What is a seed round? The European founder’s guide to seed funding
A seed round funds the search for repeatable demand - here is what European seed rounds look like, what happens to your cap table, and the honest odds of reaching Series A.
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A seed round is the stage at which a startup raises institutional capital – a €5M median in Europe, across the rounds Sesamers tracks – to prove that someone will pay for the product, and pay repeatably.
That word “repeatably” is doing most of the work. Pre-seed proves a team and a problem; seed proves demand. Series A proves a machine. The seed round is the awkward, decisive middle: enough money to build a real company, raised on evidence that is still mostly promise. Below, I walk through what seed investors are actually buying, how big European seed rounds are, what changes on your cap table at seed, what the odds of graduating to Series A honestly look like, and – the part most guides skip – when raising a seed is the wrong move for you.
What a seed round actually proves
The test at seed is not “do you have revenue”. It is “does the evidence suggest that demand exists and can be found again on purpose”. A seed-stage company typically has some combination of early paying customers, engaged usage that survives the novelty period, and a first, fragile sense of where those customers come from. What it does not yet have is a repeatable, measurable growth machine – that is what the seed money is for building.
Seed investors are therefore underwriting a hypothesis: that the early pull you are showing is the start of a pattern, not a coincidence. The diligence reflects that. Where pre-seed diligence is almost entirely about the founders, seed diligence starts to interrogate the evidence – who is paying, why did they buy, do they stay, and would the tenth customer look like the first three. It is still a judgement call, but it is a judgement call about a business rather than purely about people.
One confusion is worth clearing up, because we keep tripping over it: stage names describe proof, not cheque size. A €4M round raised on a prototype and a thesis is a big pre-seed, not a seed, whatever the press release says. The distinction matters because labels import expectations – call it a seed and investors will diligence it like one. The foundations of this stage logic are laid out in our pillar on what a startup is.
How big is a European seed round?
Across the rounds Sesamers tracks, the median European seed is €5M, from a sample of 74 rounds – the best-populated stage in our data. As always with medians, the caveats matter: announced rounds skew large, the spread is wide, and a “seed” label covers everything from a €1.5M first institutional cheque to a €10M round that would have been called a Series A a decade ago.
The direction of travel is clear, though. Bloomberg reported in March 2026 that the median European round size grew 32% from 2024 to 2025, driven substantially by US capital. And our market is consolidating around fewer, larger deals: Tech.eu counted €44.1bn invested across 1,740 European deals in H1 2026, against roughly 2,000 deals in H1 2024 – more money, fewer companies getting it. For you, the practical translation is that the bar has risen with the round sizes. Bigger cheques buy bigger expectations.
| Pre-seed | Seed | Series A | |
|---|---|---|---|
| What it proves | Team + problem | Someone pays, repeatably | A repeatable growth machine |
| Median (rounds Sesamers tracks) | €1.6M (n=33) | €5M (n=74) | €16.5M (n=26) |
| Typical structure | SAFE / convertible | Priced round (usually) | Priced round, full terms |
| What the money buys | Experiments | Evidence of repeatability | Scaling what already works |
Latest funding
| Company | Round | Lead | Sector | Amount |
|---|---|---|---|---|
| Ki 13 Climate · United Kingdom | Seed | HICO Investment Group | Climate | €4.3M |
| Conveo Martech · Belgium | Series A | DST Global Partners, Balderton Capital | Martech | €43.2M |
| iPronics Industry · Spain | Series B | Maverick Silicon, Light Street Capital | Industry | €108M |
| iPremom Health · Spain | Seed | Amadeus Capital Partners | Health | €15M |
| Pharosyn Health · United Kingdom | Seed | Moonfire Ventures | Health | €2.6M |
| HyImpulse Defence Tech · Germany | Series A | JOIN Capital, Ace Capital Partners | Defence Tech | €50M |
Seed vs pre-seed: the practical differences
So what actually changes when the round is called a seed? Three things, beyond the size gap. First, structure: while most European pre-seeds close on SAFEs, convertibles or BSA-AIR instruments, seed rounds are more often priced equity rounds – a negotiated valuation, a lead investor, a proper shareholders’ agreement, and usually a board seat. Any deferred-pricing instruments you stacked at pre-seed convert here, which is the moment you discover what those caps actually cost you.
Second, the lead investor matters more. A pre-seed can be assembled from angels one cheque at a time; a seed round usually needs an institutional lead who sets terms, takes the board seat, and – importantly – is expected by the rest of the market to support the company into the A. Choosing that lead is one of the most consequential decisions of the company’s life, and it is not primarily a price decision.
