The market is certainly been acting goofy the last week ...
TSCO (Tescos) the supermarket chain - market cap £25.4b - down 16% on Thu 12-Jan-2012. It reported UK LFL sales down 1.5%.
ISYS (Invensys) the software company - market cap £1.5b - down 21% on Fri 13-Jan-2012. It warned that profits would be signficiantly lower due to contract delays and engineering problems.
CCL (Carnival) the cruise operator - market cap £4.8b - down 19% on opening trade on Mon 16-Jan-2012. One of its ships, Costa Concordia, grounded. The loss is expected to be $85-$95m. A drop of 19% corresponds to a loss in market value of £96m, which is about $146m.
Interesting times. Who's next, I wonder.