Follow-On Investment: How VCs Decide When to Double Down

A follow-on investment is additional capital a venture fund puts into a company it already backs, usually in a later round led by a new investor. Funds plan for it by holding back reserves, then decide case by case whether to take their pro rata allocation, invest more, or pass.

Definition: A follow-on investment is any investment a fund makes in an existing portfolio company after its initial check, whether through a priced round, a bridge, or a secondary purchase.

The first check gets the headlines. The second check often decides the fund.

Follow-on decisions concentrate a fund's capital in the companies that are working. And a pass can send a damaging signal about a company the fund knows better than almost anyone. So in our view they matter about as much as the initial picks.

Illustrative worked example: A $50M seed fund invests $1.5M for 12 percent of a company at a $12.5M post-money valuation. Eighteen months later the company raises a $10M Series A at a $40M post-money valuation. The fund's pro rata right lets it buy 12 percent of the new round, or $1.2M, to keep its stake at 12 percent. If it passes, the new shares dilute it to 9 percent (12 percent times $30M pre-money divided by $40M post-money). If it invests $1.2M, it has $2.7M in the company, which is 5.4 percent of the fund.

Why follow-on investments exist

Venture returns tend to be concentrated in a few companies per fund, and only top-performing funds clear strong return bars. Carta's Q1 2026 VC Fund Performance report, covering 2,775 funds, shows that for every vintage from 2017 through 2024 except 2021, the 90th percentile net IRR is above 20 percent, while the 75th percentile is no higher than 15.5 percent in any of those vintages.

One common way to move toward the top of that range: own more of the winners at exit than the first check alone would deliver.

A follow-on investment can do three things for a fund:

Maintain or increase ownership in the companies that are working.
Deploy capital with more information than a new seed check, because the fund has months of inside knowledge.
Support the company through a bridge or inside round when outside capital is slow.

The catch is price. A Series A or B share usually costs several times what the seed share cost, so a follow-on dollar tends to buy less upside than an initial dollar. That tension sits at the heart of the reserves debate.

How funds size reserves for follow-on investment

Reserves are the portion of a fund set aside for follow-on investments rather than initial checks. GoingVC's guide to follow-on strategy describes two common approaches:

Percentage of fund. Decide the reserve up front (GoingVC says VCs typically allocate between 40 and 60 percent of their funds for follow-on) and size initial checks to fit the rest.
What is left. Set the number of companies and the ownership target first, then reserve whatever remains; in GoingVC's example that leaves 40 percent for follow-on rounds.

Our read: a reserve earns its keep when it goes to the winners. Spread evenly across the portfolio, it more often drags the fund multiple down than lifts it. For scale, Sapphire Partners, which invests in venture funds, found in 2022 that most managers it sees cluster around a 1:1 ratio of initial checks to reserves.

Deployment pace helps frame the decision. Carta's follow-on guide notes that venture funds from pre-2022 vintages typically deployed 47 to 60 percent of their capital in the first two years. Carta's Q1 2026 data shows the 2025 vintage had already invested about 35 percent of its capital, and funds closed in Q1 2026 had already deployed about 28 percent of committed capital.

Reserve by graduation rate: an illustrative example

GoingVC's framework sizes reserves from graduation rates (the share of companies that raise the next round), dilution, and how much the fund wants to take in each round. Carta's Peter Walker offers seed VCs a benchmark for Series A graduation after three years: 20 percent is low, 35 percent is medium, and 45 percent is high.

Take a hypothetical seed fund that writes 25 first checks of $1M and plans a $1M follow-on in each company that raises a Series A:

Graduation to Series A after 3 years	Companies raising	Series A reserves needed	Reserves per $1 of first checks
Low (20%)	5	$5M	0.20
Medium (35%)	about 9 (8.75)	$8.75M	0.35
High (45%)	about 11 (11.25)	$11.25M	0.45

Even at a high graduation rate, a Series A pro rata budget alone uses far less than a 1:1 reserve in this example. The rest of a 1:1 plan would pay for Series B and later rounds, bridges, and larger checks into the few breakout companies.

