According to foreign media reports, Apple Inc's share price has not performed well since October, and its market value has shrunk by 260 billion US dollars. As a result, the market value of Buffett's Apple Inc stock has also shrunk significantly.

Apple Inc shares closed at $170.95 on Thursday, down $54.79 from the close of $225.74 on the last trading day of September, down more than 24% since October and a market capitalization of $260 billion in less than three months.

The poor performance of Apple Inc's share price since October has also affected the book income of Buffett, the god of shares, in investing in Apple Inc.

Buffett's Berkshire Hathaway has increased its stake in Apple Inc to 252478779 shares after increasing its stake by 520000 shares in the third quarter, according to filings with the Securities and Exchange Commission on Nov. 14.

Buffett's Apple Inc shares have a market capitalization of $43.16 billion at Thursday's closing price, while Apple Inc's shares have fallen $54.79 since October, meaning their holdings in Apple Inc have lost $13.83 billion in market value.

Although the market value of its holdings of Apple Inc shares has shrunk significantly since October, Berkshire Hathaway may not have lost money on Apple Inc shares because of its 130 million shares in Apple Inc shares. It was bought between the first half of 2016 and the first quarter of last year, and during this period, the highest price of Apple Inc stock was only 144.5 US dollars. More than 100 million shares were bought in the fourth and first quarter of last year, during which Apple Inc's share price was no more than $10, although it was higher than Thursday's closing price, and the share price was significantly higher than Thursday's close of $170.95. It is only in the third quarter of this year, but Berkshire Hathaway has not bought much Apple Inc shares during this period.