The current owners will determine how much to sell / keep in consultation with their investment bankers. If they keep a controlling stake, however, that may affect how much money they can raise.
The biggest “pro” is the ability to raise a lot of money (in the form of equity as opposed to debt) at once, and generally this is an exit strategy for current ownership – for example, a private equity firm buys an under-performing company on the cheap, rights the ship, and then recoups their investment/realizes their gains by selling the company via an IPO.
As others have noted, the biggest “con” is the reporting / other obligations under the securities laws that result from now being a public company.
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