The European Commission has launched an investigation in Kingspan's planned takeover of a Slovenian company.
The Kingscourt based company plans to acquire Trimo, a competitor in the building materials sector.
Its main markets are in eastern Europe, Scandinavia and the UK and France.
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The European Commission has launched an investigation after concerns over a lack of competition in the sector if the merger goes ahead.
It has until mid-August to complete its investigation.