YC Summer 2027 (S27) Batch: Dates and How to Apply
YC has not confirmed the dates of its Summer 2027 batch (S27) yet. If it keeps the calendar of Summer 2026 (closed on May 4, 2026), expect the on-time deadline around May 3, 2027 at 8pm PT, decisions around June 4, 2027, and the batch to run July to September 2027 in San Francisco. You can already apply for it through YC's Early Decision.
Expected dates repeat the Summer 2026 calendar; YC confirms each batch on its apply page, and this page then shows the confirmed date.
- Batch code
- S27
- Deadline
- Around May 3, 2027 (expected)
- Decisions by
- Around June 4, 2027 (expected)
- Batch runs
- July to September 2027
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What YC invests
YC's standard deal is the same for every company it accepts: $500,000, made of $125,000 for a fixed 7% of the company plus $375,000 on an uncapped SAFE with a most favored nation (MFN) clause, which takes the terms of the next SAFEs you issue.
How to apply to S27
The last Summer batch: Summer 2026 (S26)
Summer 2026 has 233 companies in this directory. The most common industries: B2B, Industrials and Healthcare. A sample of the batch, top companies first:
Applying to YC? Study these applications first.
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Frequently Asked Questions
When is the YC S27 application deadline?
YC has not confirmed it yet. The last Summer batch with published dates, Summer 2026, closed on May 4, 2026, and YC deadlines fall on a Monday, so expect the S27 deadline around May 3, 2027 at 8pm PT. This page switches to the confirmed date the day YC publishes it.
When does the YC Summer 2027 batch start?
If YC keeps its usual calendar, the Summer 2027 batch (S27) runs July to September 2027 in San Francisco.
Can I apply to YC S27 now?
Yes. Besides the batch it is filling now, YC takes applications for its coming batches through Early Decision, so you can apply for S27 before its own deadline is announced.
Can I apply to YC after the deadline?
Yes. YC keeps reading applications submitted after the deadline. It does not promise a reply date for late applications, and says most of them get a decision within a month.
How much does YC invest in S27 companies?
On YC's standard deal today, $500,000: $125,000 for a fixed 7% of the company plus $375,000 on an uncapped MFN SAFE. YC offers the same deal to every company it accepts.
What is Round Funded?
Round Funded is an investor database and outreach platform for startup founders. It lists 60,000+ active investors with verified contacts, filtered to recent investment activity, and lets founders send personalized pitches from their own Gmail, track replies, and share a free Data Room. Round+ starts at $99 per month with a 3-day trial.