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BLLN · BillionToOne, Inc.

Everything on this page is public record — SEC Form 4 filings and congressional disclosures — alongside any INSIDER SCANNER research case for this company.

Open-market buys0
Open-market sells61
Research cases0
Last filing2026-10-15

Insider flow: Selling only — a count of disclosed transactions, not a rating or a recommendation.

Insider transaction timeline

Every reported transaction, positioned by trade date. Purchases sit above the axis, sales below; circle area is proportional to dollar value. No share-price line is drawn — this feed carries transaction prices only, and a price history inferred from them would imply market data the filings do not contain.

Open-market purchase Open-market sale
2026-08-25 — ten Bosch John Roderick · sold 1,417 @ $100.00 2026-08-25 — Tsao David · sold 10,000 @ $100.00 2026-09-08 — Lynch Thomas P. · sold 1,131 @ $100.33 2026-09-08 — Lynch Thomas P. · sold 147 @ $101.41 2026-09-08 — Lynch Thomas P. · sold 1,944 @ $98.97 2026-09-08 — Lynch Thomas P. · sold 232 @ $100.92 2026-09-08 — Lynch Thomas P. · sold 2,518 @ $100.20 2026-09-08 — Lynch Thomas P. · sold 2,997 @ $100.11 2026-09-08 — Lynch Thomas P. · sold 358 @ $100.82 2026-09-08 — Lynch Thomas P. · sold 38 @ $96.47 2026-09-08 — Lynch Thomas P. · sold 385 @ $99.22 2026-09-08 — Lynch Thomas P. · sold 576 @ $98.89 2026-09-08 — Lynch Thomas P. · sold 614 @ $99.00 2026-09-08 — Lynch Thomas P. · sold 775 @ $100.83 2026-09-08 — Lynch Thomas P. · sold 8,285 @ $100.12 2026-09-09 — ten Bosch John Roderick · sold 1,416 @ $97.54 2026-09-09 — Tsao David · sold 10,000 @ $100.00 2026-09-14 — Atay Oguzhan · sold 4,465 @ $98.63 2026-09-14 — Atay Oguzhan · sold 2,456 @ $99.57 2026-09-14 — Atay Oguzhan · sold 2,531 @ $100.58 2026-09-14 — Atay Oguzhan · sold 7,214 @ $101.44 2026-09-14 — Atay Oguzhan · sold 1,680 @ $98.64 2026-09-14 — Atay Oguzhan · sold 1,500 @ $99.57 2026-09-14 — Atay Oguzhan · sold 2,010 @ $100.78 2026-09-14 — Atay Oguzhan · sold 3,143 @ $101.49 2026-09-14 — Atay Oguzhan · sold 2,666 @ $98.00 2026-09-17 — Lynch Thomas P. · sold 19,384 @ $110.36 2026-09-17 — Lynch Thomas P. · sold 2,920 @ $110.31 2026-09-17 — Lynch Thomas P. · sold 5,840 @ $110.29 2026-09-17 — Lynch Thomas P. · sold 6,968 @ $110.30 2026-09-21 — ten Bosch John Roderick · sold 1,416 @ $106.61 2026-09-24 — ten Bosch John Roderick · sold 1,416 @ $120.00 2026-09-24 — Tsao David · sold 3,333 @ $125.00 2026-09-28 — Atay Oguzhan · sold 2,666 @ $120.64 2026-09-28 — Atay Oguzhan · sold 8,333 @ $120.64 2026-10-05 — ten Bosch John Roderick · sold 1,417 @ $105.15 2026-10-05 — Tsao David · sold 866 @ $105.90 2026-10-05 — Tsao David · sold 1,909 @ $107.19 2026-10-05 — Tsao David · sold 4,284 @ $108.39 2026-10-05 — Tsao David · sold 2,921 @ $109.00 2026-10-05 — Tsao David · sold 20 @ $110.08 2026-10-05 — Tsao David · sold 555 @ $105.56 2026-10-05 — Tsao David · sold 400 @ $106.10 2026-10-05 — Tsao David · sold 2,200 @ $107.47 2026-10-05 — Tsao David · sold 4,916 @ $108.53 2026-10-05 — Tsao David · sold 1,829 @ $109.14 2026-10-05 — Tsao David · sold 100 @ $110.09 2026-10-12 — Atay Oguzhan · sold 1,961 @ $91.57 2026-10-12 — Atay Oguzhan · sold 2,553 @ $93.05 2026-10-12 — Atay Oguzhan · sold 6,763 @ $93.65 2026-10-12 — Atay Oguzhan · sold 3,869 @ $94.61 2026-10-12 — Atay Oguzhan · sold 1,521 @ $96.39 2026-10-12 — Atay Oguzhan · sold 2,667 @ $97.61 2026-10-14 — Atay Oguzhan · sold 3,083 @ $98.32 2026-10-14 — Atay Oguzhan · sold 100 @ $99.00 2026-10-14 — Atay Oguzhan · sold 2,667 @ $98.00 2026-10-15 — Atay Oguzhan · sold 900 @ $98.43 2026-10-15 — Atay Oguzhan · sold 1,861 @ $99.84 2026-10-15 — Atay Oguzhan · sold 1,276 @ $100.60 2026-10-15 — Atay Oguzhan · sold 980 @ $101.79 2026-10-15 — Atay Oguzhan · sold 133 @ $102.78
2026-08-252026-10-15

