Executives at the two biggest phone companies contributed more than $42,000 in political donations to Senator John D. Rockefeller IV this year while seeking his support for legal immunity for businesses participating in National Security Agency eavesdropping.

The surge in contributions came from a Who’s Who of executives at the companies, AT&T and Verizon, starting with the chief executives and including at least 50 executives and lawyers at the two utilities, according to campaign finance reports.

The money came primarily from a fund-raiser that Verizon held for Mr. Rockefeller in March in New York and another that AT&T sponsored for him in May in San Antonio.

Mr. Rockefeller, chairman of the Senate Intelligence Committee, emerged last week as the most important supporter of immunity in devising a compromise plan with Senate Republicans and the Bush administration.