The proposed merger between Holcim and Lafarge will create world's largest cement, concrete and aggregates company with presence in 90 countries, although no nation will account for more than 10 per cent of the combined revenues.
Holcim and Lafarge, with combined sales of 32 billion euro, said the merger plan was unanimously approved by their Boards and fully supported by their core shareholders.
"The proposed merger would enable optimised capital allocation across the expanded footprint and strong cash-flow generation and the robust balance sheet that will provide financial strength," the two firms said in a joint statement.
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"The new global company would deliver compelling benefits for all stakeholders. LafargeHolcim would be in best position to contribute to addressing the challenges of urbanisation - affordable housing, urban sprawl and transport," it said.
LafargeHolcim will have enhanced presence in the global building materials sector with number one position worldwide across cement, concrete and aggregates and new opportunities to optimise production and commercial networks, it added.
"After a strategic optimisation of the portfolio through a pro-active divestment process, in anticipation of regulatory requirements, LafargeHolcim would occupy complementary positions," it said.
LafargeHolcim will be listed on the SIX in Zurich and Euronext Paris.
The board will be composed with equal numbers of Lafarge and Holcim directors and through an efficient distribution of central corporate functions in France and Switzerland.
"The proposed combination would be structured as a public offer filed by Holcim for all outstanding shares of Lafarge on the basis of a 1 for 1 exchange ratio with an agreement to have equal dividends on a per share basis between announcement and completion," it said.
The deal is likely to be closed in the first half of 2015.