Close Brothers Group PLC (LSE:CBG) shares rocketed 25% to 500p after the Supreme Court ruling on its motor finance appeal at the end of last week.
The judgment largely overturned a previous Court of Appeal ruling on car finance that had the potential to lead to large compensation payouts.
The UK's highest court ruled that in many cases commission payments could be legal, but some lenders did act unfairly due in part to the size of the commission they paid to motor dealers and how it was disclosed.
On Sunday, the FCA confirmed its previous proposal for a redress scheme, with a consultation to be launched on discretionary commission arrangements (DCA) and to decide which non-DCA arrangements and other factors should be included.
The FCA said it "wants to ensure the integrity of the motor finance market so it works well for consumers now and in the future".
Close Bros said in its own follow-up statement on Sunday that there "Until the FCA confirms whether it will consult on a redress scheme and, if so, confirms the design and scope of that scheme, there remains uncertainty as to the range of outcomes, and the financial impact to the group, including any impact on its provisioning assessment".
Alongside that, it said, management are continuing to "assess the impact of the principles set out in the Supreme Court’s judgment on its motor finance loan portfolio".
Following confirmation of its consultation on compensation scheme, Close Bros said in a separate statement on Monday only that it "look[s] forward to engaging with the FCA in respect of the consultation".