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Equibles

CCOI

Cogent Communications Holdings, Inc.

Company with tickers: CCOI

CIK
1158324
CUSIP
19239V302
Shares Outstanding
50,077,663
13F Activity (30d)
113 filings 109 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 240
Total Value: $1,042,945,629
Total Shares: 55,358,056
Showing 1–100 of 258 holdings by value · page 1 of 3

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 240 13F filers · Δ vs Dec 31, 2025
Top Holder
12.8%
Jun 2023 → Mar 2026 · range 12.8% – 16.9%
−1.1 pts
Top 5
33.8%
Jun 2023 → Mar 2026 · range 33.8% – 42.3%
−6.9 pts
Top 10
50.3%
Jun 2023 → Mar 2026 · range 46.6% – 53.7%
−3.3 pts
HHI
397
Jun 2023 → Mar 2026 · range 397 – 555
Broadly held−85

Quarterly Activity

vs Dec 31, 2025
New
41
Increased
87
Decreased
77
Sold Out
55
Unchanged
35
Holder count: -14
Institutional value: -6.9%
Shares held: +6.5%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP +1,076,960 1,474,913
Mega MORGAN STANLEY +630,621 1,883,072
Mega CITADEL ADVISORS LLC +607,756 1,078,380
Small Tyro Capital Management LLC +600,000 1,600,000
Mid Park West Asset Management LLC +526,105 1,935,201

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mega BANK OF AMERICA CORP /DE/ −899,068 302,393
Mega ROYAL BANK OF CANADA −493,519 5,447
Small Harspring Capital Management, LLC −315,500 1,087,000
Large Man Group plc −235,941 90,227
Mid REAVES W H & CO INC −231,000 28,098

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD PORTFOLIO MANAGEMENT LLC 2,748,759 $51,786,619
Mega VANGUARD CAPITAL MANAGEMENT LLC 2,120,531 $39,950,804
Mega VANGUARD FIDUCIARY TRUST CO 334,428 $6,300,623
Mid PDT Partners, LLC 283,629 $5,343,570
Small FourWorld Capital Management LLC 265,500 $5,002,020

