Meaning
Contractual clauses in investment agreements protect an investor’s ownership percentage when a company issues new shares at a price lower than what that investor previously paid. Broadly, anti-dilution provisions alter the share conversion ratio for preferred stock during subsequent down rounds. The underlying mechanism forces existing common shareholders to absorb the equity contraction caused by issuing cheaper stock to new participants.
Standard legal instruments operate through broad-based weighted average formulas or full ratchet mechanics. Application halts once preferred shares convert into common stock or when explicitly waived by a qualified majority of affected share class holders.
Conversion Adjustment
Share conversion ratios shift mathematically to lower the cost basis of earlier capital infusions. When anti-dilution provisions trigger, preferred shares convert into a higher quantity of common shares upon exit or liquidity events. Full ratchet mechanisms reset the price to the lowest new issue level regardless of volume, whereas broad-based weighted average formulas account for both the price and total share volume of the new issuance.
Founders bear the resulting equity compression because option pools and common share pools expand less rapidly than preferred conversion rights.
Downround Consequence
Capital structure reallocations transfer equity weight from early common holders to protected preferred classes when equity valuations decline. Equity distribution shifts permanently toward institutional investors holding these protections during recapitalizations.
Economic Boundary
Threshold limits and explicit waiver clauses restrict when these contractual rights apply during corporate financing cycles. Waiver provisions allow majority holders of preferred stock to bypass anti-dilution provisions during rescue rounds or follow-on investments. The protection ceases once shares convert to common stock or pass specified growth milestones established in the certificate of incorporation.