Week 12 of 12 · Phase 3: Raise and Demo Day

Week 12: Demo Day, the follow-up, and what comes after the batch

45 min to read · the doing takes the week0/6Start the challenge to see your dates →
This week in short

The batch ends with Demo Day: about a minute on stage in front of an invite-only room of investors, then a few intense weeks of meetings and closing, with YC partners helping. This week you present your pitch live or publicly, follow up within a day, run a short close, and send a 12-week retrospective update.

Week 12 challenge · Raise and Demo Day

The Demo Day and retrospective challenge

Give your 60-second pitch live to a room or call of at least five investors, mentors or founders, or publish it as a public video. Follow up with everyone who showed interest within 24 hours, and send a 12-week retrospective update to everyone who has followed your weekly updates.

You pass when
The date and audience of your pitch (or the public link), a tracker of every follow-up sent within 24 hours with the reply and next step, and a sent retrospective with your number at week 1 and week 12, your average weekly growth rate, your default-alive status and one specific ask.
Why YC founders do this
YC’s Demo Day, followed by the weeks of meetings its about page describes, and Geoff Ralston’s “A Guide to Seed Fundraising” (YC, 2016) on getting signatures and money in fast.
How to do it this week ↓

YC does not publish a day-by-day calendar. We rebuilt the structure from YC’s pages, partner talks and founders’ accounts; every claim is labelled documented or reported. Unofficial, not affiliated with Y Combinator.

Inside YC · around week 12

What happens inside YC this week

Documented by YC, its partners or Paul Graham

YC’s Demo Day page says the Fall 2026 Demo Day is on Wednesday, December 2, and that the batch presents to an invite-only audience of about 1,500 investors and media; YC’s Demo Day FAQ, checked the same day, says about 1,000, so YC’s own pages disagree. The FAQ says Demo Day is in person in San Francisco, that invitations are generated by software based on investors’ recent investments in YC startups and their relationship with YC, and that people who can’t attend use the Demo Day website. When YC brought in-person Demo Day back in 2024, TechCrunch reported that Garry Tan limited seats to decision-making investors who had put at least $50,000 into YC companies in the previous two years.

YC’s about page describes what follows: “In the weeks following Demo Day we keep in close touch with the startups as they negotiate the fundraising maze”. The page says partners help founders decipher investors’ sometimes deliberately ambiguous replies, and often talk to investors themselves to find out what they really think. Aditya Jayaprakash of Blacksmith (W24) wrote that partner Jared Friedman helped them negotiate, even over a weekend, and that once they had a lead offer, their conversion rate with other firms went from near zero to over 80%.

Some companies close fast. Jeffrey Ip of Confident AI (W25) wrote that in the week before his March 12, 2025 Demo Day his team got zero yeses from 20 calls on the Monday, then had raised enough to close by 3pm on Friday, in a round that ended oversubscribed at $2.2M. His aim was to “close the round ASAP” and get back to work. Others take longer: Daniel Aisen of Proof (S19) wrote that he held 130 pitch meetings over a little more than a month.

The batch ends but the support continues. YC’s about page says office hours run year round for startups from every past batch, and founders keep Bookface, the alumni network, a yearly reunion, Alumni Demo Day and discounts on over 100 products. YC does not publish what share of each batch closes a round, or how fast.

2 frameworks · explained here in full

This week’s frameworks

After Demo Day: follow up the same day, close fast, get back to work

Geoff Ralston, former YC president (“A Guide to Seed Fundraising”, 2016), and Paul Graham (“How to Raise Money”, 2013), as YC founders describe using them

Demo Day only gets you meetings. Ralston’s guide says the goal of a first meeting is the next meeting, and that you should never leave one without at least trying to close or agreeing a clear next step. Graham’s rule for reading the replies is “hear no till you hear yes”: treat every investor as a no until they make a definite offer with no conditions.

Speed matters because investors follow each other. Graham writes that getting the first substantial offer can be half the difficulty of the whole raise; after it, others move. Blacksmith’s experience in W24 shows it in numbers: near-zero conversion before a lead offer, over 80% after. Ash Rust, writing in 2025 about SendHub’s Demo Day in 2012, advises requesting meetings the same night, and talking to angels first, then seed funds, then larger funds, because angels decide fastest.

