---
title: "Follow-On Investment | Altss Glossary"
description: "A follow-on investment is additional capital invested into an existing portfolio company after the initial investment."
canonical: "https://altss.com/glossary/follow-on-investment"
---

Portfolio Management

# Follow-On Investment

Publisher: Altss LLCPublished 2026-01-01Content modified 2026-01-06

A follow-on investment is additional capital invested into an existing portfolio company after the initial investment.

**Allocator relevance:** **Affects portfolio construction, reserves planning, and concentration—often a major driver of venture outcomes.**

### Expanded Definition

Follow-ons are used to defend ownership, support growth, and concentrate capital into winners. In venture, follow-ons can be essential because outcomes are power-law distributed—allocating more to top performers can drive fund performance. However, follow-ons also increase concentration risk and can create overexposure if not governed properly.

Allocators evaluate follow-on discipline through reserve strategy, decision thresholds, and evidence that follow-ons are tied to underwriting rather than emotion or signaling.

### How It Works in Practice

Managers reserve capital (follow-on reserves) and deploy it across later rounds based on performance, traction, and pricing. Pro-rata rights and priced rounds influence how follow-ons are executed.

### Decision Authority and Governance

Governance defines when follow-ons are approved, how reserves are allocated across the portfolio, and what concentration limits apply. Weak governance leads to inconsistent reserve use and forced dilution or overconcentration.

### Common Misconceptions

- Follow-ons always mean the initial bet was right.

- Reserves should be deployed evenly across companies.

- Follow-ons reduce risk by “supporting” companies.

### Key Takeaways

- Follow-ons are strategic capital allocation decisions.

- Reserves discipline is a key venture performance driver.

- Concentration and pro-rata mechanics must be managed.

## Related terms

[Portfolio Construction](https://altss.com/glossary/portfolio-construction)[Concentration Risk](https://altss.com/glossary/concentration-risk)[Underwriting](https://altss.com/glossary/underwriting)

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