Private equity fund refers to a securities investment fund that raises funds from specific investors in a non-public way and invests in specific objects. Private equity funds are raised by means other than mass communication, and promoters set up investment funds to invest in securities by collecting funds from non-public multi-subjects. Investment risk is high, and private equity fund means high risk, flexible operation and unstable performance.

In China's financial market, "private fund" or "underground fund" is usually a collective investment that is privately raised by specific investors, as opposed to the securities investment fund that is supervised by the competent department of China government and publicly issues beneficiary certificates to unspecified investors.

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Equity investment usually needs to go through several years of investment cycle, and because it is invested in developing or growing enterprises, the development risk of the invested enterprises themselves is very high. If the invested enterprise ends in bankruptcy, the private equity fund may lose all its money.

Private equity investment not only injects capital into the target enterprise, but also injects advanced management experience and various value-added services, which is also a key factor to attract enterprises.

While meeting the financing needs of enterprises, private equity investment funds can help enterprises improve their management ability, expand procurement or sales channels, integrate the relationship between enterprises and local governments, and coordinate the relationship between enterprises and other enterprises in the industry. All-round value-added services are the highlight and competitiveness of private equity investment funds.