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This Week's ETF Winners & Losers

Health-care and biotech ETFs performed well this week.

Health-care and biotechnology exchange-traded funds were among the best performers in the ETF world this week, thanks to positive action from





(MRK) - Get Free Report


On Thursday, MedImmune jumped 15.3% after it indicated the possibility of a sale of the company. On Friday, Merck jumped 8.3% after lifting its full-year earnings-per-share forecast by 20 cents.


Pharmaceutical HOLDRs

(PPH) - Get Free Report

ETF was higher for the week by 3.8%, closing at $82.71. The

HealthShares Emerging Cancer


added 1.2% over the five sessions to end at $27.13.

ETFs tracking metals and mining were also among weekly winners. Gold futures gained roughly 1.5% over the five sessions to close at $689.90 an ounce, and silver futures rose 2.5% to end at $14.09 an ounce.

For the week, the

iShares Silver Trust

(SLV) - Get Free Report

was higher by 2.4% to close at $139.90. The

streetTRACKS Gold Shares

(GLD) - Get Free Report

ETF added 1.5% to $67.84. The

iShares Comex Gold Trust

(IAU) - Get Free Report

tacked on 1.4% to $67.91.


iShares Dow Jones Transportation Average

(IYT) - Get Free Report

ETF was another of the week's winners. On Monday, rail concern

Burlington Northern Santa Fe


jumped after a

Securities and Exchange Commission

filing stated that billionaire investor Warren Buffett's

Berkshire Hathaway

(BRK.A) - Get Free Report

had purchased a 10.9% stake in the company, making it the largest shareholder.

The ETF, which was also aided by lower crude prices for the week, rose $2, or 2.3%, to $90.10.

However, the decline in crude prices weighed on energy-related ETFs. The May crude contract finished a very volatile five-day stretch lower by 1% at $63.63 a barrel. The

United States Oil

(USO) - Get Free Report

ETF was lower by 0.9% to $51.52. The

iPath Goldman Sachs Crude Oil Index

(OIL) - Get Free Report

eased 0.6% to $37.75.

Among other decliners, the

B2B Internet HOLDRs


ETF was lower due to rating changes. Holding



sank 3.8% for the week after JMP Securities downgraded the stock Wednesday to market perform from strong buy. The ETF was off 0.9% to finish the week at $2.14.