Richard Forrest, Lee Stewart and Howard Hill admitted illegally obtaining confidential information from both the east London club and Olympic Park Legacy Company, with Hammers vice-chairman Karren Brady among those targeted.
Forrest, 31, of Crawley, was fined 10,000 pounds; Stewart, 40, of Esher, ordered to pay 13,250 pounds and Hill, 59, of Stockport, ordered to pay 100,000 pounds.
Southwark Crown Court, in London, was told Brady’s mobile phone bills had been accessed by a private investigator.
Prosecutor Mark Dennis said that happened after Tottenham Hotspur, a competing bidder, had commissioned an accountancy company to look at the bidding process.
Dionne Knight, the Olympic Park Legacy Company project director, was one of nine other people who were spied on.
Judge Alistair McCreath, Recorder of Westminster, said the three men had “by various devious strategies... accessed emails, phone records, bank records and in one case details of where the child of one of your victims went to school."
"It hardly needs stating that you had no right to any of this information," he told them.
Forrest, Stewart and Hill pleaded guilty to a charge of obtaining personal data contrary to Section 55 of the Data Protection Act 1998.