$CCOI

$7.47 +$0.11 (1.49%) Close

$CCOI Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 51.2M shares outstanding

Who owns CCOI?

By type of holder

Institutions 91.8% Insiders 8.3% Everyone else 0.0%

Concentration Top 10 holders own 57.0%

BlackRock, Inc. 14.4% · Turtle Creek Asset Management Inc. 8.2%

Institutional ownership

91.8%

-3.6 pts vs last qtr

Institutional holders

223

-10 vs last qtr

Net shares bought

−1.8M

by institutions in Q2 2026

New / sold out

43 / 53

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Park West Asset Management LLC +1.2M
Citadel Advisors LLC +746.3K

Biggest sellers in Q2 2026

Morgan Stanley −1.3M
DigitalBridge Group, Inc. SOLD OUT −1.1M

Who is planning to sell?

Notices of proposed sale, last 12 months

$971K

13 notices from 4 people

Shares covered

49.5K

0.10% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Thaddeus Weed Officer $412K
Kilmer Henry W Officer $193K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

+6.8%

+0.73% a year

Each share's claim on the business

−6.4%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$42.1M vs $24M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years51% 3–5 years7% 1–3 years23% Under 1 year19%

Quarterly turnover

15.8%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting CCOI on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	7.4M	14.40%	+301.0K (+4.3%)	≤2021	0.0%
Shares held by quarter Peak holding7.4M (Q2'26) Change over 8 quarters+501.8K Share of the company14.400% BlackRock, Inc.'s full portfolio →
TC Turtle Creek Asset Management Inc.	4.2M	8.21%	−145.4K (−3.3%)	2024	2.3%
Shares held by quarter Peak holding4.6M (Q3'25) Change over 8 quarters+4.2M Share of the company8.210% Turtle Creek Asset Management Inc.'s full portfolio →

BlackRock, Inc.

7.4M

% of company

14.40%

Change vs last qtr

+301.0K (+4.3%)

Held since

≤2021

Turtle Creek Asset Management Inc.

4.2M

% of company

8.21%

Change vs last qtr

−145.4K (−3.3%)

Held since

2024

28 more super investors behind a free account

See every manager holding Cogent Communications Holdings, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting CCOI on Form N-PORT; together they hold 31.8% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Small-Cap ETF iShares Trust	$40M	2.9M	5.62%	0.04%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$20M	1.4M	2.82%	0.00%	June 30, 2026

iShares Core S&P Small-Cap ETF

iShares Trust

Position value

$40M

% of company

5.62%

% of the fund

0.04%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$20M

% of company

2.82%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Cogent Communications Holdings, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
BS Brooks Steven Insider	2.5M	4.87%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company4.870% Brooks Steven's insider activity →
SD Schaeffer Dave Insider	1.9M	3.65%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company3.650% Schaeffer Dave's insider activity →

Brooks Steven

Insider

2.5M

% of company

4.87%

Change vs last qtr

—

Held since

—

Schaeffer Dave

Insider

1.9M

% of company

3.65%

Change vs last qtr

—

Held since

—

12 more holders behind a free account

See every insider and 5%+ holder of Cogent Communications Holdings, Inc..

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