CCOI · Cogent Communications Holdings, Inc. · Holdings

$9.33 +0.24 (+2.64%) At close · Sep 11

S&P 600 member Russell 2000 member Rebalance outlook locked

Market Cap

$477.84M

51.22M

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.

Use institutional holdings through the 13F API or MCP →

Quarter:

Holders: 228

Total Value: $673,663,239

Total Shares: 48,534,826

Showing 1–100 of 238 holdings by value · page 1 of 3

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 228 13F filers · Δ vs Mar 31, 2026

Top Holder

15.2%

+2.3 pts

Top 5

40.9%

+6.7 pts

Top 10

59.1%

+8.2 pts

HHI

509

Broadly held+104

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: -12

Institutional value: -34.7%

Shares held: -12.3%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mid Park West Asset Management LLC	+1,171,138	3,106,339
Mega CITADEL ADVISORS LLC	+550,061	1,628,441
Mega STATE STREET CORP	+506,102	2,779,367
Mega AQR CAPITAL MANAGEMENT LLC	+405,652	615,561
Mega BlackRock, Inc.	+301,012	7,376,384

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mega MORGAN STANLEY	−1,255,479	627,593
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP	−783,323	691,590
Mid BlackBarn Capital Partners LP	−750,000	250,000
Mega JANE STREET GROUP, LLC	−501,267	199,719
Mega D. E. Shaw & Co., Inc.	−494,421	284,694

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Small AYAL Capital Advisors Ltd	400,000	$5,552,000
Mid Jump Financial, LLC	251,745	$3,494,220
Mid Y-Intercept (Hong Kong) Ltd	154,019	$2,137,783
Mid ALGERT GLOBAL LLC	132,470	$1,838,683
Large Schonfeld Strategic Advisors LLC	86,639	$1,202,549

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Small Tyro Capital Management LLC	1,600,000	$30,144,000
Mid DigitalBridge Group, Inc.	1,142,952	$21,533,214
Mid 683 Capital Management, LLC	950,300	$17,903,652
Small Oakum Bay Capital LLC	690,374	$13,006,646
Small BLUEFIN CAPITAL MANAGEMENT, LLC	688,304	$2,613,157

Filter: New 42 Increased 78 Reduced 76 Sold out 54 Unchanged 32

Showing 100 of 238

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

BlackRock, Inc.

$102,384,204

15.20%

7,376,384

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	91,769	$1,273,753	1.2%	Sole
BlackRock Investment Management (Australia) Ltd	132	$1,832	0.0%	Sole
BlackRock Asset Management Canada Ltd	24,764	$343,724	0.3%	Sole
BlackRock Investment Management, LLC	150,062	$2,082,860	2.0%	Sole
BLACKROCK ADVISORS LLC	110,040	$1,527,355	1.5%	Sole
BlackRock Fund Advisors	5,283,496	$73,334,924	71.6%	Sole
BlackRock Institutional Trust Company, N.A.	1,460,084	$20,265,965	19.8%	Sole
BlackRock Fund Managers Ltd.	8,287	$115,023	0.1%	Sole
BlackRock Investment Management (UK) Ltd.	18,021	$250,131	0.2%	Sole
BlackRock (Netherlands) B.V.	765	$10,618	0.0%	Sole
BlackRock Asset Management Ireland Ltd	157,531	$2,186,530	2.1%	Sole
BlackRock Life Ltd	1,483	$20,584	0.0%	Sole
BlackRock Asset Management Schweiz AG	8,845	$122,768	0.1%	Sole
Aperio Group, LLC	61,105	$848,137	0.8%	Sole

TURTLE CREEK ASSET MANAGEMENT INC.

$58,344,954

8.66%

4,203,527

Park West Asset Management LLC

$43,115,985

6.40%

3,106,339

STATE STREET CORP

$38,577,613

5.73%

2,779,367

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS EUROPE LIMITED joint	2,779,367	$38,577,613	100.0%	Defined

VANGUARD PORTFOLIO MANAGEMENT LLC

$33,102,814

4.91%

2,384,929

EdgePoint Investment Group Inc.

