Berkshire Hathaway's operating profit increased by 30% in the previous quarter, with net profit doubling year-on-year, from $18.08 billion last year to $37.574 billion, of which investment and derivative income reached $29.1 billion. It is worth noting that the current cash reserves have risen to a record high of $167.6 billion, an increase of $10.6 billion compared to the third quarter.