What Is My MFN Clause Actually Worth?
You negotiated a most-favored-nation clause. You felt protected.
Then the company raised another round on better terms. Your MFN did not trigger, and you were not notified.
Most-favored-nation clauses in side letters and SAFEs give investors the right to adopt better terms offered to subsequent investors. The clause sounds strong. In practice, it often has limits that many investors overlook.
What an MFN Clause Actually Does
It Is a Right You Must Exercise
An MFN clause does not automatically update your terms when a better deal comes along. It gives you the right to elect to receive those terms. If you do not exercise that right within the notice window, it may lapse. You keep your original terms. Many investors who lose the benefit of their MFN clause do so not because the clause failed—but because they never exercised it.
The Scope Determines What “Better Terms” Means
Not all terms are covered by every MFN clause. Your clause should specify:
- which future instruments are covered (SAFEs only, notes, side letters, preferred shares?)
- whether the clause applies to terms offered to all investors or just substantially similar ones
- whether it covers non-economic terms like pro-rata rights and information rights
A narrow MFN clause may cover only valuation caps and discount rates, while a broader one can extend to governance and participation rights. The difference matters.
Broad vs. Narrow MFN: The Two Standard Forms
Most MFN clauses fall into one of two categories:
- narrow MFN: applies only to economic terms (cap, discount rate) in instruments of the same type
- broad MFN: applies to all terms in any future financing document, including governance and participation rights
A broader MFN clause is generally more protective. Many investors sign narrow-form clauses without realizing they may be leaving material rights on the table.
The Notice Obligation Is on the Company, Not You
Most MFN clauses require the company to notify you when a better deal is offered to a new investor. That notice is the trigger for your election window. Companies that fail to send notice (intentionally or otherwise) may leave investors discovering the opportunity only after the window has closed. Build the responsibility to follow up into your investment practice.
3 Mistakes Investors Make Here
Mistake #1: Assuming the MFN Clause Is Self-Executing
The most common MFN error: investors assume that if a better deal is offered, their terms update automatically. They do not. Investors must:
- receive notice from the company
- review the new terms within the election window
- affirmatively elect to adopt the new terms before the deadline
Passive reliance on an MFN clause is one of the most common ways investors lose its benefit.
Mistake #2: Signing a Narrow MFN Without Negotiating the Scope
Investors who do not negotiate the scope of their MFN clause often end up protected only on economic terms. If a subsequent investor receives better governance rights, board observer rights, or enhanced pro-rata rights, a narrow MFN clause gives you no claim to those terms. When negotiating, request:
- explicit coverage of non-economic terms (pro-rata rights, information rights, board observation)
- a definition of “substantially similar instruments” that is broad enough to cover future notes or SAFEs
- a notice window of at least 15 business days for election
Mistake #3: Not Building a Portfolio Monitoring System
MFN clause benefits require active monitoring. Investors who do not track their portfolio companies’ subsequent fundraising will:
- miss notice windows entirely
- fail to review new terms before the election deadline
- discover better terms only after the opportunity to elect them has passed
Build a simple system. Flag every fundraising communication from portfolio companies.
Before Your Next Investment Closes, Work Through This
Before signing a SAFE or side letter with an MFN clause, work through this:
☐ Does my MFN clause cover both economic and non-economic terms?
☐ Is the definition of covered instruments broad enough to include future SAFEs, notes, and side letters?
☐ What is the election window after I receive notice, and is it long enough?
☐ Is the company’s notice obligation explicit in the agreement?
☐ Do I have a system to monitor portfolio company fundraising activity?
☐ Has legal counsel reviewed the MFN language before I sign?
If you cannot answer yes to all of these, your MFN clause may not protect you the way you expect.
Bottom Line
An MFN clause is only as valuable as the scope you negotiate and the attention you bring to exercising it. Investors with narrow MFN clauses and limited follow-up often find out too late that their protection was more limited than expected. Negotiate the scope. Build the system. Exercise the right.
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Sources Used
- Andreessen Horowitz, The Most Favored Nation Clause: What It Means for Seed Investors, https://a16z.com/most-favored-nation-clause-seed-investors/
- Cooley, Side Letter Terms for Venture Investors: MFN and Pro-Rata Rights, https://www.cooleygo.com/side-letter-terms-venture-investors/
- Carta, MFN Clauses in SAFEs: What Investors Need to Know, https://carta.com/learn/private-funds/management/mfn-clause-safes/
- National Venture Capital Association, Model Legal Documents: Side Letter, https://nvca.org/model-legal-documents/