Insiders who reported open-market trades in the last 12 months at the companies John B. Chang files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
John B. Chang is a corporate insider, tracked as VP & CHIEF LEGAL OFFICER of COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI). InsiderAlpha holds 8 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did John B. Chang last file a Form 4?
The most recent primary Form 4 on record is dated 2 December 2025, one of 8 filings going back to 2024.
Has John B. Chang been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($183K) across all tracked filings.
John B. Chang is VP & CHIEF LEGAL OFFICER of COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI). 8 SEC Form 4 filings on record going back to 2024, most recently on 2 December 2025. Most recent open-market trade: sold $183K of CCOI on 12 November 2024. Lifetime open-market sales: $183K.
Recent transactions
11
The latest 11 SEC Form 4 transactions reported by John B. Chang.
InsiderAlpha's records for John B. Chang go back to 2024: 8 primary Form 4 filings, an average of 2.7 per year. No recorded transaction carries a Rule 10b5-1 plan flag. An absent flag does not establish whether a transaction was pre-arranged or discretionary.
