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It's like Alibaba cures cancer or something

Jack Ma, founder of Alibaba Group Holding Ltd.
Dan Groshong | Bloomberg | Getty Images
Jack Ma, founder of Alibaba Group Holding Ltd.

OK, Alibaba doesn't cure cancer, but you'd think so with some of the theories going around.

I noted during my 9:35 a.m. ET hit that the stock market open was unusually strong: All major indices opened up, all 10 S&P sectors opened up, and both the Dow Industrials and Dow Transports were at new highs (Dow Theorists rejoice).

The most logical reason we would have this mild lift is that traders are unwinding hedges that were put on ahead of the Federal Reserve meeting that ended yesterday.

In simple terms, there was a lot of put buying (protection) purchased in case the Fed made some kind of hawkish comments about raising rates.

That didn't happen, so those bets are being unwound. Volatility dropped. Today, lots of selling of puts, and buying calls.

There is also the quarterly expiration of options and futures (known as "quadruple witching"). There may be some effect on trading, but it is difficult to sort out.

But many traders believe at least part of this rally is due to the "Alibaba effect." What's that?

Read MoreWatch Art Cashin: Alibaba IPO lifting stocks

NASDAQ was a big underperformer on Monday, down over 1 percent. The theory is that many were selling certain tech stocks to buy the Alibaba IPO later in the week. There is a 3-day settlement period to get the money, so traders would get their dough on Thursday in time to buy Alibaba.

But many who put in orders for Alibaba apparently are not getting anywhere near what they wanted, so rather than buy at a likely very high price after the open many are buying back into the market. NASDAQ outperforming today.

This is a neat theory, but it is likely only a small part of the rally. Volumes are not particularly strong in any of the ETFs you would normally see big traders moving in and out of, even for an expiration day.

I don't know about an "Alibaba effect" on the market, but I surely do believe in a "Fed effect."

Just look.

  • Bob Pisani

    A CNBC reporter since 1990, Bob Pisani covers Wall Street from the floor of the New York Stock Exchange.

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