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In page Wimbledon Championships:

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The All England Club, through its subsidiary The All England Lawn Tennis Ground plc, issues debentures to tennis fans every five years to raise funds for capital expenditure. Fans who invest thus in the club receive a pair of tickets for every day of the Wimbledon Championships for the five years the investment lasts.[5] Only debenture holders are permitted to sell on their tickets to third parties and demand for debentures has increased in recent years, to such an extent that they are even traded on the London Stock Exchange.[citation needed]