Section 6. No contract to provide consultant services shall be awarded by the commonwealth, or by any department, board, commission or other agency acting in its behalf, unless the persons signing such contract on behalf of the party contracting to provide such services files with the comptroller a statement under the penalties of perjury setting forth the names and addresses of all persons having a financial interest therein, not including, however, any person whose only financial interest consists of the holding of one per cent or less of the capital stock of a corporation contracting to provide such services.