What is an MFN clause?
In M&A and venture capital contexts, a Most-Favored Nation (MFN) clause guarantees a contracting party that if the counterparty grants more favourable terms to another counterparty (now or in future), those better terms automatically extend to the MFN beneficiary. The MFN concept is borrowed from international trade law but has become a workhorse in financing instruments — notably SAFEs (Simple Agreements for Future Equity), convertible notes, and side letters.
MFN in SAFEs and convertibles
- MFN SAFE: if the company later issues another SAFE with more favourable terms (lower valuation cap, higher discount, better pro-rata), MFN holder can elect to adopt those terms.
- Convertible note MFN: protects early-note investors against later notes with better conversion mechanics.
- Election windows: MFN typically must be exercised within a defined window after notice of subsequent issuance.
MFN in fund side letters
Limited Partners (LPs) frequently negotiate MFN clauses in side letters granting them the right to elect any more favourable terms granted to other LPs. Fund managers typically negotiate carve-outs: (i) terms specific to a particular LP type (e.g., sovereign wealth, public pension, ERISA), (ii) terms granted to anchor LPs, (iii) terms required by legal/regulatory considerations.
MFN in commercial contracts
- Pricing MFN: seller guarantees buyer won’t get worse pricing than other buyers — common in enterprise SaaS, distribution agreements.
- Antitrust risk: certain MFN structures (especially in marketplace contexts) attract antitrust scrutiny — e.g., Amazon EU “fair pricing,” Booking.com narrow MFN cases.
Administering MFN promises
An MFN clause is only as good as its administration. Grantor-side: keep a register of every MFN outstanding (a low-cap note issued in a hard week can silently reprice an entire instrument stack), define comparability tightly (same instrument type, same period), and time-box election windows. Beneficiary-side: notification covenants are the enforcement spine — without a duty to inform, the right depends on luck. In LP side letters the standing architecture is tiered election sheets circulated after each close; in commercial contracts (supply, licensing), MFN pricing clauses additionally meet competition-law review, since price-parity obligations by dominant players have drawn enforcement across jurisdictions, including platform parity cases in Türkiye.