This is f*k weird.
YHOO contributes only 1% in NQ and even 20% drag down by YHOO is well offset by even if only 2% jump by MSFT/GOOG which account for >10% in NQ, what r these f*k idiot sellers thinking?
In July 2007 SEC approved change that stocks with 3 letter symbol from NYSE and AMEX are allowed to keep the 3 letter symbol after moving to NASDAQ. Does not apply for 1 or 2 letter symbols.