Meaning
Investor protection mechanisms adjust the conversion price of preferred shares when subsequent funding occurs at a lower valuation. This anti dilution ratchet ensures that earlier backers maintain their relative ownership by lowering the price at which their preferred stock converts to common equity. It applies during a down round and stops protecting the holder once the conversion price reaches the new share price.
Conversion Mechanic
Adjustments occur whenever a company issues new shares at a price below that paid by the existing protected investors. The anti dilution ratchet resets the conversion price to the exact price of the new issuance regardless of the number of shares sold. This differs from weighted average methods because it ignores the size of the new round and focuses only on the price.
Equity Compression
Heavy pressure falls on common shareholders when these clauses trigger. Because the anti dilution ratchet increases the number of shares the investor receives upon conversion, the common pool shrinks in relative terms. Founders find their control diminished as the cap table shifts toward the protected parties.
This movement often occurs when the business needs cash urgently but cannot sustain its previous valuation.
Incentive Friction
Conflict often arises between new capital providers and existing holders of these rights. A new investor might demand that holders waive the anti dilution ratchet as a condition for providing fresh funds. This negotiation determines whether the company survives or collapses under the weight of its own capital structure.
Founders occupy a difficult seat here as they must mediate between two groups of senior capital providers. The resulting cap table often leaves the operator with meaningfully less upside than originally anticipated.