The safety of directors and employees of Quinn Industrial Holdings (QIH) is "treated with utmost seriousness," said Taoiseach Leo Varadkar.
Kevin Lunney, one of the directors of the Fermanagh County Society, was abducted and tortured on Sept. 17.
He was thrown on a road in County Cavan, Republic of Ireland, 35 km from the place of his abduction.
Mr Varadkar, the Irish Prime Minister, met on Sunday with the five business leaders to assure them of his support.
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Mr Varadkar said he wanted to thank them for their courage, determination and commitment to the company.
He met with the directors after attending a ceremony in Enniskillen for Remembrance Day.
"I wanted to hear their views and assure them of government support for QIH, which employs more than 800 people in Ireland and Northern Ireland, and is an integral part of the community," he said.
"In particular, I wanted to thank Kevin Lunney for his resilience after his barbaric kidnapping, assault and torture."
Varadkar said he had discussed his recent meeting with Irish Police Commissioner Drew Harris and Irish Justice Minister Charlie Flanagan.
"I assured them that their own security, that of their employees, and law and order in the border region are treated with the utmost seriousness at the head of the government," Varadkar said.
"Law and order must prevail and prevail in all parts of the country, and we have agreed to keep in touch as the criminal investigation against the culprits unfolds."
Mr. Lunney, a father of six, had a broken leg, was sliced with a knife and sprinkled with bleach during a two-and-a-half hour test.
The 50-year-old journalist had the letters that QIH sliced into his chest with a knife and told BBC's Spotlight last week that he was afraid he would never see his wife and children again. .
After Sunday's meeting, QIH issued a statement in which he praised Mr. Varadkar's "personal interest" in bringing to justice those responsible for a campaign of terror and intimidation directed against his staff ".
"The company thinks that setting up a joint investigation team is a crucial step and is convinced that the necessary resources and resolution are now in place for an effective investigation," he said. declared.
The main suspect in the investigation of Mr. Lunney's attack died on Friday during a police raid in England.
54-year-old Cyril McGuinness reportedly suffered a heart attack as police raided his home in Derbyshire.
This research was part of a joint police operation conducted in the United Kingdom and Ireland during which nearly 20 properties were raided.
PSNI said it would "continue to work closely" with Garda Síochána (Irish police) and the Derbyshire police to try to "bring those responsible to justice".
Irish Justice Minister Charlie Flanagan said there were already 1,500 police officers in the border region, including three armed police support units.
"I am pleased that an additional 150 officers have been posted to the region over the last two years, following a difficult period of law enforcement following the closure of Templemore College in 2010", did he declare.
The QIH component companies previously belonged to Sean Quinn, who was once the richest man in Ireland.
When his business empire collapsed, businessmen, including his former associates, bought the companies.
Mr. Lunney, who has worked with Mr. Quinn for many years and remained loyal after the bankruptcy of the Fermanagh County Mogul, has been reinstated in his duties as a director and Mr. Quinn has been hired as a consultant.
Mr. Quinn left this role in 2016, later claiming that he had been forced to leave home and that his family had been "stabbed in the back".
He has repeatedly condemned attacks on property belonging to the owners of his former businesses.