BillionToOne (BLLN)
BillionToOne on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as services-medical laboratories.
2.8M
Short interest
settlement 2026-09-30
3.9
Days to cover
-1.0 days vs prior
40.9%
Short share of volume
2026-10-12
35,079
Fails to deliver
settlement 2026-09-09
Mon 11 Jan
Next earnings
estimated date
-$28.5M
Insider flow, 90 days
0 buys, 80 sells
As of 2026-10-13.
Short interest
FINRA, twice a month. The newest 22 settlements in the table, 22 in the chart. JSONAs of 30 September 2026, short interest in BLLN is 2,818,267 shares, up 469,663 shares over the last month. Over the last 22 readings it ranged from 54,673 shares (14 November 2025) to 2,818,267 shares (30 September 2026). The latest reading sits at the top of that range. At the reported average volume of 726K shares a day that is 3.9 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 2,818,267 | +7.3% | 725,773 | 3.88 |
| 2026-09-15 | 2,625,520 | +11.8% | 542,824 | 4.84 |
| 2026-08-31 | 2,348,604 | +20.5% | 563,116 | 4.17 |
| 2026-08-14 | 1,949,158 | +1.5% | 1,080,966 | 1.80 |
| 2026-07-31 | 1,920,601 | -20.2% | 568,120 | 3.38 |
| 2026-07-15 | 2,407,203 | -0.7% | 673,065 | 3.58 |
| 2026-06-30 | 2,424,403 | +34.2% | 818,529 | 2.96 |
| 2026-06-15 | 1,806,499 | +7.4% | 828,883 | 2.18 |
| 2026-05-29 | 1,681,847 | +14.8% | 596,719 | 2.82 |
| 2026-05-15 | 1,465,466 | -36.2% | 935,515 | 1.57 |
| 2026-04-30 | 2,298,545 | +18.5% | 387,699 | 5.93 |
| 2026-04-15 | 1,940,036 | +18.2% | 423,610 | 4.58 |
| 2026-03-31 | 1,641,344 | +25.3% | 250,605 | 6.55 |
| 2026-03-13 | 1,309,571 | +12.1% | 414,209 | 3.16 |
| 2026-02-27 | 1,168,738 | +18.2% | 265,214 | 4.41 |
| 2026-02-13 | 988,847 | +7.2% | 171,397 | 5.77 |
| 2026-01-30 | 922,879 | +29.6% | 239,061 | 3.86 |
| 2026-01-15 | 712,193 | +20.1% | 240,461 | 2.96 |
| 2025-12-31 | 592,757 | +88.0% | 231,137 | 2.56 |
| 2025-12-15 | 315,303 | +79.5% | 185,141 | 1.70 |
| 2025-11-28 | 175,681 | +221.3% | 181,490 | 1.00 |
| 2025-11-14 | 54,673 | +100.0% | 275,347 | 1.00 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 12 October 2026, the short share of BLLN volume is 40.9%, down 21.7 points over the last five sessions. Over the last 30 readings it ranged from 40.9% (12 October 2026) to 72.9% (31 August 2026). The latest reading sits at the bottom of that range. The latest reading is 19.5 points below the 30-session average of 60.3%, on 253K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-12 | 104K | 253K | 40.9% | 212 |
| 2026-10-09 | 89K | 142K | 62.8% | 104 |
| 2026-10-08 | 80K | 157K | 51.1% | 0 |
| 2026-10-07 | 197K | 388K | 50.7% | 204 |
| 2026-10-06 | 439K | 625K | 70.3% | 9 |
| 2026-10-05 | 104K | 166K | 62.6% | 525 |
| 2026-10-02 | 125K | 174K | 71.6% | 0 |
| 2026-10-01 | 147K | 214K | 68.4% | 3,287 |
| 2026-09-30 | 232K | 383K | 60.5% | 2,112 |
| 2026-09-29 | 80K | 177K | 45.4% | 0 |
| 2026-09-28 | 68K | 147K | 46.4% | 0 |
| 2026-09-25 | 159K | 261K | 61.0% | 0 |
| 2026-09-24 | 265K | 460K | 57.6% | 761 |
| 2026-09-23 | 104K | 170K | 61.1% | 40 |
| 2026-09-22 | 297K | 568K | 52.4% | 373 |
