Citadel Investment Group takes 5% stake in QLogic  Published:
Mar 6, 2013 11:07 a.m. ET       Try premium service for free.  A
13G filed with the SEC has reported that Citadel Investment
Group, which is managed by billionaire Ken Griffin, owns a total
of 4.6 million shares of QLogic QLGC, -0.70% a semiconductor
product designer with a market capitalization of $1 billion.
This gave Citadel ownership of 5% of the total shares
outstanding. Citadel Investment Group's biggest bet at the end
of the fourth quarter was a $5.5 billion call position in Apple
Inc AAPL, +1.77% (see more stock picks from billionaire Ken
Griffin).  13G filings have both advantages and disadvantages
compared with quarterly 13Fs: 13Fs provide a much more
comprehensive picture of what a hedge fund owns, as opposed to
13Gs which are only filed when the fund has a large ownership
stake (which is extremely rare in the case of large-cap
companies). As a result they are well suited for the development
of investment strategies; for example, we have