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    Y Combinator Demo Day: Lessons For Angel Investors

    administraciónBy administraciónJune 19, 2026No Comments12 Mins Read
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    Part of the reason I’ve been writing about distribution and the importance of eventually betting on yourself was to gear myself up for Y Combinator Demo Day. For those unfamiliar, YC is the largest and arguably the best startup accelerator in the world. And it happens to be based in my backyard in San Francisco.

    I’ve been a startup investor since 2002, a venture capital LP since 2006, and a private company operator since 2009 with Financial Samurai. I’ve loved startups and the entrepreneurial life ever since spending my middle school years in Kuala Lumpur, Malaysia. The families with large homes in the hills, the ones with the views and swimming pools, were all entrepreneurs.

    As an impressionable 12-to-14-year-old boy, I figured getting picked up in a black Mercedes 280 SEL with a chauffeur looked like a lot more fun than taking the bus. So it stuck with me early that entrepreneurship was the path to a potentially better life.

    Unfortunately, I chickened out after college. In 1999, a family friend offered me a job in Shenzhen, China to run his eyeglass parts factory and potentially partner with him to build his business in a new country. I think he felt like I was the son he never had, as his daughter wasn’t interested. Instead, I took the “safer” route and joined Goldman Sachs as a financial analyst in the international equities department. After 7 rounds and 55 interviews, it was too tough to turn down.

    But ever since 1999, I’ve carried a lot of what-ifs about the adventure I didn’t take. So when the world finally crashed in 2009, I figured it was now or never to start my own thing with the launch of Financial Samurai. YC Demo Day was, in a way, reliving a door I closed 26 years ago.

    Why Y Combinator Is Worth Showing Up For

    Before I get into the day, let me explain why YC is a big deal.

    YC is the most selective startup accelerator in the world. The acceptance rate is roughly 1%, which makes Harvard look easy to get into by comparison. Get in, and you receive $500,000 for about 7% of your company, three months of intense mentorship, and a network that opens doors most founders spend a decade trying to pry open.

    Does the program actually work? The numbers say yes. About 4.5% of YC companies go on to become billion-dollar unicorns, versus 2.5% for other venture-backed seed-stage startups. Roughly 45% raise a Series A, compared to 33% for everyone else. To date, YC has funded more than 90, billion-dollar companies.

    You also might have heard of a few of them. Airbnb. Coinbase. DoorDash. Instacart. Stripe. Reddit. Dropbox. YC is great at finding outliers early and pouring rocket fuel on them. It is also a fabulous business model.

    So when better odds at a unicorn are on the table, you show up. Even if it means standing on your feet for eight hours straight, which I happily did from 9:45 in the morning until 5:45.

    Y Combinator And Serendipity

    I talk about luck and serendipity a lot on Financial Samurai. I firmly believe most outsized wealth is due to luck. And my path to attending YC Demo Day is a great example.

    Back in 2013, I played tennis with the co-founder of a roboadvisor called FutureAdvisor. His co-founder, Jon, happened to be a dad at my kids’ school in the same grade. Jon went on to become a full partner at Y Combinator in 2023.

    Many founders get stuck trying to find the perfect startup idea before they commit. But the perfect idea doesn’t exist in the abstract. The only way to find what works is to pick one, go deep, and get feedback from real customers.

    In this episode of Startup School, YC’s @xuster… pic.twitter.com/ID5DanKlrv

    — Y Combinator (@ycombinator) June 17, 2026

    Then it turned out one of the dads in my Pokemon Go group chat was a YC alum. For years we traded raid strategies and never once talked about work. Then his company, LanceDB, raised a Series A, and I thought to myself, why didn’t I support and invest? It’s simply because I had no idea what he did. Please ask people what they do, they might surprise you.