| 2026-09-21 | 123K | 193K | 63.5% | 38 |
| 2026-09-18 | 152K | 245K | 62.2% | 148 |
| 2026-09-17 | 138K | 238K | 57.8% | 1,125 |
| 2026-09-16 | 111K | 188K | 59.1% | 0 |
| 2026-09-15 | 103K | 150K | 68.8% | 0 |
| 2026-09-14 | 129K | 186K | 69.6% | 0 |
| 2026-09-11 | 118K | 235K | 50.3% | 0 |
| 2026-09-10 | 184K | 274K | 67.4% | 100 |
| 2026-09-09 | 138K | 233K | 59.3% | 0 |
| 2026-09-08 | 140K | 224K | 62.3% | 953 |
| 2026-09-04 | 325K | 493K | 66.0% | 100 |
| 2026-09-03 | 213K | 298K | 71.4% | 1 |
| 2026-09-02 | 119K | 178K | 66.5% | 500 |
| 2026-09-01 | 112K | 223K | 50.2% | 354 |
| 2026-08-31 | 158K | 217K | 72.9% | 20 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 9 September 2026, the fails-to-deliver balance in BLLN is 35,079 shares, unchanged over the last settlement date. Over the last 30 readings it ranged from 1 share (17 July 2026) to 273,901 shares (7 August 2026).
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-09 | 35,079 | $99.06 | $3.5M |
| 2026-09-08 | 35,079 | $99.39 | $3.5M |
| 2026-09-04 | 2,622 | $99.50 | $261K |
| 2026-09-01 | 13 | $90.67 | $1K |
| 2026-08-31 | 1,003 | $93.24 | $94K |
| 2026-08-27 | 34 | $96.22 | $3K |
| 2026-08-26 | 1,696 | $100.08 | $170K |
| 2026-08-25 | 34 | $96.74 | $3K |
| 2026-08-21 | 10,210 | $95.27 | $973K |
| 2026-08-18 | 1,077 | $93.91 | $101K |
| 2026-08-14 | 746 | $94.04 | $70K |
| 2026-08-07 | 273,901 | $91.65 | $25.1M |
| 2026-08-04 | 4,789 | $137.32 | $658K |
| 2026-08-03 | 21 | $138.60 | $3K |
| 2026-07-29 | 28 | $133.64 | $4K |
| 2026-07-27 | 46 | $126.08 | $6K |
| 2026-07-24 | 1,706 | $128.94 | $220K |
| 2026-07-21 | 34 | $125.14 | $4K |
| 2026-07-20 | 167 | $130.31 | $22K |
| 2026-07-17 | 1 | $128.18 | $128 |
| 2026-07-09 | 9,599 | $120.60 | $1.2M |
| 2026-07-08 | 3,481 | $118.04 | $411K |
| 2026-06-29 | 28,168 | $118.17 | $3.3M |
| 2026-06-26 | 2,778 | $112.24 | $312K |
| 2026-06-25 | 66 | $107.74 | $7K |
| 2026-06-24 | 1,816 | $104.28 | $189K |
| 2026-06-23 | 22,461 | $100.72 | $2.3M |
| 2026-06-22 | 6,887 | $105.15 | $724K |
| 2026-06-17 | 39 | $100.70 | $4K |
| 2026-06-16 | 3,448 | $103.95 | $358K |
Insider trades
SEC Form 4, newest first, 50 of 100 shown. JSONInsiders at BLLN reported 80 open-market sells worth $28.5M in the last 90 days and no open-market buys. Latest filing: Tsao David (Chief Technology Officer) on 2026-10-05.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-05 | Tsao David | Chief Technology Officer | Sell | 100 | $110.09 | $11K | 1K |
| 2026-10-05 | Tsao David | Chief Technology Officer | Sell | 2K | $109.14 | $200K | 1K |
| 2026-10-05 | Tsao David | Chief Technology Officer | Sell | 5K | $108.53 | $534K | 3K |
| 2026-10-05 | Tsao David | Chief Technology Officer | Sell | 2K | $107.47 | $236K | 8K |
| 2026-10-05 | Tsao David | Chief Technology Officer | Sell | 400 | $106.10 | $42K | 10K |
| 2026-10-05 | Tsao David | Chief Technology Officer | Sell | 555 | $105.56 | $59K | 10K |
| 2026-10-05 | Tsao David | Chief Technology Officer | Sell | 20 | $110.08 | $2K | 11K |
