iaa inc iaa shares rallied 92 in premarket trades monday after ritchie bros auctioneers inc rba rba said it agreed to buy the westchester illbased online marketplace for 73 billion iaa shareholders will receive 10 in cash and 05804 shares of ritchie bros common stock for each share of iaa common stock they own the deal values iaa at 4688 per share a 19 premium to its closing share price on friday the boards of directors of both companies have approved the transaction unanimously ritchie bros ceo ann fandozzi said the deal accelerates our journey to become the trusted global marketplace for insights services and transaction solutions shares of industrial auctioneer ritchie bros are up 18 in 2022 compared to a 209 drop by the sp 500 spx 