The Angel Investor Portfolio Delusion
Mash Bonigala There’s a popular piece of advice circulating in angel investor circles: diversify aggressively. Write small cheques. Build a portfolio of 30, 40, 50 companies. Let the power law do the work.
It sounds smart. It is, in most cases, a waste of everyone’s time.
The math isn’t the problem
Yes, venture returns follow a power law. Yes, a single winner can return an entire fund. The math is real. But the conclusion most angels draw from it is backwards.
They hear “one deal will matter more than all the others” and decide the answer is to buy more lottery tickets. What they should hear is “your ability to pick the right one is the only thing that matters.”
Diversification in public markets works because you’re admitting you can’t predict which stock will outperform. That’s honest and correct for most people investing in liquid assets. But angel investing isn’t passive index investing dressed up with pitch decks. You’re making a small number of high-conviction bets on people you’ve met, products you’ve used, and markets you understand.
If you’re not doing that, you shouldn’t be angel investing at all.
What overdiversification actually signals
When someone tells me they have 40 angel investments, I don’t think “sophisticated portfolio.” I think:
- They wrote cheques too small to matter to the founder
- They didn’t have conviction on any individual bet
- They can’t meaningfully help any of those companies
- They optimised for deal flow volume instead of deal quality
A $5K cheque in a $2M seed round buys you 0.25% of the company. Even if that company returns 100x, you’ve made $500K. Solid, but you wrote 39 other cheques that went to zero to get there. Your net return looks a lot less impressive than the story you tell at dinner parties.
The founders notice
Here’s what the portfolio-spray angels miss entirely: founders talk. And they know the difference between an investor who chose them with conviction and one who’s collecting logos.
The best founders, the ones building the companies you actually want to be in, are increasingly selective about their cap tables. They want angels who bring signal. A $25K cheque from someone who spent real time understanding the business, who will answer a Sunday night text about a hiring decision, who has operational experience in the space. That’s worth ten times more than five $5K cheques from people who read a one-pager and wired money the same week.
When you spray and pray, you end up in the companies that couldn’t attract higher-conviction capital. That’s not a portfolio. It’s adverse selection with extra steps.
The uncomfortable truth
Concentrated angel investing is harder. It requires you to do real diligence, have genuine expertise in the space, and accept that you might be wrong about your three or four bets. It requires ego-bruising honesty about what you actually know versus what you’ve skimmed in a newsletter.
Diversification lets you skip all of that. You get to call yourself an angel investor, attend the right events, and never have to face the question of whether you can actually pick.
Most angels can’t. That’s fine. But pretending diversification is a strategy, rather than an admission, is how you end up with a portfolio of 50 companies, no meaningful returns, and a calendar full of founder update emails you stopped reading eighteen months ago.
The better approach
Write fewer cheques. Make them bigger. Only invest in spaces where you have a genuine, unfair understanding of the problem. Be useful enough that founders actively want you on the cap table.
Three investments you deeply understand will outperform fifty you skimmed. Not because the math guarantees it, but because conviction compounds in ways that diversification never can.