Tricia Marwick MSP, the deputy convenor of the standards committee, made her comments as the parliament ended its three-year investigation into the sector.
Last week MSPs agreed commercial lobbyists should only take part in a statutory register rather than tougher regulation including disclosure of fees, both of which Marwick still favours.
Marwick said: 'I do not agree that a statutory registration scheme is enough or that the commercial lobbying organisations are being asked to give enough information.
'They are not being asked to detail the fees that they receive to lobby Parliament on behalf of their clients. That is wrong - fees should be banded. I will lobby members of the standards committee heavily on that issue.'
The decision not to adopt a system of regulation follows extensive lobbying by public affairs groups.