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Venture firms are combining two financing tools to keep pace with unusually large, fast-moving AI rounds: optional LP co-investment pools or special-purpose vehicles (SPVs), plus short- to medium-term warehouse loans. The pool or SPV brings additional limited-partner money into a specific deal, while a warehouse facility can provide temporary cash before that capital is available. Together, the structures let a general partner write a larger check without immediately resizing its main fund, but they also add concentration, debt and allocation risks.
How are VC firms funding huge AI rounds?
The immediate answer is a two-part toolkit. First, a firm invites selected limited partners (LPs) to invest alongside its flagship fund in a dedicated co-investment pool or SPV. Second, it may draw a warehouse loan so the investment can close before LP money has been called, transferred or finalized.
This matters because round sizes and closing schedules have moved beyond the assumptions of many ordinary venture funds. More than 87% of venture dollars invested in the first half of 2026 went to financings above $100 million, according to PitchBook figures reported by The Information. The approach is not a universal industry standard: the reported transactions involve particular managers, investors and legal documents.
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What is LP co-investing?
LP co-investing lets investors in a venture firm’s fund opt into selected deals outside the fund’s normal position. A pool or SPV is formed beside the main fund, and participating LPs receive direct exposure to the named company rather than only the diversified exposure of the flagship vehicle.
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Why firms create a pool or SPV
- Larger check capacity: the GP can support a major financing without exceeding the main fund’s intended position limits.
- Different economics: reported co-investments often waive management fees or reduce carried interest, although terms vary by transaction.
- Optional participation: LPs can select only deals that meet their risk and concentration limits.
- Trade-off: a single company can represent a much larger share of an LP’s exposure than it would in a broad venture portfolio.
Reported examples from 2026 coverage
| Manager or investor | Reported structure and deal | Figure and timing |
|---|---|---|
| B Capital | A separate LP co-investment pool supported its investment in Reflection AI after the company’s proposed financing grew substantially. | $100 million investment; Reflection AI was pursuing a $2.5 billion raise in 2026. B Capital’s regular venture fund was $500 million, raised in July 2026, and the new check was twice its prior investment in the company. |
| Lightspeed Venture Partners | LPs joined more than one co-investment, including a reported Anthropic transaction. | More than $5 billion of co-investments over the five years covered by the 2026 report; the firm generally waived management fees and reduced carried interest on these deals. |
| Thrive Capital and CalPERS | Thrive used an SPV to let CalPERS invest in Stripe and has invited LPs into other large financings, including OpenAI-related rounds. | More than $744 million raised by the SPV for Stripe in 2023, according to the 2026 report. |
These examples show the range of documents and fee arrangements involved; they do not establish identical terms for every co-investment program.
What is a warehouse loan for a venture fund?
A warehouse loan is a revolving credit facility that a venture firm can draw for a limited period to fund an investment before the associated LP capital is available. The borrowing reduces the firm’s cash posted at closing and adds leverage to the transaction. If the investment performs well, leverage can increase the equity return; it also creates interest, repayment and refinancing obligations.
The structure is different from a capital-call credit line. A capital-call line is ordinarily used after LP commitments to a fund exist but before the called money reaches the fund. A warehouse loan can bridge the period before the LP financing for a particular investment has been secured or received. The 2026 coverage identified J.P. Morgan Chase as a bank working with venture firms on warehouse loans, but availability depends on the lender, borrower and legal structure.
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Why do AI rounds require this speed?
AI companies are closing financings on a materially faster timetable than many other startups. The Q1 2026 PitchBook-NVCA monitor said AI companies that closed rounds did so roughly half a year sooner than non-AI companies. Cooley global business chair Peter Werner described the pressure as the need to move “at lightning speed to capitalize on some of these opportunities.”
That timing can make an unfunded allocation unusable: a firm that cannot produce cash at closing may lose its place in the round. Werner also described megafunds as “constantly out there keeping checkwriters warm in advance of quickly raising a new fund.” Thrive Capital, General Catalyst and Andreessen Horowitz have reportedly raised funds less than two years after prior fundraises, compared with the two- to three-year cadence cited in the coverage.
How do the financing options compare?
