Anti-Dilution is a preferred stock term typically given to venture capital investors that protects the VC investor from a large reduction in ownership of a startup due to the startup’s issuance of additional shares at a price per share lower than what the VC investor previously paid.

The benefit of anti-dilution protection for the VC investor is that the VC investor will receive a conversion adjustment based on the lower-priced issuance of stock in the future.

The amount of the conversion adjustment will depend on what type of anti-dilution protection is used:

-Weighted Average
-Broad-based Weighted Average
-Narrow-Based Weighted Average
-Full Ratchet