Nikola Motor Firm Two truckSource: Nikola Motor CompanyCheck out the businesses making headlines after the bell: Nikola — Shares of Nikola fell about 1% in prolonged buying and selling, including to steep losses on Monday. The decline got here after Nikola founder and govt chairman Trevor Milton introduced his resignation in a single day. Milton’s departure follows quick vendor Hindenburg Analysis’s report accusing him of making false statements in regards to the firm’s know-how to draw buyers and partnerships with different automakers. Milton agreed to forfeit as much as roughly $166 million of fairness in addition to a two-year, $20 million consulting contract as a part of his abrupt departure.Comcast — Shares of Comcast gained sightly in after-hours buying and selling after Trian Fund Administration took a stake within the cable large. The hedge fund purchased 7.16 million class A typical share of Comcast, a regulatory submitting confirmed. “Trian believes Comcast’s stock is undervalued. We have now not too long ago begun what we consider are constructive discussions with Comcast’s administration workforce and stay up for persevering with these discussions,” a Trian spokesperson informed CNBCRoku — Shares of Roku rose barely in extending buying and selling, constructing on its current momentum. The streaming video firm jumped greater than 17% on Monday to hit an all-time excessive after placing a cope with NBCUniversal, CNBC’s dad or mum firm, which can make NBC’s Peacock streaming service accessible on Roku gadgets. Comcast CEO Brian Roberts stated final week that the brand new streaming service has 15 million sign-ups.Carnival, United Airways — Shares of airways and cruise operators rebounded barely in prolonged buying and selling after huge losses. These stocks had been amongst Monday’s greatest laggards as fears of a worsening coronavirus pandemic weighed on sentiment. Carnival gained 0.8% after dropping 6.6%, whereas United Airways rose 0.9% following a 8.6% decline. Disclosure: Comcast is the proprietor of NBCUniversal, dad or mum firm of CNBC.