1. equity investment: company investors can invest in the company by issuing additional shares, issuing new shares or subscribing for part of the company's equity.
2. Debt investment: corporate investors can invest in the company by issuing corporate bonds or borrowing money.
3. Investment in intangible assets: Company investors can invest in the company by investing in intangible assets, such as trademarks and patents.
4. Direct investment: Company investors can invest in the company by directly investing in the company's assets, such as factory buildings and machinery.