Who are the insiders buying BillionToOne, Inc. stock?

InsiderAct tracks all open-market purchases of BillionToOne, Inc. stock by corporate insiders — including officers, directors, and shareholders owning more than 10% — sourced from public SEC Form 4 filings.

What does insider buying at a company mean?

When a corporate officer, director, or major shareholder purchases their own company's stock on the open market using personal funds, it signals confidence in the company's outlook. This is especially meaningful when multiple insiders buy within the same 7–14 day window (cluster buying) or when the purchase size exceeds $100,000.

How do I find cluster buying signals for a company?

InsiderAct automatically detects cluster buying — two or more insiders independently purchasing shares within a 14-day window. When a cluster buy signal is active for a company, it appears prominently on the company's InsiderAct page and on the Signals tab.

Has BillionToOne, Inc. had any recent large insider purchases?

InsiderAct tracks all open-market purchases of $100,000 or more at BillionToOne, Inc.. Large insider purchases are flagged as high-conviction signals because they represent meaningful personal capital commitments by executives or directors who have direct visibility into the company's operations and prospects.

Where do the insider transactions on this page come from?

All transactions shown on InsiderAct company pages are sourced directly from SEC EDGAR Form 4 filings — the mandatory public disclosures that corporate insiders must submit within 2 business days of any stock transaction. InsiderAct ingests these filings in near real time and filters for open-market purchases and sales.

BLLN

Billiontoone, Inc.

$127.98+1.90 (1.51%)

Price

MA20

▲Insider buy

▼Insider sell

Loading chart...

Insider Activity

80 of 326 trades

Executives investing their own money

246+ more trades

See RemarksSale

$289.14K

-2,918 shares @ $99.09

Johnson Nancy JoAnn

Jun 8, 2026

See RemarksSale

$30.02K

-300 shares @ $100.05

Johnson Nancy JoAnn

Jun 8, 2026

See RemarksSale

$20.2K

-200 shares @ $100.98

Johnson Nancy JoAnn

Jun 8, 2026

CPOSale

$385.8K

-4,000 shares @ $96.45

Sakakibara Shan Riku

Jun 8, 2026

CPOSale

$400K

-4,000 shares @ $100.00

Sakakibara Shan Riku

Jun 8, 2026

See RemarksSale

$602.81K

-6,250 shares @ $96.45

								1WStock price change 1 week after insider bought. Small number below shows return vs S&P 500.	1MStock price change 1 month after insider bought.
2026-07-20	2026-07-16	Johnson Nancy Joann	See Remarks	Sale	5,601	$128.96	$722,277	N/A	N/A
2026-07-20	2026-07-16	Johnson Nancy Joann	See Remarks	Sale	5,559	$127.89	$710,918	N/A	N/A
2026-07-20	2026-07-16	Johnson Nancy Joann	See Remarks	Sale	2,133	$126.98	$270,853	N/A	N/A
2026-07-20	2026-07-16	Johnson Nancy Joann	See Remarks	Sale	906	$129.78	$117,580	N/A	N/A
2026-07-15	2026-07-13	Ten Bosch John Roderick	SVP	Sale	1,417	$125.46	$177,777	N/A	N/A
2026-07-15	2026-07-13	Tsao David	CTO	Exercise Conversion	10,000	$2.80	$28,000	N/A	N/A
2026-07-15	2026-07-13	Tsao David	CTO	Sale	3,835	$125.76	$482,286	N/A	N/A
2026-07-15	2026-07-13	Tsao David	CTO	Sale	3,185	$125.85	$400,820	N/A	N/A
2026-07-15	2026-07-13	Tsao David	CTO	Sale	2,477	$123.84	$306,762	N/A	N/A
2026-07-15	2026-07-13	Tsao David	CTO	Sale	2,415	$124.90	$301,634	N/A	N/A

BLLN

Insider Activity

Latest Insider Transactions

Want to see more transactions?