Third, the company changes. Seed money funds a real team, and with it real management obligations: reporting, budgeting, an actual plan. The scrappiness that got you to seed does not survive contact with fifteen employees.
The ESOP: what happens to your cap table at seed
The seed round is typically where the employee option pool (ESOP) is created, and we consistently underestimate how much it costs. Per Index Ventures’ “Rewarding Talent” research, companies on both sides of the Atlantic typically create a pool of around 10% at seed. The divergence comes later: US companies keep topping up – roughly 15% at Series A and 20-25% by Series D – while European companies tend to stay around 10%. We build the pool, then quietly forget to refill it; sharing the upside is one habit we should happily import. Index’s own recommendation is that Europe should be closer to the US pattern, topping up to 12%, 14% and 16% at A, B and C.
Two things to know before the term sheet arrives. One: the pool is almost always created before the round prices, which means the dilution from it lands on existing shareholders – you – rather than the incoming investor. Two: this is negotiable, or at least sizeable-to-fit. A pool sized to your actual 18-month hiring plan is a defensible counter to a round 15% demanded by default. We cover pool mechanics in our guide to startup dilution, and the offer-by-offer detail in startup employee equity in Europe.
The honest odds: seed to Series A
The reality: here is the number most seed-stage content leaves out. Dealroom followed a cohort of 3,075 European companies that raised seed funding in 2016-18 and measured how many reached a Series A: 6% within 12 months, 18% within 24 months, 27% within 36 months, and 31% within 48 months. The data is dated – the cohort predates both the 2021 bubble and the correction that followed – but it remains the most honest published benchmark for Europe, and the shape of the curve is the point: roughly one seed-funded company in four raises an A within three years, and the odds barely improve after that. I would rather you meet that number now than discover it with twelve months of runway left.
The silver lining: not raising a Series A is not the same as failing – some of the other three in four reached profitability, exited early, or built companies that simply did not need venture scale. The opportunity: plan for the statistics rather than around them. The seed round is, statistically, the last round most venture-backed companies ever raise, so a seed plan that only works if the A arrives on schedule is a plan with a 27% success rate baked in. Build the version that survives either way. We unpack the full failure-rate picture in what percentage of startups fail.
When NOT to raise a seed round
Venture seed capital is a specific tool for a specific job, and there are at least four situations where reaching for it is a mistake:
- You have not found the repeatable thing yet. If you are still searching for what people will pay for, seed money mostly buys a bigger burn rate while you search. Stay small until the evidence shows up.
- The business is good but not venture-shaped. A company heading for €5M of annual revenue and healthy margins is a success by any sane standard – and a poor fit for investors who need a shot at a 100x outcome. Selling them equity buys you a boss whose maths does not work on your business.
- You can get there on revenue or grants. Equity at seed is expensive; if customers or non-dilutive money can fund the next stage of proof, the cap table you save is your own.
- You are raising to validate rather than accelerate. A term sheet is not product-market fit. Investors are wrong constantly, in both directions.
Because the seed round was never the prize. The prize is a company where demand repeats on purpose – the round is just the fuel you buy to prove it. Raise when the evidence is ready, walk away when it is not, and make repeatability the thing you chase!
Frequently asked questions
How much is a typical seed round in Europe?
The median is €5M across the rounds Sesamers tracks (n=74), but the label covers a wide range – from small first institutional cheques to rounds nudging €10M. Announced-round samples also skew large, so the unannounced middle of the market sits below that figure.
What do seed investors look for?
Evidence that demand is real and starting to repeat: paying customers or seriously engaged users, early retention, and a founder who can explain where the next ten customers come from. Team quality still dominates, but at seed the evidence has to carry part of the argument.
How long should a seed round last?
The usual rule of thumb is 18-24 months of runway: long enough to build Series A evidence, plus a raise that typically takes three to six months – and you want to start that raise with at least nine months of runway left, not fumes.
What percentage of seed-funded startups reach Series A?
In Dealroom’s cohort of 3,075 European companies seed-funded in 2016-18 – dated, but the best published European benchmark – 27% raised a Series A within 36 months and 31% within 48. Roughly one in four, within the window that matters.
Keep going
For the stage logic underneath all of this, start with what is a startup. Then look one stage back at what pre-seed funding is, one stage forward at what Series A takes, and at what the pool means for your team in startup employee equity in Europe. For the numbers behind our medians, see the fundraising data hub.
