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Data sources

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

Robinhood Chain…
OverviewFollow the MoneyDaily BriefLiveCongressDirectoryCorporate InsidersGovernment MoneyPolitical InfluenceInstitutionsWashington NetworkFollow the PowerDisclosure ClockAI InvestigatorWatchlistConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodology
OverviewFollow the MoneyDaily BriefLiveCongressDirectoryCorporate InsidersGovernment MoneyPolitical InfluenceInstitutionsWashington NetworkFollow the PowerDisclosure ClockAI InvestigatorWatchlist
ConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodology
OverviewFollow the MoneyDaily BriefLiveCongressDirectoryCorporate InsidersGovernment MoneyPolitical InfluenceInstitutionsWashington NetworkFollow the PowerDisclosure ClockAI InvestigatorWatchlistConvergenceINSIDER AlphaSignal ledgerHistorical ReplayRobinhood ChainProofTradingTokenProAccountMethodology
Data sources
SEC FORM 447m ago
HOUSE PTR46m ago
SEC 13F46m ago
ROBINHOOD CHAIN46m ago
TD
Corporate insider

Tsao David

Director, Chief Technology OfficerCIK 0002087127

EDGAR filingsOpen in network
Disclosed transactions60
Buys / sells0 / 37
Max Insider Score35
Connections with evidence1

Disclosed transactions

ScoreActorSecuritySideValueExecutedDisclosedLagSourceEvidence
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

Verified connections

  • Insider ofevidence
    BillionToOne, Inc.Director, Chief Technology Officer · Jun 17, 2026
19
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL
$70K
633 sh
Nov 2, 2026
Nov 4, 2026
traded Nov 2, 2026
+2d
SEC 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

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

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

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

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

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

11
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$98K
917 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

15
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$114K
1,063 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$125K
1,130 sh
Nov 2, 2026Nov 4, 2026
traded Nov 2, 2026
+2dSEC FORM 4

Evidence

26
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$264K
2,389 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

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

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

0
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

15
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$205K
1,909 sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

22
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$464K
4,284 sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

8
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$42K
400 sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

19
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$236K
2,200 sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

26
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$534K
4,916 sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

12
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$11K
100 sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

0
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

4
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

4
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

22
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$318K
2,921 sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

8
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$2,202
20 sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

15
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$59K
555 sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

23
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$200K
1,829 sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

11
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$92K
866 sh
Oct 5, 2026Oct 7, 2026
traded Oct 5, 2026
+2dSEC FORM 4

Evidence

4
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$9,332
3,333 sh
Sep 24, 2026Sep 28, 2026
traded Sep 24, 2026
+4dSEC FORM 4

Evidence

0
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$9,332
3,333 sh
Sep 24, 2026Sep 28, 2026
traded Sep 24, 2026
+4dSEC FORM 4

Evidence

31
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$417K
3,333 sh
Sep 24, 2026Sep 28, 2026
traded Sep 24, 2026
+4dSEC FORM 4

Evidence

27
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$975K
10.0K sh
Sep 9, 2026Sep 11, 2026
traded Sep 9, 2026
+2dSEC FORM 4

Evidence

4
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Sep 9, 2026Sep 11, 2026
traded Sep 9, 2026
+2dSEC FORM 4

Evidence

4
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Sep 9, 2026Sep 11, 2026
traded Sep 9, 2026
+2dSEC FORM 4

Evidence

0
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Sep 9, 2026Sep 11, 2026
traded Sep 9, 2026
+2dSEC FORM 4

Evidence

34
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$1.00M
10.0K sh
Sep 9, 2026Sep 11, 2026
traded Sep 9, 2026
+2dSEC FORM 4

Evidence

0
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Sep 9, 2026Sep 11, 2026
traded Sep 9, 2026
+2dSEC FORM 4

Evidence

20
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Derivative conversion
C—
20.0K sh
Sep 3, 2026Sep 8, 2026
traded Sep 3, 2026
+5dSEC FORM 4

Evidence

5
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Gift
G—
20.0K sh
Sep 8, 2026Sep 8, 2026
traded Sep 8, 2026
+0dSEC FORM 4

Evidence

8
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Derivative conversion
C—
20.0K sh
Sep 3, 2026Sep 8, 2026
traded Sep 3, 2026
+5dSEC FORM 4

Evidence

4
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Aug 25, 2026Aug 27, 2026
traded Aug 25, 2026
+2dSEC FORM 4

Evidence

0
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Aug 25, 2026Aug 27, 2026
traded Aug 25, 2026
+2dSEC FORM 4

Evidence

29
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$1.00M
10.0K sh
Aug 25, 2026Aug 27, 2026
traded Aug 25, 2026
+2dSEC FORM 4

Evidence

26
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$929K
10.0K sh
Aug 10, 2026Aug 12, 2026
traded Aug 10, 2026
+2dSEC FORM 4

Evidence

0
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Aug 10, 2026Aug 12, 2026
traded Aug 10, 2026
+2dSEC FORM 4

Evidence

4
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Aug 10, 2026Aug 12, 2026
traded Aug 10, 2026
+2dSEC FORM 4

Evidence

0
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Jun 15, 2026Jun 17, 2026
traded Jun 15, 2026
+2dSEC FORM 4

Evidence

27
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$171K
1,704 sh
Jun 15, 2026Jun 17, 2026
traded Jun 15, 2026
+2dSEC FORM 4

Evidence

27
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$59K
600 sh
Jun 15, 2026Jun 17, 2026
traded Jun 15, 2026
+2dSEC FORM 4

Evidence

0
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Option exercise · 10b5-1 plan
M$28K
10.0K sh
Jun 15, 2026Jun 17, 2026
traded Jun 15, 2026
+2dSEC FORM 4

Evidence

31
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$59K
563 sh
Jun 15, 2026Jun 17, 2026
traded Jun 15, 2026
+2dSEC FORM 4

Evidence

35
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$249K
2,398 sh
Jun 15, 2026Jun 17, 2026
traded Jun 15, 2026
+2dSEC FORM 4

Evidence

34
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$300K
2,889 sh
Jun 15, 2026Jun 17, 2026
traded Jun 15, 2026
+2dSEC FORM 4

Evidence

30
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$289K
2,816 sh
Jun 15, 2026Jun 17, 2026
traded Jun 15, 2026
+2dSEC FORM 4

Evidence

27
TD
Tsao DavidDirector, Chief Technology Officer
BLLNBillionToOne, Inc.
Open-market sale · 10b5-1 plan
SELL$240K
2,361 sh
Jun 15, 2026Jun 17, 2026
traded Jun 15, 2026
+2dSEC FORM 4

Evidence