Anti-Dilution Protection: Safeguarding Your Investment Value

How full ratchet and weighted-average clauses respond when a company raises money at a lower valuation

Explains how a down round dilutes early investors in percentage, value and influence, and how anti-dilution provisions in a Shareholder Agreement adjust their shares. Compares full ratchet with broad-based and narrow-based weighted-average protection, then covers negotiating the level, formula, carve-outs and scenario modelling.

By Nour Attorneys / 22 August 2026

Reviewed by Mohamed Noureldin, Founder, Managing Partner & Senior Legal Consultant

You invested in a company at one price per share. The company has not performed as expected and now has to raise money at a lower valuation than when you came in. It issues new shares at a cheaper price. That can severely dilute your ownership stake and significantly decrease the value of your original investment. Anti-dilution provisions in a Shareholder Agreement can protect your ownership percentage and the value of your investment when that happens.

An up round dilutes you too, but you still gain

When you invest, you buy a certain number of shares at a specific price, and that gives you a percentage of ownership. As the company grows, it will likely need more capital, and it raises it by issuing new shares to new investors.

If the company is doing well, the new round happens at a higher valuation. Your ownership percentage may decrease, but the value of your investment will increase. The difficulty comes when the new round is priced below yours. This is known as a "down round".

What a down round costs an early investor

For early investors it is a double blow, and the harm comes in several forms:

Percentage decrease. Your ownership percentage falls further than it would in a flat or up round, because more shares are issued for the same amount of new capital.
Value decrease. The price per share in the new round effectively re-prices your own shares downward. The investment you made at a higher valuation is now worth less on paper, a direct hit to your portfolio.
Loss of influence. A smaller stake can also mean less voting power and influence over the company's direction, including the potential loss of a board seat or veto rights.
Erosion of confidence. A down round can signal problems within the company, erode investor confidence and make future funding harder to attract.

Adjusting the early investor's shares

Shareholder Agreements (or Investment Agreements) often include anti-dilution provisions to protect early-stage investors from the harsh effects of a down round. These mechanisms adjust the number of shares held by early investors. The aim is to partially or fully offset the dilutive effect of a later down round.

The protection is against a lower valuation. It does not protect against the dilution that naturally occurs when a company issues more shares. There are two main types: full ratchet and weighted-average.

Full ratchet: treated as if you paid the lower price

This is the most investor-friendly and aggressive form of anti-dilution protection. The conversion price of the early investors' shares is adjusted downward to the price of the new shares issued in the down round. In effect, their entire investment is re-priced at the new, lower price, as if they had invested at that price from the beginning.

Example: an early investor bought 1,000 shares at AED 10 per share. The company later issues new shares at AED 5 per share. A full ratchet provision treats the early investor as if they had bought their shares at AED 5. They would be issued an additional 1,000 shares, bringing their total to 2,000 shares.

That is extremely protective for the early investor. It can also be severely dilutive to founders and other common shareholders.

Weighted-average: a blended price between the two rounds

This is a more common and balanced approach. The formula takes into account the lower price of the new shares and also the number of new shares being issued. It produces a new, blended conversion price somewhere between the original price and the down-round price. There are two types:

Broad-based weighted-average. The calculation includes all outstanding shares of the company, including options, warrants and other convertible securities. It is more common and more founder-friendly, because the adjustment is less drastic.
Narrow-based weighted-average. The calculation uses a smaller number of outstanding shares, typically excluding options and warrants. The adjustment favours the investor more than the broad-based formula does, but it is still less severe than a full ratchet.

Level, formula, carve-outs and modelling

Anti-dilution rights are a key point of negotiation in any venture capital or angel investment deal:

The level of protection. As an investor, you will likely advocate for stronger protection, like a full ratchet. Founders will push for a more moderate approach, like broad-based weighted-average. The final agreement often depends on market conditions.
The formula. The Shareholder or Investment Agreement must precisely define the chosen anti-dilution formula, to avoid any ambiguity in its calculation.
Carve-outs. It is common to include "carve-outs", or exceptions, where anti-dilution protection will not apply. These typically include shares issued under employee stock option plans (ESOPs), shares issued in connection with strategic acquisitions, or shares issued to lenders or landlords.
Scenario modelling. Before finalising the agreement, both investors and founders should model different down-round scenarios, to fully understand the potential impact of the chosen provision.

What early investors gain from the provision

By negotiating and including anti-dilution provisions, early investors achieve several outcomes:

Downside protection: a safety net that protects the value of their investment in the event of a future down round.
Preservation of ownership: mitigation of the severe dilution of their ownership percentage.
Fair treatment: an assurance that their early risk is recognised and that they are not unfairly penalised if the company stumbles before it grows.
Increased confidence: the confidence to make early-stage investments, knowing a mechanism is in place to protect their stake.

Disclaimer: the information in this article is for general informational purposes only and does not constitute legal advice. Readers should seek professional legal advice tailored to their specific circumstances before making any decisions or taking any action based on it.