Why Custom Contracts Are Critical For Series A Side Letters

By Author: AirCounsel
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Why Custom Contracts by an Attorney Are Critical for Investor-Ready Series A Side Letters Closing a Series A round is a monumental milestone for any high-growth startup. While primary term sheets and stock purchase agreements establish the broad strokes of the deal, sophisticated venture investors often demand specific, customized promises. These carve-outs are typically formalized using side letters—agreements that modify or add rights for specific shareholders. Managing these requests requires precision. While templates exist, relying on generic forms can introduce structural risks, conflicting terms, and future compliance issues. Securing custom contracts by an attorney ensures that your side letters align with Delaware corporate law, safeguard founder control, and keep your company legally compliant. According to data published by the Small Business Administration (SBA), 99.9% of all US enterprises are small businesses , highlighting that structured, high-stakes corporate scaling is underpinned by the same fundamental need for secure and professional business documentation. Handling venture financing demands an understanding ...
... of specialized corporate mechanics, governance rules, and fiduciary duties. Let us break down how founders can successfully navigate customized side letters during their Series A transition. Table of Contents Quick Summary What Is a Series A Side Letter? Commonly Negotiated Terms in Side Letters Information and Observer Rights Pro Rata Participation and MFN Status Consistency Risks: Keeping Your Deal Documents Aligned Step-by-Step Checklist for Drafting Investor-Ready Side Letters Why Generic Templates Fail Series A Founders Streamline Your Series A Side Letters with AirCounsel Frequently Asked Questions Recommended Quick Summary Takeaway Explanation Side Letter Purpose Used in Series A rounds to grant specific, customized rights to individual investors without rewriting the core financing documents. Key Risk Inconsistencies between side letters and main documents (like the Investor Rights Agreement) can lead to breach of contract or governance disputes. Common Terms Typically covers observer rights, information rights, pro rata rights, and Most-Favored-Nation (MFN) clauses. The Solution Relying on custom contracts by an attorney ensures terms are legally enforceable and compliant with Delaware or local state law. What Is a Series A Side Letter? A side letter is a bilateral agreement executed alongside primary transaction documents during a financing round. In a standard Series A round, the primary documents include the Stock Purchase Agreement (SPA), the Investors’ Rights Agreement (IRA), the Voting Agreement, and the Right of First Refusal and Co-Sale Agreement (ROFR). While these primary files are signed by all participating investors, side letters are executed only between the company and a single investor. Founders use them to address specialized investor demands without cluttering the main contracts or forcing all c