Jack Dorsey gives up 10% of his Square shares for the option pool (opens in new tab)

Interesting contrast between Square (Dorsey giving back shares to the option pool) and Zynga in 2011:

http://news.cnet.com/8301-13506_3-57322150-17/zynga-to-emplo...

Asking for 'underperforming' employees to give their shares back to the option pool.