BillionToOne, Inc. (BLLN) Insider Trading

Last 12 months

Insiders bought $3.18M and sold $51.3M on the open market.

All of the selling was scheduled in advance under 10b5-1 plans.

Net open-market

−$48.2M

6 buys · 34 sales

Under a 10b5-1 plan

100%

of the value sold

Insiders who bought / sold

6 / 6

executives and directors

Last open-market buy

Nov 2025

Nov 7, 2025

Get an email when BLLN's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Oct 14 – 15	Oguzhan Atay Chairman and CEO	Sold10b5-1 plan 8 parts	11,000	$99.14 average	$1.09M	6.9%	Form 4
Oct 12	Oguzhan Atay Chairman and CEO	Sold10b5-1 plan 6 parts	19,334	$94.31 average	$1.82M	11%	Form 4
Oct 5	Bosch John Roderick Ten SVP of Laboratory Operations	Sold10b5-1 plan 2 parts	2,834	$105.15 average	$298k	13%	Form 4
Oct 5	David Tsao Chief Technology Officer	Sold10b5-1 plan 11 parts	20,000	$108.15 average	$2.16M	95%	Form 4
Sep 28	Oguzhan Atay Chairman and CEO	Sold10b5-1 plan 2 parts	10,999	$120.64 average	$1.33M	6.6%	Form 4
Sep 24	David Tsao Chief Technology Officer	Sold10b5-1 plan	3,333	$125.00	$417k	77%	Form 4
Sep 24	Bosch John Roderick Ten SVP of Laboratory Operations	Sold10b5-1 plan	1,416	$120.00	$170k	6.0%	Form 4
Sep 21	Bosch John Roderick Ten SVP of Laboratory Operations	Sold10b5-1 plan	1,416	$106.61	$151k	5.7%	Form 4
Sep 17	Thomas P. Lynch See Remarks	Sold10b5-1 plan 4 parts	35,112	$110.33 average	$3.87M	98%	Form 4
Sep 14	Oguzhan Atay Chairman and CEO	Sold10b5-1 plan 10 parts	30,331	$99.91 average	$3.03M	16%	Form 4
Sep 9	David Tsao Chief Technology Officer	Sold10b5-1 plan 2 parts	20,000	$98.77 average	$1.98M	95%	Form 4
Sep 9	Bosch John Roderick Ten SVP of Laboratory Operations	Sold10b5-1 plan	1,416	$97.54	$138k	5.4%	Form 4
Sep 8	Thomas P. Lynch See Remarks	Sold10b5-1 plan 13 parts	20,000	$99.99 average	$2M	97%	Form 4
Aug 25	David Tsao Chief Technology Officer	Sold10b5-1 plan	10,000	$100.00	$1M	91%	Form 4
Aug 25	Bosch John Roderick Ten SVP of Laboratory Operations	Sold10b5-1 plan	1,417	$100.00	$142k	5.1%	Form 4
Aug 10	Bosch John Roderick Ten SVP of Laboratory Operations	Sold10b5-1 plan	1,417	$92.86	$132k	4.8%	Form 4
Aug 10	David Tsao Chief Technology Officer	Sold10b5-1 plan	10,000	$92.86	$929k	91%	Form 4
