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Public disclosures only. Scores flag unusual patterns and are not evidence of wrongdoing. Not investment advice.

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01Overview02Follow the Money03Daily Brief04Live05Congress06Corporate Insiders07Government Money08Political Influence09Institutions10Washington Network11Follow the Power12Disclosure Clock13AI Investigator14Watchlist
ConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodologyMatch reviewLaunch readiness
OverviewFollow the MoneyDaily BriefLiveCongressCorporate InsidersGovernment MoneyPolitical InfluenceInstitutionsWashington NetworkFollow the PowerDisclosure ClockAI InvestigatorWatchlistConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodologyMatch reviewLaunch readiness
Data sources
SEC FORM 44h ago
HOUSE PTR4h ago
SEC 13F4h ago
ROBINHOOD CHAIN4h ago
SEC FORM 4/Open-market saleVerified dataRule 10b5-1 plan

Tsao David sold BLLN

Director, Chief Technology Officer · BillionToOne, Inc. · Class A Common Stock

Side
SELL
Value
$24K
Shares
230
Price
$104.47
Executed
Jun 15, 2026
Disclosed
Jun 17, 2026
Disclosure timeline2 days from execution to publication · legal deadline 2 business days
Jun 15 executedJun 17, 2026 disclosed

BLLN · daily

Yahoo Finance chart API
▲Execution▼Disclosure●Material company filing●Other disclosed buy●Other disclosed sellUnofficial public endpoint; daily OHLCV, split-adjusted. Replace with a licensed feed for production.

Insider Score

Experimental signal
20/ 100 · ROUTINE
Methodology →
  • Transaction type+6 / 20

    Open-market sale

  • Relative size+1 / 25

    $24K reported value · 2.0% of prior position

  • Filing timing0 / 15

    Disclosed 2 business days after execution (deadline: 2)

  • Historical behavior+8 / 15

    First recorded trade by this actor in this security

  • Frequency & clustering+15 / 15

    4 other actors traded the same direction within 14 days

  • Market events0 / 10

    No material company filing within 60 days after the trade

  • Pre-arranged plan-10

    Executed under a Rule 10b5-1 trading plan

    • The Insider Score measures how far a disclosure deviates from normal filing patterns. A high score is a prompt for research, not evidence of illegal insider trading.

    Other disclosed activity · BLLN

    ScoreActorSecuritySideValueExecutedDisclosedLagSourceEvidence
    15
    AO
    Atay OguzhanDirector, Chairman and CEO
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$60K
    536 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    12
    TD
    Tsao DavidDirector, Chief Technology Officer
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$23K
    208 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    0
    TD
    Tsao DavidDirector, Chief Technology Officer
    BLLNBillionToOne, Inc.
    Option exercise · 10b5-1 plan
    		M$28K
    10.0K sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    15
    TR
    ten Bosch John RoderickSVP of Laboratory Operations
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$160K
    1,417 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    8
    TD
    Tsao DavidDirector, Chief Technology Officer
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$11K
    100 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    19
    TD
    Tsao DavidDirector, Chief Technology Officer
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$70K
    633 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    8
    TD
    Tsao DavidDirector, Chief Technology Officer
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$2,603
    23 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    18
    TD
    Tsao DavidDirector, Chief Technology Officer
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$353K
    3,241 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    18
    TD
    Tsao DavidDirector, Chief Technology Officer
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$251K
    2,320 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    15
    TR
    ten Bosch John RoderickSVP of Laboratory Operations
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$160K
    1,417 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    15
    TD
    Tsao DavidDirector, Chief Technology Officer
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$219K
    1,992 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    8
    TD
    Tsao DavidDirector, Chief Technology Officer
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$34K
    300 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    22
    TD
    Tsao DavidDirector, Chief Technology Officer
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$266K
    2,450 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    22
    TD
    Tsao DavidDirector, Chief Technology Officer
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$353K
    3,234 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    0
    AO
    Atay OguzhanDirector, Chairman and CEO
    BLLNBillionToOne, Inc.
    Option exercise · 10b5-1 plan
    		M$23K
    8,334 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    15
    AO
    Atay OguzhanDirector, Chairman and CEO
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$105K
    974 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    0
    AO
    Atay OguzhanDirector, Chairman and CEO
    BLLNBillionToOne, Inc.
    Option exercise · 10b5-1 plan
    		M$47K
    16.7K sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    14
    AO
    Atay OguzhanDirector, Chairman and CEO
    BLLNBillionToOne, Inc.
    Open-market sale · 10b5-1 plan
    		SELL$302K
    2,667 sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    4
    TD
    Tsao DavidDirector, Chief Technology Officer
    BLLNBillionToOne, Inc.
    Option exercise · 10b5-1 plan
    		M$28K
    10.0K sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    4
    TD
    Tsao DavidDirector, Chief Technology Officer
    BLLNBillionToOne, Inc.
    Option exercise · 10b5-1 plan
    		M$28K
    10.0K sh
    		Nov 2, 2026Nov 4, 2026
    traded Nov 2, 2026
    		+2dSEC FORM 4

    Evidence

    Evidence

    Verified data

    Read directly from the primary public document; every field below is as reported by the filer.

    Source

    Document
    SEC Form 4
    Publisher
    U.S. Securities and Exchange Commission (EDGAR)
    Document ID
    0002087127-26-000002
    Machine-readable
    Structured copy

    Timestamps

    Event (reported)
    Jun 15, 2026
    Published
    Jun 17, 2026
    Ingested by INSIDER
    Nov 5, 03:52 UTC
    Last re-read
    Nov 5, 03:52 UTC

    Extracted facts

    Filer
    Tsao David
    Role
    Director, Chief Technology Officer
    Transaction
    Open-market saleAs filed: “S”
    Asset
    BillionToOne, Inc.
    Ticker
    BLLN
    Shares
    230
    Price per share
    $104.47
    Value
    $24,029
    Execution date (reported)
    Jun 15, 2026
    Owned after transaction
    11.0K shares
    Rule 10b5-1 plan
    Yes, as checked by the filer
    Days from execution to publication
    2

    Calculation

    Value = shares × reported price per share

    • Shares: 230
    • Price: $104.472

    = $24,029

    What this establishes

    Tsao David filed this Form 4 reporting a open-market sale of BLLN on Jun 15, 2026. It became public on Jun 17, 2026. The filing establishes the reported transaction and the filer's stated role. It does not establish why the trade was made or what the filer knew.

    Extraction

    Method
    Form 4 XML
    Confidence
    1.00
    Director, Chief Technology Officer
    Tsao Davidcik:0002087127
    Issuer
    BillionToOne, Inc.cik:0002070849

    Revision history · 0

    No field has changed since this record was first ingested.

    Company events

    No records

    No material filings recorded for this issuer.