CEOs at the country’s largest publicly traded companies may not have been big supporters of Donald Trump during his campaign. But in the three months since the election, many are surely happy to see that the value of their personal holdings of company stock has grown — and substantially so, in some cases.According to a newly released analysis by Equilar, the executive pay and board data firm, the total stock ownership value held by Dow 30 CEOs in their companies rose nearly $402 million between Election Day and Feb.