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This Week's ETF Winners & Losers

Basic materials funds are among the best performers.

Exchange-traded funds tracking basic materials were among the best performers of May's first full week following Monday's bid for a potential blockbuster deal between two major industrial concerns.

As the week started, Pittsburgh-based aluminum giant

Alcoa

(AA) - Get Alcoa Corp. Report

said it was launching an effort to buy Canada's

Alcan

(AL) - Get Air Lease Corporation Class A Report

for $27 billion. Alcoa jumped 6.8%, and Alcan surged more than 31%.

The

Ultra Basic Materials ProShares

(UYM) - Get ProShares Ultra Basic Materials Report

ETF added 3.7% to $87. The

iShares Dow Jones U.S. Basic Materials

(IYM) - Get iShares U.S. Basic Materials ETF Report

ETF was higher by 1.7% at $68.93. The

Materials Select Sector SPDR

(XLB) - Get Materials Select Sector SPDR Fund Report

gained 1% to $39.78.

Semiconductor-related ETFs were also among the winners of the week, thanks to positive earnings news out of

Nvidia

(NVDA) - Get NVIDIA Corporation Report

Thursday. Excluding items, the company earned 42 cents a share, comfortably ahead of the Thomson Financial target. The chipmaker also offered a positive second-quarter forecast, and the stock rose 4.2% for the week.

The

Ultra Semiconductor ProShares

(USD) - Get ProShares Ultra Semiconductors Report

ETF climbed 2.5% at $82.89. The

Semiconductor HOLDRs

(SMH) - Get VanEck Vectors Semiconductor ETF Report

added 1.3% to $37.98. The

SPDR S&P Semiconductor

TheStreet Recommends

(XSD) - Get SPDR S&P Semiconductor ETF Report

ETF gained 1% to $53.39, and the

iShares Goldman Sachs Semiconductor

(IGW)

ETF ended higher by 0.8% at $66.16.

On the losing side, the

HealthShares Emerging Cancer

(HHJ)

ETF was the week's largest decliner. Holding

Dendreon

(DNDN)

plummeted 68.5%, most of that after the Food and Drug Administration said it required more test data for the company's drug Provenge.

The HealthShares Emerging Cancer ETF finished the week lower by 16.2% to $22.54.

Gold-related ETFs also declined for the five sessions. Futures ended down 2.5% at $672.30 an ounce. The

streetTRACKS Gold Shares

(GLD) - Get SPDR Gold Trust Report

ETF eased 2.5% to end the week at $66.48. The

iShares Comex Gold Trust

(IAU) - Get iShares Gold Trust Report

closed down 2.5% to $66.52, and the

Market Vectors Gold Miners

(GDX) - Get VanEck Vectors Gold Miners ETF Report

ETF slipped 1.9% to $39.92.

Elsewhere, ETFs tracking silver were among the worst performers. Silver futures fell 1.7% over the five days to close at $13.30 an ounce. The

iShares Silver Trust

(SLV) - Get iShares Silver Trust Report

slid 1.8% to $131.47. The

PowerShares DB Silver

(DBS) - Get Invesco DB Silver Fund Report

ETF shed 1.7% to $26.04.