Following a tough fourth quarter that crushed his company’s net income, Warren Buffett’s portfolio has soared year to date. His stocks, which may not all have completely rebounded from their low points late last year, are enjoying the benefit of a vigorous market to start 2019. S&P 500 constituents rose 14.84% year to date, nearly erasing their fourth-quarter dive. Meanwhile, 45 of Buffett’s 48 stocks have posted gains. The ...