Aug 5	Oguzhan Atay Chairman and CEO	Sold10b5-1 plan	15,539	$150.03	$2.33M	100%	Form 4
Aug 3	Oguzhan Atay Chairman and CEO	Sold10b5-1 plan 23 parts	45,000	$137.07 average	$6.17M	22%	Form 4
Jul 31	Shan Riku Sakakibara Chief Product Officer	Sold10b5-1 plan	4,000	$140.21	$561k	2.0%	Form 4
Jul 16	Nancy Joann Johnson See Remarks	Sold10b5-1 plan 4 parts	14,199	$128.30 average	$1.82M	67%	Form 4
Jul 13	David Tsao Chief Technology Officer	Sold10b5-1 plan 10 parts	20,000	$124.89 average	$2.5M	95%	Form 4
Jul 13	Bosch John Roderick Ten SVP of Laboratory Operations	Sold10b5-1 plan 3 parts	4,251	$125.46 average	$533k	13%	Form 4
Jul 9	Oguzhan Atay Chairman and CEO	Sold10b5-1 plan 4 parts	12,500	$126.10 average	$1.58M	100%	Form 4
Jul 9	Shan Riku Sakakibara Chief Product Officer	Sold10b5-1 plan 5 parts	8,000	$125.00 average	$1M	3.8%	Form 4
Jul 6	Oguzhan Atay Chairman and CEO	Sold10b5-1 plan 28 parts	38,750	$122.05 average	$4.73M	18%	Form 4
Jul 1	Nancy Joann Johnson See Remarks	Sold10b5-1 plan	801	$124.91	$100k	3.7%	Form 4
Jun 29	Bosch John Roderick Ten SVP of Laboratory Operations	Sold10b5-1 plan	1,416	$120.00	$170k	4.0%	Form 4
Jun 24	Shan Riku Sakakibara Chief Product Officer	Sold10b5-1 plan 2 parts	8,000	$110.00 average	$880k	3.7%	Form 4
Jun 15	David Tsao Chief Technology Officer	Sold10b5-1 plan 11 parts	20,000	$102.26 average	$2.05M	95%	Form 4
Jun 15	Bosch John Roderick Ten See Remarks	Sold10b5-1 plan 2 parts	2,832	$101.47 average	$287k	7.5%	Form 4
Jun 8 – 9	Nancy Joann Johnson See Remarks	Sold10b5-1 plan 7 parts	14,000	$100.18 average	$1.4M	39%	Form 4
Jun 8	Oguzhan Atay See Remarks	Sold10b5-1 plan 10 parts	38,750	$97.84 average	$3.79M	17%	Form 4
Jun 8	Shan Riku Sakakibara Chief Product Officer	Sold10b5-1 plan 2 parts	8,000	$98.23 average	$786k	3.6%	Form 4
Nov 7, 2025	Thomas P. Lynch See Remarks	Bought	100	$60.00	$6k	17%	Form 4
Nov 7, 2025	David Tsao Chief Technology Officer	Bought	1,000	$60.00	$60k	New	Form 4
Nov 7, 2025	Bosch John Roderick Ten See Remarks	Bought	800	$60.00	$48k	2.2%	Form 4
Nov 7, 2025	Nancy Joann Johnson See Remarks	Bought	6,900	$60.00	$414k	24%	Form 4
Nov 7, 2025	Akshay Rai Director	Bought	2,500	$60.00	$150k	0.1%	Form 4
Nov 7, 2025	Thomas S Bremner Director	Bought 6 parts	41,666	$60.00 average	$2.5M	5.0%	Form 4

