How to Connect With YC Companies Before Demo Day
Pre-Demo-Day outreach to Y Combinator founders converts at multiples of the post-Demo-Day rush. Here is the timing, the tactics, and the templates that work.
Demo Day is the loudest day of the year for any Y Combinator batch. Hundreds of investors fight over allocation. Sales teams blast templated cold emails. Recruiters spam LinkedIn. Most messages get ignored — founder inboxes are simply overwhelmed.
The smart move is to skip the rush. The 8 weeks before Demo Day is when YC founders are most reachable, most receptive, and most open to being shaped — whether that means choosing your tool, taking your meeting, or accepting your investment.
This guide covers the YC batch calendar, why pre-Demo-Day timing wins, and the exact tactics for investors, sales teams, and recruiters. The fastest place to start: VCBacked's Y Combinator database with the current batch, verified founder emails, and filter by industry and location.
Contents
The YC Demo Day calendar
YC runs two batches per year on a predictable cadence. Knowing the rhythm is the foundation of pre-Demo-Day outreach:
| Batch | Starts | Companies announced | Demo Day |
|---|---|---|---|
| Winter (W) | Mid-January | Late January / early February | Late March / early April |
| Summer (S) | Mid-June | Late June / early July | Late August / early September |
The 8 weeks between “companies announced” and “Demo Day” is the outreach window. By the time founders post on Twitter/X about their Demo Day investor meetings, the window is closed.
Browse current and past batches on VCBacked at /yc — filter by batch (W26, S25, W25, etc.), industry, and location.
Why before Demo Day beats after
Inbox volume is 10x lower
In the week of Demo Day, a typical YC founder receives 200–500 inbound emails. In the weeks before, that number is closer to 20–50. The math is brutal: your message is competing with 10–20 others, not 200. Reply rates reflect that ratio.
Founders are still deciding
In the first half of the batch, founders are still choosing their stack, their cap table strategy, their first 3 hires. By Demo Day, most of those decisions are locked. If you want to be considered, you have to be considered before the decision is made.
No competitive pressure
Post-Demo-Day, every conversation has a clock. Pre-Demo-Day, founders have time to actually evaluate. For investors, that means real diligence conversations instead of 20-minute speed dates. For sales teams, that means demos and trials instead of LinkedIn DMs being ghosted.
How to find the current batch
- YC's public directory. ycombinator.com/companies lists batches that have opted in. Coverage is partial during active batches — founders sometimes opt out until Demo Day.
- VCBacked's YC database. The /yc page indexes every batch including the current one, with founder names, verified emails, industry, and HQ. Filter by batch, industry, or location.
- Twitter/X. Founders often announce their YC acceptance on day one. Search “just got into YC”, “going to YC”, or the batch code (e.g. “S26”) sorted by latest.
- LinkedIn. “Y Combinator” in current role + filter by start date within the last 8 weeks surfaces most batchmates.
- YC alumni Slack. If you have any YC alum in your network, ask them to share the batch list — it circulates internally early.
Tactics for investors
YC restricts active fundraising conversations until Demo Day or until the founder opts out of the standard deal terms. That does not mean you cannot build relationships. The best pre-Demo-Day investor playbook:
- Track the batch on day one. Pull the batch list as soon as it's public. Tag the 10–20 companies that match your thesis.
- Reach out with value, not a pitch. “I love what you're building, here's a customer intro” converts. “Let's grab coffee to discuss your round” gets archived.
- Use batchmate intros. If you have invested in earlier YC batches, ask portfolio founders if they know the current batchmates you're targeting. Batch ties are stronger than any cold relationship.
- Time your hard ask. 2–3 weeks before Demo Day is the sweet spot — founders are doing investor practice meetings and want feedback. After that, you're competing with everyone.
- Show up at the right events. YC hosts founder dinners, partner office hours, and informal industry mixers during the batch. If you can attend one, the relationship-building beats any email sequence.
For deeper context on sourcing, how VCs source deals and best YC startups to invest in cover the broader playbook.
Tactics for sales teams
YC companies during the batch are at peak buying intent for engineering, ops, and go-to-market tools. They have YC's standard $500K, their team is small (typically 2–5 people), and they are deciding what their stack will look like for the next 12 months. Win them now, and you have a 3-year customer.
- Be specific about why this company. Reference their one-liner, their problem, their stack. Generic batch blasts get filtered.
- Offer a YC-batch discount. Even nominal — “free for the first year, then half off” is enough signal that you understand the stage.
- Lead with the use case, not the product. “Here's how the last 5 YC companies in your space solved X” is more credible than a feature list.
- Skip the demo request. Founders during the batch don't have 30 minutes for a sales call. Offer a 5-minute Loom or a self-serve trial.
- Move fast. Reply windows are short — if they say yes, get a contract or onboarding link in their inbox within 24 hours.
See also: sales prospecting with funding data and how to prospect recently funded startups.
