StepStone Closes $1.7 Billion Infrastructure Secondaries Fund and What It Tells Accredited Investors About Private Markets

On August 26, 2026, StepStone Group (Nasdaq: STEP) announced the final close of its StepStone Secondaries Infrastructure Fund (SSIF) at $1.7 billion in total capital commitments, making it the firm's first closed-end commingled fund dedicated exclusively to buying LP interests in infrastructure funds and backing GP-led secondary vehicles. The fund is already about 50% deployed across 26 deals, mostly in the middle market. That deployment pace tells you something important about where institutional capital is moving: infrastructure secondaries, a strategy that barely existed at scale a decade ago, is now one of the fastest-growing corners of private markets, with Jefferies projecting global transaction volume could hit $30 billion in 2026, up from roughly $20 billion in 2025. This piece explains what infrastructure secondaries actually are, why the timing argument holds up, how accredited investors can get exposure short of a $25 million LP commitment, and where the real risks sit.

What Infrastructure Secondaries Actually Are

When a pension fund commits capital to an infrastructure fund (say, a 12-year vehicle investing in toll roads, power grids, and water treatment plants), it becomes a limited partner (LP). The LP has no public market to sell that position if it needs liquidity or wants to rebalance. The secondary market exists to solve that problem.

In an LP-led secondary, the original investor sells its fund interest to a specialist buyer at a negotiated price, typically a discount to the fund's stated net asset value (NAV). The buyer inherits the existing portfolio of assets, any remaining capital call obligations, and the right to future distributions. The original LP gets cash now. The buyer gets a seasoned portfolio at a discount.

GP-led secondaries work differently. Here the general partner (the fund manager) initiates the transaction, usually to extend the holding period on an asset it wants to keep managing beyond the fund's original life. The GP creates a new vehicle, often called a continuation fund, and existing LPs face a choice: take cash out, or roll their interest alongside fresh capital from secondary buyers. The GP gets more time with its best asset. Incoming investors get exposure to a specific, already-identified asset rather than a blind pool.

Infrastructure adds a distinct flavor to both deal types. The underlying assets, including airports, fiber networks, gas pipelines, transmission lines, and data centers, tend to generate stable, inflation-linked cash flows backed by long-term contracts or regulated tariffs. Secondary buyers often get meaningful day-one yield from assets they understand well, without the blind-pool uncertainty of a primary fund commitment. As BlackRock's infrastructure secondaries team notes, pricing is often based on a historical reference-date valuation that may be stale at acquisition, meaning the effective discount buyers receive is frequently higher than the quoted "optical" discount at signing.

Why This Subclass Is Growing So Fast

Infrastructure secondaries went from a rounding error to a recognized asset class in roughly ten years. The first dedicated infrastructure secondary fund raised capital in 2010. By 2021, only a handful of dedicated vehicles existed. The Preqin "Secondaries in 2025" report forecasts infrastructure secondaries will lead all secondaries strategies in both IRR (14.42% projected for 2023 through 2029, roughly 3.5 percentage points ahead of infrastructure primaries over that window) and AUM growth (14.54% CAGR through 2029, ahead of private equity secondaries at 13.34%).

Three structural forces drive that growth. First, the primary infrastructure market ballooned over the past decade. More primary funds means more LP positions that eventually need liquidity. Second, holding periods in infrastructure average 10 to 15 years, and many pension funds face regulatory or liability-matching pressures that make a 12-year locked-up position uncomfortable. Third, the broader secondaries market has normalized as an institutional practice. The Jefferies Global Secondary Market Review (January 2025) reported total secondary market volume hit a record $162 billion in 2024, up 45% from $112 billion in 2023. LP-led volume reached $87 billion and GP-led volume hit $75 billion, up 68% year-over-year. Average LP pricing firmed to 89% of NAV in 2024, up from roughly 81% in 2022, which brought more sellers to market.

Infrastructure is still a small share of that total, but it is catching up fast. The penetration rate of infrastructure secondaries is far below where private equity secondaries were in the early 2000s, and that gap is the opportunity. Dedicated infrastructure secondary strategies are targeting up to $20 billion in new fundraising over the next year alone. Dedicated buyers who specialize in infrastructure can accept lower return targets than generalist secondaries funds, which means they can pay more for assets and draw more sellers to the table.

