Form4insider filings, from the source

Company · CIK 0001158324 · SIC 4899 — Communications Services, NEC · Nasdaq

COGENT COMMUNICATIONS HOLDINGS, INC. · CCOI

Insider activity reported against this company. All insider holders · On EDGAR ↗

1M3M6M1Y2YAll datashares as filed — not split-adjusted
Open-market buys & salesbuys $0 · 0sales $68k · 2net −$68k
$10k$10k$100k$100k$1M$1MbuyssalesAug 28Sep 2Sep 7Sep 12Sep 18Sep 23Sep 28

Reported at this company — common stock

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Sep 15, 2026 SForm 4 →Sep 15, 5:50 pm EDTHenry W KilmerVP OF NETWORK STRATEGY2,400$9.21$22,10436,200−6.22%
Sep 2, 2026 SForm 4 →Sep 3, 9:45 am EDTThaddeus Gerard WeedVICE PRESIDENT, CFO4,850$9.37$45,445193,050−2.45%

Reported at this company — derivatives (options, RSUs, warrants)

No reported derivative activity in this period.