London-listed operator William Hill has signed sports betting agreements with 11 casinos in Mississippi and another in West Virginia in a major expansion of its presence in the United States.

William Hill will provide its risk management services and proprietary technology for both retail and on-premise mobile wagering to Mississippi's Hard Rock Casino, Palace Casino and Treasure Bay Casino in Biloxi, Island View Casino in Gulfport, and WaterView Casino in Vicksburg, as well as six other undisclosed Mississippi casinos.

William Hill has also agreed a deal with an undisclosed casino in West Virginia, and is in discussions with operators in a further fourteen states about similar sports betting agreements.

Subject to regulatory approval and licensure, all of the Mississippi casinos are expected to go live by the end of August.

Commenting on the US agreements, William Hill chief executive Philip Bowcock said: "It has been an excellent start for us since PASPA was overturned. We have built on our existing business in Nevada which is number one and growing and in Delaware where we are risk manager for the entire state.

"We are now the early market leader in New Jersey where our mobile app will launch within weeks and we expect to be market leader in Mississippi with these eleven casino agreements. The team continue to engage in discussions that cover a further fourteen states and they are doing a tremendous job."

The imminent launch in Mississippi and West Virginia further strengthens William Hill's US operations, which include sports betting in Nevada, Delaware and New Jersey, and a racebook in Iowa.

William Hill US chief executive Joe Asher commented: "We have had a great start in New Jersey and our team is working hard to launch our mobile product there, as well as getting ready to go live in Mississippi, West Virginia and elsewhere, subject to regulatory approval. There is a lot happening and we are very proud of our team."

Shares in William Hill plc. (LSE:WMH) were trading down 9.17 per cent at 265.50 pence per share in London Friday morning following this announcement and publication of the company's results for the first half of 2018.