How would a stock move from one stock exchange to another exchange?

Question

Example:

How would a company move from NASDAQ to NYSE or AMEX?

Answer 1

Every company have to register on exchange.
One will have to cancel registration if not required on perticular exchange. it is known as delisting.

Answer 2

The exchanges each have their basic entrance and sustaining requirements. The links below give the details for each.

As for reasons to move, check out the sales pitch they give on the American Stock Exchange. Click on Equities on the left column, then click on Amex Advantage. (I intended to give a link or copy and paste, but it wouldn't let me, sorry)

Answer 3

Elves carry boxes of the certificates across the street in the dead of night, and the next thing you know, it has a new symbol!