An investment agreement governs the terms when an investor adds capital to a limited company, usually through a new share issue. It sets out valuation, ownership stake and rights.
The agreement often goes hand in hand with a shareholders' agreement and affects the company's cap table. For startups it is important that ownership after the investment is reflected correctly in the share ledger.

A shareholders' agreement is an agreement between shareholders governing how they should act in the company.
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A share purchase agreement (SPA) is the agreement that sets out the terms when shares in a company are sold.
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A new share issue is when a limited company issues new shares for payment to increase its capital.
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A cap table is an overview of how ownership in a company is distributed among its shareholders.
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