The side letter you signed and forgot
Side letters survive the SHA. They override pari-passu. And they are the single most common diligence surprise in a Series B.
It is Friday evening. The round is almost closed. One investor asks for “just one small thing”. Not a change to the shareholders’ agreement. Just a side letter.
One extra reporting right. A board observer seat. Quarterly updates in a slightly different format. The founder signs. The money arrives. Everyone moves on.
Two years later, a Series B investor asks: “Please provide all investor side letters, waivers, amendments and governance undertakings.” The room becomes very quiet.
That is when founders realise the most important investor rights are not always in the shareholders’ agreement. Some sit in side letters. Some in waivers. Some in email undertakings. Some were signed to close a round and then forgotten.
This is not a venture capital documentation article. It is a governance article: about investor management, cap table discipline, fundraising readiness and diligence risk.
The Most Important Document Nobody Remembers
Most growth companies preserve the obvious documents: the share subscription agreement, shareholders’ agreement, articles, cap table, board approvals and share certificates. Side letters often receive less discipline because they feel like closing mechanics.
That is the mistake.
A short side letter can still change the company’s practical rights landscape. It may give one investor more information, board observer access, consultation rights before a strategic transaction, or most favoured nation protection if better terms are granted later.
International venture practice already recognises that governance rights may sit across multiple instruments, including investors’ rights agreements, voting agreements, ROFR and co-sale agreements, and management rights letters. The founder lesson is simple: the governance framework is not always contained in one document.
What Exactly Is a Side Letter?
A side letter is usually a separate agreement between the company and a particular investor. It sits alongside the SHA, SSA and constitutional documents. Its purpose is narrow: to address a specific investor requirement that is not intended for all shareholders or is better handled outside the main financing documents.
Common examples include:
Additional information or inspection rights.
Enhanced reporting obligations.
Board observer rights.
Consent or consultation rights.
ESG, anti-bribery, sanctions, data protection or compliance undertakings.
Transfer restrictions or transfer facilitation rights.
Co-investment opportunities.
MFN protections.
Strategic rights for corporate investors.
Side letters are common and legitimate. Institutional investors, strategic investors, development finance institutions and regulated funds may have sound reasons for requesting them. The issue is not the side letter. The issue is poor governance after signing.
Why Side Letters Exist
Side letters solve real commercial problems.
A strategic investor may need reporting on collaboration milestones. A foreign investor may require compliance confirmations for its investment committee or home jurisdiction policies. An ESG-focused fund may require labour, environmental or anti-corruption undertakings. An anchor investor may seek enhanced information rights because it is investing disproportionate capital.
Private equity practice offers the same lesson. Governance, transparency and alignment are central investor concerns, and side letters are recognised tools for tailored reporting, policy accommodations and MFN processes. Company-level financings follow the same commercial logic: investors have different mandates, risk controls and reporting duties.
Founders agree because the request may be reasonable, the investor may be important, and the company wants to close. That is understandable. Failing to track the promise afterwards is not.
The Governance Problem Begins Here
Every side letter creates a potential exception to the governance framework.
Founders often assume the SHA governs everything. In reality, investor rights may be scattered across the SHA, SSA, articles, board minutes, amendments, waivers, investor letters and informal undertakings.
In India, this matters because the articles of association have statutory significance under the Companies Act, 2013. Certain governance and transfer mechanics may require consistency between private contracts and constitutional documents. Indian law also distinguishes between rights enforceable as contract and restrictions that must be reflected in the articles to bind the company or affect share transfers.
The point is not that every side letter right must be put into the articles. The point is that founders must know whether the right is contractual, whether it needs board or shareholder approval, and whether it conflicts with the company’s constitutional documents.
For listed companies, SEBI’s governance framework is more disclosure-driven and prescriptive. Most startups are unlisted, but the governance principle remains relevant: undisclosed governance arrangements age badly, particularly as companies move toward late-stage investment or IPO readiness.
When Equal Shareholders Are No Longer Equal
Side letters can create different practical classes of investors even where the legal share class is the same.
One investor receives monthly accounts. Another receives quarterly summaries. One has a board observer. Another does not. One must be consulted before an acquisition. Another only has SHA rights. One has an MFN clause. Another was told the same right was unavailable.
This is not automatically unlawful. Contractual differentiation is normal in negotiated financings. But investors expect the company to explain it cleanly. They understand negotiated rights. They are less forgiving of undocumented exceptions, inconsistent disclosures and forgotten obligations.
“Pari passu” is often used loosely in startup discussions. Strictly, it usually concerns equal ranking within a class of securities, especially economic or liquidation ranking. It does not mean every investor receives identical contractual rights. Still, hidden side rights can create commercial tension where investors believed they were investing on substantially equal governance terms.
The Series B Diligence Surprise
When a Series B, growth equity or private equity investor asks for “all side letters”, it is mapping the company’s real governance perimeter.
Diligence requests commonly cover:
All investor side letters.
All amendments, waivers and consents.
All information, inspection and observer rights.
All rights granted outside the SHA or articles.
All transfer, exit, tag-along, drag-along, co-sale and liquidity arrangements.
