What Happens to Your Angel Investment When a Startup Raises a Series A?
Originally sent to Play Money subscribers · March 2025
Part of our ongoing series explaining what actually happens after you click “invest.”
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When a startup raises a Series A, convertible notes convert into equity, and SPVs sign legal documents on behalf of investors.
And when this happens, it feels like a milestone.
But most angel investors don’t actually know what happens behind the scenes.
Who signs the documents?
How do convertible notes convert?
How do you calculate your markup?
And why does visibility suddenly get murkier?
Let’s break it down.
Who Signs the Series A Documents in an SPV?
When a company raises a Series A, there are often multiple legal documents that need to be reviewed and signed.
Now imagine 100 individual angels each needing to:
- Review six dense legal agreements
- Understand ROFR provisions
- Sign on time so the round can close
It would be chaos.
This is exactly why SPVs exist.
SPV Advisors Sign on Behalf of Investors
In a properly structured SPV:
- The SPV advisor handles review and signing
- Decisions are made at the SPV level
- Founders get efficiency
- Investors get representation
It keeps the process smooth without sacrificing oversight.
As a founder, I once had a minority shareholder stall an acquisition because she wanted to “read and understand every document” — while on vacation.
That experience alone made me deeply appreciate the efficiency of SPVs.
What Happens When a Convertible Note Converts?
Convertible note conversions are one of the rare moments when angels get a clear snapshot of their paper gains.
Why?
Because conversion documents typically include:
- Total shares issued to the SPV
- The conversion price
- The new round’s share price
If the SPV invested via a convertible note:
- Accrued interest converts into additional shares
- That interest will show up on your K1
- Your effective ownership increases
This is one of the few clean mathematical moments in early-stage investing.
You can actually “math it backwards.”
Why Calculating Paper Gains Gets Harder After Series A
After conversion, visibility decreases.
Unless you:
- Have direct information rights
- Invest in the next round
- Are a major investor
You likely won’t have access to all the details needed to calculate a precise markup.
Why?
Because:
- Post-money valuation alone doesn’t reveal ownership without outstanding share counts
- Share price doesn’t reveal liquidation preferences
- You rarely see the full preference stack
Private markets are not built for continuous mark-to-market transparency.
And importantly:
You can’t reinvest markup.
You can’t control outcomes.
So while it’s intellectually satisfying to calculate paper gains, it shouldn’t change your long-term portfolio behavior.
The Bigger Picture for Angel Investors
A Series A raise is exciting.
But what matters most is:
- The company now has fresh capital
- The founder has more runway
- The business has crossed a meaningful de-risking milestone
Angel investing is a long game.
Conversions are milestones.
They are not liquidity events.
Understanding the mechanics helps you stay calm and rational through the process.
And that’s an edge.
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