc
New York
|
+$46.8M |
| 2 |
WA
Wasatch Advisors
Salt Lake City,
Utah
|
+$30.3M |
| 3 |
T. Rowe Price Associates
Baltimore,
Maryland
|
+$20.6M |
| 4 |
Invesco
Atlanta,
Georgia
|
+$17.7M |
| 5 |
PCM
Penn Capital Management
Philadelphia,
Pennsylvania
|
+$10.3M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Citadel Advisors
Miami,
Florida
|
-$12.2M |
| 2 |
JP Morgan Chase
New York
|
-$8.91M |
| 3 |
T. Rowe Price Investment Management
Baltimore,
Maryland
|
-$8.28M |
| 4 |
SL
Siren LLC
Greenwich,
Connecticut
|
-$6.86M |
| 5 |
B
Braidwell
Stamford,
Connecticut
|
-$4.09M |
BLLN Hedge Fund Activity: Q1 2026 in Review
91 of the 8,187 institutional investors tracked by Wall St. Rank reported a position in BillionToOne Inc (BLLN) for Q1 2026, worth a combined $875M — up 11% from $790M a quarter earlier.
Buyers outnumbered sellers: 29 funds opened new BLLN positions and 28 closed out — a net gain of 1 holder — while 32 added to existing stakes and 15 trimmed.
The largest buyer was BAMCO Inc, adding an estimated $46.8M. The largest seller was Citadel Advisors, exiting entirely with an estimated $12.2M sold.
- 91 institutional investors held BillionToOne Inc (BLLN) as of Q1 2026, unchanged from Q4 2025.
- Funds reported $875M of BillionToOne Inc stock for Q1 2026, up 11% quarter-over-quarter.
- 29 funds opened new BillionToOne Inc positions in Q1 2026 and 28 closed out, a net change of +1 holder.
- The largest BillionToOne Inc buyer in Q1 2026 was BAMCO Inc, an estimated $46.8M added.
- The largest BillionToOne Inc seller in Q1 2026 was Citadel Advisors, an estimated $12.2M sold.
Based on aggregated 13F filings for Q1 2026.