Charles Schwab Europe has struck a seven month sponsorship deal with LSsport on behalf of ten of the Rugby Union Premiership's Web sites.
Under the deal, Charles Schwab will advertise on the official club sites, related news stories seen in the breaking news section of each club site homepage, and through each club's regular email news services.
The online broker will start with a special Internet trading promotion where users of each site can start trading with Charles Schwab for 30 days commission free.
Julian Stewart, director for Web site management and design firm, LSsport: "Charles Schwab is a natural partner for rugby fans as three quarters of them own their own shares."