For the deal to close, shareholders representing 75% of Cooper Industries stock will need to approve the transaction. T. Rowe Price Group is Cooper Industries' largest shareholder with a 10%-plus stake in the Ireland-based company. Asset managers Barrow Hanley and Vanguard Group are also large shareholders with stakes of 7.8% and 5.4%, according to Securities and Exchange Commission data compiled by Bloomberg.

At closing, Cleveland-based Eaton will incorporate in Ireland, where Cooper Industries is headquartered, in a move that the company said may wrench out millions in tax savings.

After the Eaton and Pfizer/Nestle deals, El Paso's ( EP) sale of its exploration unit to private equity fund Apollo Global Management ( APO) and Yahoo!'s ( YHOO) $7.1 billion sale of half of its Alibaba stake, in a deal announced late on Sunday, are the largest M&A transactions involving U.S. companies year-to-date.

In a statement, Eaton said it has secured a $6.75 billion fully underwritten bridge financing commitment from Morgan Stanley and Citigroup to finance the cash portion of the deal.

-- Written by Antoine Gara in New York

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