The iShares Goldman Sachs Networking ( IGN) exchange-traded fund was the biggest loser Monday, shedding nearly 3% of its value. Of the fund's top 10 holdings, nine were on the downside. Corning ( GLW) was down $1.37, or 6%, to $20.78; Marvell Technology ( MRVL) was trading down $2.38, or 5.7%, to $39.35; and Cisco Systems ( CSCO) was trading off 47 cents, or 2.4%, to $18.92. The Goldman Sachs Networking ETF was recently trading down 84 cents to $27.93. The iShares Dow Jones U.S. Industrial ( IYJ) ETF moved slightly higher ahead of the unofficial start of earnings season. After the bell, Alcoa ( AA) posts its second-quarter results. Analysts polled by Thomson First Call project earnings of 86 cents a share on revenue of $8.01 billion. On Friday, General Electric ( GE) is scheduled to release its second-quarter earnings. Shares of the ETF were recently trading up 5 cents to $61.28. Weakness in semiconductor stocks sent shares of the Merrill Lynch Semiconductor HOLDRs ( SMH) ETF about 2% lower. Big losers in the ETF included SanDisk ( SNDK), which was down $3.09, or 6.5%, to $44.36; and Advanced Micro Devices ( AMD), which was lower by 91 cents, or 3.9%, to $22.65. The chip ETF was trading down 68 cents to $31.12. After taking a hit last week because of worries about North Korea's missile launch, several Pacific Rim ETFs were on the upswing Monday. The iShares MSCI Japan Index ( EWJ) was trading up 19 cents, or 1.4%, to $13.67. The iShares MSCI Taiwan Index ( EWT), meanwhile, was up 19 cents, or 1.5%, to $12.61.