U.S. semiconductor stocks are attracting more cash than ever amid increasing demand for more complex computer chips in everything from wristwatches to cars.

Exchange-traded funds that buy semiconductor shares have absorbed almost $350 million in 2014, the most on record and the first inflows in five years, according to data compiled by Bloomberg. The iShares PHLX Semiconductor ETF has rallied 21 percent this year and has seen its assets almost double.

The rally in computer-chip makers has created more demand for bullish options. Intel Corp. (INTC) calls that pay should the shares rally 10 percent cost 2.7 points less than bearish puts, according to data on three-month contracts compiled by Bloomberg.

The four options on Intel with the highest ownership were all calls. The stock is up 35 percent this year.

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