$31,693,286

4.70%

2,283,378

VANGUARD CAPITAL MANAGEMENT LLC

$28,283,498

4.20%

2,037,716

Newtyn Management, LLC

$22,983,822

3.41%

1,655,895

GEODE CAPITAL MANAGEMENT, LLC

$17,286,776

2.57%

1,245,445

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	177,791	$2,467,739	14.3%	Defined
Held directly	1,067,654	$14,819,037	85.7%	Defined

CITADEL ADVISORS LLC

$16,274,868

2.42%

1,172,541

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	911,048	$12,645,346	77.7%	Defined
Held directly	261,493	$3,629,522	22.3%	Defined

MAGNOLIA GROUP, LLC

$13,598,041

2.02%

979,686

GOLDMAN SACHS GROUP INC

$13,507,154

2.01%

973,138

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	70,686	$981,121	7.3%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	877,652	$12,181,809	90.2%	Defined
Goldman Sachs Trust Company, N.A. joint	24,800	$344,224	2.5%	Other

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$11,176,786

1.66%

805,244

GILDER GAGNON HOWE & CO LLC

$10,878,908

1.61%

783,783

Broad Run Investment Management, LLC

$9,162,604

1.36%

660,130

MORGAN STANLEY

$8,710,988

1.29%

627,593

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	39	$541	0.0%	Defined
MORGAN STANLEY & CO. LLC	127,966	$1,776,168	20.4%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	239,666	$3,326,564	38.2%	Defined
MORGAN STANLEY SMITH BARNEY LLC	3,674	$50,994	0.6%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	254,098	$3,526,879	40.5%	Defined
EATON VANCE MANAGEMENT	2,150	$29,842	0.3%	Defined

AQR CAPITAL MANAGEMENT LLC

$8,543,984

1.27%

615,561

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Compound Planning, Inc.	18	$249	0.0%	Other
Arax Advisory Partners	7,515	$104,308	1.2%	Other
HALBERT HARGROVE GLOBAL ADVISORS, LLC	1,490	$20,681	0.2%	Other
Stokes Family Office, LLC	134	$1,859	0.0%	Other
Held directly	606,404	$8,416,887	98.5%	Defined

Harspring Capital Management, LLC

$8,319,921

1.24%

599,418

HRT FINANCIAL LP

$7,740,515

1.15%

557,674

NORTHERN TRUST CORP

$7,171,558

1.06%

516,683

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	456,115	$6,330,875	88.3%	Defined
NORTHERN TRUST GLOBAL INVESTMENTS LTD	36,856	$511,561	7.1%	Defined
MASON STREET ADVISORS, LLC joint	15,965	$221,594	3.1%	Other
DWS INVESTMENT MANAGEMENT AMERICAS, INC joint	7,747	$107,528	1.5%	Other

UBS Group AG

$7,115,136

1.06%

512,618

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Financial Services Inc	2,830	$39,280	0.6%	Defined
UBS AG	506,002	$7,023,307	98.7%	Defined
UBS Switzerland AG	3,786	$52,549	0.7%	Defined

CenterBook Partners LP

$6,987,983

1.04%

503,457

AYAL Capital Advisors Ltd

$5,552,000

0.82%

400,000

FRONTIER CAPITAL MANAGEMENT CO LLC

$5,310,599

0.79%

382,608

VANGUARD FIDUCIARY TRUST CO

$4,776,219

0.71%

344,108

BNP PARIBAS ARBITRAGE, SA

$4,554,402

0.68%

328,127

Granahan Investment Management, LLC

$4,200,823

0.62%

302,653

PDT Partners, LLC

$4,114,573

0.61%

296,439

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$3,996,052

0.59%

287,900

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	287,900	$3,996,052	100.0%	Other

D. E. Shaw & Co., Inc.

$3,951,552

0.59%

284,694

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
D. E. SHAW & CO, L.P.	128,394	$1,782,108	45.1%	Defined
D. E. Shaw Adviser II, L.L.C. joint	156,300	$2,169,444	54.9%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$3,897,365

0.58%

280,790

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	280,790	$3,897,365	100.0%	Other

Invesco Ltd.