Insider participation

One row per insider, one cell per reported transaction, shaded by value. Repeat buying and activity clustered in time are visible at a glance.

Atay Oguzhan Chairman and CEO, Director
Lynch Thomas P. See Remarks
Tsao David Chief Technology Officer, Director
ten Bosch John Roderick SVP of Laboratory Operations
Included with a free account

The analysis built on top of these filings

The filings above are public record and stay public here. What an account adds for $BLLN is the reading of them — and for this company, that is what the list below says it is, no more.

  • Transaction timelineThe [{'transaction_date': '2026-10-15', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 900.0, 'price': 98.4328, 'value': 88589.52, 'is_buy': False}, {'transaction_date': '2026-10-15', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 1861.0, 'price': 99.8438, 'value': 185809.31, 'is_buy': False}, {'transaction_date': '2026-10-15', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 1276.0, 'price': 100.6029, 'value': 128369.3, 'is_buy': False}, {'transaction_date': '2026-10-15', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 980.0, 'price': 101.7871, 'value': 99751.36, 'is_buy': False}, {'transaction_date': '2026-10-15', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 133.0, 'price': 102.7766, 'value': 13669.29, 'is_buy': False}, {'transaction_date': '2026-10-14', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 3083.0, 'price': 98.3198, 'value': 303119.94, 'is_buy': False}, {'transaction_date': '2026-10-14', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 100.0, 'price': 99.0, 'value': 9900.0, 'is_buy': False}, {'transaction_date': '2026-10-14', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 2667.0, 'price': 98.0, 'value': 261366.0, 'is_buy': False}, {'transaction_date': '2026-10-12', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 1961.0, 'price': 91.5712, 'value': 179571.12, 'is_buy': False}, {'transaction_date': '2026-10-12', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 2553.0, 'price': 93.046, 'value': 237546.44, 'is_buy': False}, {'transaction_date': '2026-10-12', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 6763.0, 'price': 93.647, 'value': 633334.66, 'is_buy': False}, {'transaction_date': '2026-10-12', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 3869.0, 'price': 94.6133, 'value': 366058.86, 'is_buy': False}, {'transaction_date': '2026-10-12', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 1521.0, 'price': 96.3924, 'value': 146612.84, 'is_buy': False}, {'transaction_date': '2026-10-12', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 2667.0, 'price': 97.61, 'value': 260325.87, 'is_buy': False}, {'transaction_date': '2026-10-05', 'insider_name': 'ten Bosch John Roderick', 'insider_title': 'SVP of Laboratory Operations', 'transaction_type': 'Open-market sell', 'shares': 1417.0, 'price': 105.15, 'value': 148997.55, 'is_buy': False}, {'transaction_date': '2026-10-05', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 866.0, 'price': 105.9004, 'value': 91709.75, 'is_buy': False}, {'transaction_date': '2026-10-05', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 1909.0, 'price': 107.195, 'value': 204635.25, 'is_buy': False}, {'transaction_date': '2026-10-05', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 4284.0, 'price': 108.393, 'value': 464355.61, 'is_buy': False}, {'transaction_date': '2026-10-05', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 2921.0, 'price': 109.0031, 'value': 318398.06, 'is_buy': False}, {'transaction_date': '2026-10-05', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 20.0, 