How to Structure a CTO Equity Package at Every Startup Stage: Seed to Series B
How to Structure a CTO Equity Package at Every Startup Stage
A CTO equity package tells your technical co-founder or first engineering hire how much you actually value them - not in words, but in numbers on a cap table. Get it wrong and you either lose them to a competitor who got it right, or you overpay and tie your hands when you genuinely need to hire later. The market benchmarks in 2026 are clear: seed-stage CTOs command 2-4% (3% is the midpoint), Series A lands at 1-1.5% median, and Series B typically settles at 0.3-0.8% - all subject to dilution, vesting structure, and whether the person is a co-founder or a hired hand.
First, settle the co-founder vs hired CTO question
These are two completely different conversations and conflating them is the first mistake most founders make.
If someone has been with you since day one - building alongside you, taking the risk, taking below-market salary - they're a co-founder. Co-founder CTOs typically hold 10-25% at incorporation, on standard 4-year reverse vesting with a 1-year cliff. That range is wide because it depends on when they joined, whether there's a product already, and how many co-founders there are. A 50/50 split between a technical and non-technical founder is perfectly normal at pre-seed.
If you're hiring a CTO into an existing company - even a very early one - you're looking at a completely different number. The benchmarks below apply here. The key distinction is risk: a hired CTO has a salary floor, defined scope, and reduced personal liability. A co-founder CTO does not. Equity is the compensation for that asymmetric risk, so the numbers reflect that.
CTO equity benchmarks by funding stage
These are current 2026 market benchmarks based on TopStartups compensation data, Index Ventures' Rewarding Talent guide, and the DigitalDefynd CTO equity analysis. These are pre-dilution fully-diluted percentages at the time of grant:
| Stage | Typical Range | Market Midpoint | Exceptional (top quartile) | Red flag (below this) |
|---|---|---|---|---|
| Pre-seed (co-founder) | 10-25% | 15-20% | 25%+ | 5% |
| Seed (hired CTO) | 2-4% | 3% | 4-5% | 1% |
| Series A | 1-2% | 1.25-1.5% | 2%+ | 0.5% |
| Series B | 0.3-0.8% | 0.5% | 0.8-1% | 0.25% |
The "red flag" column matters. Below 0.5% at Series A will show up in retention problems. Not immediately - it'll surface 18 months later when your CTO gets a better offer elsewhere and does the maths on what staying actually costs them. Fix it before that happens, not after.
One thing worth noting: these percentages look small, but in terms of expected value they're substantial. A 1.5% stake in a company that exits at £100M is £1.5M pre-tax. At Series A valuations in 2026 (often £15-50M), that 1.5% represents £225K-£750K of current paper value. The number isn't the whole story - the company's trajectory and the vesting terms matter just as much.
Vesting: the part founders get wrong most often
Standard market vesting is: 4 years, 1-year cliff, monthly thereafter. No cliff means you're giving someone real equity on day two before they've proved anything. A 5 or 6-year vest is trying to lock someone in on unfair terms. Four years is the standard - stick to it.
The cliff means: if the CTO leaves before month 12, they vest nothing. On the cliff date, 25% vests. After that, 1/48th vests each month until month 48. This protects both sides - the company doesn't hand out equity to someone who leaves after three months, and the CTO has a clear visible milestone to work towards.
For UK startups specifically, this often takes the form of reverse vesting rather than traditional options. The CTO receives shares at incorporation but the company retains a right to repurchase unvested shares if they leave. This is a structural difference from US-style options, but the economic effect is the same. UK lawyers will push you towards one or the other depending on your circumstances - HMRC has views here, especially around EMI schemes.
One increasingly common ask from experienced candidates: extended exercise windows. The traditional 90-day window after departure forces someone to either write a large cheque to exercise their vested options or forfeit years of work. Extended windows of 1-5 years (sometimes 10 years in edge cases) are increasingly market standard for senior hires and cost you nothing unless the company succeeds. If you're pushing back on this, ask yourself why.