The Discount-to-NAV Math and Where It Gets Complicated

NAV in a private fund is not a live market price. It is a valuation produced by the fund's manager, typically quarterly, based on appraisals, comparable transaction multiples, or discounted cash flow models, and it might lag actual conditions by three to nine months. When a secondary buyer negotiates a price at 90 cents on the dollar of reported NAV, the effective discount may be wider if the underlying assets have appreciated since the last valuation date, and narrower if market conditions have deteriorated. BlackRock calls this the stale reference valuation effect: the optical discount is the starting point, not the whole story.

The table below shows the range of secondary deal mechanics accredited investors should understand when evaluating any vehicle deploying capital in this market.

Deal Type	Who Initiates	Typical Price vs. NAV	Key Risk	Key Benefit
LP-led secondary	LP (seller)	85–95% of NAV (can exceed par for trophy assets)	Stale NAV and unfunded calls	Immediate yield from known portfolio
GP-led continuation fund	GP (manager)	Negotiated, often at or near NAV	GP conflict of interest	Exposure to a specific high-conviction asset
Structured secondary (preferred equity)	GP or LP	Preferred return, often 10–12% coupon	Complex waterfall, limited equity upside	Priority distributions and downside cushion

How the SSIF Fits Into the Market

StepStone's $1.7 billion close is notable for a few reasons. The commingled fund itself raised $1.5 billion, hitting its hard cap. The remaining $200 million came through separately managed accounts from institutional investors who wanted customized exposure. That bifurcated structure is increasingly common among large-scale secondary managers, letting them serve both pooled-fund investors and institutions that want tailored mandates on the same deal flow.

StepStone Infrastructure and Real Assets deploys an average of $13 billion per year across primary funds, secondaries, and co-investments. That primary-fund footprint is a real informational advantage. Secondary underwriting depends heavily on knowledge of the underlying funds and GPs, and StepStone's team assembles that knowledge through its SPI data platform as it evaluates thousands of primary fund investments each year. When an LP approaches to sell a mid-market infrastructure fund interest, StepStone's team is often already familiar with that fund's assets and vintage-year performance. That edge matters most in the middle market, where fewer dedicated buyers compete on any given deal.

SSIF's 50% deployment across 26 deals as of August 2026 implies roughly two closed transactions per month in a market where global infrastructure secondaries volume reached only $20 billion total in 2025. That pace reflects a deliberate concentration in mid-market tickets. Latham and Watkins advised on fund formation, a standard choice for large-scale private fund structures with significant LP disclosure obligations.

How Accredited Investors Can Get Exposure

Direct LP commitments to a fund like SSIF require institutional relationships and minimum commitments typically starting at $5 million to $10 million. If you are an accredited investor (at least $1 million in net worth excluding your primary residence, or $200,000 in annual income) but not a qualified purchaser ($5 million in investable assets), your access to infrastructure secondaries is more limited but not zero.

The most accessible path today runs through interval funds registered under the Investment Company Act of 1940. These vehicles continuously issue new shares, invest in illiquid private market assets, and offer redemptions only at set intervals, typically quarterly, rather than daily. Minimum investments usually start around $25,000. As Cantor Asset Management's July 2025 interval fund guide notes, the structure has grown by nearly 40% year-over-year to over $80 billion in assets under management, partly because it lets managers access real assets and private credit strategies without the $5 million-plus minimums of traditional private funds.

A growing subset of interval funds includes infrastructure debt, infrastructure equity, and infrastructure secondaries exposure within their mandates. If you are evaluating one, check three things. First, the percentage of the portfolio actually allocated to infrastructure versus private credit or real estate. Second, the redemption terms during stressed markets, since managers can restrict redemptions if request volume exceeds the fund's liquidity buffer. Third, the overall fee load, which at some interval funds rivals traditional private fund structures and weighs significantly on net returns at a 10 to 12% gross return level.

For qualified purchasers who can commit $5 million or more, some large secondary fund managers offer co-investment access alongside their flagship funds, or separately managed account structures. Access typically requires an introduction through a placement agent, a registered investment advisor specializing in alternatives, or a private bank alternatives desk.

