How It Works
When an investor has leverage or presents special circumstances, the company may offer a side letter to secure their participation in a funding round. Common provisions include enhanced liquidation preferences, board observation rights, pro-rata investment rights in future rounds, carve-outs from anti-dilution clauses, or enhanced information rights. These terms exist in parallel with the standard investment agreement signed by all investors and remain enforceable independently.
Side letters are typically confidential, meaning other investors may not know about the preferential terms granted to competitors. This creates information asymmetry in the cap table and can cause friction if discovered later.
Why It Matters for Investors
For angel investors, side letters represent negotiating leverage. If you're deploying substantial capital, have industry expertise, or are filling a meaningful portion of a round, you have grounds to request customized protections. However, side letters cut both ways—more favorable terms for you may indicate the company needed your capital urgently, or they may create tension with other investors.
Understanding side letter dynamics is critical because they directly impact your returns and risk profile. An enhanced liquidation preference might guarantee you recover your investment before common shareholders, while pro-rata rights protect against dilution in future rounds. Conversely, accepting weaker terms than other investors can compromise your exit economics.
Example
Suppose you invest $500,000 in a Series A alongside other investors committing $200,000-$300,000 each. Your larger check gives you negotiating power. You might request a side letter granting you: (1) a 1x non-participating preferred liquidation preference instead of the standard 1x participating preference, (2) board observation rights, and (3) pro-rata investment rights in Series B. Smaller investors receive only the standard terms in the primary agreement, creating differentiated economics across the cap table.
Key Takeaways
- Side letters grant individual investors custom terms outside the primary investment agreement, typically based on investment size or strategic value
- Common provisions include enhanced liquidation preferences, information rights, and pro-rata participation in future rounds
- Confidentiality of side letter terms can create cap table tension and may signal negotiating leverage or company desperation
- Request side letters when you have meaningful leverage, but understand that preferential terms may affect company relationships or future fundraising dynamics