Buffett bought Hewlett-Packard last year, with a stake of 11 at one point..4%, after holding for a year, recently began to sell HP shares, according to the purchase price at the time, the current part of the sale has a loss, HP's problems are mainly concentrated in two areas, one is poor earnings, last quarter earnings revenue fell 9.9%, lower than market expectations, while profits fell by 32%; followed by HP's monotonous business structure, still computer-based, due to the current personal PC market saturation coupled with the replacement of smartphones, the outlook is bleak, in fact, the U.S. technology stocks, there are also traditional and new technology stocks trend differentiation, artificial intelligence as a representative of the new technology stocks, and traditional technology without the concept of artificial intelligence, represented by HP, so far underperforming。