British betting companies are under coming pressure to help tackle a funding shortfall for Gamble Aware.
The UK charity said it would begin to identify donors next year, meaning operators not on the list might be identifiable by their absence.
The tactic is being introduced after Gamble Aware fell £5m short of its £13m industry contributions target last year.
“We cannot understand [the drop in contributions] and find it pretty inexplicable given the attention being paid to gambling-related harm. It is a huge risk to the industry,” chair Kate Lampard said.
Although there is no legal requirement on how much is donated, the charity recommend 0.1 percent of the total amount staked with a company.