| 2026-10-05 | Tsao David | Chief Technology Officer | Sell | 3K | $109.00 | $318K | 11K |
| 2026-10-05 | Tsao David | Chief Technology Officer | Sell | 4K | $108.39 | $464K | 14K |
| 2026-10-05 | Tsao David | Chief Technology Officer | Sell | 2K | $107.19 | $205K | 18K |
| 2026-10-05 | Tsao David | Chief Technology Officer | Sell | 866 | $105.90 | $92K | 20K |
| 2026-10-05 | Tsao David | Chief Technology Officer | Option exercise | 10K | $2.80 | $28K | 11K |
| 2026-10-05 | ten Bosch John Roderick | SVP of Laboratory Operations | Sell | 1K | $105.15 | $149K | 21K |
| 2026-09-28 | Atay Oguzhan | Chairman and CEO | Sell | 3K | $120.64 | $322K | 155K |
| 2026-09-28 | Atay Oguzhan | Chairman and CEO | Sell | 8K | $120.64 | $1.0M | 0 |
| 2026-09-28 | Atay Oguzhan | Chairman and CEO | Option exercise | 8K | $2.80 | $23K | 8K |
| 2026-09-24 | ten Bosch John Roderick | SVP of Laboratory Operations | Sell | 1K | $120.00 | $170K | 22K |
| 2026-09-24 | Tsao David | Chief Technology Officer | Sell | 3K | $125.00 | $417K | 1K |
| 2026-09-24 | Tsao David | Chief Technology Officer | Option exercise | 3K | $2.80 | $9K | 4K |
| 2026-09-21 | ten Bosch John Roderick | SVP of Laboratory Operations | Sell | 1K | $106.61 | $151K | 24K |
| 2026-09-17 | Lynch Thomas P. | See Remarks | Sell | 6K | $110.29 | $644K | 700 |
| 2026-09-17 | Lynch Thomas P. | See Remarks | Sell | 3K | $110.31 | $322K | 7K |
| 2026-09-17 | Lynch Thomas P. | See Remarks | Sell | 7K | $110.30 | $769K | 9K |
| 2026-09-17 | Lynch Thomas P. | See Remarks | Sell | 19K | $110.36 | $2.1M | 16K |
| 2026-09-17 | Lynch Thomas P. | See Remarks | Option exercise | 6K | $30.78 | $180K | 36K |
| 2026-09-17 | Lynch Thomas P. | See Remarks | Option exercise | 3K | $17.12 | $50K | 30K |
| 2026-09-17 | Lynch Thomas P. | See Remarks | Option exercise | 7K | $11.55 | $80K | 27K |
| 2026-09-17 | Lynch Thomas P. | See Remarks | Option exercise | 19K | $8.65 | $168K | 20K |
| 2026-09-14 | Atay Oguzhan | Chairman and CEO | Sell | 3K | $98.00 | $261K | 157K |
| 2026-09-14 | Atay Oguzhan | Chairman and CEO | Sell | 3K | $98.00 | $261K | 160K |
| 2026-09-14 | Atay Oguzhan | Chairman and CEO | Sell | 3K | $101.49 | $319K | 0 |
| 2026-09-14 | Atay Oguzhan | Chairman and CEO | Sell | 2K | $100.78 | $203K | 3K |
| 2026-09-14 | Atay Oguzhan | Chairman and CEO | Sell | 2K | $99.57 | $149K | 5K |
| 2026-09-14 | Atay Oguzhan | Chairman and CEO | Sell | 2K | $98.64 | $166K | 7K |
| 2026-09-14 | Atay Oguzhan | Chairman and CEO | Sell | 7K | $101.44 | $732K | 8K |
| 2026-09-14 | Atay Oguzhan | Chairman and CEO | Sell | 3K | $100.58 | $255K | 16K |
| 2026-09-14 | Atay Oguzhan | Chairman and CEO | Sell | 2K | $99.57 | $245K | 18K |
| 2026-09-14 | Atay Oguzhan | Chairman and CEO | Sell | 4K | $98.63 | $440K | 21K |
| 2026-09-14 | Atay Oguzhan | Chairman and CEO | Option exercise | 8K | $2.80 | $23K | 25K |
| 2026-09-14 | Atay Oguzhan | Chairman and CEO | Option exercise | 17K | $2.80 | $47K | 17K |
| 2026-09-10 | Sakakibara Shan Riku | Chief Product Officer | Gift | 4K | $0.00 | $0 | 197K |
