What are the Trumpiest firms? One way to answer the question is by looking at companies in the president’s orbit, such as Tesla, owned by Elon Musk, his billionaire adviser, or the eponymous Trump Media & Technology Group. Another way is to look at firms that saw their prices surge the day after Donald Trump’s election victory, when the biggest gainers included Palantir, a defence contractor; Apollo Global Management and Capital One, two financial giants; and yes, Tesla.