By John Revill and Saurabh Chaturvedi

ZURICH--Swiss cement maker Holcim Ltd (HOLN.VX) Wednesday said it was reorganizing its Indian operations to offset sluggish growth in the country's building sector, a move that will generate savings of up to $150 million a year.

Under the deal, Holcim will give up the 50.01% it holds in ACC Ltd. (500410.BY) to Ambuja Cements Ltd. (500425.BY). In return, the Zurich-based company will increase its stake in the latter company to 61.39% from 50.55% and receive $600 million in cash from Ambuja.

India is Holcim's biggest market, making up around a third of its total sales.

Sales growth there was below expectations last year as the market faced a slow restart after the monsoon, while slower economic development has also taken its toll.

Holcim entered into partnership with Ambuja Cement in 2005 to acquire a majority stake in ACC and a year later acquired a majority in Ambuja Cement.

ACC and Ambuja will continue to operate as separate brands in India, with separate management and routes to market, Ambuja said.

Annual savings of around $150 million will come from shared logistics and supply chains, as well as reducing fixed costs by sharing functions like human resources and IT, the company added.

A slowdown in the Indian market prompted the move, a company executive said.

"In these times, we need every possible cost saving we can achieve," Onne Van Der Weijde, managing director of Ambuja Cements told a conference call with reporters. "If you cannot get external growth, then you look internally."

In the first three months of this year, ACC and Ambuja Cements sold less cement, particularly in the northern and southwestern parts of the country, Holcim said in April, with cement and clinker volumes 3.7% lower compared with the year earlier.

Write to John Revill at john.revill@wsj.com

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