David Tsao

CIK 2087127 · Chief Technology Officer · last filed 2026-07-15

David Tsao is a Chief Technology Officer who has filed 7 SEC Form 4 insider transactions across 1 company since 2026. The most recent filing, for BLLN, was dated Jul 15, 2026. Across all open-market trades the lifetime net is −$4.5M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $2.6M across reported positions.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

Disclosed Exposure

$2.61M

Companies

1

Total Filings

7

Lifetime Open-Market Net

-$4.54M

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.

Symbol	Role	Shares	Price	Disclosed Exposure	Lifetime OM Net	Filings	Latest Filed
BLLN	Chief Technology Officer	19,898	$131.19	$2.61M	-$4.54M	2	2026-07-15

Recent Filings

7 filings

Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.

Filed	Symbol	Action	Net Shares	Net $	Link
2026-07-15	BLLN	Mixed	—	-$2.44M	EDGAR
2026-07-13	BLLN	Notice (144)	−20,000	-$250.5K	EDGAR
2026-07-13	BLLN	Notice (144)	−3,500	-$439.1K	EDGAR
2026-06-17	BLLN	Mixed	—	-$1.99M	EDGAR
2026-06-15	BLLN	Notice (144)	−20,000	-$2.05M	EDGAR
2026-06-15	BLLN	Notice (144)	−3,500	-$355.1K	EDGAR
2025-11-12	—	Mixed	−2,324,108	$60.0K

Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.