EXHIBIT A AGREEMENT OF REPORTING PERSONS Each of the undersigned hereby agrees that Amendment No. 1 to Schedule 13G filed on the date hereof with respect to the shares of Common Stock of Avenue A, Inc. has been filed on behalf of the undersigned....

CUSIP No. 000000000                     13G                  Page 16 of 21 Pages

                                    EXHIBIT A

AGREEMENT OF REPORTING PERSONS

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

Signature:

         Dated: February 14, 2002

         Entities:

Oak Investment Partners VIII, Limited Partnership
Oak Associates VIII, LLC
Oak VIII Affiliates Fund, Limited Partnership
Oak VIII Affiliates, LLC
Oak Management Corporation

                                        By:    /s/ Xxxxxx X. Xxxxxxxxxx
                                               ---------------------------------
                                                   Xxxxxx X. Xxxxxxxxxx, as
                                                   General Partner or
                                                   Managing Member or as
                                                   Attorney-in-fact for the
                                                   above-listed entities

Individuals:

Bandel X. Xxxxxx
Xxxxxx X. Xxxxxxxxx
Xxxxxx X. Xxxxxxxxxx
Xxxxxxx X. Xxxxxx
Xxx X. Xxxxxx

                                        By:    /s/ Xxxxxx X. Xxxxxxxxxx
                                               ---------------------------------
                                                   Xxxxxx X. Xxxxxxxxxx,
                                                   Individually and as
                                                   Attorney-in-fact for the
                                                   above-listed individuals