All MFN rights.
All outstanding investor undertakings and reporting obligations.
Side letters become red flags not because they exist, but because nobody tracked them. A clean answer is manageable: “We have three side letters. Here they are. This matrix shows the rights, status and compliance position.”
A bad answer is: “We think there may have been one, but the person who handled that round has left.”
That answer slows the round, expands diligence, triggers requests for confirmations or waivers, and may affect valuation discussions if the rights restrict governance flexibility or exit execution.
The Most Common Side Letter Mistakes
Forgotten Information Rights- The company promised monthly reporting. It complied for six months. Then the finance lead changed and the reporting stopped. During diligence, non-compliance surfaces. The issue is not the report. The issue is governance memory.
Unrecorded Consent Rights- A side letter requires consent before a material related-party arrangement or business pivot. Management later acts without remembering the trigger. Even if curable, the investor relations damage is immediate.
Board Observer Rights- Observer rights are often treated casually because observers do not vote. That is unsafe. Observers may receive sensitive board materials and attend strategic discussions. Their access should be recorded, scoped and subject to confidentiality and exclusion rights.
MFN Clauses- MFN clauses are deceptively simple. If one investor later receives better rights, another may claim the benefit. If MFN rights exist, the company must monitor them before granting new side rights.
Inconsistent Reporting- Different investors can receive different information. But without a policy on what is shared, when, and under what confidentiality protections, information asymmetry becomes a governance problem.
Hidden Liquidity Rights- Some side letters contain exit-related commitments: consultation before a sale, secondary transfer support, tag-along enhancements or co-investment rights. They may not block an exit, but they can complicate execution when a buyer wants certainty and speed.
When Side Letters Override Expectations
A side letter does not automatically override the SHA, articles or mandatory law. Its legal effect depends on drafting, parties, governing law, approvals and consistency with constitutional documents.
The sharper point is practical: side letters can override expectations.
If the SHA suggests a common information regime but one investor receives deeper reporting, expectations shift. If the board assumes only directors attend meetings but an observer right exists, board practice shifts. If future investors assume no bespoke rights exist but diligence uncovers several, negotiation dynamics shift.
Governance is not only about enforceability in court. It is also about whether the company knows what it promised, can comply with it, and can explain it without embarrassment.
Real-World Lessons from Venture and Private Equity Transactions
Market practice across venture and private equity produces three clear lessons.
First, sophisticated investors expect rights mapping. Venture documentation often separates economic, voting, information, registration, co-sale and management rights across multiple documents. That only works if the company maintains a central map.
Second, private equity investors are sensitive to side letter administration. MFN processes, preferential terms and disclosure of side letter rights are governance issues, not housekeeping. Bespoke rights are acceptable; unmanaged rights are not.
Third, Indian corporate practice requires consistency where investor rights intersect with the articles, board powers and statutory governance. Transfer restrictions, veto rights, affirmative vote matters and exit arrangements should be checked across the SHA, articles and side letters before the next round, not during it.
What Boards Should Be Asking
Boards should not wait for the next financing to discover the company’s side letter history. They should ask:
Do we maintain a side letter register?
Have all side letters been reviewed recently?
Are all reporting, consent and consultation obligations being complied with?
Have any rights expired, become obsolete or been waived?
Are any MFN clauses outstanding?
Have all investor rights been mapped centrally?
Do any side letters conflict with the SHA, SSA or articles?
Could any side letter affect fundraising, secondaries or exit execution?
Good governance means knowing every promise the company has made. Not every promise is a problem. An unknown promise is.
The Side Letter Audit Every Growth Company Should Conduct
Step 1: Collect Every Document- Collect side letters, amendments, waivers, consents, comfort letters, email undertakings, observer letters, management rights letters and compliance undertakings. Do not stop at the SHA and SSA.
Step 2: Map Every Investor Right- Create a rights matrix listing investor, document, date, right, obligation owner, expiry, trigger, reporting frequency and compliance status.
Step 3: Identify Conflicts- Compare side letter rights against the SHA, articles, board practice and reporting policy. Look for inconsistent information rights, duplicate consent rights, unclear observer access and transfer restrictions that do not match the constitutional documents.
Step 4: Assess Compliance- Confirm whether each obligation is being performed. If not, decide whether cure, waiver, amendment or investor communication is required.
Step 5: Prepare for Diligence- Build a disclosure package with executed copies, a summary matrix, compliance notes and waivers. The objective is not to hide side letters. It is to show control.
The Boardroom Takeaway
A side letter is not merely a legal document. It is a governance decision, investor relations decision, disclosure decision, fundraising decision and future diligence decision.
Founders should not refuse side letters reflexively. They can be legitimate, efficient and necessary. But every exception should be intentional, documented, monitored and explainable.
The question every founder should ask is simple: if we had to disclose every side letter we have ever signed tomorrow morning, would we be comfortable doing it?
Every investor exception eventually becomes a diligence question. The best companies are not the ones that never sign side letters. They are the ones that know exactly what they signed, why they signed it, who must comply with it, and how it will look when the next investor asks to see everything.