Thursday's ETF Winners & Losers

Exchange-traded funds tracking the Internet sector were among the top performers of Thursday's session, thanks to solid first-quarter earnings from RealNetworks (RNWK Quote).

The Internet-software maker posted a profit that beat Thomson First Call's average earnings per share target by a nickel. Recently, RealNetworks was jumping 9.4%. Among other names, Amazon.com (AMZN Quote), CNET Networks (CNET Quote), eBay (EBAY Quote) and Checkfree (CKFR Quote) were all higher by 1.5% or more.

The B2B Internet HOLDRs (BHH Quote) was climbing 4 cents, or 2%, to $2.07. The Internet HOLDRs (HHH Quote) was adding 85 cents, or 1.4%, to $60.36. The Internet Infrastructure HOLDRs (IIH Quote) was gaining 4 cents, or 0.8%, at $5.06.

Meanwhile, an earnings beat from Symantec (SYMC Quote) boosted the Internet Architecture HOLDRs (IAH Quote) by 39 cents, or 0.9%, to $45.07.

Telecom HOLDRs (TTH Quote) also was higher, thanks to Centurytel (CTL Quote), which rose more than 4% after beating first-quarter estimates and raising its guidance for the year. The ETF was recently up 45 cents, or 1.2%, to $38.74.

On the losing side, bundled securities tracking oil tumbled due to a drop in crude prices. Recently, the front-month June contract was down 83 cents to $62.85 a barrel. Crude oil prices have now fallen more than 5% since Friday's close.

The iPath Goldman Sachs Crude Oil Index (OIL Quote) ETF eased 33 cents, or 0.9%, to $35.99. The United States Oil (USO Quote) ETF shed 40 cents, or 0.8%, to $49.19. The ProShares DB Oil (DBO Quote) was losing 11 cents, or 0.4%, at $26.15.

The Biotech HOLDRs (BBH Quote) was also among the worst decliners Thursday. Among its holdings, Biogen-Idec (BIIB Quote) was losing 2%, Amgen (AMGN Quote) shed 2% and Shire (SHPGY Quote) dipped 1%.

Recently, the Biotech HOLDRs was lower by $1.58 to $188.84.