John Deere combine harvesters sit on display during the Farm Progress Show in Boone, Iowa, U.S., on Tuesday, Aug. 28, 2018.

Check out the companies making headlines in midday trading.

DeereDeere's stock dropped 4.5% as the worst performer among the S&P 500 companies after the manufacturing company issued lower guidance citing "lingering trade tensions." The company now expects net income of $2.7 billion to $3.1 billion in fiscal 2020, lower than average analyst estimates of $3.5 billion for the year, according to Refinitiv. Deere CEO said trade tensions are slowing equipment purchases by farmers.