Berkshire Hathaway's red-hot shares are ending a strong week with four consecutive fresh record high closes.
Since the rally began with the start of the fourth quarter on October 1, the Class A shares have closed at record highs 11 times as they soared 19.1%.
The much more widely held B shares closed at new highs just 10 times but are also up 19.1% from their near-term low.
The gains are in sharp contrast to the S&P 500's 1.2% dip as investors appear to be seeing Berkshire as a relatively safe haven amid worries about AI stocks and spending.
Both Berkshire classes were up 3.9% on the week as the S&P advanced by 2.5%, its best week since early August.