FRONTIER CAPITAL MANAGEMENT CO LLC

Position in CCOI — Cogent Communications Holdings, Inc.

CIK 351173 Boston, MA

Position in CCOI

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$7,521,078

+$65,566 QoQ

Shares Held

399,208

+15.4% QoQ

Ownership

0.797%

of shares outstanding

% of Portfolio

0.08%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

19 quarters on record

Voting authority Sole 76% Shared 0% None 24%

Communication Services · as of Mar 31, 2026

FRONTIER CAPITAL MANAGEMENT CO LLC holds $7,521,078 across 1 Telecom Services name. CCOI ranks #1 (100.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)	Open
1	CCOI	Cogent Communications Holdings, Inc. This page	399,208	$7,521,078

19 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$7,521,078	399,208	+15.4%	Shares	Sole	2026-05-15
2025-12-31	$7,455,512	345,803	+32.0%	Shares	Sole	2026-02-17
2025-09-30	$10,048,467	262,020	+59.1%	Shares	Sole	2025-11-14
2025-06-30	$7,939,174	164,679	-0.3%	Shares	Sole	2025-08-14
2025-03-31	$10,128,350	165,199	-3.0%	Shares	Sole	2025-05-15
2024-12-31	$13,121,629	170,256	-0.2%	Shares	Sole	2025-02-14
2024-09-30	$12,952,179	170,603	-1.5%	Shares	Sole	2024-11-14
2024-06-30	$9,771,005	173,122	+30.5%	Shares	Sole	2024-08-14
2024-03-31	$8,669,813	132,708	+18.6%	Shares	Sole	2024-05-15
2023-12-31	$8,512,254	111,915	+0.1%	Shares	Sole	2024-02-14
2023-09-30	$6,918,315	111,766	-1.0%	Shares	Sole	2023-11-14
2023-06-30	$7,595,627	112,879	-1.0%	Shares	Sole	2023-08-14
2023-03-31	$7,266,246	114,034	-8.3%	Shares	Sole	2023-05-15
2022-12-31	$7,097,498	124,343	+10.2%	Shares	Sole	2023-02-14
2022-09-30	$5,887,038	112,865	-23.7%	Shares	Sole	2022-11-14
2020-12-31	$8,858,065	147,955	-10.9%	Shares	Sole	2021-01-19
2020-09-30	$9,975,145	166,114	-7.7%	Shares	Sole	2020-11-16
2020-06-30	$13,924,258	179,993	-38.7%	Shares	Sole	2020-07-17
2020-03-31	$24,053,768	293,446	—	Shares	Sole	2020-04-16
No filing history on record for this holder in this stock.