Investors eager to buy into the stock market rally may want to hold off, according to an analyst for Canadian investment bank Canaccord Genuity. The S & P 500 and Nasdaq Composite closed at all-time highs on Monday, adding to strong gains in the first half of the year. The tech-heavy Nasdaq ended the first half up 18.1%, while the S & P rose 14.5% and the Dow Jones Industrial Average gained 3.8%. In fact, the top 10 stocks in the S & P now account for more than 38% of the index's total capitalization, a new high, Welch said. Meanwhile, the S & P 500 is trading at a rich multiple of 24 times trailing 12-month profits, and expectations are for 10.1% earnings growth in the second quarter, he said.

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Persons: Canaccord Genuity's Michael Welch, Welch, Russell Organizations: Nasdaq, Dow Jones Industrial