Rapperswil-Jona/Zurich-One of the largest transactions in the building materials industry in recent years is under the roof and subject. The cement group Holcim has completed the split off of the North America business Amirizen, as the Swiss company announced on Monday. The trade in Amiriz shares begins at 9:00 a.m. CEST at SIX Swiss Exchange and at 9:30 a.m. New York time at the New York Stock Exchange.