Berkshire Hathaway fell only $750 a share today (Tuesday), just under 1 percent, but it's enough for a 5-1/2 year closing low.
At the closing bell, the price of one class A share of Warren Buffett's holding company was priced at $75,000. (The intraday low was even worse: $72,650.)
The last time it closed below $75k was September 17, 2003.
Berkshire shares have now dropped 49.7 percent from their all-time closing high of $149,200 on December 10, 2007.
They're down 17 percent from the near-term closing high of $90,400 just 14 trading days ago, on February 11.