'price': 110.08, 'value': 2201.6, 'is_buy': False}, {'transaction_date': '2026-10-05', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 555.0, 'price': 105.5587, 'value': 58585.08, 'is_buy': False}, {'transaction_date': '2026-10-05', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 400.0, 'price': 106.1038, 'value': 42441.52, 'is_buy': False}, {'transaction_date': '2026-10-05', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 2200.0, 'price': 107.4705, 'value': 236435.1, 'is_buy': False}, {'transaction_date': '2026-10-05', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 4916.0, 'price': 108.5342, 'value': 533554.13, 'is_buy': False}, {'transaction_date': '2026-10-05', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 1829.0, 'price': 109.1445, 'value': 199625.29, 'is_buy': False}, {'transaction_date': '2026-10-05', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 100.0, 'price': 110.09, 'value': 11009.0, 'is_buy': False}, {'transaction_date': '2026-09-28', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 2666.0, 'price': 120.64, 'value': 321626.24, 'is_buy': False}, {'transaction_date': '2026-09-28', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 8333.0, 'price': 120.64, 'value': 1005293.12, 'is_buy': False}, {'transaction_date': '2026-09-24', 'insider_name': 'ten Bosch John Roderick', 'insider_title': 'SVP of Laboratory Operations', 'transaction_type': 'Open-market sell', 'shares': 1416.0, 'price': 120.0, 'value': 169920.0, 'is_buy': False}, {'transaction_date': '2026-09-24', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 3333.0, 'price': 125.0, 'value': 416625.0, 'is_buy': False}, {'transaction_date': '2026-09-21', 'insider_name': 'ten Bosch John Roderick', 'insider_title': 'SVP of Laboratory Operations', 'transaction_type': 'Open-market sell', 'shares': 1416.0, 'price': 106.61, 'value': 150959.76, 'is_buy': False}, {'transaction_date': '2026-09-17', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 19384.0, 'price': 110.36, 'value': 2139218.24, 'is_buy': False}, {'transaction_date': '2026-09-17', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 2920.0, 'price': 110.31, 'value': 322105.2, 'is_buy': False}, {'transaction_date': '2026-09-17', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 5840.0, 'price': 110.29, 'value': 644093.6, 'is_buy': False}, {'transaction_date': '2026-09-17', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 6968.0, 'price': 110.3, 'value': 768570.4, 'is_buy': False}, {'transaction_date': '2026-09-14', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 4465.0, 'price': 98.6314, 'value': 440389.2, 'is_buy': False}, {'transaction_date': '2026-09-14', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 2456.0, 'price': 99.5713, 'value': 244547.11, 'is_buy': False}, {'transaction_date': '2026-09-14', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 2531.0, 'price': 100.5809, 'value': 254570.26, 'is_buy': False}, {'transaction_date': '2026-09-14', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 7214.0, 'price': 101.4407, 'value': 731793.21, 'is_buy': False}, {'transaction_date': '2026-09-14', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 1680.0, 'price': 98.6358, 'value': 165708.14, 'is_buy': False}, {'transaction_date': '2026-09-14', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 1500.0, 'price': 99.5683, 'value': 149352.45, 'is_buy': False}, {'transaction_date': '2026-09-14', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 2010.0, 'price': 100.7756, 'value': 202558.96, 'is_buy': False}, {'transaction_date': '2026-09-14', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 3143.0, 'price': 101.4919, 'value': 