Exchange-traded funds related to financials were the worst performers of a losing week following several disappointing quarterly reports.

Over the course of the week,

Citigroup

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,

Wells Fargo

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,

Bank of America

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and

Washington Mutual

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, among others, were out with lackluster earnings reports. Each fell by at least 8%.

The

Ultra Financial ProShares

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ETF tumbled 14.3% to $52.10. The

iShares Dow Jones U.S. Broker-Dealers

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ETF was lower by 6.9% to $51.32. The

KBW Bank

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ETF lost 6.8% to $49.54.

ETFs tracking homebuilders were also among the worst decliners as concern from the

Federal Reserve

, weak economic data and an earnings warning joined to sink the sector. Late Monday, Fed Chairman Ben Bernanke was out with negative comments, saying that "the further contraction in housing is likely to be a significant drag on growth in the current quarter and through early next year."

On Tuesday, homebuilder

D.R. Horton

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said that fourth-quarter net sales were nearly halved to $1.3 billion from a year ago due to cautious buyers and a tough housing environment.

The news got worse on Wednesday, when the Census Bureau said that housing starts plummeted 10.2% last month to a 14-year low. Building permits tumbled 7.3% to 1.22 million, also below expectations.

For the week, the

iShares Dow Jones U.S. Home Construction

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ETF sank 10.7% to $19.40. The

TheStreet Recommends

SPDR S&P Homebuilders

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ETF shed 9.9% to $20.72.

Retail-related ETFs also finished with losses for the week. Among individual names,

Wal-Mart

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,

Lowe's

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,

Home Depot

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,

Target

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and

Amazon.com

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were all lower by 2.8% or more.

The

SPDR S&P Retail

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ETF ended down 7.8% to $37.38. The

PowerShares Dynamic Retail

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ETF eased 6.3% to $17.11. The

Retail HOLDRs

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fell 5.5% to $96.48.

On the other hand, energy-related ETFs were among few winners as crude set multiple records during the week. The November benchmark contract broke the $90-a-barrel level, adding 5.9% over the course of the week to close at $88.60.

The

United States Oil

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added 4.9% to $67.14. The

iPath S&P GSCI Crude Oil Index

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ETF finished up 4.9% to $49.71.