Zynga (ZNGA) this morning revealed who would be selling shares as part of a secondary stock offering, via an amended regulatory filing. The offering originally was designed to raise $400 million, but now has expanded to upwards of $687 million.

Here’s the breakdown:

• CEO Mark Pincus: 16.5 million shares, leaving him with around 94 million shares
• Institutional Venture Partners: 5.8 million shares, leaving it with around 28.5 million shares
• Union Square Ventures: 5.2 million shares, leaving it with around 25.5 million shares
• Reid Hoffman: 687,000 shares, leaving him with nearly 3.9 million shares.
• Own Van Natta: 505,000 shares, leaving him with around 2.18 million shares.

Zynga stock closed trading yesterday at $13.76 per share, compared to a $10 per share IPO price last December. Those not selling any shares in this secondary offering include Kleiner Perkins Caufield & Byers (which also didn’t sell any of its 44 million shares at IPO), Foundry Group or Avalon Ventures.

In other Zynga news, the company disclosed that it paid $180 million for Draw Something maker OMGPOP. No mention of the reported $30 million in employee retention bonuses also included in the deal.