    And then my softball buddy, who I also play poker with, mentioned his co-founder at AppThority was a dad at my school. That’s how I got to know Domingo, whose kid is in the same grade as the son of Garry Tan, the President and CEO of Y Combinator. I first met Domingo at a first-grade dad event a couple of years ago, and he introduced me to the various types of tequila.

    So with my love of entrepreneurship, my conviction that we’re heading into an AI-driven future, and YC parents seemingly all around my school, I finally had to attend Demo Day. Thanks to Domingo, Garry, and the YC staff for having me.

    Fantastic Energy And Creativity

    Fantastic Energy And Creativity

    The main takeaway is that YC Demo Day is a blast of adrenaline that makes you want to run through walls. You don’t just want to build products that solve incredible problems. You start questioning your entire purpose.

    One founder I met was Marshall Gould, a researcher in genomic medicine from Oxford. He’s building Juno, an AI health assistant for chronic illness. His company spoke to me immediately, because I suffered from chronic back pain for three years while in banking. If I’d had an AI health assistant to help me get through those days, I would have paid almost anything to feel better, or at least not feel alone.

    Over 1 billion people live with conditions like fibromyalgia, long COVID, POTS, ME/CFS, EDS, endometriosis, lupus, and MS. More than 15% of the world lives with some form of disability. And the hard truth is that as we age, most of us will face some illness that chips away at our quality of life. This is a market measured in human suffering, and almost nobody is building specifically for it.

    I’ve invited Marshall onto the Financial Samurai podcast so more of you can hear his story directly. It feels great to help founders do great things for humanity.

    Juno AI - AI Health Assistant AI, Founders Isaac Tolley and Marshall Gould
    Juno founders Isaac Tolley and Marshall Gould. Isaac waited 14 years for an eosinophilic bronchitis diagnosis. Marshall lives with ME/CFS and is still searching for something that helps. They spent the last year conducting research at Oxford and UCL to understand what makes people engage with medical chatbots, to allow Juno to ask the right questions at the right time and comprehensively understand each user’s health.

    The Competition To Invest Is Tough

    By the time Demo Day arrives, the companies with the most traction have already filled their rounds. So if you want a real shot at investing, you need to reach out to founders one to three weeks before. And if you aren’t a recognizable angel or a VC from a known institution, getting in can be tough.

    That said, there are still plenty of amazing companies open to new investors on Demo Day. And as every founder and investor knows, the first product is rarely the final product. Companies pivot and iterate constantly.

    My favorite pivot is Slack. It started as an internal communication tool for a failed massively multiplayer online game called Glitch. The game shut down, the team rebranded the tool, and Slack launched in 2013. In 2021, it sold to Salesforce for $27.7 billion. Not bad for a side feature of a video game nobody played.

    The biggest investment winners are almost always non-consensus. So just because you couldn’t get into the YC company that grew to $1 million in annual recurring revenue within six months doesn’t mean you’ve missed out. The next Airbnb rarely looks like the next Airbnb on day one.

    YC Demo Day with CAIS dads, including Brady, Jeff, Sam Dogen, Garry Tan, Domingo Guerra
    My fellow school dads showing up to YC Demo Day to support great founders. Thanks for having us, Garry.

    What Angel Investors Should Bring To The Table

    As an angel, if you aren’t writing the biggest check, or aren’t a celebrity, you’d better add the most value. The founders worth backing are the ones you can genuinely help. Here’s what every angel should think hard about bringing to the table before showing up:

    • Distribution. Access to a real audience of potential customers, the single hardest thing for an early-stage company to build from scratch.
    • Introductions to customers who fit the founder’s target profile.
    • Help finding the right early employees to round out a team.
    • Introductions to other investors for the next round.
    • Operating expertise across product, marketing, and expansion, ideally earned the hard way by actually running a business.

    My edge is distribution. Financial Samurai reaches hundreds of thousands of financially sophisticated readers every month, exactly the audience many fintech and consumer founders want. Add 20 years of venture LP relationships and 17 years running a profitable business, and I can help with intros, the next round, and the operating grind.

