Monday's ETF Winners & Losers

Exchange-traded funds tracking homebuilders and REITs were all falling hard for a second straight session Monday, as investors continued to fret about the health of credit markets.

Shares of American Home Mortgage (AHM Quote) slid 36% before the stock was halted following word the company has filed for bankruptcy protection. On Friday, American Home Mortgage said it would slash roughly 90% of its work force.

Among REIT-related ETFs, the iShares FTSE NAREIT Mortgage REITs (REM Quote) was dropping $2.04, or 6.4%, to $30.07. The Ultra Real Estate ProShares (URE Quote) gave back $1.53, or 3.8%, to $38.88. The SPDR Dow Jones Wilshire International Real Estate (RWX Quote) ETF was tumbling 84 cents, or 1.4%, to $59.05.

Homebuilders were feeling the crunch as well. Standard Pacific (SPF Quote) was diving by 19%, while Beazer Homes (BZH Quote), Centex (CTX Quote), Hovnanian (HOV Quote) and Meritage Homes (MTH Quote) were losing 3.5% or more.

The iShares Dow Jones U.S. Home Construction (ITB Quote) was shedding 85 cents, or 3.4%, to $24.30. The SPDR S&P Homebuilders (XHB Quote) was lower by 77 cents, or 3%, to $24.73.

Energy-related ETFs were also getting crushed as the September front-month crude contract slid $2.18 to $73.30 a barrel. The Ultra Oil & Gas ProShares (DIG Quote) was giving back $2.56, or 2.9%, to $85.76. The SPDR S&P Oil & Gas Equipment & Services (XES Quote) slid $1.19, or 3.4%, to $34.20. The PowerShares Dynamic Energy (PXI Quote) was lower by $1.09, or 3.4%, to $30.69.

On the flip side, bundled securities tracking the health care sector were among few winners to start the week. Before the opening bell, UnitedHealth (UNH Quote) raised its guidance for 2007 following a favorable Medicare adjustment. The stock was recently up 2%.

The Ultra Health Care ProShares (RXL Quote) was higher by $1.06, or 1.6%, to $67.18. The iShares Dow Jones U.S. Healthcare Provider (IHF Quote) was up 81 cents, or 1.5%, to $56.56. The Health Care Select Sector SPDR (XLV Quote) tacked on 46 cents, or 1.4%, to $34.14.