Monday's ETF Winners & Losers

The

HealthShares Emerging Cancer

(HHJ)

exchange-traded fund was higher to start the week. Holding

Dendreon

(DNDN)

, which has tripled since late March after the Food and Drug Administration endorsed the company's Provenge prostate cancer vaccine treatment, was climbing another 25%. The ETF was recently up $1.38, or 5.1%, to $28.38.

The

iShares Dow Jones Transportation Average

(IYT) - Get Report

was another of the session's winners. Rail concern

Burlington Northern Santa Fe

(BNI)

jumped after a

Securities and Exchange Commission

filing stated that billionaire investor Warren Buffett's

Berkshire Hathaway

(BRK.A) - Get Report

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

The ETF was rising by $2.01, or 2.3%, to $90.11.

On the flip side, bundled securities tracking the energy sector were among the worst performers of the day. The front-month May crude contract fell $1.19 to $63.09 a barrel.

The

iPath Goldman Sachs Crude Oil Index

(OIL) - Get Report

ETF eased 2% to $37.22. The

United States Oil

(USO) - Get Report

ETF was recently down 1.9% to $51.04. The

PowerShares DB Oil

(DBO) - Get Report

ETF was recently lower by 1.7% to $26.14.

The

Biotech HOLDRs

(BBH) - Get Report

ETF was also losing ground. Holdings

Amgen

(AMGN) - Get Report

and

Genentech

(DNA)

fell 1%, and Biotech HOLDRs was recently lower by $1.36, or 0.8%, to $178.99.