Check out the companies making headlines after the bell Tuesday:
Alphabet's shares sank briefly in light trading after hours, as the company announced a partnership to build self-driving cars with Fiat Chrysler. The deal will focus on self-driving minivans to be used as test vehicles.
Shares of Under Armour fell in extended trading after the company named a new chief merchandising officer. The athletic wear brand said that Kip Fulks would serve as interim chief merchandising officer as Henry Stafford steps down in July. Michael Lee, co-founder of MyFitnessPal, will also serve as Under Armour's chief digital officer starting in July, replacing Robin Thurston, the company said. There was no reason given for the C-suite shake-up.