The majority of shareholders in support services company Siteserv has voted to accept a takeover proposal from Millington, worth €45m.
Millington is controlled by businessman Denis O'Brien.
The deal had been subject to controversy because a French company called Altrad claimed it had tried to buy Siteserv for a higher price.
The company said that 99.87% of votes cast were for the motion, while 0.13% of votes cast were against.
Earlier, the support services group said it has received an indicative, non-binding proposal from French group Altrad to buy the company's subsidiaries for €60m.
Siteserv said this proposal was received after its announcement on April 3 which stated that it had not received an formal approach from Altrad. This was contrary to media speculation.
Siteserv said that despite the Altrad offer, it was going ahead with today's EGM and would maintain its recommendation of the Millington deal.
''The board has unanimously concluded that, based on its clear legal and financial advice and the board's commercial assessment of Altrad's non-binding indicative proposal, it should proceed with the extraordinary general meeting scheduled for today and maintain its recommendation of the Millington transactions,'' today's statement from Siteserv said.
The group employs 2,300 people, about 900 of whom work in the Republic.