BASF (BASFn.DE) booked a 900 million euros ($1.2 billion) pre-tax gain from the sale of its stake in German potash miner K+S (SDFG.DE), putting weight behind its plan to exit the nitrogen fertiliser business. Shares of K+S were headed for their biggest one-day slump in almost two years after former parent BASF, the world's top chemicals group by sales, hived off its stake of about 10 percent in the company. Shares in K+S lost as much as 9.3 percent to 49.20 euros on Friday, the worst one-day percentage drop since June 2009, after BASF placed its 19.7 million shares with institutional investors at a price of 50 euros apiece.
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