If your plan doesn't name those uses, the reserve may be bigger than it needs to be.

The case for smaller reserves

For a small early-stage fund, we think the case for thin reserves has become strong, though plenty of managers disagree. Follow-on rounds often come weeks or months after the first check with little new information. Crowded cap tables leave small funds ignored in the next round. And multistage firms with very large funds turn pricing into something closer to an auction.

Homebrew co-founder Hunter Walk made a sharp version of this argument in July 2026: in his view, funds of $100M or less should hold almost no reserves. Market concentration is consistent with it. The Q2 2026 PitchBook-NVCA Venture Monitor reports that three firms took in 48.1 percent of all venture capital raised in H1 2026, and that megadeals of $100M or more captured 87.5 percent of the $412.7 billion deployed.

"Without reserves, you abandon your best companies"

This is the strongest objection, and it deserves a fair hearing.

A fund without reserves struggles to support a company through a bridge. It also hands its best companies to later investors at exactly the point where risk has dropped most. The seed fund took the scary early risk; someone else collects the safer upside.

But Walk's answer is to judge each pro rata opportunity against new deals, and to use SPVs where conviction runs ahead of the price. That keeps the option to support a winner without locking up capital for companies that won't need it.

Where we land: reasonable managers end up in different places, and both thin and heavy reserves can work. The approach we'd be most wary of is not deciding up front. Portfolio size and reserves are choices to make on purpose, which is also the heart of our take on portfolio size.

Pro rata, super pro rata, and what a fund is actually entitled to

Pro rata rights are the contractual basis for most follow-on investments. Carta defines them as a contractual right for an investor to participate in a later round to maintain its ownership percentage, and stresses that pro rata is a right, not an obligation. Three practical points:

The right is only as good as the documents. Pro rata rights in a SAFE side letter or the investors' rights agreement often apply only to "major investors" above a threshold, and a new lead may ask small holders to waive or cut back their allocation.
Super pro rata means investing more than your entitlement, which requires the company and the new lead to make room in the round. The answer usually depends on how competitive the round is.
Passing has a cost. Skipping your pro rata can be read as a signal, and outsiders may see it as doubt about the company. New investors often ask why the insider with the most information chose not to invest. GoingVC's guide flags the same signaling risk.

How to make a follow-on investment decision

Carta's follow-on guide lays out the core analysis: re-evaluate the investment thesis, run an updated and defensible valuation, look for red flags, structure protective terms, and analyze the impact on the fund. Here's one process worth considering:

Re-underwrite from scratch. Would you invest in this company today, at this price, if you had never met it? If the answer is no, already owning some is not a good reason to buy more.
Check progress against the plan you funded. Revenue, retention, burn, and team versus what the initial memo assumed. Missed milestones with a good explanation are different from missed milestones with a new story each quarter.
Look at who is leading. A strong outside lead pricing the round is a form of validation and reduces the information burden. An inside-led round or a bridge round with no outside price means the fund is setting the price itself. That usually calls for more diligence, not less.
Model the fund, not the deal. What ownership do you hold after the round with and without the follow-on? What would this company have to be worth at exit to return the fund? Does another $1.2M here beat a new seed check?
Decide on structure. In a priced round with a lead, structure is mostly set. In a bridge, the fund chooses between a convertible note, a SAFE, or priced preferred, and whether to ask for protective terms such as pay-to-play; the down round guide covers the mechanics when the price has fallen.
Document the decision either way. A record of why you passed can matter when an LP asks about the company that later succeeded.

