If you want to co-invest with other people, you need an entity that can combine your capitals. Depending on what this entity invests into, and who is allowed to join it, various types of investment partnerships are possible.
Hedge Fund:
An investment partnership restricted to "sophisticated investors" - people who have enough experience to protect themselves. Hedge Funds are not allowed to accept capital from general public (investors need to be accredited); in exchange, they don't have restrictions on what they can invest into. The professional fund manager is then compensated with a share of the money for his/her time and efforts.
Mutual Fund:
They invest in publicly traded securities (stocks & bonds), and anyone is allowed to join. To protect general public investors, Mutual Funds are heavily regulated and restricted in what they can invest into. Mutual fund managers receive a fixed fee.
Private Equity Firms:
Private equity firms characteristically make longer-hold investments in target industry sectors or specific investment areas where they have expertise. Private equity firms and investment funds should not be confused with hedge fund firms which typically make shorter-term investments in securities and other more liquid assets within an industry sector but with less direct influence or control over the operations of a specific company. Where private equity firms take on operational roles to manage risks and achieve growth through long term investments, hedge funds more frequently act as short term traders of securities betting on both the up and down sides of a business or industry sector's financial health.
Private
equiteers attempt to buy companies at low EBIT multiples with high
leverage and make their money increasing operational efficiency and
maintaining highly disciplined capital management. Their preferred
holding period is dependent on returns but generally not more than 5
years and usually less.
One example in Turkey is Turkven.
also there are some others...
Bonus: 2 and 20 Fee Structure
The 2 and 20 fee structure is the way that most private equity firms (incl. hedge funds) are
compensated. More specifically, this phrase refers to how hedge fund managers charge a
flat 2% of total asset value as a management fee and an additional 20%
of any profits earned.
Considering that some of the top performing hedge funds earn upwards of
50% returns per year and that a given manager can manage billions of
dollars worth of assets, this type of fee structure can be very
lucrative for managers who consistently earn high returns.