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 Q3 2017?

186 institutional investors reported CCOI - COGENT COMMUNICATIONS HOLDINGS, INC. - COMMON STOCK, PAR VALUE $0.001 PER SHARE for Q3 2017. Use the holders table for investor-level position and value details.

CUSIP: 19239V302

Q3 2017 13F Holders as of 30 Sep 2017

Security type / class: Equity / COMMON STOCK, PAR VALUE $0.001 PER SHARE
Total 13F shares: 44,414,986
Total 13F value: $2,172,152,436
Share change: +1,042,550
Put/Call ratio: 31%
SEC-reported price per share: $48.90
Number of holders: 186
Value change: +$55,865,532
Number of buys: 94
Number of sells: 71
Shares outstanding: 50,113,196

Security key

19239V302

Report period

Q3 2017

Institutions

186

Top holders

CCOI full security history Ownership snapshot Full 13F holder table Newer quarter: Q4 2017 Previous quarter: Q2 2017 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: Q4 2017 Previous quarter: Q2 2017

Recent filing periods:

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 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 Finance, Inc.

Disclosed value leader

BlackRock Finance, Inc.

Comparable rows

15/15

Latest evidence

30 Jun 2017

13F Lead comparable stake: 10% Showing 1-6 of 15 holder rows.

Quick read

BlackRock Finance, Inc. leads the comparable SEC ownership view at 10%.

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 Finance, Inc.'s linked filing trail.

Comparable ownership Top 5

BlackRock Finance, Inc. 10%

VANGUARD GROUP INC 8.9%

FMR LLC 5.8%

FRONTIER CAPITAL MANAGEMENT CO LLC 5.2%

RENAISSANCE TECHNOLOGIES LLC 4.1%

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 Finance, Inc.	13F Company 13F	10%	$205,670,000 5,128,950 shares	—	30 Jun 2017
VANGUARD GROUP INC	13F Company 13F	8.9%	$178,360,000 4,447,907 shares	—	30 Jun 2017
FMR LLC	13F Company 13F	5.8%	$116,961,000 2,916,717 shares	—	30 Jun 2017
FRONTIER CAPITAL MANAGEMENT CO LLC	13F Company 13F	5.2%	$103,514,000 2,581,398 shares	—	30 Jun 2017
RENAISSANCE TECHNOLOGIES LLC	13F Company 13F	4.1%	$82,550,000 2,058,600 shares	—	30 Jun 2017
JENNISON ASSOCIATES LLC	13F Company 13F	3.7%	$74,897,000 1,867,749 shares	—	30 Jun 2017

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 Q3 2017

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

Institutions

186

44,414,986

Rows available

186

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 Q3 2017 vs Q2 2017 Across Filers

Q2 2017 holders

183

Q3 2017 holders

186

Holder diff

Investor	Q2 2017 Shares	Q3 2017 Shares	Share Diff	Share Chg %	Q2 2017 value	Q3 2017 value	Value change	Value Chg %

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

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend