If you're searching for anti-dilution protection founder vs investor, you're trying to solve a real problem, not collect definitions. This guide walks through it step by step, the way we'd explain it to a founder sitting across the table.

Quick Answer

Anti-dilution protection founder vs investor comes down to your specific numbers, not a generic rule of thumb — the fastest way to get a real answer is to model it against your actual cap table instead of a spreadsheet estimate.

• Start from your real numbers, not an industry average
• Revisit this every time you issue new equity or close a round
• Use a live cap table so the math updates automatically

Anti-Dilution 101

Anti-Dilution 101. Here's what that covers: anti-dilution = investor protection if future rounds are at lower price, mechanism: investor gets more shares to make up for lower valuation, and how it plays out in practice. This is where dilution actually shows up on your cap table.

Anti-dilution = investor protection if future rounds are at lower price

Anti-dilution = investor protection if future rounds are at lower price. This is the step most founders underestimate — worth getting right before it turns into a bigger cleanup job later.

Mechanism: Investor gets more shares to make up for lower valuation

Mechanism: Investor gets more shares to make up for lower valuation. It sounds minor until it isn't, usually right when an investor or new hire is looking at the numbers.

Result: Founders and employees get diluted MORE

Result: Founders and employees get diluted MORE. Get this wrong early and it compounds quietly until your next round forces the issue.

This is built into every Series A/B/C

This is built into every Series A/B/C. — specifically, standard term.

Three Types of Anti-Dilution

Three Types of Anti-Dilution. Here's what that covers: full ratchet: investors multiply shares based on new low price, narrow-based: only counts preferred stock, and how it plays out in practice.

Full Ratchet: Investors multiply shares based on new low price

Full Ratchet: Investors multiply shares based on new low price. (brutal).

Narrow-Based: Only counts preferred stock

Narrow-Based: Only counts preferred stock. — specifically, harsh.

Broad-Based: Counts all stock including common

Broad-Based: Counts all stock including common. — specifically, more fair.

Weighted-Average: Blend of new and old pricing

Weighted-Average: Blend of new and old pricing. — often standard in 2026.

Real Example: Full Ratchet vs Broad-Based

Real Example: Full Ratchet vs Broad-Based. Here's what that covers: series a: $10m valuation, investor buys 1m shares at $10/share, series b: $5m valuation (down 50%), investor has full ratchet, and how it plays out in practice.

Series A: $10M valuation, investor buys 1M shares at $10/share

Series A: $10M valuation, investor buys 1M shares at $10/share. — often $10M. Anti-dilution is one of the most expensive clauses founders sign without understanding.

Series B: $5M valuation (down 50%), investor has full ratchet

Series B: $5M valuation (down 50%), investor has full ratchet. This is the step most founders underestimate — worth getting right before it turns into a bigger cleanup job later. Lovie makes it visual: 'See exactly how much you lose if down round happens with different anti-dilution terms.' Empowers founder negotiation.

Full ratchet outcome: Investor now has 2M shares

Full ratchet outcome: Investor now has 2M shares. — specifically, doubled.

Broad-based outcome: Investor gets 1.5M shares

Broad-based outcome: Investor gets 1.5M shares. — specifically, less harsh.

Founder dilution: Huge difference in ownership %

Founder dilution: Huge difference in ownership %. This is exactly the kind of detail that's easy to skip and expensive to fix retroactively.

Why Full Ratchet Is Rare in 2026

Why Full Ratchet Is Rare in 2026. Here's what that covers: founder revolt: vcs rarely use full ratchet anymore, broad-based standard: "weighted-average" is market standard now, and how it plays out in practice.

Founder revolt: VCs rarely use full ratchet anymore

Founder revolt: VCs rarely use full ratchet anymore. It sounds minor until it isn't, usually right when an investor or new hire is looking at the numbers.

Broad-based standard: "Weighted-average" is market standard now

Broad-based standard: "Weighted-average" is market standard now. Get this wrong early and it compounds quietly until your next round forces the issue.

Why? VCs know it destroys founder motivation

Why? VCs know it destroys founder motivation. This is exactly the kind of detail that's easy to skip and expensive to fix retroactively.

But: Still appears in deals with weak negotiating power

But: Still appears in deals with weak negotiating power. Most spreadsheet-based cap tables miss this until someone asks a question they can't answer on the spot.

Negotiating Anti-Dilution Terms

Negotiating Anti-Dilution Terms. Here's what that covers: push for: broad-based weighted average, avoid: full ratchet, and how it plays out in practice.

Push for: Broad-based weighted average

Push for: Broad-based weighted average. — specifically, not narrow.

Avoid: Full ratchet

Avoid: Full ratchet. — specifically, death spiral for founders.

Carve-outs: Anti-dilution doesn't apply to employee option grants

Carve-outs: Anti-dilution doesn't apply to employee option grants. This is the step most founders underestimate — worth getting right before it turns into a bigger cleanup job later.

Sunset: Anti-dilution expires after Series C

Sunset: Anti-dilution expires after Series C. — specifically, rare but possible.

Impact Modeling

Impact Modeling. Here's what that covers: down round scenario: company raises at lower valuation, with full ratchet: founder loses 35% ownership, and how it plays out in practice.

Down round scenario: Company raises at lower valuation

Down round scenario: Company raises at lower valuation. This is the step most founders underestimate — worth getting right before it turns into a bigger cleanup job later.

With full ratchet: Founder loses 35% ownership

With full ratchet: Founder loses 35% ownership. It sounds minor until it isn't, usually right when an investor or new hire is looking at the numbers.

With broad-based: Founder loses 15% ownership

With broad-based: Founder loses 15% ownership. Get this wrong early and it compounds quietly until your next round forces the issue.

Difference: Millions of dollars at exit

Difference: Millions of dollars at exit. This is exactly the kind of detail that's easy to skip and expensive to fix retroactively.

Lovie's Anti-Dilution Impact Tool

Lovie's Anti-Dilution Impact Tool. Here's what that covers: input your series a terms, model down round scenario, and how it plays out in practice.

Input your series A terms

Input your series A terms. Get this wrong early and it compounds quietly until your next round forces the issue.

Model down round scenario

Model down round scenario. This is exactly the kind of detail that's easy to skip and expensive to fix retroactively.

See full ratchet vs broad-based impact

See full ratchet vs broad-based impact. Most spreadsheet-based cap tables miss this until someone asks a question they can't answer on the spot.

Understand negotiation leverage points

Understand negotiation leverage points. This is the step most founders underestimate — worth getting right before it turns into a bigger cleanup job later.

One-click comparison to market standards

One-click comparison to market standards. It sounds minor until it isn't, usually right when an investor or new hire is looking at the numbers.

Red Flags in Anti-Dilution Terms

Red Flags in Anti-Dilution Terms. Here's what that covers: full ratchet language in term sheet, anti-dilution that applies to option pool changes, and how it plays out in practice.

Full ratchet language in term sheet

Full ratchet language in term sheet. Most spreadsheet-based cap tables miss this until someone asks a question they can't answer on the spot.

Anti-dilution that applies to option pool changes

Anti-dilution that applies to option pool changes. This is the step most founders underestimate — worth getting right before it turns into a bigger cleanup job later.

Multiple trigger events

Multiple trigger events. — specifically, not just new funding.

No carve-outs or exceptions

No carve-outs or exceptions. Get this wrong early and it compounds quietly until your next round forces the issue.

Competitor Gap

Competitor Gap. Here's what that covers: carta: mentions anti-dilution in context, no modeling, pulley: limited anti-dilution guidance, and how it plays out in practice.

Carta: Mentions anti-dilution in context, no modeling

Carta: Mentions anti-dilution in context, no modeling. It sounds minor until it isn't, usually right when an investor or new hire is looking at the numbers.

Pulley: Limited anti-dilution guidance

Pulley: Limited anti-dilution guidance. Get this wrong early and it compounds quietly until your next round forces the issue.

Lovie: Interactive modeling + negotiation guidance + term sheet review checklist

Lovie: Interactive modeling + negotiation guidance + term sheet review checklist. This is exactly the kind of detail that's easy to skip and expensive to fix retroactively.

None of this has to live in a spreadsheet you're afraid to open. For more on anti-dilution protection founder vs investor, Lovie Cap Table is built to handle it alongside formation, funding, and equity tracking — not as three separate tools. It also covers anti-dilution protection founder vs investor basics.