First, the figure is 9,000 lobbyists, not 9,000 companies. An organization can have more than one lobbyist.
The Lobbying Act requires companies to disclose the funding provided by various levels of government, from federal to provincial to municipal.
That said, they aren't required to disclose the funding received for lobbying purposes, for example. This came up in one of my recommendations, because the provinces have this requirement. However, there currently isn't any obligation to disclose this.
I don't need this information for an investigation. I don't think that I've ever had to ask for it.