I see the ownership breakdown of MSFT on yahoo.finance.com, and the numbers below do not sum to 100%.
BREAKDOWN
% of Shares Held by All Insider and 5% Owners: 13% % of Shares Held by Institutional & Mutual Fund Owners: 61% % of Float Held by Institutional & Mutual Fund Owners: 70%
I can't understand why this doesn't sum to 100%. Moreover, how is it that Bill Gates is worth over $40B when he owns less than 13% of a $152B company, and 13% of $152 = $20B?