Chang John B.

Form 4 filings across 1 company. Net figures count open-market buys and sales only. EDGAR profile ↗

Lifetime net: $0

Positions by company

Reported holding is the most recent post-transaction share count on a Table I row.

Every company this insider has reported trading in, with the value bought and sold at each and the date they last traded.
Ticker	Company	Bought	Sold	Net	Shares held	Last trade
CCOI	Cogent Communications Holdings, INC.	$0	$0	$0	188,847	Dec 31, 2025

CCOI

Cogent Communications…

Bought

Sold

Held

188,847

Filing record

How quickly this filer reports. Section 16 allows two business days from the transaction.

All 5 filings we hold were filed within the two-business-day deadline.

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Trade history

The 7 most recent Form 4 transactions.

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Ticker	Company	Type	Shares	Price	Value	Δ Own	Filing
Dec 31, 2025	CCOI	Cogent Communications…	AGRANT	100,000	—	—	+112.5%	Open the original filing on SEC.gov
Dec 31, 2025	CCOI	Cogent Communications…	AGRANT	9,600	—	—	+12.1%	Open the original filing on SEC.gov