Why Anti-Dilution Exists
Anti-dilution provisions protect preferred shareholders (investors) when a company issues new shares at a lower price than the investor's round (a down round). Without anti-dilution protection, an investor who paid $5/share would be diluted just like everyone else if the next round prices at $3/share. Anti-dilution provisions adjust the investor's conversion price downward, effectively giving them more shares to compensate for the reduced price.
Anti-dilution is a standard term in venture financing, but the specifics vary significantly and can have a dramatic impact on founder economics.
Full Ratchet Anti-Dilution
Full ratchet is the most aggressive form of anti-dilution protection. It adjusts the investor's conversion price to exactly match the new lower price, regardless of how many shares are issued in the down round.
Example: An investor puts in $5M at $5/share (1M shares). A subsequent round prices at $2/share. Under full ratchet, the investor's conversion price drops to $2/share, giving them 2.5M shares instead of 1M, a 150% increase in shares. This massive adjustment comes entirely at the expense of common shareholders (founders and employees).
Full ratchet is considered highly unfavorable for founders and is relatively rare in standard venture deals. It is more common in bridge rounds, down rounds, and situations where investors have significant negotiating leverage.
Weighted Average Anti-Dilution
Weighted average is the standard form and is far more founder-friendly. It adjusts the conversion price based on the relative size of the down round compared to the total shares outstanding. A small down round triggers a small adjustment; a large down round triggers a larger one.
The formula considers both the number of new shares issued and the price difference. There are two variants:
- Broad-based weighted average: Includes all outstanding shares (common, preferred, options, warrants) in the calculation. This produces a smaller adjustment because the denominator is larger.
- Narrow-based weighted average: Only includes preferred shares in the calculation, producing a larger adjustment that is less favorable for common shareholders.
Considering a sale?
A sell-side advisor at FIH.com can talk it through on a success basis, with no retainer.
Practical Impact
Using the same example ($5M at $5/share, followed by a $2/share round):
- Full ratchet: Conversion price drops to $2.00
- Broad-based weighted average: Conversion price might drop to $3.50-$4.00 (depending on round sizes)
- No anti-dilution: Conversion price stays at $5.00
The difference between full ratchet and broad-based weighted average can represent millions of dollars in value transfer from founders to investors.
Negotiation Best Practices
Founders should always push for broad-based weighted average anti-dilution as the standard. If an investor insists on full ratchet or narrow-based, negotiate for a pay-to-play provision that requires investors to participate in the down round to benefit from anti-dilution protection. This prevents investors from getting anti-dilution adjustment without contributing new capital when the company needs it most.
Also consider negotiating a cap on anti-dilution adjustment or an exclusion for small issuances (option grants, strategic partnerships) that should not trigger anti-dilution protection.