A man from Guildford, England stands to earn the highest individual payout after he wagered 75 pounds at 1,500-1 just a few weeks into the campaign, it said. He has not cashed out and so now stands to win 112,500 pounds.
In total, William Hill face a final payout of a little over three million pounds if Leicester beat Manchester United at Old Trafford on Sunday.
"We stand to lose a small fortune if Leicester do what everybody must now be expecting them to do. 5,000-1 is the biggest priced winner in betting history!" William Hill spokesman Joe Crilly said.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
($1 = 0.6874 pounds)
(Reporting by Shravanth Vijayakumar in Bengaluru; Editing by Mark Heinrich)