| 2026-09-09 | Tsao David | Chief Technology Officer | Sell | 10K | $100.00 | $1.0M | 1K |
| 2026-09-09 | Tsao David | Chief Technology Officer | Option exercise | 10K | $2.80 | $28K | 21K |
| 2026-09-09 | Tsao David | Chief Technology Officer | Sell | 10K | $97.54 | $975K | 11K |
| 2026-09-09 | Tsao David | Chief Technology Officer | Option exercise | 10K | $2.80 | $28K | 11K |
| 2026-09-09 | ten Bosch John Roderick | SVP of Laboratory Operations | Sell | 1K | $97.54 | $138K | 25K |
| 2026-09-09 | Atay Oguzhan | Chairman and CEO | Gift | 20K | $0.00 | $0 | 0 |
| 2026-09-08 | Lynch Thomas P. | See Remarks | Sell | 232 | $100.92 | $23K | 700 |
| 2026-09-08 | Lynch Thomas P. | See Remarks | Sell | 3K | $100.20 | $252K | 932 |
| 2026-09-08 | Lynch Thomas P. | See Remarks | Sell | 576 | $98.89 | $57K | 3K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Planned sales (Form 144)
Newest first. JSON49 Form 144 notices on file for BLLN worth $51.3M at the prices reported; 29 in the last 90 days worth $32.5M. Latest: Atay Oguzhan filed on 2026-10-13 to sell 16,667 shares ($1.6M) from 2026-10-12.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-10-13 | Atay OguzhanOfficer, Director | 17K | $1.6M | 0.039% | 2026-10-12 | Fidelity Brokerage Services LLC |
| 2026-10-13 | Atay OguzhanMember of immediate family of any of the foregoing | 3K | $260K | 0.006% | 2026-10-12 | Fidelity Brokerage Services LLC |
| 2026-10-05 | Tsao DavidOfficer, Director | 20K | $2.2M | 0.047% | 2026-10-05 | Fidelity Brokerage Services LLC |
| 2026-10-05 | ten Bosch John RoderickOfficer | 3K | $298K | 0.007% | 2026-10-05 | Fidelity Brokerage Services LLC |
| 2026-10-05 | Tsao DavidOfficer, Director | 2K | $184K | 0.004% | 2026-10-05 | Fidelity Brokerage Services LLC |
| 2026-09-28 | Atay OguzhanMember of immediate family of any of the foregoing | 3K | $322K | 0.006% | 2026-09-28 | Fidelity Brokerage Services LLC |
| 2026-09-28 | Atay OguzhanOfficer, Director | 8K | $1.0M | 0.020% | 2026-09-28 | Fidelity Brokerage Services LLC |
| 2026-09-24 | Tsao DavidOfficer, Director | 3K | $417K | 0.008% | 2026-09-24 | Fidelity Brokerage Services LLC |
| 2026-09-24 | ten Bosch John RoderickOfficer | 1K | $170K | 0.003% | 2026-09-24 | Fidelity Brokerage Services LLC |
| 2026-09-21 | ten Bosch John RoderickOfficer | 1K | $151K | 0.003% | 2026-09-21 | Fidelity Brokerage Services LLC |
| 2026-09-17 | Lynch Thomas P.Officer | 35K | $3.9M | 0.082% | 2026-09-17 | Fidelity Brokerage Services LLC |
| 2026-09-14 | Atay OguzhanOfficer, Director | 25K | $2.5M | 0.059% | 2026-09-14 | Fidelity Brokerage Services LLC |
| 2026-09-14 | Atay OguzhanMember of immediate family of any of the foregoing | 5K | $523K | 0.013% | 2026-09-14 | Fidelity Brokerage Services LLC |
| 2026-09-09 | Tsao DavidOfficer, Director | 2K | $171K | 0.004% | 2026-09-09 | Fidelity Brokerage Services LLC |
| 2026-09-09 | Tsao DavidOfficer, Director | 20K | $2.0M | 0.047% | 2026-09-09 | Fidelity Brokerage Services LLC |
| 2026-09-09 | ten Bosch John RoderickOfficer | 1K | $138K | 0.003% | 2026-09-09 | Fidelity Brokerage Services LLC |
