13Gs - Ziff Asset Shows 8.8% Stake in Beazer (BZH); Citadel Raises Stake in AirTran (AAI) to 5.6%

Slow day so far for 13Ds, but here are a couple of interesting 13G filings (passive investors):

In a 13G filing after the close on Beazer Homes USA Inc. (NYSE: BZH), Ziff Asset Management disclosed an 8.8% stake (3.47 million share) in the homebuilder. Ziff Asset Management is affiliated with Ziff Brothers Investments L.L.C., which is run by the heirs to the Ziff-Davis publishing empire.

In a 13G filing this morning on AirTran Holdings, Inc. (NYSE: AAI), Citadel LP disclosed a 5.6% stake (5,104,092 shares) in the company. This is up from the 767,747 share stake the firm held for the quarter ended December 31, 2006.AirTran is a leading low-fare airline. AirTran has unsuccessfully been trying to buy rival Midwest Air Group (AMEX: MEH). Started by market-guru Kenneth Griffin in his Harvard dorm room in 1987, Citadel has become one of the world's largest hedge funds.