Agreement of Reporting Persons

Exhibit A

Agreement of Reporting Persons

Each of the undersigned hereby agrees that the Amendment No. 1 to Schedule 13D filed on the date hereof with respect to the shares of Common Stock of Cogent Communications Group, Inc. has been filed on behalf of the undersigned.

Signature

	Dated:  April 20, 2004
Broadview Capital Partners L.P.
	By:	Broadview Capital Partners Management LLC
	Its:	General Partner
	By:	/s/ Xxxxx X. Xxxxxxx
		Xxxxx X. Xxxxxxx
		Chief Financial Officer
Broadview Capital Partners Qualified Purchaser Fund L.P.
	By:	Broadview Capital Partners Management LLC
	Its:	General Partner
	By:	/s/ Xxxxx X. Xxxxxxx
		Xxxxx X. Xxxxxxx
		Chief Financial Officer
Broadview Capital Partners Affiliates Fund LLC
	By:	Broadview Capital LLC
	Its:	Manager
	By:	/s/ Xxxxx X. Xxxxxxx
		Xxxxx X. Xxxxxxx
		Chief Financial Officer
Broadview BCPSBS Fund L.P.
	By:	Broadview BCPSBS Fund LLC
	Its:	Manager
	By:	/s/ Xxxxx X. Xxxxxxx
		Xxxxx X. Xxxxxxx
		Attorney-in-Fact

Broadview Capital Partners Management LLC
	By:	/s/ Xxxxx X. Xxxxxxx
		Xxxxx X. Xxxxxxx
		Chief Financial Officer
BCI Holdings, L.P.
	By:	Broadview Holdings LLP
	Its:	General Partner
	By:	/s/ Xxxxx X. Xxxxxxx
		Xxxxx X. Xxxxxxx
		Attorney-in-Fact
Broadview Holdings LLP
	By:	/s/ Xxxxx X. Xxxxxxx
		Xxxxx X. Xxxxxxx
		Attorney-in-Fact
Individuals:
Xxxxxx X. Xxxxxx
Xxxxxxx X. Xxxxxxxx
Xxxx X. Xxxxxxxx
				By:	/s/ Xxxxx X. Xxxxxxx
					Xxxxx X. Xxxxxxx,
					Attorney-in-Fact for the
					above-listed individuals