Close what is committed. Ralston: “Once an investor says that they are in, you are almost done.” Get the signature and the money as soon as possible, and don’t negotiate new terms on the spot; take the request away and get advice. Each close makes the next one faster. Graham adds: take acceptable offers rather than holding out, and stop when it gets hard to find new money. Then go back to building, which is what Confident AI’s Jeffrey Ip says his team did.

  1. 1Before you present: have your round written down (amount, cap, minimum check) and your ranked list from week 9 open.
  2. 2Within 24 hours: email everyone who showed interest. Two sentences, your one number, a link and a specific ask for a 20-minute call.
  3. 3Book meetings in one tight window. Start with angels and founders, then seed funds, then larger funds.
  4. 4End every meeting by asking what happens next and what they need to decide. Log the answer, not the mood.
  5. 5When someone says yes, send the SAFE the same day and ask for the signature and transfer that week.
  6. 6Tell the rest of your list, truthfully, how the round is going. Graham advises telling investors about the smaller investments you raise as you raise them, which also pushes them to decide.
  7. 7Set a stop date. When it arrives or the round is full, stop and go back to the product.
Illustrative: a follow-up email sent the night of the pitch
Subject: Remindr: 40 paying clinics, +15% a week

Hi Priya, thanks for coming up after my pitch today.
Remindr sends WhatsApp appointment reminders for small clinics in India. 40 clinics pay ₹999 a month, and revenue has grown 15% a week for six weeks.

We’re raising $750K on a $7.5M post-money SAFE. Could we do 20 minutes on Thursday or Friday?

Asha

Judge investors by what they do, not what they say

YC partners in “Startup Experts Share Their Investor Horror Stories” (Y Combinator, 2023)

In this YC video, YC partners describe how fundraising goes wrong and how to choose who you take money from. Their short rule for rejections: believe the no, but don’t believe the stated reason. Investors often won’t tell you the real one, so don’t rebuild your product around it; tune your pitch instead.

They describe a good investor by behaviour: respectful of your time, answers questions, decides quickly, signs the documents and wires the money quickly, then leaves you alone to build. Meetings run both ways: you are judging them too. Inside YC, founders check the investor database, where other founders review investors they have dealt with. Outside YC, ask two founders each investor has backed.

The same partners warn against treating investor excitement as a verdict on your company. Money is a tool for building, not the goal, and a founder who enjoys fundraising more than talking to users has the order wrong. That is also why the weekly update continues after the batch: it keeps the attention on the number, not the round.

  1. 1For each investor who says yes, ask two founders they have backed: did they decide fast, wire on time, and help or get in the way?
  2. 2Score each yes on four things: speed to decide, speed to wire, respect for your time, and what founders said.
  3. 3Turn down an investor whose behaviour scores badly, even if the name is famous.
  4. 4For each no, write down what you will change in the pitch, not the product.
  5. 5Once the round closes, send your investors the same short update you have sent every week.
Illustrative: scoring two yeses
Investor          Decided  Wired   Founder refs        Take?
Angel, ex-founder 2 days   5 days  “fast, helpful”      Yes
Fund, big name    3 weeks  “after   “asked for weekly     Think hard
                           legal”   decks, slow to wire”
2 talks · play here

This week’s talks

Startup Experts Share Their Investor Horror Stories
Y Combinator · 26 min

YC partners on how fundraising goes wrong, what a good investor does, and how founders use YC’s investor database. Watch before you accept any money.

Inside The Most Powerful Startup Community In The World
Y Combinator · 6 min

YC’s short tour of what stays after the batch: Bookface, batchmates and alumni. Watch it as YC’s own pitch for the network.

6 assignments · saved on this device

Your week

Do these before next week. Each one says why it matters and what done looks like.

0 of 6 done

  • Demo Day is the moment the whole batch builds to; you need a real audience, not a mirror.