| 2026-09-08 | Lynch Thomas P.Officer | 20K | $2.0M | 0.047% | 2026-09-08 | Fidelity Brokerage Services LLC |
| 2026-08-25 | Tsao DavidOfficer, Director | 10K | $1.0M | 0.023% | 2026-08-25 | Fidelity Brokerage Services LLC |
| 2026-08-25 | ten Bosch John RoderickOfficer | 1K | $142K | 0.003% | 2026-08-25 | Fidelity Brokerage Services LLC |
| 2026-08-10 | Tsao DavidOfficer, Director | 10K | $929K | 0.023% | 2026-08-10 | Fidelity Brokerage Services LLC |
| 2026-08-10 | ten Bosch John RoderickOfficer | 1K | $132K | 0.003% | 2026-08-10 | Fidelity Brokerage Services LLC |
| 2026-08-10 | Tsao DavidOfficer, Director | 4K | $325K | 0.008% | 2026-08-10 | Fidelity Brokerage Services LLC |
| 2026-08-10 | Tsao DavidOfficer, Director | 10K | $929K | 0.023% | 2026-08-10 | Fidelity Brokerage Services LLC |
| 2026-08-05 | Atay OguzhanOfficer, Director | 16K | $2.3M | 0.037% | 2026-08-05 | Fidelity Brokerage Services LLC |
| 2026-08-03 | Atay OguzhanOfficer, Director | 3K | $343K | 0.006% | 2026-08-03 | Fidelity Brokerage Services LLC |
| 2026-08-03 | Atay OguzhanMember of immediate family of any of the foregoing | 13K | $1.7M | 0.030% | 2026-08-03 | Fidelity Brokerage Services LLC |
| 2026-08-03 | Atay OguzhanOfficer, Director | 33K | $4.5M | 0.078% | 2026-08-03 | Fidelity Brokerage Services LLC |
| 2026-07-31 | Sakakibara Shan RikuOfficer | 4K | $561K | 0.010% | 2026-07-31 | Fidelity Brokerage Services LLC |
| 2026-07-16 | Johnson Nancy JoAnnOfficer | 14K | $1.8M | 0.034% | 2026-07-16 | Fidelity Brokerage Services LLC |
| 2026-07-13 | Tsao DavidOfficer, Director | 20K | $250K | 0.048% | 2026-07-13 | Fidelity Brokerage Services LLC |
| 2026-07-13 | ten Bosch John RoderickOfficer | 4K | $533K | 0.010% | 2026-07-13 | Fidelity Brokerage Services LLC |
| 2026-07-13 | Tsao DavidOfficer, Director | 4K | $439K | 0.008% | 2026-07-13 | Fidelity Brokerage Services LLC |
| 2026-07-09 | Sakakibara Shan RikuOfficer | 8K | $1.0M | 0.019% | 2026-07-09 | Fidelity Brokerage Services LLC |
| 2026-07-09 | Atay OguzhanOfficer, Director | 13K | $1.6M | 0.030% | 2026-07-09 | Fidelity Brokerage Services LLC |
| 2026-07-06 | Atay OguzhanMember of immediate family of any of the foregoing | 13K | $1.5M | 0.030% | 2026-07-06 | Fidelity Brokerage Services LLC |
| 2026-07-06 | Atay OguzhanOfficer, Director | 26K | $3.1M | 0.063% | 2026-07-06 | Fidelity Brokerage Services LLC |
| 2026-07-06 | Atay OguzhanOfficer, Director | 3K | $300K | 0.006% | 2026-07-06 | Fidelity Brokerage Services LLC |
| 2026-07-01 | Johnson Nancy JoAnnOfficer | 801 | $100K | 0.002% | 2026-07-01 | Fidelity Brokerage Services LLC |
| 2026-06-29 | ten Bosch John RoderickOfficer | 1K | $170K | 0.003% | 2026-06-29 | Fidelity Brokerage Services LLC |
| 2026-06-24 | Sakakibara Shan RikuOfficer | 8K | $880K | 0.019% | 2026-06-24 | Fidelity Brokerage Services LLC |
| 2026-06-15 | Tsao DavidOfficer, Director | 20K | $2.0M | 0.048% | 2026-06-15 | Fidelity Brokerage Services LLC |
| 2026-06-15 | Tsao DavidOfficer, Director | 4K | $355K | 0.008% | 2026-06-15 | Fidelity Brokerage Services LLC |
