Buffett bought HP last year, the proportion of shares once reached 11.4%, after holding a year, recently began to sell HP shares, according to the purchase price at that time, the current part of the loss, HP's problems are mainly concentrated in two aspects, one is poor earnings, last quarter earnings revenue fell 9.9%, lower than market expectations, while profits fell 32%; Secondly, HP's business structure is monotonous, still based on computers, due to the current personal PC market saturation and replacement by smart phones, the prospects are bleak, in fact, in the United States technology stocks, there is also a traditional and new technology stock trend differentiation, artificial intelligence as the representative of the new technology stocks, and traditional technology without the concept of artificial intelligence, represented by HP, so far poor performance.