The Real Risks, Spelled Out

Illiquidity and unfunded capital calls. Buying an LP interest in an infrastructure fund means inheriting any unfunded capital call obligations remaining in that fund. If the fund has called 70% of its committed capital, you are still on the hook for the remaining 30%, potentially at a moment of market stress when you would prefer not to write a check. Buyers who underestimated unfunded obligations in 2022, when valuation pressures coincided with aggressive call schedules, found themselves stretched. Interval funds address this by limiting individual position sizes and maintaining liquidity buffers, but those buffers also constrain returns.

Valuation lag. The discount-to-NAV you buy at is calculated off a valuation that may be three to nine months old. If interest rates rise sharply between the fund's last valuation date and your purchase date, the "discount" you paid may not be a discount at all once values are remarked. Smoothed NAV reporting reduces short-term volatility in reported returns but creates real pricing uncertainty for secondary buyers at the time of transaction.

GP conflicts of interest in GP-led transactions. In a GP-led continuation fund, the manager sits on both sides of the transaction: it is the seller (rolling assets out of the old fund) and the manager of the new vehicle it will earn fees on afterward. Most institutional-grade GP-led transactions now include independent fairness opinions and LP advisory committee approvals. But those safeguards are process-based, not outcome-guaranteeing. The same GP often selects the fairness opinion provider, and LP advisory committees can be perfunctory when large investors have other relationships with the manager they want to protect. If you are evaluating a vehicle concentrating in GP-led infrastructure secondaries, read how the manager handles conflicts and whether independent pricing advisors are required by the fund documents.

What to Do With This Information

If you are an accredited investor with meaningful alternatives exposure already, infrastructure secondaries offer a credible source of diversification: lower correlation to public equities, inflation linkage through infrastructure's regulated or contracted revenue streams, and a structural entry mechanism that can generate yield from day one. Deal sophistication and pricing transparency in infrastructure secondaries has narrowed substantially compared to private equity secondaries over the past three years.

Audit your current private markets allocation. If you hold infrastructure through a primary fund, you already have indirect familiarity with the assets the secondary market will eventually price. If you hold private equity secondaries through a 40 Act interval fund, ask your advisor whether the manager has added an infrastructure sleeve. If you are a qualified purchaser building a new alternatives allocation, the StepStone announcement is a useful benchmark for where institutional capital is flowing.

Do not treat a discount-to-NAV entry as a guaranteed margin of safety. Verify the vintage of the NAV being discounted, understand the unfunded obligation you are assuming, and in any GP-led structure, read the conflict-of-interest disclosures before evaluating the return projections.

For related AIN coverage, see our analysis of how private equity secondaries pricing works and KKR's own $19.2 billion infrastructure fund close.

Frequently Asked Questions

What is the difference between an LP-led and a GP-led infrastructure secondary?

In an LP-led secondary, an existing fund investor sells its interest to a buyer at a negotiated discount to NAV in order to generate liquidity. In a GP-led secondary, the fund manager initiates the deal, usually by creating a continuation vehicle to retain a specific asset beyond the original fund's term, and existing LPs choose whether to take cash out or roll over alongside new capital from secondary buyers.

Can I invest in infrastructure secondaries without a $5 million minimum commitment?

Yes, through interval funds registered under the 1940 Act, which typically require minimums of $10,000 to $25,000 and offer quarterly liquidity windows. Pure infrastructure secondaries exposure at this ticket size is still limited, since most interval funds blend multiple real asset and private credit strategies within one portfolio.

Why did secondary market pricing improve so significantly in 2024?

The Jefferies Global Secondary Market Review (January 2025) reports average LP secondary pricing rose to 89% of NAV in 2024, up about 800 basis points from 2022 lows, driven by rising public markets, increased buyer competition, and LP portfolios skewing toward newer, higher-quality vintages. In infrastructure, the growing presence of dedicated sector buyers who price assets against direct infrastructure return benchmarks rather than buyout return targets has also compressed required discounts.

What are the biggest risks specific to GP-led infrastructure secondary transactions?

The core risk is the conflict of interest inherent in a structure where the GP sets the transfer price for assets it will continue to manage and earn fees on in the new vehicle. Independent fairness opinions and LP advisory committee votes provide some protection, but these are procedural safeguards rather than guarantees that the transfer price reflects fair market value on the transaction date.

Jeff Barnes, MBA has no personal position in any company, fund, or platform named in this article. Angel Investors Network has no current commercial relationship with any party mentioned. AIN provides marketing and education services, not investment advice. Past performance does not guarantee future results. All investments involve risk, including loss of principal.