Tactics for recruiters
YC companies during the batch are not yet hiring at scale — most have 2–5 people and don't plan their first “real” hires until after they raise post-Demo-Day. The pre-Demo-Day opportunity for recruiters is different:
- Build the relationship now, place after Demo Day. Founders remember which recruiters showed up before the bidding war. Reach out with no immediate ask.
- Offer talent intros, not retained searches. A specific candidate intro at the right moment outperforms a generic pitch.
- Map their network needs. “You're building X — I know a founding engineer who left [adjacent company] last month” lands every time.
- Plan for the 6-week-post-Demo-Day window. That is when most YC companies start their first 3–5 hires. Be top of mind before that window opens.
Cold email templates that work
Subject: Loved your YC one-liner — quick thought Hi [first name], Saw you're in S26 working on [exact one-liner]. We've backed [2 relevant portfolio companies] in the same space and have strong opinions on [specific go-to-market or product question relevant to their thesis]. Happy to share what we've learned with no expectations. No pitch — just useful context for what you're building. 15 min on Zoom this week? [your name] [fund] — [URL]
Subject: [tool category] for [their problem] Hi [first name], Congrats on the S26 batch — [reference their one-liner]. [Tool] saves teams like yours [specific outcome, e.g. "10 hours/week on customer support automation"]. We work with [2–3 YC companies in adjacent space]. YC batch deal: free for 12 months, then 50% off. No call required — here's the self-serve link: [URL] If it's useful, great. If not, no follow-up. [your name]
Subject: Founding engineer for [their problem]? Hi [first name], Saw [their company] in the S26 batch. I'm not pitching a retainer — wanted to flag one person who might be exactly right for your first founding eng hire post-Demo-Day: [name] — [3 specific bullets: company background, tech stack match, why they're leaving] If you'd like an intro, happy to set it up. If now's not the right time, I'll check back after Demo Day. [your name]
For more on outreach mechanics, see our how to find & contact YC founders guide.
Mistakes to avoid
- Trying to fundraise during the batch. YC's standard deal terms restrict outside fundraising until specific points in the batch. Pressuring founders to talk price gets you blacklisted.
- Templated mass emails to the whole batch. Founders compare notes. If your message is identical to 30 other inboxes, you become a meme by week 2.
- Asking for “a quick call.” Founders during the batch are protecting calendar time. Replace “jump on a call” with “here's a 90-second Loom” or “here's the self-serve link”.
- Pretending to be a customer. Some sales teams pose as “potential users” to get a foot in the door. Founders see through this immediately.
- Trying to skip the batch entirely. Some firms wait until post-Demo-Day to engage. By then, the cap table is full and the stack is locked.
Frequently asked questions
When are the next YC Demo Days?
Y Combinator runs two batches per year. Winter batches (W) have Demo Day in late March or early April. Summer batches (S) have Demo Day in late August or early September. The current Summer 2026 (S26) batch will have its Demo Day in late August or early September 2026. Companies are announced 8–10 weeks before each Demo Day.
Why reach out to YC companies before Demo Day instead of after?
Before Demo Day, YC founders receive far less inbound from investors and sales teams. Their inboxes are not yet flooded, they have more attention to give each message, and they are still shaping their go-to-market plans — which means your product, fund, or recruiting pitch can land at a moment when they are deciding what to use. After Demo Day, inbound volume jumps 10x and most cold messages are ignored or auto-archived.
How do I find the current YC batch companies before Demo Day?
YC publishes the current batch on its public company directory once founders opt in (typically 4–6 weeks before Demo Day). The full database with contact info is available at vcbacked.co/yc, including the current batch with founder names, one-liners, industry, location, and verified emails.
Is it appropriate to cold email a YC founder during the batch?
Yes, with two caveats. First, keep it short and relevant — under 100 words, no attachments, no calendars. Second, do not pitch them on raising money during the batch (YC restricts fundraising conversations until standard deals are set). Sales, recruiting, and partnership outreach are welcome and often very well received during the batch because founders are deciding on stacks and vendors.
How early before Demo Day should I reach out?
For investors: start tracking the batch the day it is announced, but hold off on hard pitches until 2–3 weeks before Demo Day when founders are testing investor conversations. For sales and partnerships: reach out 6–8 weeks before Demo Day, when founders are building their MVP infrastructure and choosing tools. For recruiters: any time during the batch is fine, but the best response rates are 1–3 weeks after Demo Day when founders have raised and are scaling teams.
What is the best way to find a warm intro to a YC founder?
Three reliable paths: (1) YC alumni from earlier batches in the same industry are usually willing to make intros — search vcbacked.co/yc by industry; (2) YC partners can refer if your offering is relevant — but they are extremely busy during the batch; (3) Investors who have already backed companies in the current batch can intro to other batchmates. The single most effective intro path is from a batchmate of the founder you want to reach.
Get the current YC batch
VCBacked indexes every YC batch with founder names, verified emails, one-liners, industry, and location. Filter the current batch, the last 3 batches, or any historical batch back to 2005.