Every so often, a fund structure comes along that doesn’t fit neatly into the categories most people learned in a personal finance class. Interval funds and their close relative, tender offer funds, are two of those structures. They look like mutual funds in some ways, trade nothing like ETFs, and hold assets that would make a typical fund manager nervous. Understanding how they’re built explains almost everything about why they behave the way they do.
Quick Answer
An interval fund is a registered closed-end fund that sells shares continuously like a mutual fund but only lets investors cash out during scheduled “repurchase offers,” usually every three, six, or twelve months, and only for a fixed slice of the fund (typically 5% to 25% of shares outstanding). That structure lets the fund hold illiquid assets, such as private credit, non-traded real estate, or private equity stakes, without needing to sell them on short notice to meet daily redemptions the way an open-end mutual fund would. A tender offer fund works on the same basic principle but leaves the timing and size of each buyback to the board’s discretion rather than a fixed calendar.
What an Interval Fund Actually Is
Strip away the jargon and an interval fund is a legal compromise. Regulators and fund sponsors needed a way to let ordinary investors put money into assets that don’t trade on any exchange, things like direct loans to mid-sized companies, apartment buildings, infrastructure projects, or stakes in private funds, without pretending those assets could be liquidated on a Tuesday afternoon the way a share of an S&P 500 index fund can. The interval fund is the answer they landed on.
Legally, it’s a closed-end fund registered under the Investment Company Act of 1940. That part matters because closed-end funds don’t have to stand ready to redeem shares every business day the way open-end mutual funds do. But unlike the closed-end funds you might picture trading on the New York Stock Exchange, an interval fund doesn’t list its shares anywhere. There’s no ticker you can pull up and watch bounce around during market hours. Instead, the fund sells new shares more or less continuously, at a price tied to its net asset value, and buys back a limited number of shares at set points during the year. It borrows the “always selling” habit from open-end funds and the “we don’t have to redeem on demand” habit from closed-end funds, and welds the two together.
That hybrid design is deliberate. The fund’s illiquid holdings, private loans that might take years to fully repay, real estate that can’t be sold in a week, need time to convert to cash. A repurchase schedule set months in advance gives the manager a known deadline to plan around, rather than an unpredictable flood of redemption requests that could force a fire sale of the fund’s best assets at the worst possible moment.
The SEC Wrapper: Why This Structure Exists at All
To understand interval funds, it helps to understand the problem they were built to solve. Institutional investors, pension funds, endowments, insurance companies, have had access to illiquid, high-yielding private assets for decades through private placements that ordinary investors can’t touch. Those vehicles don’t answer to the SEC’s retail investor protections, don’t have to publish daily valuations, and typically require seven-figure minimums and lockups measured in years.
A Closed-End Fund That Still Takes New Money
Interval funds took the closed-end fund’s flexibility around liquidity and paired it with something closed-end funds traditionally didn’t do well: raising money on an ongoing basis. A traditional closed-end fund typically raises its capital once, in an initial public offering, and then closes to new investment. Its shares subsequently trade on an exchange at whatever price the market sets, which can drift meaningfully above or below the fund’s actual net asset value. An interval fund instead registers on Form N-2 and continuously offers new shares at a price based on NAV, calculated daily or weekly, so an investor buying in next month pays a price tied to the fund’s actual holdings rather than to secondary market sentiment.
Built for Assets That Don’t Trade Every Day
This continuous-offering, periodic-redemption combination is what makes it possible for a fund registered under the same law that governs Fidelity and Vanguard mutual funds to hold a portfolio stacked with direct loans to private companies, non-traded real estate, or interests in private equity and private credit vehicles. None of those assets have a reliable daily market price the way a large-cap stock does. A manager pricing a private loan portfolio might use a combination of discounted cash flow models, comparable transaction data, and third-party valuation firms rather than simply checking a stock ticker. The interval structure gives that manager breathing room, because the fund isn’t obligated to convert those assets to cash on a moment’s notice every time an investor wants out.
How Repurchase Offers Actually Work
The mechanics of getting your money out of an interval fund are governed by a specific SEC rule, Rule 23c-3 under the Investment Company Act, and it’s worth walking through in plain terms because the details determine how much liquidity you actually have.
The Fixed Calendar
An interval fund’s prospectus spells out, in advance, how often it will offer to repurchase shares: every three months, every six months, or every twelve months. This isn’t a promise the fund can quietly walk back when it’s inconvenient. Once the interval is set and disclosed, the fund is contractually bound to conduct that repurchase offer on schedule, sending shareholders a notice roughly two to four weeks ahead of each repurchase date. You submit your request during that window if you want to sell, and the fund settles at the NAV calculated as of the repurchase date, not the date you submitted your request.
Pricing at NAV, Not at the Whims of the Market
This is one of the more underappreciated features of the structure. Because there’s no exchange listing and no bid-ask spread set by traders, you’re not selling at whatever price a buyer happens to offer that day. You’re redeeming at the fund’s calculated net asset value, the same price new investors are paying to buy in around that same time. That removes the discount-to-NAV problem that plagues traditional listed closed-end funds, where shares can trade well below the value of the underlying portfolio simply because sellers outnumber buyers on the open market.
NAV Caps and Proration: What Happens When Everyone Wants Out at Once
The part of interval funds that catches new investors off guard isn’t the schedule, it’s the ceiling.
The 5%-to-25% Band
Rule 23c-3 requires the fund to offer to repurchase somewhere between 5% and 25% of its outstanding shares at each interval, with the exact figure set out in the fund’s fundamental policies. Most funds settle on 5%, the regulatory floor, though some choose a higher figure to offer investors more breathing room. That percentage applies to the fund as a whole, not to your individual account. If the fund has committed to repurchasing 5% of shares each quarter and it receives redemption requests for only 3% of shares, everyone who asked to sell gets paid in full. The cap only bites when demand exceeds supply.
Pro-Rata Cuts in a Crowded Exit
If redemption requests come in above the stated ceiling, say investors want to redeem 9% of shares in a quarter when the fund only committed to buying back 5%, the fund prorates. Every shareholder who submitted a redemption request gets roughly the same fraction of their request honored, in this example, a bit more than half. The rest of the request rolls over, and you’d need to resubmit for the next interval if you still want out. This is precisely the scenario that shows up in interval fund disclosures as a bolded risk factor, and it’s not hypothetical. Funds holding commercial real estate or private credit have hit oversubscribed repurchase offers during periods of market stress, leaving some investors with less liquidity than they expected right when they wanted it most.
How Much of Your Money You Can Actually Get Back, and When
Share of the fund a single repurchase window is obligated to buy back, by vehicle type
Dashed line marks the 5% regulatory floor Rule 23c-3 sets for interval fund repurchase offers. Bar widths are illustrative of typical ranges, not a specific fund’s terms.
Tender Offer Funds: The Close Cousin With a Looser Leash
Tender offer funds share the same DNA as interval funds, closed-end registration, continuous share offering, no exchange listing, but they operate under a different section of the securities laws (typically relying on the tender offer rules rather than Rule 23c-3’s fixed mechanics). The practical difference is discretion. A tender offer fund’s board decides whether to conduct a repurchase offer at all, how large it will be, and when it happens, rather than committing in advance to a fixed quarterly or semiannual schedule.
That flexibility cuts both ways. A board facing a market downturn might scale back a tender offer to protect remaining shareholders from a forced asset sale, which is arguably prudent portfolio management but leaves sellers with less certainty than an interval fund’s contractual schedule provides. On the other hand, a well-managed tender offer fund can sometimes offer more generous buybacks than the interval fund minimum when conditions allow it. If predictability matters more to you than flexibility, the interval fund’s fixed rulebook is generally the safer bet of the two structures. If you’re comfortable with a board making liquidity calls in real time, a tender offer fund isn’t necessarily worse, just different in where the discretion sits.
Why It Matters: Who Actually Uses These Funds and Why
Interval funds and tender offer funds exist because there’s a real gap between what institutions can access and what retail investors have historically been offered. A public pension fund can commit capital to a private credit vehicle for seven years without blinking. A retail investor building a retirement portfolio usually can’t, and shouldn’t, lock up a meaningful chunk of savings for that long without some path to eventually get it back.
The interval fund threads that needle. It gives an individual investor exposure to yields and diversification that private credit, private real estate, or private equity can offer, income streams that don’t move in lockstep with the stock market, without requiring accredited investor status in every case and without a multi-year hard lockup. In exchange, the investor accepts that liquidity is metered rather than continuous. For someone building a long-term income sleeve inside a diversified portfolio, and who isn’t relying on that specific allocation for near-term cash needs, that trade-off can make sense. For someone who might need the money back on short notice, an interval fund is close to the last place that money should sit.
Financial advisors who use these funds tend to size the position modestly, often in the range of 5% to 15% of a client’s investable assets, precisely because the repurchase caps mean a client can’t count on pulling the whole position out in a single quarter if plans change. The fund isn’t meant to be a savings account with a better yield attached. It’s meant to be the illiquid sleeve of a portfolio, held by someone who has already set aside cash and liquid investments for everything else.