$3,732,647

0.55%

268,923

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Invesco Advisers, Inc. joint	19,333	$268,340	7.2%	Defined
Invesco Trust Co joint	19,709	$273,560	7.3%	Defined
Invesco Investment Advisers LLC	10,271	$142,561	3.8%	Defined
Invesco Capital Management LLC	219,610	$3,048,186	81.7%	Defined

JPMORGAN CHASE & CO

$3,712,704

0.55%

267,486

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
J.P. Morgan Trust Co of Delaware	640	$8,883	0.2%	Other
JPMorgan Chase Bank, N.A.	20,601	$285,941	7.7%	Defined
J.P. Morgan Investment Management Inc.	15,404	$213,807	5.8%	Defined
J.P. Morgan Securities LLC	230,841	$3,204,073	86.3%	Defined

FourWorld Capital Management LLC

$3,685,140

0.55%

265,500

Bank of New York Mellon Corp

$3,684,997

0.55%

265,490

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Investments Corporation	129,227	$1,793,670	48.7%	Defined
BNY Mellon Investment Adviser, Inc.	38,462	$533,852	14.5%	Defined
The Bank of New York Mellon	90,959	$1,262,510	34.3%	Defined
BNY Mellon, NA joint	6,840	$94,938	2.6%	Defined
Held directly	2	$27	0.0%	Defined

CITADEL ADVISORS LLC

$3,607,412

0.54%

259,900

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	259,900	$3,607,412	100.0%	Defined

BANK OF AMERICA CORP /DE/

$3,537,469

0.53%

254,861

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF AMERICA NA	177,802	$2,467,891	69.8%	Defined
BOFA SECURITIES, INC.	77,059	$1,069,578	30.2%	Defined

Jump Financial, LLC

$3,494,220

0.52%

251,745

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jump Trading Holdings, LLC	1,591	$22,083	0.6%	Defined
Leap GP LLC joint	250,154	$3,472,137	99.4%	Defined

BlackBarn Capital Partners LP

$3,470,000

0.52%

250,000

HERALD INVESTMENT MANAGEMENT Ltd

$3,367,288

0.50%

242,600

MYDA Advisors LLC

$3,331,200

0.49%

240,000

Palliser Capital (UK) Ltd

$3,281,134

0.49%

236,393

PRINCIPAL FINANCIAL GROUP INC

$3,242,825

0.48%

233,633

Squarepoint Ops LLC

$3,137,365

0.47%

226,035

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Squarepoint Capital LLP	226,035	$3,137,365	100.0%	Defined

XTX Topco Ltd

$3,057,625

0.45%

220,290

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	220,290	$3,057,625	100.0%	Defined

CITADEL ADVISORS LLC

$2,720,480

0.40%

196,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	196,000	$2,720,480	100.0%	Defined

Nuveen, LLC

$2,357,850

0.35%

169,874

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Nuveen Asset Management, LLC joint	6,695	$92,926	3.9%	Defined
TEACHERS ADVISORS, LLC joint	163,179	$2,264,924	96.1%	Defined

FMR LLC

$2,292,600

0.34%

165,173

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	163,440	$2,268,547	99.0%	Defined
STRATEGIC ADVISERS LLC	149	$2,068	0.1%	Defined
FIAM LLC	1,584	$21,985	1.0%	Defined

Public Sector Pension Investment Board

$2,277,832

0.34%

164,109

Global Endowment Management, LP

$2,201,118

0.33%

158,582

Y-Intercept (Hong Kong) Ltd

$2,137,783

0.32%

154,019

CAXTON ASSOCIATES LLP

$2,014,071

0.30%

145,106

UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC

$1,987,057

0.29%

143,160

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Group AG	393	$5,454	0.3%	Defined
UBS Asset Management Switzerland AG	93,715	$1,300,764	65.5%	Defined
UBS Asset Management (UK) Ltd.	38,036	$527,938	26.6%	Defined
Held directly	11,016	$152,901	7.7%	Defined

TUDOR INVESTMENT CORP ET AL

$1,933,053

0.29%

139,269

BLAIR WILLIAM & CO/IL

$1,865,208

0.28%

134,381

ALGERT GLOBAL LLC

$1,838,683

0.27%

132,470

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$1,705,852

0.25%

122,900

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	122,900	$1,705,852	100.0%	Other

LPL Financial LLC

$1,697,746

0.25%

122,316

MILLENNIUM MANAGEMENT LLC

$1,653,635

0.25%

119,138

RHUMBLINE ADVISERS

$1,650,540

0.25%

118,915

BOOTHBAY FUND MANAGEMENT, LLC

$1,643,433

0.24%

118,403

Advisors Asset Management, Inc.

