By Rob Hanna
As I write this around 11am EST both NFLX and CELG are threatening to close up > 50% from their December 24th closing price, just 14 trading days ago. While that sometimes happens with speculative smallcap stocks, it is very unusual to see a largecap S&P 100 stock accomplish such strong gains in such a short period of time. In fact, the last instance of a 50% close to close gain within 15 days for an S&P 100 stock occurred in 2009. I looked back at other times since 2000 where it has occurred among S&P 100 components, and found only 38 occurrences. Below is the complete list.