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Insider

David Tsao

Chief Technology Officer

David Tsao (Chief Technology Officer) filed 5 Form 4 reports in the trailing twelve months (0 purchases, 5 sales), most often in BillionToOne, Inc. (BLLN). The largest single filing was $2.5M of BLLN (20,000 sh across 10 lots, as filed), executed Jul 13.

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Return, ttmiAverage return per filing, trailing twelve months
no purchases on file
Delay-adjustediThe same average, entered at disclosure dates
returns measure stock purchases only
Filings, ttm
5
0 buys · 5 sells
Median delay
execution → disclosure
Volume, ttmiDollar value disclosed in the trailing twelve months
$8.3M
shares × price, as filed
Last traded
Sep 9
Filed Sep 11

Median ADV $67.2M across their filed names

Open performance
Volume by month
$2.5M$1.2M$0Oct 2024Apr 2025Oct 2025Apr 2026Jun 2026 · sells $1.9MJul 2026 · sells $2.5MAug 2026 · sells $1.9MSep 2026 · sells $2.0M
Buys $0 Sells $8.3M

Shares × price, as filed · by filing month · past 24 months

Sectors filed on
Healthcare 5 filings

Sector per market data · by filing · past 12 months

Most traded names
BLLN BillionToOne, Inc. BLLN · 0 buys · 5 sells 5 filings
Recent filings
BLLNSALE BillionToOne, Inc. View filing → $2.0M
20,000 sh across 2 lots
Exec Sep 9
Filed Sep 11 · 6:01 PM ET
BLLNSALE BillionToOne, Inc. View filing → $1.0M
10,000 sh × $100.00
Exec Aug 25
Filed Aug 27 · 8:19 PM ET
BLLNSALE BillionToOne, Inc. View filing → $929K
10,000 sh × $92.86
Exec Aug 10
Filed Aug 12 · 6:51 PM ET
BLLNSALE BillionToOne, Inc. View filing → $2.5M
20,000 sh across 10 lots
Exec Jul 13
Filed Jul 15 · 4:38 PM ET
BLLNSALE BillionToOne, Inc. View filing → $1.9M
18,607 sh across 8 lots
Exec Jun 15
Filed Jun 17 · 5:30 PM ET