This Week's ETF Winners & Losers

Exchange-traded funds tracking the financial sector were among the strongest performers in a wild week that was highlighted by JPMorgan Chase (JPM Quote) setting plans to buy Bear Stearns (BSC Quote) and more attempts by the Federal Reserve to restore the health of the financial markets.

Among the big ETF winners were Ultra Financials ProShares (UYG Quote) and iShares Dow Jones U.S. Financial Services (IYG Quote), which surged 19.3% and 11.8%, respectively, for the week.

The Vanguard Financials ETF (VFH Quote) and the iShares Dow Jones U.S. Financial Sector (IYF Quote) each climbed more than 9%.

Bundled securities tracking oil and gold, however, were among the losers. The Oil Services HOLDRs (OIH Quote) lost 5% for the week, and the PowerShares Dynamic Oil & Gas Services (PXJ Quote) fund gave back 5.3%.

The iShares Dow Jones U.S. Energy (IYE Quote) and the PowerShares DB Energy (DBE Quote) were off 2.9% and 2%, respectively.

As for funds tracking gold, the Market Vectors Gold Miners (GDX Quote) sank 10.8% since Monday. Losing more than 6% were the PowerShares DB Gold (DGL Quote), the iShares COMEX Gold Trust (IAU Quote) and the streetTRACKS Gold Shares (GLD Quote) funds.