Cogent Communications Holdings, Inc.: which funds bought and sold

Institutions that bought and sold Cogent Communications Holdings shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 116 institutions that filed 13F reports for both quarters added to or opened positions in Cogent Communications Holdings, and 116 cut or closed them. Together they sold a net 737K shares, −1.5% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 1.1M shares (+11.2%); index fund managers were net buyers of 456K shares (+2.7%). 40 opened a new position and 44 sold out entirely.

Bought, Q2 2026 116 institutions, 40 of them new holders Sold, Q2 2026 116 institutions, 44 of them sold out

Net change, all compared −737K shares (−1.5%)

Net change, active managers +1.1M shares (+11.2%), 20 bought, 17 sold

Buyers versus sellers

institutions compared, 264

116 bought 32 116 sold

Active managers and hedge funds 20 bought · 17 sold · +1.1M

Index fund managers 6 bought · 3 sold · +456K

Other institutions 90 bought · 96 sold · −2.3M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Park West Asset Management LLC Hedge fund	+1.2M +60.5%	3.1M	$43.1M
Citadel Advisors LLC Hedge fund	+746K +175.1%	1.2M	$16.3M
State Street Corp Index funds	+506K +22.3%	2.8M	$38.6M
AQR Capital Management LLC Hedge fund	+406K +193.3%	616K	$8.5M
Ayal Capital Advisors Ltd	+400K New position	400K	$5.6M
Blackrock, Inc. Index funds	+301K +4.3%	7.4M	$102M
Gilder Gagnon Howe & Co LLC Active manager	+284K +57.0%	784K	$10.9M
Goldman Sachs Group Inc	+260K +36.5%	973K	$13.5M
Jump Financial, LLC	+252K New position	252K	$3.5M
BNP Paribas Financial Markets	+250K +321.7%	328K	$4.6M
Myda Advisors LLC	+240K New position	240K	$3.3M
Xtx Topco Ltd	+191K +651.2%	220K	$3.1M
Squarepoint Ops LLC Hedge fund	+175K +341.1%	226K	$3.1M
Y-Intercept (Hong Kong) Ltd	+154K New position	154K	$2.1M
Susquehanna International Group, LLP	+151K +115.8%	281K	$3.9M
Global Endowment Management, LP	+140K +759.9%	159K	$2.2M
Algert Global LLC Hedge fund	+132K New position	132K	$1.8M
Caxton Associates LLP Hedge fund	+92K +174.4%	145K	$2M
UBS Group AG	+87K +20.3%	513K	$7.1M
Schonfeld Strategic Advisors LLC Hedge fund	+87K New position	87K	$1.2M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Park West Asset Management LLC Hedge fund	+1.2M +60.5%	3.1M	$43.1M
Citadel Advisors LLC Hedge fund	+746K +175.1%	1.2M	$16.3M
AQR Capital Management LLC Hedge fund	+406K +193.3%	616K	$8.5M
Gilder Gagnon Howe & Co LLC Active manager	+284K +57.0%	784K	$10.9M
Squarepoint Ops LLC Hedge fund	+175K +341.1%	226K	$3.1M
Algert Global LLC Hedge fund	+132K New position	132K	$1.8M
Caxton Associates LLP Hedge fund	+92K +174.4%	145K	$2M
Schonfeld Strategic Advisors LLC Hedge fund	+87K New position	87K	$1.2M
Acadian Asset Management LLC Active manager	+57K New position	57K	$781,000
Victory Capital Management Inc Active manager	+27K +137.7%	46K	$643,949

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Morgan Stanley	−1.3M −66.7%	628K	$8.7M
Digitalbridge Group, Inc.	−1.1M Sold out	0	—
Harspring Capital Management, LLC	−488K −44.9%	599K	$8.3M
D. E. Shaw & Co., Inc. Hedge fund	−454K −61.5%	285K	$4M
683 Capital Management, LLC Hedge fund	−450K Sold out	0	—
FMR LLC Active manager	−424K −71.9%	165K	$2.3M
Vanguard Portfolio Management LLC Index funds	−364K −13.2%	2.4M	$33.1M
Magnolia Group, LLC	−311K −24.1%	980K	$13.6M
Boothbay Fund Management, LLC Hedge fund	−261K −68.8%	118K	$1.6M
Blackbarn Capital Partners LP	−250K −50.0%	250K	$3.5M
Walleye Capital LLC Hedge fund	−227K −94.9%	12K	$170,308
Jpmorgan Chase & Co	−225K −45.7%	267K	$3.5M
Jane Street Group, LLC	−208K −74.9%	70K	$966,312
Turtle Creek Asset Management Inc.	−145K −3.3%	4.2M	$58.3M
Bluefin Capital Management, LLC	−132K Sold out	0	—
Millennium Management LLC Hedge fund	−109K −47.8%	119K	$1.7M
Palliser Capital (UK) Ltd	−98K −29.3%	236K	$3.3M
Man Group PLC Hedge fund	−90K Sold out	0	—
Vanguard Capital Management LLC Index funds	−83K −3.9%	2.0M	$28.3M
Simplex Trading, LLC	−77K −83.7%	15K	$207,728

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
D. E. Shaw & Co., Inc. Hedge fund	−454K −61.5%	285K	$4M
683 Capital Management, LLC Hedge fund	−450K Sold out	0	—
FMR LLC Active manager	−424K −71.9%	165K	$2.3M
Boothbay Fund Management, LLC Hedge fund	−261K −68.8%	118K	$1.6M
Walleye Capital LLC Hedge fund	−227K −94.9%	12K	$170,308
Millennium Management LLC Hedge fund	−109K −47.8%	119K	$1.7M
Man Group PLC Hedge fund	−90K Sold out	0	—
Aristeia Capital, L.L.C. Hedge fund	−59K Sold out	0	—
Point72 Asset Management, L.P. Hedge fund	−20K Sold out	0	—
Exoduspoint Capital Management, LP Hedge fund	−19K −34.7%	35K	$485,550

New positions

largest by value

Institution	Shares	Value June 30, 2026
Ayal Capital Advisors Ltd	400K	$5.6M
Jump Financial, LLC	252K	$3.5M
Myda Advisors LLC	240K	$3.3M
Y-Intercept (Hong Kong) Ltd	154K	$2.1M
Algert Global LLCHedge fund	132K	$1.8M
Schonfeld Strategic Advisors LLCHedge fund	87K	$1.2M
Acadian Asset Management LLCActive manager	57K	$781,000
New Age Alpha Advisors, LLC	38K	$523,443
Numerai Gp LLC	36K	$504,816
Occudo Quantitative Strategies LP	34K	$466,909

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Digitalbridge Group, Inc.	1.1M	$21.5M
683 Capital Management, LLCHedge fund	450K	$8.5M
Bluefin Capital Management, LLC	132K	$2.5M
Man Group PLCHedge fund	90K	$1.7M
Aristeia Capital, L.L.C.Hedge fund	59K	$1.1M
Caption Management, LLC	55K	$1M
Corient Private Wealth LP	48K	$897,633
Navis Wealth Advisors, LLC	40K	$744,180
Altfest L J & Co Inc	30K	$570,684
Reaves W H & Co Inc	28K	$529,366

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 223
Ten largest holders: 59.7%
Index fund managers: 37.2%
Active managers and hedge funds: 23.6%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	20	17	6	5	+1.1M	+11.2%
Index fund managers	6	3	0	0	+456K	+2.7%
Other institutions	90	96	34	39	−2.3M	−11.1%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Cogent Communications Holdings.

Only managers that filed a holdings report for both quarters are compared (264 here). 10 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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