Monday's ETF Winners & Losers

Exchange-traded funds tracking the real estate and housing sector were among the worst performers Monday, after a Federal Reserve official offered a bearish outlook for the sector.

San Francisco Fed President Janet Yellen told the National Association for Business Economics that the recent financial market turmoil will prolong the housing sector adjustment. Vornado Realty Trust (VNO Quote) and ProLogis (PLD Quote) were both lower by more than 1%.

The Ultra Real Estate ProShares (URE Quote) was falling 72 cents, or 1.7%, to $41.52. The First Trust S&P REIT (FRI Quote) ETF was down 69 cents, or 3.9%, to $17.11. The SPDR Dow Jones Wilshire International Real Estate (RWX Quote) was off by $1.32, or 2.2%, to $58.63.

Homebuilders and construction were also under pressure. D.R. Horton (DHI Quote), Lennar (LEN Quote), Hovnanian (HOV Quote), Toll Brothers (TOL Quote) and Beazer Homes (BZH Quote) all slid by 2.4% or more.

The PowerShares Dynamic Building & Construction (PKB Quote) lost 48 cents, or 2.5%, to $1.71. The SPDR S&P Homebuilders (XHB Quote) was down 33 cents, or 1.4%, to $22.91. The iShares Dow Jones U.S. Home Construction (ITB Quote) shed 24 cents, or 1.1%, to $21.75.

Basic materials-related ETFs were also lower. Among individual stocks, Alcoa (AA Quote), Nucor (NUE Quote) and Freeport-McMoRan (FCX Quote) were losing 1% or more.

The Ultra Basic Materials ProShares (UYM Quote) eased $2.37, or 2.9%, to $79.36. The iShares Dow Jones U.S. Basic Materials (IYM Quote) was off 76 cents, or 1.1%, to $67.15. The Vanguard Materials (VAW Quote) was down 98 cents, or 1.2%, to $80.07.

There were few winners during Monday's losing session. The United States Natural Gas (UNG Quote) ETF was rising 3.6% as natural gas tacked on 18 cents to $5.68 per million British thermal units. The ETF was up $1.23 to $35.57.