A Republican congressional candidate owns a stake in a French-Swiss cement company accused of making payments to the Islamic State militant group in Syria, according to financial disclosures HuffPost reviewed.

Greg Gianforte, the millionaire GOP contender for Montanas open seat in the House, reported owning $47,066 worth of shares in LafargeHolcim as recently as December. The shares are in an individual retirement account at TWP, a brokerage firm and private wealth manager, on which he and his wife, Susan Gianforte, are listed as trustees.

LafargeHolcim operated a factory in the north Syrian town of Kobane for three years after civil war broke out and most foreign companies fled. The company evacuated foreign employees in 2012, but kept the business going with local workers until ISIS fighters seized the factory two years later. Payments made to local armed groups to secure the factory may have unwittingly ended up in ISIS coffers, French newspaper Le Monde reported last year. CEO Eric Olsen resigned from the firm last month.