JPMorgan analyst Sarah DeWitt views Berkshire Hathaway as one of the best value plays in her coverage group. Although the stock appears more expensive than the S&P 500 at 20 times 2019 estimated earnings, reported earnings ignore the company's "massive" equity portfolio of nearly $200B, DeWitt tells investors in a research note. The analyst thinks a better measure is look-through earnings, which she notes is the one Warren Buffett endorses and includes Berkshire's share of retained earnings of major investees that are not reflected in GAAP earnings. On this basis, Berkshire trades at 13.6 times estimated 2019 look-through earnings, near the all-time historical low for price-to-look-through earnings ratio and a significant discount to the S&P 500 at 16 times, the analyst says. She thinks Berkshire should trade at least in line with the historical median on look-through earnings of 17 times, which would imply 25% upside. The analyst keeps Overweight rating on both of Berkshire's share classes. DeWitt has a $375,000 price target for the class A shares (BRK.A) and $250 target for the class B shares (BRK.B).