The UK-specific piece: EMI schemes in 2026
If you're a UK startup, the Enterprise Management Incentive (EMI) scheme should be your default for issuing CTO options. It's HMRC-approved, tax-efficient, and as of 6 April 2026, significantly more accessible than before.
The changes that matter: the gross assets threshold quadrupled from £30M to £120M, and the employee headcount limit doubled from 250 to 500. That means the vast majority of startups through Series B can now use EMI. If you're under that threshold and still issuing unapproved options, you're almost certainly leaving money on the table - both for the company and the CTO you're trying to retain.
The key tax advantage: Business Asset Disposal Relief reduces capital gains tax to 18% on the first £1M of qualifying lifetime gains from April 2026. For a CTO exiting with a meaningful stake, that's the difference between keeping £820K of a £1M gain versus paying 24% CGT (£760K). Not trivial.
To use EMI, the CTO must spend at least 25 hours per week or 75% of their working time at the company, can't hold more than 30% of shares, and can't receive options worth more than £250,000 at the time of grant. That £250K limit trips people up - if the company valuation has grown, you may hit it faster than expected and need to issue the remainder as unapproved options. Model this out before the grant date, not after.
What happens to CTO equity through fundraising rounds
This is where the real maths lives, and most founders don't walk their CTO through it at grant time. They should.
Seed rounds typically dilute existing shareholders by 15-25%. Series A adds another 20-30%. Series B another 15-25%. By Series B, median combined founder ownership is around 25-30% - meaning roughly 70-75% dilution from the original cap table.
Take a CTO hired at seed with 3%. After a standard Series A round (25% dilution), they're at approximately 2.25%. After a Series B (another 20%), they're at roughly 1.8%. That's still a meaningful number at a Series B-stage valuation - but the CTO should know this trajectory upfront, not discover it after the fact when they're frustrated about dilution they didn't understand.
Anti-dilution provisions are typically reserved for investors, not employees - don't promise them to your CTO. What you can do is top up the option pool at each round with a refresh grant. This is normal practice at Series A and B: if your CTO has performed well, a top-up grant at the new stage pricing is both fair and good retention practice. Many investors will expect to see this in the option pool allocation anyway.
| Approach | Typical agency or non-CTO-led startup | CTO-led approach (Metamindz advisory) |
|---|---|---|
| Equity benchmarking | Founder guesses or uses generic templates | Benchmarked against 2026 market data by stage and role |
| Vesting structure | Copy-pasted from a template with no customisation | Tailored vesting to reflect actual risk and contribution timeline |
| UK tax efficiency | EMI scheme used reactively, often too late | EMI structured proactively before valuation limits become a problem |
| Dilution modelling | CTO discovers dilution post-round, creates resentment | Full cap table modelling shared with CTO at grant time |
| Refresh grants | Forgotten until CTO is already looking elsewhere | Structured into round negotiations as standard retention practice |
| Exercise window | 90-day default retained without discussion | Extended window (2-5 years) negotiated as standard |
Red flags in a CTO equity offer - both sides
Whether you're a founder structuring an offer or a CTO evaluating one, here's what should give you pause:
For CTOs evaluating an offer: Back-loaded vesting (most equity vests in years 3 and 4) is designed to lock you in on unfair terms. A 90-day exercise window post-departure is punitive. Clawback provisions that apply beyond fraud or cause should be challenged. Vesting that restarts on acquisition effectively zeroes out your equity in an exit scenario - this is a hard no. And no cliff is actually not in your interest either - it signals the founders haven't thought this through properly, which tells you something about how they'll structure other agreements.
For founders making the offer: Below-market equity creates slow-burn resentment that surfaces at the worst possible time - usually during a fundraise when you can least afford internal tension. Options without EMI structuring cost your CTO real money post-exit. Failing to model dilution for your CTO before they sign means they'll feel misled later, even if nothing was dishonest. And if you can't answer basic questions about your cap table, that's a signal worth addressing before you hire a senior technical leader.
