The following is a guest post from Sahin Boydas, a serial entrepreneur and angel investor. He has built and sold two companies (RemoteTeam and MovieLaLa) and invested in over 200 startups, including giants like OpenAI and Anthropic. This is the story of one of his biggest losses and the lesson that changed how he invests.
Everyone loves talking about their wins. The 100x returns, the unicorn exits. I’ve had a few of those, and they feel great. But the wins teach you less than the losses. The real education, the stuff that sticks with you, comes from the punches in the gut.
I’m talking about the time I lost $500,000. On one deal. It was a brutal, expensive, and deeply painful lesson in venture capital. And it all came down to one of the most misunderstood parts of the game: follow-on investing.
The Seductive Allure of the “Hot” Round
It started, as these things often do, with a company that was on fire. Let's call them "InnovateCo." I got into their seed round for $100,000. The founders were sharp, the product was slick, and they were hitting all their early metrics. For the first 18 months, everything was perfect. They were growing 20% month-over-month. Every update was better than the last.
Then the email landed. A top-tier, Sand Hill Road firm was leading their Series A. The valuation was jumping from $10 million to $50 million. And I had my pro-rata rights—the right to invest more money to maintain my ownership percentage.
This is the moment every seed investor dreams of. It’s the ultimate validation. The big dogs are coming in, and you got in early. The temptation is overwhelming. You start doing the mental math. If they’re raising at a $50M pre-money valuation, and I own 1%, my initial $100k is already worth $500k on paper. If I put in more, I can turn this into a real home run.
My pro-rata was another $400,000. I had the capital. All the signals were green. The fear of missing out (FOMO) was screaming in my ear. So I did it. I wired the money. I didn’t just protect my stake; I doubled down. My total investment was now $500,000.
For a few months, I felt like a genius. The company was getting press. They were hiring aggressively. They were the talk of the town.
Where It All Went Wrong
The cracks started to show about six months after the Series A closed. The growth, which had been so consistent, started to flatten. The new hires weren’t gelling. The founders, who had been so focused and scrappy, were now distracted by board meetings and managing a much larger team.
The product roadmap started to slip. The competition, which had seemed irrelevant, launched a new feature that stole their thunder. The narrative started to shift. The "hot" company was suddenly just another startup struggling to find its footing.
Another year went by. The company wasn’t dead, but it wasn’t thriving either. It was a zombie. They had enough money to keep the lights on, but the explosive growth was gone. The top-tier VC who led the Series A quietly wrote off their investment. The founders eventually did a small acqui-hire, and the investors, including me, got nothing. Zero.
That $500,000 vanished. It was the single biggest loss of my angel investing career.
The Brutal Lesson: Pro-Rata is an Option, Not an Obligation
Losing that money forced me to confront a hard truth. I had made a classic, rookie mistake. I had treated my pro-rata rights as an obligation, not an option. I let the validation of a big VC firm cloud my own judgment.
Here’s the lesson I learned, the one that cost me half a million dollars to understand:
You must re-underwrite the deal from scratch.
When a portfolio company is raising a new round, you cannot rely on your past conviction. You can’t just look at the new, higher valuation and the fancy new investors and assume it’s a good deal. You have to pretend you’ve never heard of the company before.
Ask yourself these questions, as if you were a brand new investor:
- Is this a company I would invest in today, at this valuation, with this team, in this market? Be brutally honest. Has the market changed? Has the team proven they can execute at the next level? Is the valuation justified by their current traction, not their past hype?
- What do I know that the new investors don’t? You’ve been on the inside. You’ve seen the warts. You know the real story behind the numbers. New investors are seeing the polished pitch deck. You have the ground truth. Does that truth make you more or less confident?
- Is this the best use of my capital right now? Every dollar you put into a follow-on round is a dollar you can’t put into a new seed-stage company. The opportunity cost is real. A follow-on investment might turn your 5x into a 10x. But a new seed investment could be your next 100x. You have to weigh that trade-off carefully.
In the case of InnovateCo, if I had been honest with myself, I would have seen the red flags. The growth was slowing before the Series A. The founders were good, but not yet great at scaling a team. The valuation was based on hype, not fundamentals. I knew all of this, but I ignored it. I let the momentum of the deal carry me away.
My New Framework for Follow-On Investing
After that loss, I created a simple framework for every follow-on decision. I don’t follow it blindly, but it’s my default setting. It keeps me disciplined.
- The Default is No. My starting position on every follow-on opportunity is to pass. This forces me to build a strong, evidence-based case for why I should invest more. It fights the natural tendency to want to keep supporting your companies.
- Look for Non-Linear Progress. I need to see more than just incremental growth. I want to see a step-change in the business. Did they land a massive customer that changes their trajectory? Did they unlock a new, highly-scalable acquisition channel? Is the product showing signs of a true moat?
- Talk to the Team. And Not Just the CEO. I get on the phone with the founders. I ask the hard questions. What’s not working? What are you worried about? I also try to talk to other employees if I can. The view from the trenches is often very different from the view from the corner office.
- Model the Dilution. I run the numbers. What happens to my ownership if I don’t invest? What does the exit need to be for me to make a meaningful return? Sometimes, even with dilution, the potential return from your initial investment is still fantastic. You don’t always need to pour in more money.
Losing $500,000 was one of the worst experiences of my life. But it was also one of the most valuable. It taught me that in venture capital, conviction is perishable. You have to re-earn it at every stage. And sometimes, the smartest move you can make is to walk away.
Don’t let FOMO drive your investment decisions. Let discipline and clear-eyed analysis be your guide. It’s a lesson that cost me a lot of money to learn. Hopefully, by sharing this story, it will cost you a lot less.
Frequently Asked Questions
How can I apply this thinking to my own situation?
Start by identifying the core principle behind the opinion, not the specific example. Then ask yourself: does this principle apply to my context? If yes, test it in a small, low-risk way before going all in.
How has this view evolved over time?
My thinking on most topics has changed significantly over the years. Early in my career, I held many conventional views that experience proved wrong. I try to update my beliefs when the evidence changes.
What experience informs this perspective?
This perspective comes from over a decade of building companies in Silicon Valley, two successful exits (RemoteTeam to Gusto, MovieLaLa to Gfycat), and investing in 200+ startups including Anthropic, OpenAI, and Scale AI. I write about what I've lived.