Cramer's 'Mad Money' Follow-Up: Sept. 17

Every night on "Mad Money," Jim Cramer offers market commentary and general investment advice, and he makes calls on specific stocks, both of his own choosing and in response to viewer requests. He relies on his many years of experience and strong track record, and he takes full responsibility for his calls.

"I never shirk from admitting my mistakes; instead, I dwell on them to learn from them. I change my mind, I take losses, I own up to them," Cramer has said.

Here we track some of his calls from the previous episode of "Mad Money" and find out, at least in the very short term, how the stocks are performing. Keep in mind that Cramer might not have been recommending that viewers take immediate action on a stock. And, of course, it's up to the individual investor to do his or her own homework.

That said, here's how some of the stocks that Cramer talked about on Wednesday's "Mad Money" show fared today.

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Knight Capital(NITE Quote): Cramer said that Knight is the way to play the day-trading explosion. Trading volumes are rising, he said, and Knight is eating up market share, handling 5 million trades a day.

On Thursday, Knight closed up 4 cents, or 0.2%, at $21.88.

Microsoft(MSFT Quote): During his "Lightning Round" segment, Cramer said he couldn't recommend Microsoft over Google(GOOG Quote) or Apple(AAPL Quote). "Microsoft is not a great stock here," he said.

On Thursday, Microsoft added 10 cents, or 0.4%, to $25.30. Google gained $3.43, or 0.7%, to $491.72, and Apple closed up $2.68, or 1.5%, at $184.55.

3Com(COMS Quote): Cramer also preferred Apple to 3Com, saying he'd sell the latter and buy the former.