$1,587,525

0.24%

114,375

Legal & General Group Plc

$1,428,529

0.21%

102,920

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Legal & General Investment Management America Inc	72,980	$1,012,962	70.9%	Defined
Legal & General Investment Management Ltd joint	29,940	$415,567	29.1%	Defined

Crawford Fund Management, LLC

$1,375,508

0.20%

99,100

Skylands Capital, LLC

$1,366,139

0.20%

98,425

Swiss National Bank

$1,360,240

0.20%

98,000

WINTON GROUP Ltd

$1,235,444

0.18%

89,009

Schonfeld Strategic Advisors LLC

$1,202,549

0.18%

86,639

AMERIPRISE FINANCIAL INC

$1,080,196

0.16%

77,824

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Columbia Management Investment Advisers, LLC	77,312	$1,073,090	99.3%	Defined
Ameriprise Financial Services, LLC	512	$7,106	0.7%	Defined

STATE OF WISCONSIN INVESTMENT BOARD

$1,050,410

0.16%

75,678

JANE STREET GROUP, LLC

$1,035,448

0.15%

74,600

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	74,600	$1,035,448	100.0%	Defined

PRICE T ROWE ASSOCIATES INC /MD/

$1,017,251

0.15%

73,289

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
T. Rowe Price International Ltd	73,289	$1,017,251	100.0%	Defined

WELLS FARGO & COMPANY/MN

$970,197

0.14%

69,899

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO BANK N A	46,501	$645,433	66.5%	Defined
WELLS FARGO ADVISORS FINANCIAL NETWORK, LLC	1,340	$18,599	1.9%	Defined
WELLS FARGO CLEARING SERVICES, LLC	22,058	$306,165	31.6%	Defined

JANE STREET GROUP, LLC

$966,311

0.14%

69,619

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	69,619	$966,311	100.0%	Defined

NEW YORK STATE TEACHERS RETIREMENT SYSTEM

$953,694

0.14%

68,710

BROWN ADVISORY INC

$797,766

0.12%

57,476

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Brown Advisory LLC	57,476	$797,766	100.0%	Defined

DEUTSCHE BANK AG\

$787,383

0.12%

56,728

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
DWS INVESTMENT MANAGEMENT AMERICAS, INC	4,809	$66,748	8.5%	Defined
DWS Investments UK Ltd	51,919	$720,635	91.5%	Defined

ACADIAN ASSET MANAGEMENT LLC

$784,719

0.12%

56,536

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Acadian Inc	56,536	$784,719	100.0%	Defined

JANE STREET GROUP, LLC

$770,340

0.11%

55,500

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	55,500	$770,340	100.0%	Defined

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM

$752,004

0.11%

54,179

CITIGROUP INC

$743,189

0.11%

53,544

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citibank, N.A. joint	109	$1,512	0.2%	Defined
Citigroup Financial Products Inc. joint	53,435	$741,677	99.8%	Defined

IMC-Chicago, LLC

$701,425

0.10%

50,535

ALLIANCEBERNSTEIN L.P.

$698,455

0.10%

50,321

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Equitable Holdings, Inc.	50,321	$698,455	100.0%	Defined

PRUDENTIAL FINANCIAL INC

$696,429

0.10%

50,175

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
PGIM Quantitative Solutions LLC	50,175	$696,429	100.0%	Defined

RENAISSANCE TECHNOLOGIES LLC

$683,326

0.10%

49,231

Caption Management, LLC

$659,300

0.10%

47,500

VICTORY CAPITAL MANAGEMENT INC

$643,948

0.10%

46,394

Quantinno Capital Management LP

$627,653

0.09%

45,220

Walleye Capital LLC

$601,004

0.09%

43,300

Engineers Gate Manager LP

$582,404

0.09%

41,960

OPPENHEIMER & CO INC

$576,033

0.09%

41,501

CANADA LIFE ASSURANCE Co

$544,443

0.08%

39,225

New Age Alpha Advisors, LLC

$523,442

0.08%

37,712

Numerai GP LLC

$504,815

0.07%

36,370

ExodusPoint Capital Management, LP

$485,550

0.07%

34,982

Salvus Wealth Management, LLC

$483,384

0.07%

34,826

OCCUDO QUANTITATIVE STRATEGIES LP

$466,909

0.07%

33,639

PNC FINANCIAL SERVICES GROUP, INC.

$450,016

0.07%

32,422

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
PNC Bank, National Association	32,422	$450,016	100.0%	Defined

GROUP ONE TRADING LLC

$441,953

0.07%

31,841

Thrivent Financial for Lutherans

$435,401

0.06%

31,369

Key facts CIK 1158324 CUSIP 19239V302 13F (30d) 83 filings 81 filers Visit website Investor relations