COGENT COMMUNICATIONS HOLDINGS, INC. - COMMON STOCK, PAR VALUE $0.001 PER SHARE (CCOI)

Q: What does CUSIP 19239V302 represent in this 13F holders report?

CUSIP 19239V302 is the security identifier for CCOI - COGENT COMMUNICATIONS HOLDINGS, INC. - COMMON STOCK, PAR VALUE $0.001 PER SHARE used to aggregate holder disclosures.

Q: How many institutions held CCOI - COGENT COMMUNICATIONS HOLDINGS, INC. - COMMON STOCK, PAR VALUE $0.001 PER SHARE in Q1 2026?

230 institutional investors reported CCOI - COGENT COMMUNICATIONS HOLDINGS, INC. - COMMON STOCK, PAR VALUE $0.001 PER SHARE for Q1 2026. Use the holders table for investor-level position and value details.

CUSIP: 19239V302

Q1 2026 13F Holders as of 31 Mar 2026

Security type / class: Equity / COMMON STOCK, PAR VALUE $0.001 PER SHARE
Total 13F shares: 48,814,238
Total 13F value: $919,117,574
Share change: +1,040,207
Put/Call ratio: 22%
SEC-reported price per share: $18.84
Number of holders: 230
Value change: +$12,832,257
Number of buys: 111
Number of sells: 127
Shares outstanding: 50,113,196

Security key

19239V302

Report period

Q1 2026

Institutions

230

Top holders

CCOI full security history Ownership snapshot Full 13F holder table Newer quarter: Q2 2026 Previous quarter: Q4 2025 COGENT COMMUNICATIONS HOLDINGS, INC. SEC filings COGENT COMMUNICATIONS HOLDINGS, INC. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 19239V302

Newer quarter: Q2 2026 Previous quarter: Q4 2025

Recent filing periods:

Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024

Ownership snapshot

Top reported holders of CCOI - COGENT COMMUNICATIONS HOLDINGS, INC. - COMMON STOCK, PAR VALUE $0.001 PER SHARE (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

BlackRock, Inc.

Disclosed value leader

BlackRock, Inc.

Comparable rows

15/15

Latest evidence

31 Mar 2026

13F 13D/G 3/4/5 Lead comparable stake: 14% 13D/G row: BlackRock, Inc. Showing 1-6 of 15 holder rows.

Quick read

BlackRock, Inc. leads the comparable SEC ownership view at 14%.

15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens BlackRock, Inc.'s linked filing trail.

Comparable ownership Top 5

BlackRock, Inc. 14%

Turtle Creek Asset Management Inc. 8.2%

VANGUARD PORTFOLIO MANAGEMENT LLC 5.6%

John B. Chang 0.38%

Mark Andrew Harris 0.22%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
BlackRock, Inc.	13F 13D/G Company 13F 13D/G	14% from 13D/G	$155,038,337 7,191,017 shares	—	31 Dec 2025
Turtle Creek Asset Management Inc.	13D/G 13F Company 13D/G 13F	8.2%	$87,034,421 4,036,847 shares	-$12,226,374	31 Dec 2025
VANGUARD PORTFOLIO MANAGEMENT LLC	13D/G Vanguard Portfolio Management 13D/G	5.6%	$52,585,115 2,791,142 shares	$0	31 Mar 2026
John B. Chang	3/4/5 VP & CHIEF LEGAL OFFICER 3/4/5	0.38%	$4,640,144 190,717 shares	—	31 Dec 2025
Mark Andrew Harris	3/4/5 VP & Chief Revenue Officer 3/4/5	0.22%	$2,680,387 110,168 shares	—	31 Dec 2025
James Bubeck	3/4/5 CHIEF REVENUE OFFICER 3/4/5	0.11%	$2,619,222 55,142 shares	—	04 Jun 2025

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q1 2026

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

230

48,814,238

Rows available

230

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q1 2026 vs Q4 2025 Across Filers

Q4 2025 holders

246

Q1 2026 holders

230

Holder diff

-16

Investor	Q4 2025 Shares	Q1 2026 Shares	Share Diff	Share Chg %	Q4 2025 value	Q1 2026 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend