Financial Planning
Venture Portfolio Construction: Checks and Reserves
Fit initial checks, follow-on reserves and costs inside a venture fund’s capital envelope using original allocation scenarios.
What you will learn
- Calculate a constrained initial-check budget.
- Model alternative follow-on scenarios without spending reserves twice.
- Identify which assumptions change portfolio capacity.
A portfolio-construction plan must fit inside the capital a fund can actually invest. Count initial checks, follow-on capacity and fund costs separately, then test the arithmetic. There is no universal portfolio size or reserve percentage that makes every venture strategy work.
Define the capital available for investments
Commitments are not automatically all available for portfolio checks. Start with the fund’s own cost and commitment treatment. Separate initial investments from follow-on capacity; a reserve is a planning allocation, not necessarily cash sitting in a dedicated bank account.
Carta’s follow-on investment guide explains the role of reserving and deploying follow-on capital. Use the mechanism, not a provider’s historical deployment observations as a required benchmark.
Build an original constrained plan
Fictional Cedar Fund has $30 million in commitments and assumes $4 million of lifetime costs, leaving $26 million for investments. It plans 20 initial investments at $800,000 each. Initial checks use $16 million, leaving a maximum $10 million planning reserve for follow-ons. No recycling or borrowing is assumed.
Portfolio capital reconciliation
| Component | Calculation | Amount |
|---|---|---|
| Commitments | Starting assumed capital | $30M |
| Costs | Explicit planning assumption | ($4M) |
| Investable envelope | $30M − $4M | $26M |
| Initial checks | 20 × $0.8M | ($16M) |
| Follow-on capacity | $26M − $16M | $10M |
Compare reserve uses without calling one optimal
Two fictional ways to use the same $10M reserve
| Scenario | Follow-on assumption | Capital used | Unallocated reserve |
|---|---|---|---|
| A | 10 follow-ons × $1M | $10M | $0 |
| B | 5 follow-ons × $1.5M | $7.5M | $2.5M |
Scenario B has fewer larger follow-ons and some unallocated capacity. The table does not establish which companies deserve capital or whether either strategy is suitable. It shows the resources required if those decisions are made.
Reserves also need timing. An expected $2 million follow-on next quarter and a possible one three years away have different liquidity implications even if they use the same lifetime envelope.
Test the initial-check assumption
Increase each initial check to $1 million while retaining 20 investments. Initial capital becomes $20 million and follow-on capacity falls to $6 million. The old $10 million follow-on plan no longer fits. Reducing company count, changing check sizes or changing the capital envelope are explicit decisions, not spreadsheet formatting.
Ownership targets add another dependency: check size depends on entry valuation and investment terms. Later dilution and actual pro rata purchases change ownership. Use the existing pro rata ownership lesson for that separate calculation rather than assuming reserves preserve a stake automatically.
Copy the portfolio-constraint card
Capital construction brief
Fund commitments / scope / currency: [ ]
Fee and expense provision / treatment: [ ]
Investable capital / recycling or debt excluded or defined: [ ]
Initial count × check size by category: [ ]
Follow-on amount and timing scenarios: [ ]
Unallocated capacity / reason: [ ]
Ownership assumptions / actual terms needed: [ ]
Check: all allocations fit the envelope: [ ]
Assumption owner / next decision: [ ]Keep the strategy and conversation aligned
The useful output is an explainable strategy with visible constraints, not a claim that a certain company count guarantees performance. Keep the approved plan, LP questions and follow-through together with Finta for emerging managers. Use fund accounting and advisers for actual capital availability and investment authority.
About this lesson. By Finta Editorial Team. Sources reviewed November 14, 2026. All example amounts, entities and outcomes are fictional teaching inputs, not observed fund performance. General education, not legal, tax, accounting or investment advice. Use qualified advisers and the governing documents for an actual fund.