The fractional CTO angle
One pattern I see regularly: seed-stage founders who can't yet justify a full-time CTO try to give a fractional CTO equity as compensation for a lower cash rate. Sometimes this works. More often it creates complications.
A fractional CTO working 4-8 hours per month is not taking co-founder-level risk and shouldn't receive co-founder-level equity. 0.1-0.5% is a reasonable advisory grant for a genuinely embedded fractional CTO on a multi-year engagement. Anything more than that and you're creating a structural problem on your cap table that will confuse future investors.
The cleaner model - and the one we use at Metamindz - is a cash retainer at a fair market rate. That keeps the cap table clean, aligns incentives properly (you want someone focused on outcomes, not paper valuation), and doesn't create the awkward conversation when that person's engagement naturally ends. If you genuinely want to give equity to a fractional CTO, treat it like an advisor grant: 0.1-0.25% on a 2-year vest with no cliff, typically SAFE note or unapproved options at pre-seed.
When you're ready to bring on a full-time CTO - which typically happens between late Seed and Series A - the benchmarks above apply. That transition is one of the things we help founders think through as part of our CTO-led recruitment process: what's the right equity package, what does the vesting structure look like, and how does this person fit into the cap table you've built so far.
A practical checklist before you make the offer
Before putting anything in writing, confirm you've done these:
1. Benchmarked the percentage against current market data for your stage (not last year's data - valuations and competition have shifted).
2. Modelled the post-dilution ownership through your next 2-3 rounds so you can walk the CTO through what their stake looks like at exit.
3. Checked EMI eligibility - company gross assets under £120M, fewer than 500 employees, and the CTO will be working at least 25 hours/week or 75% of their time at the company.
4. Set a sensible exercise window - 2-5 years post-departure is increasingly market standard.
5. Agreed on refresh grant timing - typically at Series A, B, or on a significant role expansion.
6. Got a lawyer who has actually done this before. Not your general commercial solicitor. Someone who does startup equity specifically.
Frequently Asked Questions
How much equity should a CTO get at seed stage?
A hired CTO joining a seed-stage startup typically receives 2-4% equity, with 3% representing the 2026 market midpoint. A technical co-founder who joined at pre-seed should expect significantly more - typically 10-25% depending on the number of co-founders and how early they came in. These are pre-dilution figures at the time of grant.
What is the standard vesting schedule for a startup CTO?
The market standard is 4 years with a 1-year cliff and monthly vesting thereafter. At the 1-year mark, 25% vests at once (the cliff). After that, 1/48th vests each month until month 48. Anything shorter than 4 years is unusual; anything longer (5-6 years) is a red flag designed to lock you in on unfair terms.
Should UK startups use EMI options for CTO equity?
Yes, for the vast majority of UK startups. As of April 2026, EMI eligibility expanded to companies with up to £120M in gross assets and 500 employees, making it accessible through Series B for most startups. The Business Asset Disposal Relief tax advantage (18% CGT on first £1M qualifying gains) is significant - worth structuring correctly from the start rather than fixing it reactively post-growth.
How does fundraising dilute CTO equity?
Each funding round dilutes all existing shareholders proportionally. Seed rounds typically cause 15-25% dilution, Series A another 20-30%, Series B another 15-25%. A CTO starting with 3% at seed will typically hold around 1.7-2% by Series B. This is normal and expected - but founders should model and share this trajectory with their CTO at grant time, not leave them to discover it after the fact.
When should a fractional CTO receive equity instead of a cash retainer?
A fractional CTO working 4-8 hours per month is taking advisory-level risk and should receive advisory-level equity: 0.1-0.5% maximum on a 2-year vest with no cliff. For a genuinely embedded fractional CTO on a multi-year engagement, this can go slightly higher. Beyond that, the cleaner structure is a cash retainer - it keeps the cap table clean for future investors and avoids awkward conversations when the engagement ends.