Syngenta who? News that Bayer AG may be weighing a bid for Monsanto Co. sent its U.S. competitor -- the world’s biggest seed company -- to the highest level since the end of 2015. Monsanto, which in March was said to explore crop-science deals with both Bayer and BASF SE after its bid for Syngenta AG was spurned last August, rose as much as 11.6 percent to capture the leading mover spot in the S&P 500 Index.
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