The Anti-Dilution Clause: What It Means and How to Negotiate It (2026)

What an anti-dilution clause does An anti-dilution clause protects an investor if the company later raises money at a lower price per share than the investor paid. This situation is called a down round. The clause adjusts the investor's position so that some of the loss from the lower valuation is shifted back onto the earlier shareholders, usually the founders and holders of ordinary shares. The mechanism normally works through the conversion price of preference shares. An investor in a priced round typically holds convertible preference shares that convert into ordinary shares, at the start one for one. If a down round triggers the anti-dilution clause, the conversion ratio improves, so each preference share converts into more ordinary shares. The investor ends up with a larger percentage of the company than before the adjustment, cushioning the hit from the lower valuation. There are two main methods, and the choice between them matters enormously: full ratchet, and weighted average. Anti-dilution protection is standard in venture capital and private equity term sheets, which is why founders meet it early and should understand it before signing. ## The two methods Full ratchet is the investor friendly extreme. It resets the investor's conversion price to the new, lower price, regardless of how many shares were issued in the down round. Even a small issue at a low price can sharply increase the investor's shareholding. Full ratchet is harsh on founders and is less common in balanced deals. Weighted average is the market standard and the fairer approach. It adjusts the conversion price based on both the lower price and the number of new shares issued relative to the existing share base. A small down round causes a small adjustment, a large one causes a bigger adjustment. Weighted average comes in two variants, broad based and narrow based, depending on how many of the company's shares and options are counted in the formula. Broad based is more founder friendly because it spreads the effect across a larger share count, producing a smaller adjustment. ## Why the clause matters For investors, anti-dilution is downside protection. If they paid a high price and the company later struggles and raises lower, the clause stops their stake being diluted as severely as it otherwise would. It aligns risk with the price they paid. For founders, the clause can be costly in exactly the moment they can least afford it. A down round already signals difficulty, and anti-dilution makes it worse by further diluting the founders and employees. That is why the method chosen, and the carve outs, are among the most important economic terms a founder negotiates. ## Sample wording Anti-dilution is usually expressed as a formula in the articles or shareholders' agreement. A simplified weighted average description reads: ```

Anti-Dilution (broad based weighted average) If the Company issues new equity securities at a price per share less than the applicable Conversion Price of the Preference Shares (a Down Round), the Conversion Price shall be adjusted in accordance with the broad based weighted average formula set out in Schedule [x], which takes into account the price of the new issue and the number of new shares issued relative to the fully diluted share capital. The adjustment shall not apply to Excluded Issuances.

- Narrow based weighted average when broad based is standard and fairer to founders.
- Thin or missing carve outs, so routine issues like the option pool or acquisition shares trigger an adjustment.
- No pay to play, letting investors keep full protection without supporting the company in the down round.
- Anti-dilution stacked with a heavy liquidation preference, which can leave founders with little in a modest exit.
- A formula in a schedule that no one has modelled, so the real effect is only discovered when a down round happens. ## How jurisdiction changes things Anti-dilution is a commercial and corporate law matter, and the mechanics depend on how shares and conversion rights work under local company law. In the United States, anti-dilution formulas are standardised through widely used venture financing documents and are implemented in the certificate of incorporation. In India, preference shares and their conversion are governed by the Companies Act 2013 and related rules, and pricing of securities can be affected by foreign exchange rules under FEMA where overseas investors are involved, so a down round adjustment must be structured to comply. In the United Kingdom and other jurisdictions, the adjustment sits in the articles and the investment agreement. Tax and securities law can affect how adjustments are implemented. Treat this as general information and take qualified legal and tax advice for any financing. Anti-dilution is a formula with large human consequences. Understand which method you are agreeing to before the down round makes it real. --- Comparing anti-dilution wording across term sheets, checking that the carve outs and the liquidation preference line up, and keeping every version of a shareholders' agreement straight are easier when drafting, review and version history share one place. [Adira](https://adiralaw.com) is built around that single workspace idea for business contracts, with per clause analysis and Indian corporate law, including Companies Act checks, deepest today. For understanding the clause itself, the explanation above is enough.