Who are the stock holder?

Is a large part of them pension funds?

Or just greedy people?

Pension funds are important shareholders of listed and private companies. They are especially important to the stock market where large institutional investors like the Ontario Teachers' Pension Plan dominate. The largest 300 pension funds collectively hold about $6 trillion in assets. In January 2008, The Economist reported that Morgan Stanley estimates that pension funds worldwide hold over US$20 trillion in assets, the largest for any category of investor ahead of mutual funds, insurance companies, currency reserves, sovereign wealth funds, hedge funds, or private equity.