InsiderSource
BLLN

BillionToOne, Inc.

SEC CIK 2070849
$99.96 +19.7% · 90 days
90-day buys
$0
0 open-market
90-day sells
$5.35M
18 open-market
Net insider flow
−$5.35M
Net selling
Filings shown
18
Most recent
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At a glance

Over the last 90 days, insiders at BLLN have sold a net $5.35M of stock (0 open-market buys vs 18 sells).

Largest recent trade: Atay Oguzhan sold $625K of BLLN, trimming their stake 100%.

Most active filer: Atay Oguzhan, with 9 transactions among the recent filings shown.

Insider transaction history

Form 4 filings for BLLN, newest first
View on SEC EDGAR ↗
BLLN
BillionToOne, Inc.
Sell Johnson Nancy JoAnn · See Remarks · Open-market sale · filed 3d ago ΔOwn −14%

Johnson Nancy Joann sold $463.2K of BLLN, trimming their stake 14%.

−$463.2K
4,666 sh @ $99
BLLN
BillionToOne, Inc.
Sell Johnson Nancy JoAnn · See Remarks · Open-market sale · filed 3d ago ΔOwn −9.7%

Johnson Nancy Joann sold $273.7K of BLLN, trimming their stake 10%.

−$273.7K
2,700 sh @ $101
BLLN
BillionToOne, Inc.
Sell Johnson Nancy JoAnn · See Remarks · Open-market sale · filed 3d ago ΔOwn −7.2%

Johnson Nancy Joann sold $185.8K of BLLN, trimming their stake 7%.

−$185.8K
1,816 sh @ $102
BLLN
BillionToOne, Inc.
Sell Johnson Nancy JoAnn · See Remarks · Open-market sale · filed 3d ago ΔOwn −6.0%

Johnson Nancy Joann sold $140.4K of BLLN, trimming their stake 6%.

−$140.4K
1,400 sh @ $100
BLLN
BillionToOne, Inc.
Sell Sakakibara Shan Riku · Chief Product Officer · Open-market sale · filed 3d ago ΔOwn −1.8%

Sakakibara Shan Riku sold $385.8K of BLLN, trimming their stake 2%.

−$385.8K
4,000 sh @ $96
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BLLN
BillionToOne, Inc.
Sell Sakakibara Shan Riku · Chief Product Officer · Open-market sale · filed 3d ago ΔOwn −1.9%

Sakakibara Shan Riku sold $400K of BLLN, trimming their stake 2%.

−$400K
4,000 sh @ $100
BLLN
BillionToOne, Inc.
Sell Johnson Nancy JoAnn · See Remarks · Open-market sale · filed 3d ago ΔOwn −8.1%

Johnson Nancy Joann sold $289.1K of BLLN, trimming their stake 8%.

−$289.1K
2,918 sh @ $99
BLLN
BillionToOne, Inc.
Sell Johnson Nancy JoAnn · See Remarks · Open-market sale · filed 3d ago ΔOwn −0.9%

Johnson Nancy Joann sold $30K of BLLN, trimming their stake 1%.

−$30K
300 sh @ $100
BLLN
BillionToOne, Inc.
Sell Johnson Nancy JoAnn · See Remarks · Open-market sale · filed 3d ago ΔOwn −0.6%

Johnson Nancy Joann sold $20.2K of BLLN, trimming their stake 1%.

−$20.2K
200 sh @ $101
BLLN
BillionToOne, Inc.
Sell Atay Oguzhan · Director, See Remarks · Open-market sale · filed 3d ago ΔOwn −0.3%

Atay Oguzhan sold $8K of BLLN.

−$8K
79 sh @ $101
BLLN
BillionToOne, Inc.
Sell Atay Oguzhan · Director, See Remarks · Open-market sale · filed 3d ago ΔOwn −21%

Atay Oguzhan sold $518K of BLLN, trimming their stake 21%.

−$518K
5,466 sh @ $95
BLLN
BillionToOne, Inc.
Sell Atay Oguzhan · Director, See Remarks · Open-market sale · filed 3d ago ΔOwn −9.0%

Atay Oguzhan sold $177.4K of BLLN, trimming their stake 9%.

−$177.4K
1,856 sh @ $96
BLLN
BillionToOne, Inc.
Sell Atay Oguzhan · Director, See Remarks · Open-market sale · filed 3d ago ΔOwn −23%

Atay Oguzhan sold $423.6K of BLLN, trimming their stake 23%.

−$423.6K
4,372 sh @ $97
BLLN
BillionToOne, Inc.
Sell Atay Oguzhan · Director, See Remarks · Open-market sale · filed 3d ago ΔOwn −28%

Atay Oguzhan sold $399K of BLLN, trimming their stake 28%.

−$399K
4,066 sh @ $98
BLLN
BillionToOne, Inc.
Sell Atay Oguzhan · Director, See Remarks · Open-market sale · filed 3d ago ΔOwn −35%

Atay Oguzhan sold $357.1K of BLLN, trimming their stake 35%.

−$357.1K
3,605 sh @ $99
BLLN
BillionToOne, Inc.
Sell Atay Oguzhan · Director, See Remarks · Open-market sale · filed 3d ago ΔOwn −8.2%

Atay Oguzhan sold $55.6K of BLLN, trimming their stake 8%.

−$55.6K
556 sh @ $100
BLLN
BillionToOne, Inc.
Sell Atay Oguzhan · Director, See Remarks · Open-market sale · filed 3d ago ΔOwn −100%

Atay Oguzhan sold $625K of BLLN, trimming their stake 100%.

−$625K
6,250 sh @ $100
BLLN
BillionToOne, Inc.
Sell Atay Oguzhan · Director, See Remarks · Open-market sale · filed 3d ago ΔOwn −3.1%

Atay Oguzhan sold $602.8K of BLLN, trimming their stake 3%.

−$602.8K
6,250 sh @ $96
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About BLLN insider activity

This page tracks every recent Form 4 filed for BillionToOne, Inc. with the U.S. Securities and Exchange Commission. Form 4 is the disclosure that company insiders — officers, directors, and holders of more than 10% of the stock — must file within two business days of buying or selling shares.

The summary above nets open-market purchases against open-market sales over the trailing 90 days. Open-market trades (codes P and S) tend to carry the most signal because they reflect a deliberate choice to put money in or take it out, as opposed to routine grants, option exercises, or tax-withholding events. Use the badges on each row to tell them apart, and always confirm details against the original filing before drawing conclusions.

Frequently asked questions

How often is BLLN insider data updated?

Continuously. We read from SEC EDGAR, so new Form 4 filings for BillionToOne, Inc. usually appear here within minutes of being accepted by the SEC.

What does "net insider flow" mean?

It is the total dollar value of open-market insider purchases minus open-market sales over the last 90 days. A positive number (green) means insiders bought more than they sold; a negative number (red) means the reverse.

Why do some rows show grants or option exercises instead of buys?

Insiders receive stock through compensation as well as buying it outright. Form 4 captures all of these. We label each transaction by its SEC code so you can focus on open-market activity if you prefer.

Is this investment advice?

No. InsiderSource presents public filing data for informational purposes only. Insider activity is one of many factors to consider and is never a recommendation to buy or sell.