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 5,580,271 $120,310,640
Mega FIRST TRUST ADVISORS LP 1,177,398 $25,384,700
Small MIG Capital, LLC 569,220 $12,272,383
Small Redmond Asset Management, LLC 200,082 $4,313,767
Mid Nishkama Capital, LLC 179,661 $3,873,491
Filter: New 41 Increased 87 Reduced 77 Sold out 55 Unchanged 35
Showing 100 of 258
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega BlackRock, Inc. $133,300,002 12.78% 7,075,372
Mid TURTLE CREEK ASSET MANAGEMENT INC. $81,933,219 7.86% 4,348,897
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $51,786,619 4.97% 2,748,759
Large EdgePoint Investment Group Inc. $43,018,841 4.12% 2,283,378
Mega STATE STREET CORP $42,828,312 4.11% 2,273,265
Mega VANGUARD CAPITAL MANAGEMENT LLC $39,950,804 3.83% 2,120,531
Mid Park West Asset Management LLC $36,459,186 3.50% 1,935,201
Mega MORGAN STANLEY $35,477,072 3.40% 1,883,072
Small Newtyn Management, LLC $30,144,000 2.89% 1,600,000
Small Tyro Capital Management LLC $30,144,000 2.89% 1,600,000
Small MAGNOLIA GROUP, LLC $24,307,443 2.33% 1,290,204
Mega GEODE CAPITAL MANAGEMENT, LLC $22,714,162 2.18% 1,205,635
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $21,660,348 2.08% 1,149,700
Mid DigitalBridge Group, Inc. $21,533,214 2.06% 1,142,952
Small Harspring Capital Management, LLC $20,479,080 1.96% 1,087,000
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $14,320,604 1.37% 760,117
Mega D. E. Shaw & Co., Inc. $13,919,274 1.33% 738,815
Mega GOLDMAN SACHS GROUP INC $13,431,675 1.29% 712,934
Small Oakum Bay Capital LLC $13,006,646 1.25% 690,374
Small Broad Run Investment Management, LLC $12,494,688 1.20% 663,200
Mega FMR LLC $11,092,764 1.06% 588,788
Mega CITADEL ADVISORS LLC $9,966,360 0.96% 529,000
Mid BLUEFIN CAPITAL MANAGEMENT, LLC $9,864,624 0.95% 523,600
Large HRT FINANCIAL LP $9,591,349 0.92% 509,095
Mid 683 Capital Management, LLC $9,420,000 0.90% 500,000
Mid BlackBarn Capital Partners LP $9,420,000 0.90% 500,000
Mid BlackBarn Capital Partners LP $9,420,000 0.90% 500,000
Mid GILDER GAGNON HOWE & CO LLC $9,406,623 0.90% 499,290
Mega NORTHERN TRUST CORP Bank $9,367,152 0.90% 497,195
Mid CenterBook Partners LP $9,312,291 0.89% 494,283
Mega JPMORGAN CHASE & CO $9,278,094 0.89% 492,468
Mid 683 Capital Management, LLC $8,483,652 0.81% 450,300
Mega CITADEL ADVISORS LLC $8,031,114 0.77% 426,280
Mega UBS Group AG $8,025,236 0.77% 425,968
Mega JANE STREET GROUP, LLC $7,641,504 0.73% 405,600
Mid FRONTIER CAPITAL MANAGEMENT CO LLC $7,521,078 0.72% 399,208
Mid BOOTHBAY FUND MANAGEMENT, LLC $7,139,022 0.68% 378,929
Small Palliser Capital (UK) Ltd $6,300,924 0.60% 334,444
Mega VANGUARD FIDUCIARY TRUST CO Bank $6,300,623 0.60% 334,428
Mid Granahan Investment Management, LLC $5,980,701 0.57% 317,447
Mega BANK OF AMERICA CORP /DE/ Bank $5,697,084 0.55% 302,393
Mid PDT Partners, LLC $5,343,570 0.51% 283,629
Mega JANE STREET GROUP, LLC $5,227,835 0.50% 277,486
Small FourWorld Capital Management LLC $5,002,020 0.48% 265,500
Mega Bank of New York Mellon Corp Bank $4,984,477 0.48% 264,569
Large Caption Management, LLC $4,898,400 0.47% 260,000
Small HERALD INVESTMENT MANAGEMENT Ltd $4,570,584 0.44% 242,600
Mega Invesco Ltd. $4,567,303 0.44% 242,426
Large Walleye Capital LLC $4,513,253 0.43% 239,557
Mega PRINCIPAL FINANCIAL GROUP INC $4,374,760 0.42% 232,206
Mega MILLENNIUM MANAGEMENT LLC $4,302,980 0.41% 228,396
Mega AQR CAPITAL MANAGEMENT LLC $3,954,681 0.38% 209,909
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $3,675,684 0.35% 195,100
Large Public Sector Pension Investment Board Pension $3,198,259 0.31% 169,759
Mega Nuveen, LLC $3,174,539 0.30% 168,500
Large BLAIR WILLIAM & CO/IL $3,137,255 0.30% 166,521
Mid Advisors Asset Management, Inc. $2,820,310 0.27% 149,698
Large TUDOR INVESTMENT CORP ET AL $2,631,797 0.25% 139,692
Mega RHUMBLINE ADVISERS $2,598,412 0.25% 137,920
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $2,575,442 0.25% 136,701
Mid BLUEFIN CAPITAL MANAGEMENT, LLC $2,492,607 0.24% 132,304
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $2,451,328 0.24% 130,113
Mega CITADEL ADVISORS LLC $2,319,204 0.22% 123,100
Small Crawford Fund Management, LLC $2,074,284 0.20% 110,100
Large Quantinno Capital Management LP $2,051,205 0.20% 108,875
Mega Legal & General Group Plc $2,008,945 0.19% 106,632
Mid MARINER INVESTMENT GROUP LLC $1,978,200 0.19% 105,000
Mid J. Goldman & Co LP $1,936,752 0.19% 102,800
Small GARNET EQUITY CAPITAL HOLDINGS, INC. $1,884,000 0.18% 100,000
Mega WELLS FARGO & COMPANY/MN $1,859,148 0.18% 98,681
Mega Swiss National Bank Bank $1,827,480 0.18% 97,000
Mid SIMPLEX TRADING, LLC $1,731,264 0.17% 91,893
Mega LPL Financial LLC $1,706,583 0.16% 90,583
Large Man Group plc $1,699,876 0.16% 90,227
Small MYDA Advisors LLC $1,695,600 0.16% 90,000
Mid Brooklyn Investment Group $1,540,942 0.15% 81,791
Mega AMERIPRISE FINANCIAL INC $1,520,481 0.15% 80,705
Mega BNP PARIBAS ARBITRAGE, SA $1,465,865 0.14% 77,806
Large STATE OF WISCONSIN INVESTMENT BOARD $1,402,713 0.13% 74,454
Mid WINTON GROUP Ltd $1,320,552 0.13% 70,093
Large NEW YORK STATE TEACHERS RETIREMENT SYSTEM Pension $1,304,425 0.13% 69,237
Small Skylands Capital, LLC $1,293,366 0.12% 68,650
Large RENAISSANCE TECHNOLOGIES LLC $1,264,748 0.12% 67,131
Large Point72 Asset Management, L.P. $1,254,744 0.12% 66,600
Mega PRICE T ROWE ASSOCIATES INC /MD/ $1,164,500 0.11% 61,810
Large Point72 Asset Management, L.P. $1,164,312 0.11% 61,800
Mid ARISTEIA CAPITAL, L.L.C. $1,111,428 0.11% 58,993
Large BROWN ADVISORY INC $1,063,122 0.10% 56,429
Large Caption Management, LLC $1,036,200 0.10% 55,000
Large ExodusPoint Capital Management, LP $1,009,937 0.10% 53,606
Mid CAXTON ASSOCIATES LLP $996,240 0.10% 52,879
Large Squarepoint Ops LLC $965,512 0.09% 51,248
Mega ALLIANCEBERNSTEIN L.P. $948,047 0.09% 50,321
Large PRUDENTIAL FINANCIAL INC $933,427 0.09% 49,545
Mega DEUTSCHE BANK AG\ Bank $931,072 0.09% 49,420
Large SG Americas Securities, LLC Broker-Dealer $898,988 0.09% 47,717
Large Corient Private Wealth LLC $897,631 0.09% 47,645
Mid IMC-Chicago, LLC $869,861 0.08% 46,171
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $861,251 0.08% 45,714
Large Russell Investments Group, Ltd. $812,925 0.08% 43,149

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