By Chibuike Oguh

NEW YORK (Reuters) -The steep rally in Wall Street stocks is sparking worries among investors of a bubble forming, which could lead to a significant correction.

Optimism over the prospects of artificial intelligence has lifted the valuations of several technology heavyweights including Nvidia, Microsoft and most recently, Oracle.

This has propelled benchmark S&P 500, Nasdaq and the Dow to new heights this year. S&P 500 and the Nasdaq hit fresh record highs on Thursday and are up about 15% and 19%, respectively. The Dow has gained about 10% year-to-date.

The rise in U.S. equities has attracted a series of warnings about the likelihood of an impending correction.

International Monetary Fund chief Kristalina Georgieva warned on Wednesday about the risks to the world econ

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