Exchange-traded funds tracking homebuilders were among the worst performers of a mixed session Thursday, as traders booked profits on housing stocks that have surged so far this week.

Recently, Hovnanian ( HOV), Toll Brothers ( TOL), D.R. Horton ( DHI), Lennar ( LEN) and Centex ( CTX) were all dropping.

The iShares Dow Jones U.S. Home Construction ( ITB) was down 79 cents, or 3.5%, to $21.73. The SPDR S&P Homebuilders ( XHB) fell 65 cents, or 2.8%, to $22.90.

Oil-related ETFs were also on the decline, as crude continued its multi-session freefall that has lopped nearly 4% off prices. Lately, the November front-month crude contract was shedding 14 cents to $79.80.

The Ultra Oil & Gas ProShares ( DIG) was losing $1, or 0.9%, to $109.18. The iShares Dow Jones U.S. Oil Equipment Index ( IEZ) was down 45 cents, or 0.7%, to $63.99. The Energy Select Sector SPDR ( XLE) slid 44 cents, or 0.6%, to $74.03.

Bundled securities tracking the chip sector were also under pressure, a day after Micron's ( MU) disappointing quarter and Merrill Lynch's bearish coverage of Intel ( INTC), Advanced Micro Devices ( AMD) and Nvidia ( NVDA).

The Ultra Semiconductor ProShares ( USD) eased 89 cents, or 1%, to $86.86. The Semiconductor HOLDRs ( SMH) was down 19 cents, or 0.5%, to $37.97. The iShares S&P GSTI Semiconductor ( IGW) was shedding 36 cents, or 0.5%, to $67.17.

On the other hand, utility-related ETFs were among the few winners. Among individual names, FirstEnergy ( FE), Exelon ( EXC), Entergy ( ETR) and Edison International ( EIX) were all higher.

The Ultra Utilities ProShares ( UPW) was up $1.12, or 1.4%, to $82.44. The Utilities HOLDRs ( UTH) was rising $1.35, or 0.9%, to $147.75. The PowerShares FTSE RAFI Utilities ( PRFU) added 49 cents, or 0.9%, to $58.02.

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