318989.04, 'is_buy': False}, {'transaction_date': '2026-09-14', 'insider_name': 'Atay Oguzhan', 'insider_title': 'Chairman and CEO, Director', 'transaction_type': 'Open-market sell', 'shares': 2666.0, 'price': 98.0, 'value': 261268.0, 'is_buy': False}, {'transaction_date': '2026-09-09', 'insider_name': 'ten Bosch John Roderick', 'insider_title': 'SVP of Laboratory Operations', 'transaction_type': 'Open-market sell', 'shares': 1416.0, 'price': 97.54, 'value': 138116.64, 'is_buy': False}, {'transaction_date': '2026-09-09', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 10000.0, 'price': 100.0, 'value': 1000000.0, 'is_buy': False}, {'transaction_date': '2026-09-08', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 1131.0, 'price': 100.33, 'value': 113473.23, 'is_buy': False}, {'transaction_date': '2026-09-08', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 147.0, 'price': 101.41, 'value': 14907.27, 'is_buy': False}, {'transaction_date': '2026-09-08', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 1944.0, 'price': 98.97, 'value': 192397.68, 'is_buy': False}, {'transaction_date': '2026-09-08', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 232.0, 'price': 100.92, 'value': 23413.44, 'is_buy': False}, {'transaction_date': '2026-09-08', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 2518.0, 'price': 100.2, 'value': 252303.6, 'is_buy': False}, {'transaction_date': '2026-09-08', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 2997.0, 'price': 100.11, 'value': 300029.67, 'is_buy': False}, {'transaction_date': '2026-09-08', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 358.0, 'price': 100.82, 'value': 36093.56, 'is_buy': False}, {'transaction_date': '2026-09-08', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 38.0, 'price': 96.47, 'value': 3665.86, 'is_buy': False}, {'transaction_date': '2026-09-08', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 385.0, 'price': 99.22, 'value': 38199.7, 'is_buy': False}, {'transaction_date': '2026-09-08', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 576.0, 'price': 98.89, 'value': 56960.64, 'is_buy': False}, {'transaction_date': '2026-09-08', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 614.0, 'price': 99.0, 'value': 60786.0, 'is_buy': False}, {'transaction_date': '2026-09-08', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 775.0, 'price': 100.83, 'value': 78143.25, 'is_buy': False}, {'transaction_date': '2026-09-08', 'insider_name': 'Lynch Thomas P.', 'insider_title': 'See Remarks', 'transaction_type': 'Open-market sell', 'shares': 8285.0, 'price': 100.12, 'value': 829494.2, 'is_buy': False}, {'transaction_date': '2026-08-25', 'insider_name': 'ten Bosch John Roderick', 'insider_title': 'SVP of Laboratory Operations', 'transaction_type': 'Open-market sell', 'shares': 1417.0, 'price': 100.0, 'value': 141700.0, 'is_buy': False}, {'transaction_date': '2026-08-25', 'insider_name': 'Tsao David', 'insider_title': 'Chief Technology Officer, Director', 'transaction_type': 'Open-market sell', 'shares': 10000.0, 'price': 100.0, 'value': 1000000.0, 'is_buy': False}] reported transactions plotted over the window rather than listed, so concentration is visible.

Not available for BLLN today: no reported open-market purchases in this window, so there is no insider cost basis to compute; no research case — nothing here has cleared the scoring threshold. Both appear on this page on their own if that changes.

A free account opens all of it.

Not financial advice. This page reports public filings and past research output. It is not a recommendation to buy or sell, and no price target here is a prediction. Trade at your own risk.