Nikola Corp's shares are trading lower by 1.98% to $2.47, potentially due to profit-taking after a 79% rally over the past five sessions. The stock's recent strength is attributed to its popularity among high short interest stocks. Nikola's stock surged last week following the announcement of an agreement with BayoTech, which includes the acquisition of up to 50 Nikola Class 8 fuel cell electric vehicles over five years.