Oct 14 – 1510b5-1 plan
Oguzhan Atay
Chairman and CEO · sold 11,000 at avg $99.14
$1.09M
6.9% of stake
Oct 1210b5-1 plan
Oguzhan Atay
Chairman and CEO · sold 19,334 at avg $94.31
$1.82M
11% of stake
Oct 510b5-1 plan
Bosch John Roderick Ten
SVP of Laboratory Operations · sold 2,834 at avg $105.15
$298k
13% of stake
Oct 510b5-1 plan
David Tsao
Chief Technology Officer · sold 20,000 at avg $108.15
$2.16M
95% of stake
Sep 2810b5-1 plan
Oguzhan Atay
Chairman and CEO · sold 10,999 at avg $120.64
$1.33M
6.6% of stake
Sep 2410b5-1 plan
David Tsao
Chief Technology Officer · sold 3,333 at $125.00
$417k
77% of stake
Sep 2410b5-1 plan
Bosch John Roderick Ten
SVP of Laboratory Operations · sold 1,416 at $120.00
$170k
6.0% of stake
Sep 2110b5-1 plan
Bosch John Roderick Ten
SVP of Laboratory Operations · sold 1,416 at $106.61
$151k
5.7% of stake
Sep 1710b5-1 plan
Thomas P. Lynch
See Remarks · sold 35,112 at avg $110.33
$3.87M
98% of stake
Sep 1410b5-1 plan
Oguzhan Atay
Chairman and CEO · sold 30,331 at avg $99.91
$3.03M
16% of stake
Sep 910b5-1 plan
David Tsao
Chief Technology Officer · sold 20,000 at avg $98.77
$1.98M
95% of stake
Sep 910b5-1 plan
Bosch John Roderick Ten
SVP of Laboratory Operations · sold 1,416 at $97.54
$138k
5.4% of stake
Sep 810b5-1 plan
Thomas P. Lynch
See Remarks · sold 20,000 at avg $99.99
$2M
97% of stake
Aug 2510b5-1 plan
David Tsao
Chief Technology Officer · sold 10,000 at $100.00
$1M
91% of stake
Aug 2510b5-1 plan
Bosch John Roderick Ten
SVP of Laboratory Operations · sold 1,417 at $100.00
$142k
5.1% of stake
Aug 1010b5-1 plan
Bosch John Roderick Ten
SVP of Laboratory Operations · sold 1,417 at $92.86
$132k
4.8% of stake
Aug 1010b5-1 plan
David Tsao
Chief Technology Officer · sold 10,000 at $92.86
$929k
91% of stake
Aug 510b5-1 plan
Oguzhan Atay
Chairman and CEO · sold 15,539 at $150.03
$2.33M
100% of stake
Aug 310b5-1 plan
Oguzhan Atay
Chairman and CEO · sold 45,000 at avg $137.07
$6.17M
22% of stake
Jul 3110b5-1 plan
Shan Riku Sakakibara
Chief Product Officer · sold 4,000 at $140.21
$561k
2.0% of stake
Jul 1610b5-1 plan
Nancy Joann Johnson
See Remarks · sold 14,199 at avg $128.30
$1.82M
67% of stake
Jul 1310b5-1 plan
David Tsao
Chief Technology Officer · sold 20,000 at avg $124.89
$2.5M
95% of stake
Jul 1310b5-1 plan
Bosch John Roderick Ten
SVP of Laboratory Operations · sold 4,251 at avg $125.46
$533k
13% of stake
Jul 910b5-1 plan
Oguzhan Atay
Chairman and CEO · sold 12,500 at avg $126.10
$1.58M
100% of stake
Jul 910b5-1 plan
Shan Riku Sakakibara
Chief Product Officer · sold 8,000 at avg $125.00
$1M
3.8% of stake
Jul 610b5-1 plan
Oguzhan Atay
Chairman and CEO · sold 38,750 at avg $122.05
$4.73M
18% of stake
Jul 110b5-1 plan
Nancy Joann Johnson
See Remarks · sold 801 at $124.91
$100k
3.7% of stake
Jun 2910b5-1 plan
Bosch John Roderick Ten
SVP of Laboratory Operations · sold 1,416 at $120.00
$170k
4.0% of stake
Jun 2410b5-1 plan
Shan Riku Sakakibara
Chief Product Officer · sold 8,000 at avg $110.00
$880k
3.7% of stake
Jun 1510b5-1 plan
David Tsao
Chief Technology Officer · sold 20,000 at avg $102.26
$2.05M
95% of stake
Jun 1510b5-1 plan
Bosch John Roderick Ten
See Remarks · sold 2,832 at avg $101.47
$287k
7.5% of stake
Jun 8 – 910b5-1 plan
Nancy Joann Johnson
See Remarks · sold 14,000 at avg $100.18
$1.4M
39% of stake
Jun 810b5-1 plan
Oguzhan Atay
See Remarks · sold 38,750 at avg $97.84
$3.79M
17% of stake
Jun 810b5-1 plan
Shan Riku Sakakibara
Chief Product Officer · sold 8,000 at avg $98.23
$786k
3.6% of stake
Nov 7, 2025
Thomas P. Lynch
See Remarks · bought 100 at $60.00
$6k
17% of stake
Nov 7, 2025
David Tsao
Chief Technology Officer · bought 1,000 at $60.00
$60k
New position
Nov 7, 2025
Bosch John Roderick Ten
See Remarks · bought 800 at $60.00
$48k
2.2% of stake
Nov 7, 2025
Nancy Joann Johnson
See Remarks · bought 6,900 at $60.00
$414k
24% of stake
Nov 7, 2025
Akshay Rai
Director · bought 2,500 at $60.00
$150k
0.1% of stake
Nov 7, 2025
Thomas S Bremner
Director · bought 41,666 at avg $60.00
$2.5M
5.0% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch BLLN, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in BLLN's SEC filings or

Download this analysis as a PDF (Pro)

Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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