Each tool solves a different constraint. Co-investment structures add equity from LPs, warehouse facilities add temporary debt, capital-call lines bridge already-committed fund money, and a new fund increases durable capacity.
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| Structure | Deployment speed | Who supplies cash? | Fees or carry | Leverage and repayment | Main constraint |
|---|---|---|---|---|---|
| LP co-investment pool | Fast once LPs opt in and documents are ready | Participating LPs alongside the GP | Often reduced or waived management fees and lower carry in reported examples | No borrowing inherent in the pool | Concentrated exposure and limited deal selection |
| SPV | Fast for a named transaction if the vehicle can be formed and funded | LPs or other investors in the vehicle | Deal-specific; not stated uniformly | No borrowing inherent in the vehicle | Transaction-specific administration and allocation |
| Warehouse loan | Immediate draw can bridge a closing | A lender advances revolving debt | Interest and financing costs; exact pricing not stated | Yes; principal, interest and refinancing exposure | Lender appetite, collateral and legal structure |
| Capital-call line | Quick after commitments are in place | Lender advances against committed LP capital | Interest and financing costs; terms vary | Yes; normally repaid from LP capital calls | Requires existing fund commitments |
| Rapid new fundraise | Slowest for a single closing, but expands future capacity | New LP commitments | New fund economics | Not inherently leveraged | Fundraising time, market demand and manager capacity |
What are the risks and limits?
Debt can magnify both outcomes
Borrowing means less equity cash is posted initially, so a successful investment can produce a higher return on the firm’s own capital. The same mechanism leaves the borrower responsible for repayment and interest if the asset underperforms, and a refinancing problem can force a sale or another capital raise. Those downside effects follow from the leverage described in the financing structure; the reported coverage did not identify a loss from a specific warehouse loan.
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An LP co-investment pool may put substantial money into one marquee AI company. That can be attractive when an LP has high conviction, but it does not provide the portfolio spread of a broad venture fund.
Access is uneven
Fast rounds favor managers and LPs that can respond immediately. Smaller firms may lack a warehouse lender, a ready SPV process or enough LP demand to match a large allocation.
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Legal structure matters
The coverage said some funds organized as registered investment advisers have more room to use short-term debt. The governing documents, regulatory status and lender terms determine what a specific fund can do; this is structural context, not legal advice.
What do the 2026 market figures show?
The scale of the financing challenge is visible in aggregate data. The PitchBook-NVCA Venture Monitor reported $515.8 billion of U.S. venture deal value through the third quarter of 2026, with AI representing 82.7% of that deal value. The same market is described as concentrated among established managers, so a record total does not mean every fund or non-AI company has equal access to capital.
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What should an LP or GP examine before using one?
- Confirm whether the vehicle is optional, how allocations are set and what happens if demand exceeds the available shares.
- Read the management-fee, carried-interest, expense and governance terms for the specific pool or SPV.
- For a warehouse facility, model interest, maturity, covenants, collateral and the repayment source if LP funding is delayed.
- Check whether the fund’s documents and regulatory status permit the intended borrowing and whether the lender can fund on the required closing timetable.
- Separate the appeal of a high-profile AI name from portfolio-level concentration and liquidity limits.
Frequently Asked Questions
Does an AI-heavy venture market mean most startups are AI companies?
No. The 82.7% figure is AI’s share of U.S. venture deal value through Q3 2026, not the share of funded companies or transactions. A small number of very large AI financings can dominate a value-based percentage.
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Can LPs be forced to join a co-investment deal?
The pools described in the coverage are opt-in arrangements, so an LP can generally decline a particular transaction. The practical choice still depends on the vehicle documents, allocation deadline and the LP’s own concentration limits.
Can a smaller venture firm simply order a warehouse facility?
No. A warehouse loan depends on a lender willing to provide the line, the fund’s legal and financial structure, and an investment that fits the lender’s risk terms. The reported work with one bank should not be read as universal availability.
Why might a GP use both an SPV and a warehouse loan?
They address different timing problems. The SPV gathers equity from participating investors for a specific deal, while the warehouse line can supply interim cash so the deal closes before that equity has arrived.
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