    Be Proactive And Take Initiative

    From an investor’s standpoint, there are about 200 founders in each batch to track. So you have to do your homework beforehand and narrow the field to what’s most relevant. Out of your shortlist, you might invest in just 10%, so you need to talk to as many founders as possible. Build your funnel.

    I had five names on my list out of 196, focused on personal finance, fintech, and consumer companies where I knew I could add value. I had two great conversations and reached out to the other three. They didn’t respond, likely because their rounds were already full, which is the norm for the hottest companies by Demo Day. No hard feelings. I believe in serendipity. If it’s meant to be, it’s meant to be.

    A quick note on etiquette, because I’ve had differing opinions on how to approach founders. In the first meeting, I’m not a fan of interrogating a founder on their ARR, margins, cap structure, and burn rate. Instead, I want to build rapport first, listen to their story, and then follow up with the harder diligence questions afterward, when you have their attention and a real back-and-forth going. Relationships open doors that spreadsheets can’t. But I understand the importance of getting to the point since there are so many decisions to be made.

    Then there are the founders working the room for capital. Because I had a purple investor lanyard, founders knew to approach me and my companions during breaks, lunch, and happy hour if they were still closing their round.

    I admired every one of the roughly 15 or so founders who came up to share their story. I made a point to listen, offer encouragement, and be helpful. It takes real courage to walk up to a stranger and ask for something. Because if you never ask, you never get. It reminded me of my dating years. If your success rate is only 5%, you’d better ask 20 times to get one yes.

    YC Demo Day pitch

    A Very Small World With Plenty To Eat And Drink

    Demo Day also had endless free food and drinks, which most conferences do not. I appreciated the spread inside, plus all the food trucks and vendors outside. Hard to be in a bad mood with a taco and a beverage in hand.

    Funny enough, I spotted the three GPs of another seed-stage fund I’m an LP in. They were doing their own diligence, trying to read the trends. Maybe they were even there to out-compete me on a deal. Who knows.

    The key point is that the venture and startup world is small. If you want opportunities to invest, you have to be genuinely nice. Work on that emotional intelligence. The last thing you want is to get blackballed because you were rude to a founder, showed up 40 minutes late without an apology, or backed out of a handshake deal.

    Be nice. Then be helpful. The more you help others, the more people want to help you.

    Open To Invest

    My final takeaway is that being a venture investor is hard. We already know how hard it is to be a founder who gets a company off the ground. A lot of folks like to poke fun at venture capitalists, thinking they have cushy lives, don’t have to work too hard, and are all rich off their 2%+ management fees and 20% to 30% carry. But for most VCs not in the top tier, the job is an extensive grind.

    The diligence required before you invest is a full-time job. For example, roughly 200 YC companies present per batch, and there are four batches a year. No single person can properly analyze all of them, so you have to niche down and accept that you’ll miss plenty.

    And even when you get the meeting and decide to invest, most startups won’t return your capital, let alone generate life-changing wealth for you and your LPs. You build your portfolio deliberately, ideally 20 to 60 companies, help where you can, and wait 8 to 11 years to see results.

    I hope to return to many more Demo Days and invest in more companies. I’ve set aside $150,000 a year for angel investing. Let’s see what happens.

    And if you’re a founder, YC or otherwise, raising capital and you think I can help, please reach out. My email is at the bottom of my About page, or you can leave a comment below.

    Build on!

    Are any readers investors in YC companies or YC founders? I’d love to hear about your experience. What percentage of your capital or how much are you allocating to investing in startups? Have you had any great successes?

    Want to build financial freedom sooner, rather than later? Join 60,000+ readers and get my free weekly newsletter every Sunday morning. No fluff, no spam, just the same first-person insights on personal finance, real estate, startups, and financial independence I’ve been sharing since 2009. Everything I write comes from real experience, not theory.

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