Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

BillionToOne, Inc.

BLLN · Nasdaq · CIK 0002070849 · Healthcare · Diagnostics & Research

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

264 Form 4 transaction lines observed in the same window
167 sales · 97 option, withholding, award, gift or other lines

Last qualifying purchase2025-11-07 · Lynch Thomas P. · $6.0K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesHigh
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Atay OguzhanChairman and CEO
○▼○▼○▼○▼○○○▼○▼○▼○▼○▼
Tsao DavidChief Technology Officer
○▼○▼○▼○○○▼○▼○▼
ten Bosch John RoderickSVP of Laboratory Operations
▼▼▼▼▼▼▼▼
Lynch Thomas P.See Remarks
○▼○▼○
Sakakibara Shan RikuChief Product Officer
▼○▼▼○
Johnson Nancy JoAnnSee Remarks
▼▼
● Purchase▼ Sale○ Other

Showing the six most active owners; 1 additional owner(s) remain in Form 4 evidence.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2025-11-07 · Lynch Thomas P..

Recent Form 4 activity

11Purchases
167Sales
202Other Form 4 lines
62SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING167 sale line(s) · context only
OTHER97 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
2,818,267
Previous report
2,625,520
Avg daily volume
725,773
Days to cover
3.9

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2025-11-07ten Bosch John RoderickPurchase (P)Class A Common Stock800USD 60.00USD 48,000SEC filing ↗
2025-11-07Tsao DavidPurchase (P)Class A Common Stock1,000USD 60.00USD 60,000SEC filing ↗
2025-11-07Rai AkshayPurchase (P)Class A Common Stock2,500USD 60.00USD 150,000SEC filing ↗
2025-11-07Lynch Thomas P.Purchase (P)Class A Common Stock100USD 60.00USD 6,000SEC filing ↗
2025-11-07Johnson Nancy JoAnnPurchase (P)Class A Common Stock6,900USD 60.00USD 414,000SEC filing ↗
2025-11-07Bremner Thomas SPurchase (P)Class A Common Stock41,666USD 60.00USD 2,499,960SEC filing ↗

Form 4 evidence

380 transaction lines in the latest 365-day window; 380 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-15Atay OguzhanSale (S)Class A Common Stock5,150USD 100.23USD 516,189SEC filing ↗
2026-10-15Atay OguzhanOption exercise / conversion (M)Class A Common Stock5,150USD 2.80USD 14,420SEC filing ↗
2026-10-14Atay OguzhanSale (S)Class A Common Stock5,850USD 98.19USD 574,386SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-15Atay OguzhanSale (S)Class A Common Stock5,150USD 100.23USD 516,189SEC filing ↗
2026-10-15Atay OguzhanOption exercise / conversion (M)Class A Common Stock5,150USD 2.80USD 14,420SEC filing ↗
2026-10-14Atay OguzhanSale (S)Class A Common Stock5,850USD 98.19USD 574,386SEC filing ↗
2026-10-14Atay OguzhanOption exercise / conversion (M)Class A Common Stock3,183USD 2.80USD 8,912SEC filing ↗
2026-10-12Atay OguzhanSale (S)Class A Common Stock19,334USD 94.31USD 1,823,450SEC filing ↗
2026-10-12Atay OguzhanOption exercise / conversion (M)Class A Common Stock16,667USD 2.80USD 46,668SEC filing ↗
2026-10-08Lynch Thomas P.Option exercise / conversion (M)Class A Common Stock8,000USD 8.65USD 69,200SEC filing ↗
2026-10-05ten Bosch John RoderickSale (S)Class A Common Stock1,417USD 105.15USD 148,998SEC filing ↗
2026-10-05Tsao DavidSale (S)Class A Common Stock20,000USD 108.15USD 2,162,950SEC filing ↗
2026-10-05Tsao DavidOption exercise / conversion (M)Class A Common Stock10,000USD 2.80USD 28,000SEC filing ↗
2026-09-28Atay OguzhanSale (S)Class A Common Stock10,999USD 120.64USD 1,326,919SEC filing ↗
2026-09-28Atay OguzhanOption exercise / conversion (M)Class A Common Stock8,333USD 2.80USD 23,332SEC filing ↗
2026-09-24ten Bosch John RoderickSale (S)Class A Common Stock1,416USD 120.00USD 169,920SEC filing ↗
2026-09-24Tsao DavidSale (S)Class A Common Stock3,333USD 125.00USD 416,625SEC filing ↗
2026-09-24Tsao DavidOption exercise / conversion (M)Class A Common Stock3,333USD 2.80USD 9,332SEC filing ↗
2026-09-21ten Bosch John RoderickSale (S)Class A Common Stock1,416USD 106.61USD 150,960SEC filing ↗
2026-09-17Lynch Thomas P.Sale (S)Class A Common Stock35,112USD 110.33USD 3,873,987SEC filing ↗
2026-09-17Lynch Thomas P.Option exercise / conversion (M)Class A Common Stock35,112USD 13.61USD 477,898SEC filing ↗
2026-09-14Atay OguzhanSale (S)Class A Common Stock27,665USD 100.10USD 2,769,172SEC filing ↗
2026-09-14Atay OguzhanOption exercise / conversion (M)Class A Common Stock24,999USD 2.80USD 69,997SEC filing ↗
2026-09-10Sakakibara Shan RikuGift (G)Class A Common Stock3,500USD 0.00USD 0SEC filing ↗
2026-09-09ten Bosch John RoderickSale (S)Class A Common Stock1,416USD 97.54USD 138,117SEC filing ↗
2026-09-09Tsao DavidSale (S)Class A Common Stock20,000USD 98.77USD 1,975,400SEC filing ↗
2026-09-09Tsao DavidOption exercise / conversion (M)Class A Common Stock10,000USD 2.80USD 28,000SEC filing ↗
2026-09-09Atay OguzhanGift (G)Class A Common Stock20,000USD 0.00USD 0SEC filing ↗
2026-09-08Lynch Thomas P.Sale (S)Class A Common Stock20,000USD 99.99USD 1,999,868SEC filing ↗
2026-09-08Lynch Thomas P.Option exercise / conversion (M)Class A Common Stock20,000USD 13.61USD 272,200SEC filing ↗
2026-09-08Atay OguzhanC (C)Class A Common Stock20,000USD 0.00USD 0SEC filing ↗
2026-09-08Tsao DavidGift (G)Class A Common Stock20,000USD 0.00USD 0SEC filing ↗
2026-09-03Tsao DavidC (C)Class A Common Stock20,000USD 0.00USD 0SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerBLLN
CIK0002070849
SectorHealthcare
IndustryDiagnostics & Research Yahoo Finance
SEC SIC8071 Services-Medical Laboratories
ExchangeNasdaq

Data coverage

Local Form 4 history380 transaction lines from 2025-11-06 to 2026-10-15
11 P purchase lines · 167 S sale lines · 202 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.