Clonmel-based engineering firm Kentz began trading on the AIM market of the London Stock Exchange this morning.
The placing raised £66.7 million before expenses, of which £18.8 million was raised by the company. The placing price was 115p per share.
The company is valued at £133.8 million.
Kentz CEO Hugh O'Donnell said: "We believe that being a publicly traded company will allow us to consolidate the hard work and investment in the business over the recent years and enable us to further our position in the engineering and construction marketplace."