Granahan Investment Management, LLC

Position in CCOI — Cogent Communications Holdings, Inc.

CIK 1026710 WALTHAM, MA

Position in CCOI

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$4,200,823

-$1,779,878 QoQ

Shares Held

302,653

-4.7% QoQ

Ownership

0.591%

of shares outstanding

% of Portfolio

0.15%

of 13F equity value

Holder Rank

#27

of 224 holders

Holding Since

Jun 2023

13 quarters on record

Voting authority Sole 91% Shared 0% None 9%

Communication Services · as of Jun 30, 2026

Granahan Investment Management, LLC holds $11,624,958 across 2 Telecom Services names. CCOI ranks #2 (36.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)	Open
1	ATEX	Anterix Inc.	72,121	$7,424,135
2	CCOI	Cogent Communications Holdings, Inc. This page	302,653	$4,200,823

13 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$4,200,823	302,653	-4.7%	Shares	Sole	2026-08-14
2026-03-31	$5,980,701	317,447	+46.3%	Shares	Sole	2026-05-15
2025-12-31	$4,679,059	217,025	+99.1%	Shares	Sole	2026-02-17
2025-09-30	$4,179,728	108,989	-51.5%	Shares	Sole	2025-11-14
2025-06-30	$10,822,711	224,491	+21.0%	Shares	Sole	2025-08-14
2025-03-31	$11,378,032	185,582	+6.4%	Shares	Sole	2025-05-15
2024-12-31	$13,447,250	174,481	-4.4%	Shares	Sole	2025-02-14
2024-09-30	$13,852,894	182,467	+6.5%	Shares	Sole	2024-11-14
2024-06-30	$9,665,519	171,253	+0.9%	Shares	Sole	2024-08-14
2024-03-31	$11,084,018	169,662	+22.1%	Shares	Sole	2024-05-15
2023-12-31	$10,566,331	138,921	+24.1%	Shares	Sole	2024-02-14
2023-09-30	$6,931,004	111,971	+175.2%	Shares	Sole	2023-11-14
2023-06-30	$2,737,559	40,683	—	Shares	Sole	2023-08-14
No filing history on record for this holder in this stock.