    Done when: A date, an audience list or a public link.

  • Founders who have been through Demo Day advise sending requests the same night, before other companies fill investors’ calendars.

    Done when: A tracker with every follow-up, its time sent, the reply and the next step.

  • Ralston: once an investor says they are in, you are almost done, so get the signature and cash fast.

    Done when: Each yes has a signature date and a transfer date, or is marked “not yet a yes”.

  • YC founders use the investor database for this; outside YC, you ask founders directly.

    Done when: Two notes per investor, with a yes or no decision.

  • The weekly update is the habit YC wants to outlast the batch; the retrospective shows the whole curve.

    Done when: Sent to everyone on your update list, with the numbers filled in.

  • YC’s office hours and Bookface continue after the batch; your own version should too.

    Done when: A target number and three dates in your calendar.

Office hours · run it yourself

Questions a YC partner would ask you now

Answer each in one or two sentences, out loud first, then in writing. If an answer is vague, that is this week’s problem to fix.

  1. 01
    Why a partner asks this

    Graham’s “hear no till you hear yes” and Ralston’s advice to get the signature and cash as soon as possible.

  2. 02
    Why a partner asks this

    Investors follow each other, so the first commitment matters most; angels usually decide fastest.

  3. 03
    Why a partner asks this

    Graham says the first substantial offer can be half the difficulty; Blacksmith’s conversion jumped after theirs.

  4. 04
    Why a partner asks this

    YC partners describe founders checking investor reviews before taking meetings or money.

  5. 05
    Why a partner asks this

    Ralston’s rule: get fundraising over as soon as possible and get back to building your product and company.

  6. 06
    Why a partner asks this

    The batch ends but the weekly number doesn’t; Graham’s “Startup = Growth” measures progress week by week.

Weekly update · one number, week 1 vs 12, avg weekly growth

Write this week’s update

Week 12 retrospective: your number at week 1 and now, your average weekly growth rate ((week 12 ÷ week 1) to the power 1/11, minus 1; for example 20 → 60 users is about 10.5% a week), what worked, what didn’t, default-alive status, money committed, the next 12 weeks’ target and one ask.

Your update, ready to send
Our company: week 12 update

Our number: ?
This week's focus: one number, week 1 vs 12, avg weekly growth
What we did: -
What we learned: -
Biggest obstacle: -
Ask: -

Your number also goes into the growth tracker on the program page. Saved on this device.

Pitch builder · target 60 seconds

Build and time your pitch

Fill in each part. The builder joins them in order and estimates how long it takes to say.

0 words · about 0s spokenTarget 60s

Estimated at 150 words a minute. YC’s current pages do not state a pitch length. YC’s Summer 2022 Demo Day post said every company had one minute, and press and investor accounts of the Winter 2024, Spring 2025, Summer 2025 and Winter 2026 Demo Days describe one-minute pitches, usually with one slide.

Your script

Fill in the parts on the left; your script appears here in order.

Source: Michael Seibel, YC S22 Virtual Demo Day (Y Combinator blog, 2022)

Checkpoint before week 12

You have pitched to a real audience or in public, followed up with every interested person within a day, have a written next step or close date for each, and have sent a 12-week retrospective. That is the rhythm YC’s about page describes: Demo Day, then weeks of follow-up, then back to the product with support that continues.

See your 12 weeks in the growth tracker →

Questions about week 12

What happens at YC Demo Day?

The batch presents in San Francisco to an invite-only audience of investors and media: about 1,500 according to YC’s Demo Day page, about 1,000 according to its FAQ. The Fall 2026 Demo Day is on December 2. Recent accounts describe about one minute and one slide per company. Investors who can’t attend use the Demo Day website.

What happens after YC Demo Day?

Weeks of investor meetings and closing. YC says partners stay in close touch, help read investor replies and sometimes call investors. Office hours, Bookface and the alumni network continue after the batch.

How fast do YC companies close their round?

It varies and YC does not publish the numbers. Confident AI (W25) closed in five days before Demo Day; Proof (S19) held about 130 pitch meetings over a little more than a month.

Sources for week 12