Even Wall St. was paying close attention to Jordan Spieth's Monday finish at the British Open. Under Armour, who represents Spieth's most visible endorsement deal, saw its stock fall in the minutes after Spieth finished a shot out of what turned out to be a three-man playoff at St. Andrews between 2010 Old Course winner Louis Oosthuizen, Zach Johnson and Marc Leishman.
However, it was Spieth's bogey at the Road Hole 17th that sent Under Armour's stock down from almost $89.50 down beneath the $89 mark.
The stock held at that price as Spieth finished up, ending the hopes for the first modern single-season Grand Slam.
After Spieth won the Masters on April 12, Under Armour stock went up $1.36 on the Monday after the major breakthrough. The stock jumped another $1.62 on the Monday after Spieth won the U.S. Open at Chambers Bay.