Britain's largest manufacturing concern, the General Electric Company, vowed today to fight a takeover bid estimated at $12 billion that an international consortium is apparently trying to put together.

At the time, the London exchange was fighting a hostile takeover bid from the O.M. Group of Sweden, which runs the Stockholm exchange.

In 1975, Mr. Keith fought a hostile takeover bid by the Tesoro Petroleum Corporation.

The casino operator, which is fighting a takeover bid, on Sunday announced a billion-dollar recapitalization plan in which it would pay a special cash dividend of $25 a share to shareholders.

Irving is fighting a hostile takeover bid from Bank of New York.

His biggest winner, Willamette Industries, up 68.4 percent, is fighting a takeover bid by Weyerhaeuser.

Hecco waged a proxy contest that sought seats on the board of Valley Federal, which has been fighting a $107 million takeover bid from the Citadel Holding Corporation.

Fruehauf has been trying to retire some of the debt it contracted while fighting a takeover bid in 1986.

NCR, which is fighting a $90-a-share takeover bid from A.T.&T., jumped 6 1/8, to 92 3/4.

The Universal Foods Corporation, which successfully fought a hostile takeover bid last year, tentatively agreed to sell its cheese division to the unit's management.