Portfolio-level habits that keep follow-ons disciplined

Cap concentration. Many funds set a maximum share of the fund any single company can absorb, including follow-ons. Check what your fund documents allow.
Tier the portfolio. One option is a quarterly venture capital portfolio review to sort companies into "lean in," "hold," and "no more capital," with reserves pre-committed to the first group.
Reserve by graduation rate. We prefer sizing reserves from expected graduation rates and planned participation, as in the table above, rather than an arbitrary percentage.
Use recycling. Early exit proceeds can be reinvested within limits set by the fund documents (The Fund CFO newsletter says recycling is typically capped at 20 to 25 percent of commitments). Homebrew, by Walk's account, got to more than 120 percent invested in each of its first two funds.
Report clearly to LPs. Follow-on cost basis, ownership, and the mark from the new round are worth including in every quarterly letter. The broader framework sits in the venture capital portfolio strategy guide.

Where new investors go wrong with follow-on decisions

Many follow-on mistakes are emotional rather than analytical: doubling down on a struggling company because of sunk cost, passing on a winner because the price "feels high" next to the seed price, and letting a founder relationship stand in for a re-underwrite.

Angels may feel all three more than funds do, because they lack a partnership to argue with.

1752vc's Emerging Angels program gives accredited investors who are new to angel investing that partnership: eight live weeks with a seat at the table in a working fund's investment process, including live diligence calls, deal reviews, monthly Investment Circles, and a private community.

The bottom line

A follow-on check isn't loyalty. It's a new investment at a new price, and it deserves the same scrutiny as the first one, maybe more.

Decide your reserve policy before the fund needs it, spend it on the companies that earn it, and write down why when you pass.

Sunk cost asks how much you already own. A good follow-on asks what you'd pay today.

Key takeaways

A follow-on investment is additional capital into an existing portfolio company, planned through reserves and usually executed through pro rata rights.
GoingVC puts typical reserves at 40 to 60 percent of a fund, and Sapphire Partners (2022) saw most managers near a 1:1 initial-to-reserves ratio.
A growing argument, voiced by Hunter Walk among others, holds that funds of $100M or less should hold almost no reserves as later rounds get more competitive.
Sizing reserves from graduation rates is one sound approach: Carta's benchmark calls 35 percent Series A graduation after three years a medium result.
We think each follow-on is worth re-underwriting as a new investment, modeling at the fund level, and documenting, because a pass can send a signal.

Frequently asked questions

What is a follow-on investment in venture capital?

A follow-on investment is money a venture fund invests in a company it already backs, after the initial check, usually in a later funding round led by someone else. Funds hold back reserves for this purpose and typically use their pro rata rights to take part and keep their ownership from being diluted.

How much do VC funds reserve for follow-on investments?

It varies by stage and strategy. GoingVC says VCs typically allocate 40 to 60 percent of their funds for follow-on, and Sapphire Partners wrote in 2022 that most managers it sees cluster around a 1:1 ratio of initial checks to reserves. Some small-fund managers now argue for far lower reserves.

What is a reserve ratio in venture capital?

A reserve ratio compares the capital a fund sets aside for follow-on rounds with the capital it plans to use for first checks. A 1:1 ratio means a dollar of reserves for every dollar of initial investment, or roughly half the investable fund. In our view the ratio works best when it follows from expected graduation rates and planned participation.

Why do VCs make follow-on investments?

VCs follow on to keep or grow ownership in the companies that are working, to deploy capital with more information than a new investment offers, and to support companies through bridges when outside capital is slow. Because most fund returns tend to come from a few companies, owning more of them at exit can matter a great deal.

What happens if a VC does not follow on?

The fund's ownership is diluted by the new round, and new investors may read the pass as a negative signal about the company, since the existing investor has the most information. It usually helps to document the reasons and, where the pass reflects fund strategy rather than the company, say so to the new lead.

Sources

Disclaimer: This guide is for general education only and is not legal, tax or investment advice. Laws, market data and program terms change, so it may not reflect the latest developments or fit your situation. Treat it as a starting point, not a source of truth, and talk to a qualified lawyer, accountant or financial adviser before you make decisions.