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CCOI in the 13F filings

Cogent Communications HLDGS · CUSIP 19239V302

Sector · Communications and media
Quarter
Q2 2026Q1 2026Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023Q2 2023
Quarter end
31 Mar 2026
the date the book describes
Filed
18 May 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
22
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 0 listed it in both
Shares listed
4,067,678
combined, among listed positions
Reported value
$77m
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 15 buyers (opened or added shares) and 8 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +1,386,660.

Managers listing CCOI in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

22 of 22 holders

ActionFiling
D. E. Shaw & Co.738,815$14munder 0.1%Added+458,67915 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)588,788$11munder 0.1%Trimmed-227,15115 May 2026 (the filing on sec.gov)
Citadel Advisors LLC426,280$8.0munder 0.1%Added+259,15615 May 2026 (the filing on sec.gov)
PDT Partners LLC283,629$5.3m0.32%Newnew15 May 2026 (the filing on sec.gov)
Jane Street Group LLC277,486$5.2munder 0.1%Added+40,65012 May 2026 (the filing on sec.gov)
Invesco Ltd242,426$4.6munder 0.1%Trimmed-19,64212 May 2026 (the filing on sec.gov)
Walleye Capital LLC239,557$4.5munder 0.1%Added+138,14913 May 2026 (the filing on sec.gov)
Millennium Management LLC228,396$4.3munder 0.1%Added+189,61315 May 2026 (the filing on sec.gov)
AQR Capital Management LLC209,909$4.0munder 0.1%Added+180,17715 May 2026 (the filing on sec.gov)
Tudor Investment Corp139,692$2.6munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP130,113$2.5munder 0.1%Trimmed-3,34015 May 2026 (the filing on sec.gov)
Man Group PLC90,227$1.7munder 0.1%Trimmed-235,94115 May 2026 (the filing on sec.gov)
Winton Group Ltd70,093$1.3munder 0.1%Added+34,48912 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC67,131$1.3munder 0.1%Trimmed-21,90014 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc61,810$1.2munder 0.1%Added+10,51215 May 2026 (the filing on sec.gov)
AllianceBernstein LP50,321$1.1munder 0.1%Trimmed-7,14315 May 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP53,606$1.0munder 0.1%Newnew14 May 2026 (the filing on sec.gov)
Caxton Associates LLP52,879$996kunder 0.1%Newnew14 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC51,248$966kunder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP24,161$455kunder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd21,111$398kunder 0.1%Held018 May 2026 (the filing on sec.gov)
Point72 Asset Management LP20,000$377kunder 0.1%Newnew15 May 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

There is no earlier quarter on file to compare with.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (7)

Exited (2)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
3 in Q2 2024 to 3 in Q2 2026

Tracked managers listing it, at least.

0510152014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
CCOI by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20134$78mn.a.n.a.
Q3 20134$100mn.a.n.a.
Q4 20134$138mn.a.n.a.
Q1 20147$153mn.a.n.a.
Q2 20144$144mn.a.n.a.
Q3 20143$97mn.a.n.a.
Q4 20144$95mn.a.n.a.
Q1 20153$88mn.a.n.a.
Q2 20156$118mn.a.n.a.
Q3 20153$116mn.a.n.a.
Q4 20153$101mn.a.n.a.
Q1 20163$107mn.a.n.a.
Q2 20162$107mn.a.n.a.
Q3 20162$95mn.a.n.a.
Q4 20162$91mn.a.n.a.
Q1 20174$118mn.a.n.a.
Q2 20173$106mn.a.n.a.
Q3 20173$146mn.a.n.a.
Q4 20172$151mn.a.n.a.
Q1 20183$177mn.a.n.a.
Q2 20184$227mn.a.n.a.
Q3 20186$256mn.a.n.a.
Q4 20185$223mn.a.n.a.
Q1 20195$265mn.a.n.a.
Q2 20197$290mn.a.n.a.
Q3 20197$272mn.a.n.a.
Q4 20197$329mn.a.n.a.
Q1 202010$382mn.a.n.a.
Q2 202014$357mn.a.n.a.
Q3 202011$262mn.a.n.a.
Q4 20206$189mn.a.n.a.
Q1 20216$181mn.a.n.a.
Q2 20215$195mn.a.n.a.
Q3 20214$178mn.a.n.a.
Q4 20213$182mn.a.n.a.
Q1 20223$166mn.a.n.a.
Q2 20223$159mn.a.n.a.
Q3 20225$128mn.a.n.a.
Q4 20224$120mn.a.n.a.
Q1 20235$136mn.a.n.a.
Q2 20232$123mn.a.n.a.
Q3 20232$109mn.a.n.a.
Q4 20233$141m21
Q1 20243$159m21
Q2 20243$118m11
Q3 20244$155m12
Q4 20244$146m21
Q1 20253$99m12
Q2 20253$49m20
Q3 20252$23m11
Q1 20263$7.7m158
Q2 20263$7.4m1311

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

CCOI and NFLX →CCOI and TMUS →CCOI and CMCSA →Choose a stock to compare with CCOI →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own CCOI, latest filings →Back to the 13F Explorer →