| 2026-06-15 | ten Bosch John RoderickOfficer | 3K | $287K | 0.007% | 2026-06-15 | Fidelity Brokerage Services LLC |
| 2026-06-09 | Johnson Nancy JoAnnOfficer | 11K | $1.1M | 0.026% | 2026-06-09 | Fidelity Brokerage Services LLC |
| 2026-06-08 | Johnson Nancy JoAnnOfficer | 3K | $339K | 0.008% | 2026-06-08 | Fidelity Brokerage Services LLC |
| 2026-06-08 | Sakakibara Shan RikuOfficer | 8K | $786K | 0.019% | 2026-06-08 | Fidelity Brokerage Services LLC |
| 2026-06-08 | Atay OguzhanOfficer, Director | 26K | $2.6M | 0.063% | 2026-06-08 | Fidelity Brokerage Services LLC |
| 2026-06-08 | Atay OguzhanOfficer, Director | 3K | $246K | 0.006% | 2026-06-08 | Fidelity Brokerage Services LLC |
| 2026-06-08 | Atay OguzhanMember of immediate family of any of the foregoing | 13K | $1.2M | 0.030% | 2026-06-08 | Fidelity Brokerage Services LLC |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON12 holders report 5% or more of BLLN in their latest filing, 7 on Schedule 13D (active intent). The largest reported stake is Lukas Decoster at 19.6% of the class (7,887,237 shares), filed 2026-01-20 for an event on 2025-11-06.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-02-17 | 13G | David Tsaoindividual | 3.0M | 6.9% | 2025-12-31 |
| 2026-02-17 | 13G | Oguzhan Atayindividual | 3.2M | 7.3% | 2025-12-31 |
| 2026-02-13 | 13G | Krishna Kittu Kolluri ("Kolluri")individual | 4.4M | 10.6% | 2025-11-07 |
| 2026-02-13 | 13G | NeoTribe Partners I, LLC ("NTP I")other entity | 2.8M | 6.8% | 2025-11-07 |
| 2026-02-13 | 13G | NeoTribe Ventures I, L.P. ("NTV I")partnership | 2.7M | 6.6% | 2025-11-07 |
| 2026-02-13 | 13G | Neotribe Ignite Partners I, LLC ("NTIP I")other entity | 1.3M | 3.1% | 2025-11-07 |
| 2026-02-13 | 13G | Neotribe Ignite Fund I, L.P. ("NTIF I")partnership | 1.3M | 3.1% | 2025-11-07 |
| 2026-02-13 | 13G | Neotribe SPV I BTO, LLC ("NT SPV I")other entity | 242K | 0.6% | 2025-11-07 |
| 2026-02-13 | 13G | Neotribe Partners SPV I BTO, LLC ("NTP SPV I")other entity | 242K | 0.6% | 2025-11-07 |
| 2026-02-13 | 13G | NeoTribe Associates I, L.P. ("NTA I")partnership | 109K | 0.3% | 2025-11-07 |
| 2026-01-20 | 13D | Lukas Decosterindividual | 7.9M | 19.6% | 2025-11-06 |
| 2026-01-20 | 13D | Hummingbird Ventures Management NVcorporation | 7.9M | 19.6% | 2025-11-06 |
| 2026-01-20 | 13D | Firat Ileriindividual | 7.9M | 19.6% | 2025-11-06 |
| 2026-01-20 | 13D | Barend Van den Brandeindividual | 7.9M | 19.6% | 2025-11-06 |
| 2026-01-20 | 13D | Hummingbird Opportunity Fund II CommVpartnership | 2.6M | 6.5% | 2025-11-06 |
| 2026-01-20 | 13D | Hummingbird Ventures III CommVpartnership | 2.6M | 6.4% | 2025-11-06 |
| 2026-01-20 | 13D | Hummingbird Dragons CommVpartnership | 2.0M | 5.0% | 2025-11-06 |
| 2026-01-20 | 13D | HB&Q NVcorporation | 641K | 1.6% | 2025-11-06 |
| 2026-01-20 | 13D | Hummingbird Collective CommVpartnership | 19K | 0.1% | 2025-11-06 |
13F holders
