FounderHQ Weekly · YC Winter 2027
The deadline is 12 days away. We read the public breakdowns of the latest cohorts to see what an application has to prove.
Winter 2027 deadline
Nov 2, 8pm PT
12 days from Oct 21. The deadline is firm.
Why it matters
Y Combinator is one of the largest early-stage programs in the world
YC says it has funded thousands of companies with a combined valuation above $1 trillion. It now runs four batches a year, and the first three batches of 2026 alone added more than 600 companies.
- Winter199
- Spring196
- Summer236
Companies per YC batch, 2026.
Why should an early-stage startup care?
- Seed funding at the earliest stage. YC provides seed funding for startups.
- A network that actually helps. The alumni network is huge, with a strong ethos of helping fellow YC founders.
- Help with the next round. Near the end of the program, YC introduces startups to investors in its network, and each company gets a YC general partner.
- The application is useful on its own. One founder who went through it said the application process itself is valuable. You have to explain what you're building in plain words.
- Second tries work. According to notes from a Michael Seibel webinar, a lot of companies get in on their second or third application, and one founder got in on the eighth.
It isn't for everyone. Admission is competitive, and the batch is in person in San Francisco. But if you're building something ambitious and can relocate, it's worth a serious application.
The Winter 2027 deadline is November 2 at 8pm PT, 12 days from today. So we went through the public breakdowns of the latest cohorts to see what the applications have to prove. One note on scope: YC doesn't publish accepted applications, and the 2027 batches haven't been chosen yet. We looked at the latest batches that exist and worked backwards.
The cohort
What the cohort looks like
- 236
Summer 2026 is big. It has 236 companies, one of the largest recent batches.
- 91%
AI is the baseline, not the pitch. One public tally has 91% of Summer 2026 tied to AI, but the application layer fell from 55% to 39% while model companies grew from 8% to 20%.
- 24%
Physical is rising. Industrials doubled from 12% to 24% in that tally. Third-party counts of Fall 2026 put AI infrastructure and robotics at roughly 32 companies each, with about 33 in vertical B2B and AI apps.
- 4%
Consumer is nearly gone. Only 4% of the 478 companies funded in 2026 are consumer, and 61% are B2B.
- 84%
Founders are technical and young. 84% of Summer 2026 founders have a technical background, and 37% are students or recent graduates.
- 65%
Two cofounders is the default. 65% of Winter 2026 teams had exactly two cofounders, and only 22 of 199 companies were solo.
The patterns
Five patterns worth copying
- 1
Name a customer and a job
Fall 2026 includes AI order entry for food distributors, AI compliance for affordable housing, and an AI-native claims administrator starting with workers comp. Each one says who it's for and what the software does. Compare that with "AI platform for businesses." Generic crowds lose: sales and marketing AI dropped from 18 companies to 6 in Summer 2026.
- 2
Prove you can build
Paul Graham has said he cares more about the founders than the idea, because most funded startups change their idea significantly. Michael Seibel looks early at whether the founding team can build the software. Show what you shipped, not what you plan to ship. The bar is also rising: three times as many Winter 2026 companies reached $1M in annualized revenue as in Winter 2025. If you have a number, give it a date.
- 3
Show why you
Seibel says the founders YC likes tend to have personal experience with the problem, which makes them either experts or intensely motivated. Look at Atomarine, a Summer 2026 standout. Its cofounders bring computer science and naval engineering, plus nuclear engineering research. The team fits the problem.
- 4
Make your team story clear
YC asks how long the cofounders have known each other. Solo is possible but harder. YC's Dalton Caldwell has said even funded solo founders have a very hard time. One analysis found the apparent solo-founder penalty disappears once you control for batch year, but partners will still probe it. If you're solo, say how you cover the gaps.
- 5
Write plainly
Seibel's advice is to use the simplest language, since the reader shouldn't need to look words up. Caldwell says he wants clear, direct writing and that you don't need dozens of hours on the application.
The takeaway
The part most founders get backwards
Most founders over-prepare the "I can run and scale a company" story. YC coaches that during the batch. What it can't coach is whether you can deliver the thing you're working on.
Nobody outside YC knows the exact weighting, and we won't pretend to. But the partners' own writing keeps pointing at the founders first, and what they look for is evidence that you can build and finish. Put your application's weight there.
The plan
Your 12-day checklist
- Day 1
Run the free YC Readiness Check (link below) to see which areas look weakest.
- Days 1 to 2
Write your one-liner (customer, job, how). Test it on someone outside your industry.
- Days 2 to 4
List everything you shipped in the last 30 days, with links and numbers.
- Days 4 to 6
Write why you, in three true sentences.
- Days 6 to 8
Write the team section: who builds what, how long you've known each other. If you're solo, say how you cover the gaps.
- Days 8 to 10
Gather traction with dates: users, revenue, pilots, letters of intent.
- Days 10 to 11
Record the video and cut the fluff.
- Day 11
Submit a day early. The deadline is 8pm PT and it's firm.
Where we come in
Get ready, then write it yourself
FounderHQ is a fundability consultancy for pre-seed and seed-stage founders. We help startups become investor-ready: sharper positioning, financial clarity, and a story that holds up when someone checks it. We've assessed 1,100+ startups, and we turn what we see into free tools.
For YC, our main purpose is simple: help you get ready and prepare the application yourself. That's why we built the free YC Readiness Check. Answer a few questions (about 10 minutes, no card) and you get a report scoring your founders, product, traction, market, evidence and application strength. It shows the gaps YC is most likely to probe and what to fix before you submit.
Run the free YC Readiness Checkthefounderhq.com/yc-application-review
Use it, fix the weak spots, and write the application yourself. If you'd like a little extra support, you can always reach out. That part is paid, and the details are on the same page. The readiness check itself costs nothing.
The check is a self-reported diagnostic, not a prediction of admission. FounderHQ isn't affiliated with Y Combinator.
Frequently asked questions
YC Winter 2027 application FAQs
When is the YC Winter 2027 application deadline?
The article lists November 2, 2026 at 8:00 p.m. Pacific Time as the Winter 2027 deadline. Check YC's official application page for the latest instructions before submitting.
Can a solo founder apply to Y Combinator?
Yes. YC has funded solo founders. The article notes that most Winter 2026 startups had two cofounders, so solo founders should be ready to explain how they will cover technical, operational and business gaps.
Do you need revenue to apply to YC?
The article does not identify revenue as a formal requirement. However, measurable evidence such as shipped products, active users, pilots and dated traction can help founders demonstrate execution.
What should a YC application focus on?
Explain who the customer is, what problem you solve, what you have already built, why your team is suited to it and what progress you can prove. Keep the writing direct and specific.
Can startups outside the United States apply?
The article notes that the YC program is in person in San Francisco. Founders based elsewhere should check the official application requirements and be prepared for the program's location expectations.
Is FounderHQ's YC Readiness Check free?
Yes. The diagnostic described here is free and self-reported. It highlights application gaps, but it does not predict YC admission and is not affiliated with Y Combinator.