An investor rights agreement is one of the core legal documents in a priced financing round, spelling out ongoing rights investors get beyond just their equity: information rights, registration rights, and often pro rata and tag-along rights.
Information rights typically require the company to share financial statements and other updates on a regular schedule, part of why a company needs clean, current books well before a priced round closes, not just at the moment it's raising.
This is also usually where side letters and pro rata rights get formally granted, alongside the main terms every investor in the round receives. Worth reading through carefully at signing, not just trusting that it matches the term sheet, since the definitive documents are what actually govern once the round closes.
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