The quality of your investor list decides the quality of your raise before you send a single email. A list of 200 investors who actually write cheques at your stage, in your sector, in your geography, will outperform a list of 1,000 names scraped from a directory every single time. This guide covers how to build that list: setting criteria, finding names, qualifying them, verifying contact details, sizing the list and tiering it for outreach. It is step three of the wider process we cover in how to raise a seed round.
1. Define your criteria before you collect a single name
Most founders build lists backwards: they gather names first, then wonder why nobody replies. Start instead with four filters, and only names that pass all four earn a place:
- Stage: do they lead or follow rounds at your stage? A growth fund will not write your first cheque, however friendly the partner. If you are unsure which stage you are actually at, read pre-seed vs seed first, because the two lists barely overlap.
- Sector: have they backed companies in your space in the last few years? A thesis on their website is weaker evidence than a portfolio logo.
- Geography: do they invest where you are incorporated? Many funds have hard geographic mandates, and no pitch overrides a mandate.
- Cheque size: does your round fit their model? A fund writing £5M cheques cannot lead your £750k round, and a £25k angel cannot anchor it.
Write these four filters down before you open a browser tab. They are the difference between research and collecting.
2. Where the names actually come from
Good lists are assembled from several sources, not one:
- Comparable companies: find startups one stage ahead of you in your sector and look up who funded them. Those investors have already demonstrated appetite for your market.
- Recent round announcements: investors who announced a deal in your space in the last twelve months are actively deploying, which is exactly what you want.
- Founder referrals: ask founders in your network which investors moved quickly and behaved well. This is also how you learn who to avoid.
- Angels and syndicates: operators in your niche often invest personally and can open fund doors later.
- Databases and matching tools: directories give you breadth, but treat them as raw material to qualify, not a finished list. Investor matching compresses this step by filtering a pool of 18,000+ investors against your sector, stage, geography and ticket size in minutes rather than weeks.
3. Qualify hard: recent activity beats logos
A famous firm name on your list feels reassuring and means almost nothing. What predicts a reply is recency. An investor who closed two deals in your sector this year is worth ten investors whose relevant portfolio logo is from 2019. When qualifying, ask: have they deployed in the last twelve months? Is their fund young enough to still be making new investments? Do they lead, or only follow once someone else has priced the round? A list weighted towards active, in-mandate investors converts; a list weighted towards prestige does not.
4. Verify every email before you send anything
This is the step almost everyone skips, and it quietly ruins raises. Published investor emails rot: people change funds, funds change domains, inboxes get shut down. When dealOS verified over 16,000 published investor emails, roughly 17 percent were dead or invalid. Send to an unverified list and nearly one in five of your carefully written emails bounces. Worse, mail providers read a high bounce rate as a spam signal, so your remaining emails start missing inboxes too. Verify first, or route your sending through a platform that only surfaces verified addresses, as investor outreach does.
5. How big should the list be?
For a seed round, aim for 150 to 250 qualified investors. Conversion from first contact to term sheet is low for every founder, including good ones, so a list of 40 names rarely generates enough meetings to create competition. Above 250, you are almost certainly relaxing your filters and adding names that fail one of the four criteria. If you cannot reach 150 without cheating, widen one filter deliberately, usually geography, rather than quietly abandoning all of them.
6. Tier the list and work it in waves
Not all 200 names deserve the same treatment. Split the list into three tiers:
- Tier A: your 30 to 50 dream investors, the best fit and the strongest brands. Approach them second, once your pitch is battle-tested.
- Tier B: strong fits you would happily take. Approach a batch of them first as your practice wave.
- Tier C: plausible fits and smaller cheques. Useful for filling a round and for market signal.
Every name on the list will meet your company first through a one-page summary, so make sure yours is ready: see how to write an investment teaser. Then work the tiers in waves and follow up on a schedule rather than on mood, which we cover in investor follow-up cadence.
The short version
Fix four criteria: stage, sector, geography, cheque size. Source names from comparable companies, recent deals, referrals and databases. Qualify on recent activity, not logos. Verify every email, because around 17 percent of published ones are dead. Build to 150 to 250 names for seed, tier them, and work the list in waves. If you would rather compress the research from weeks to an afternoon, dealOS builds a qualified, verified list from your deck, and pricing starts free.