Shares of Monsanto advanced 4.4 percent Monday after German firm Bayer offered to buy the company for $62 billion in cash.
Bayer made the offer Monday morning after multiple recent reports linked the two firms.
Monsanto's stock has gained more than 7.5 percent in 2016, but has fallen more nearly 12 percent over the past year.
MON 12-month performance
Bayer's U.S. listed shares fell more than 5 percent.