Exchange-traded funds attracted $17 billion in the first six months of the year, accumulating $12 million in the second quarter alone, according to Strategic Insight of New York. Assets in exchange-traded funds reached $52.6 billion at the end of June, up from $35.8 billion at the end of 1999, the firm said.

The NASDAQ-100, or QQQ exchange-traded funds attracted $7 billion in the first half of the year, while the iShares of Barclay's Global Investors of San Francisco attracted $2 billion, even though the funds were not available to investors until late in the second quarter, according to Strategic Insight.

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