Facebook's IPO: who gets rich?

The rich are going to get richer when Silicon Valley's biggest IPO starts trading.

Facebook is only getting about half - or USD 5.6 billion - of the roughly USD 10.6 billion it plans to raise via a mega IPO. The other half, or about USD 4.9 billon, is going to a handful of inside investors - many Silicon Valley notables.

Chief among them are co-founder and Chief Executive Mark Zuckerberg, venture firm Accel Partners, early investor and PayPal co-founder Peter Thiel, Russian tycoon Yuri Milner's DST, and investment bank Goldman Sachs .

And Mark Pincus, co-founder of the gaming company Zynga , is set to get his second payout in six months. He stands to make almost USD 32 million, on top of his take when the social gaming giant he co-founded went public last year.

Those holding onto their stakes - for now - include: Napster co-founder and Facebook founding president Sean Parker; co-founder and Zuckerberg's Harvard roommate, Dustin Moskovitz; various Facebook executives; and venture capital firm Andreessen Horowitz.

The largest seller is Accel Partners, which will make about USD 1.2 billion if the shares sell at the USD 31.50 mid-point of an indicative price range. Zuckerberg, who started Facebook in 2004 from his Harvard dorm room, is selling the next largest chunk of shares worth a little under USD 1 billion.

Assuming the mid-point price of USD 31.50, following are details on the amount the selling stockholders will make:

Accel Partners USD 1.2 billion

Accel Partners USD 1.13 billion

Lead investor Jim Breyer USD 72.75 million

Mark Zuckerberg USD 951.3 million

Digital Sky Technologies USD 827 million

Goldman Sachs USD 415 million

MAIL.RU USD 355 million

Peter Thiel and associated funds USD 244 million

Meritech Capital USD 220 million

Greylock Partners USD 220 million

Microsoft Corp USD 207 million

Elevation Partners USD 145 million

Tiger Global USD Management 106 million

Mark Pincus USD 31.8 million

Mark Pincus Personal USD 22.66 million

Ogden, an entity controlled by Pincus USD 9.13 million

Reid Hoffman USD 29.7 million

Aufklarung, Hoffman's angel fund USD 24.7 million

Reid Hoffman USD 2.5 million

Michelle Yee, Hoffman's wife USD 2.5 million