A decision made over and over, not once
Every subsequent round a portfolio company raises forces the same decision: exercise pro-rata rights (Lesson 18) and put in more money, or let the stake dilute. This isn't a one-time choice made at the initial check, it recurs at every round for years, which is exactly why Lesson 22's reserves exist, to fund a decision that hasn't been made yet.
Reading the signal in each round
| Signal | Leans toward |
|---|---|
| Metrics from Lessons 9-10 (retention, MoM growth) are accelerating | Follow on, likely at a premium price |
| Metrics have plateaued or slipped since the last round | Pass, or follow on cautiously at a smaller check |
| A strong new lead investor is pricing the round confidently | Follow on; an external price validates the thesis independently |
| No new outside investor wants to lead the round | Serious caution; see the signaling risk in Lesson 29 |
Doubling down vs. spreading thin
Given the power law (Lesson 21), a common strategic error is treating every portfolio company's follow-on decision identically, reserving similar amounts for the clear early winner and the company that's merely surviving. A more disciplined approach concentrates reserves on the companies showing real outlier signal, and lets weaker performers dilute rather than propping them up out of loyalty or sunk-cost thinking.
The hardest follow-on decision isn't the obvious winner or the obvious failure, it's the company in between, showing mixed signals, where the reserve dollar could go either to a modest save or a genuine double-down.
Not investing is itself a decision with a cost
Passing on a follow-on round doesn't just avoid a risk, it also signals something to the market, and it forfeits the fund's ability to defend ownership if the company does go on to become the outlier. Lesson 29 covers exactly how visible, and consequential, that signal can be to everyone else evaluating the same company.
Checkpoint
- Follow-on decisions recur at every round, not just once, and reserves exist to fund them.
- Accelerating metrics and a strong new external lead both support following on.
- Concentrate reserves on real outlier signal rather than spreading them evenly across the whole portfolio.
If anything here still feels unclear, ask before moving to Lesson 24.