Tracked managers holding BLLN at their latest 13F. JSON5 of the 30 tracked managers held BLLN at their latest 13F, $71.1M in total at quarter-end prices. Millennium Management is the largest at $51.0M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 4 added shares and 1 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Millennium Management | 2026-06-30 | 425K | $51.0M | 0.02% | new |
| Renaissance Technologies | 2026-06-30 | 97K | $11.6M | 0.02% | +45K |
| Two Sigma Investments | 2026-06-30 | 30K | $3.6M | 0.00% | -53K |
| D. E. Shaw & Co. | 2026-06-30 | 26K | $3.1M | 0.00% | +22K |
| Citadel Advisors | 2026-06-30 | 15K | $1.8M | 0.00% | new |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
What this page is
BillionToOne in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows BillionToOne (BLLN), SEC CIK 2070849, listed on Nasdaq, classified by the SEC as services-medical laboratories. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-12.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-09.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-10-13.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-02-17.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-05.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-10-05.JSON and CSV
- Company record
- EDGAR filing index for CIK 2070849Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
Other companies the SEC classifies as services-medical laboratories
Other company pages
Datasets
Frequently Asked Questions
How much of BLLN is sold short?
2,818,267 shares were held short at the 2026-09-30 settlement, 3.9 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is BLLN's daily short volume?
On 2026-10-12, 103,605 of the 253,401 BLLN shares reported to FINRA were sold short, 40.9% of the day's reported volume. Short volume is a flow for one day, not a position.
Does BLLN have fails to deliver?
The SEC's latest file shows 35,079 BLLN shares failed to deliver at settlement 2026-09-09. Fails are reported per settlement date and published twice a month with a lag.
Are BLLN insiders buying or selling?
Insiders at BLLN reported 80 open-market sells worth $28.5M in the last 90 days and no open-market buys. Latest filing: Tsao David (Chief Technology Officer) on 2026-10-05.
Have BLLN insiders filed to sell?
49 Form 144 notices on file for BLLN worth $51.3M at the prices reported; 29 in the last 90 days worth $32.5M. Latest: Atay Oguzhan filed on 2026-10-13 to sell 16,667 shares ($1.6M) from 2026-10-12.
Who owns 5% or more of BLLN?
12 holders report 5% or more of BLLN in their latest filing, 7 on Schedule 13D (active intent). The largest reported stake is Lukas Decoster at 19.6% of the class (7,887,237 shares), filed 2026-01-20 for an event on 2025-11-06.
Which tracked 13F managers own BLLN?
5 of the 30 tracked 13F managers held BLLN shares at their latest filing, $71.1M in all. The largest: Izzy Englander's Millennium Management (425K shares, $51.0M), Renaissance Technologies (97K shares, $11.6M), Two Sigma Investments (30K shares, $3.6M), D. E. Shaw & Co. (26K shares, $3.1M), Ken Griffin's Citadel Advisors (15K shares, $1.8M).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.