Interval Fund vs. ETF vs. Mutual Fund vs. Traditional Closed-End Fund
Laid out side by side, the structural differences become easier to hold in your head. Each of these four vehicles solves a different problem, and the trade-offs mostly come down to what kind of assets they can hold and how quickly you can get your money back.
| Feature | Interval Fund | ETF | Open-End Mutual Fund | Traditional Listed Closed-End Fund |
|---|---|---|---|---|
| Legal wrapper | Registered closed-end fund, continuously offered | Open-end fund traded on an exchange | Open-end fund, not exchange-traded | Closed-end fund, exchange-listed after IPO |
| How you exit | Scheduled repurchase offers, capped and possibly prorated | Sell anytime on the exchange during market hours | Redeem directly with the fund, once per business day | Sell on the exchange at whatever price the market sets |
| Price you receive | NAV as of the repurchase date | Market price, tracks NAV closely via arbitrage | NAV calculated at day’s end | Market price, can trade at a premium or steep discount to NAV |
| Typical holdings | Private credit, non-traded real estate, private equity interests, illiquid debt | Publicly traded stocks, bonds, commodities | Publicly traded stocks and bonds, sometimes less liquid bonds | Public securities, sometimes leveraged, occasionally illiquid sleeves |
| New share sales | Continuous, at or near NAV | Continuous, created and redeemed in-kind by authorized participants | Continuous, at NAV | Fixed at IPO; new shares rare after launch |
| Discount/premium risk | None on redemption; you transact at NAV | Minimal, kept tight by the creation/redemption mechanism | None; always transacts at NAV | Significant; shares can trade well below NAV for years |
| Typical fees | Higher, often 1.5%–3% including underlying manager fees | Low, often under 0.5% | Moderate, varies widely by category | Moderate to high, sometimes with leverage costs added |
The line that jumps out from that table is the discount/premium row. It’s the reason sponsors moved toward the interval fund structure in the first place. A traditional closed-end fund holding illiquid or thinly traded assets can spend years trading at a 10% or 15% discount to its actual NAV, because the exchange price is set by whoever happens to be buying and selling shares that day, not by the value of what the fund actually owns. Interval funds sidestep that entirely by never listing on an exchange and always transacting at NAV. The cost of avoiding that discount risk is the repurchase cap, you trade market-driven pricing risk for capacity-driven liquidity risk.
If you’re weighing an interval fund’s illiquidity against a plain ETF’s constant tradability, it’s worth understanding what actually keeps ETF prices so closely tied to their underlying value in the first place. Our breakdown of direct indexing versus ETFs for tax-loss harvesting walks through how the ETF creation and redemption process works, and why that mechanism doesn’t exist, and can’t exist, for a fund holding private loans that have no public market at all.
Common Misconceptions About Interval Funds
A handful of misunderstandings show up again and again in how people talk about these products.
“It’s basically a mutual fund with a different name.” Not quite. A mutual fund has to honor same-day redemption requests, full stop, which is precisely why mutual funds are restricted from holding much in the way of illiquid assets. An interval fund’s entire reason for existing is that it doesn’t carry that daily redemption obligation, which is what frees it up to hold the illiquid assets a mutual fund legally can’t.
“I can sell whenever I want, just with a delay.” Only up to the cap. If a repurchase offer is oversubscribed, your request gets prorated along with everyone else’s, and the unfilled portion doesn’t automatically carry forward with priority into the next window. You could, in theory, submit redemption requests every single interval for a year and still not get fully cashed out if the fund keeps hitting its ceiling.
“These are the same as a private equity fund, just easier to access.” The underlying assets can overlap, but the structure is meaningfully different. A private equity fund typically has a fixed fund life, capital calls, and distributions tied to when portfolio companies are sold. An interval fund is evergreen, it doesn’t wind down on a schedule, it just keeps operating with the buy-in and buy-back mechanics described above.
“Because it’s SEC-registered, it must be low-risk.” Registration means the fund follows disclosure and governance rules, files regular reports, and operates under the Investment Company Act’s investor protection framework. It says nothing about the risk of the underlying holdings. A private credit interval fund can still suffer losses if borrowers default, and a real estate interval fund can still lose value if property valuations fall. The wrapper is regulated; the risk inside the wrapper is whatever the manager put there.
“The NAV is basically the same as a stock price, just calculated differently.” With illiquid holdings, NAV often relies on periodic third-party appraisals and internal valuation models rather than a live market quote. That introduces a lag, valuations might be updated monthly or quarterly for the least liquid pieces of the portfolio, which means the NAV you’re buying or selling at may not perfectly reflect real-time market conditions the way a stock’s last trade does.
A Practical Checklist Before You Buy In
Before committing money to an interval fund or tender offer fund, it’s worth running through a short list of questions with your own situation in mind.
- Can you go a full year, or longer, without needing this specific portion of your portfolio, even in an emergency?
- What’s the fund’s stated repurchase percentage, and has it actually met that percentage in full during recent intervals, or has it prorated redemption requests?
- How are the fund’s illiquid holdings valued, and how often is that valuation refreshed?
- What’s the total expense ratio, including any fees charged by underlying private funds the interval fund invests into?
- Does the fund use leverage, and if so, how much, and what happens to your downside if the underlying assets lose value while leverage is in place?
- What’s the minimum initial investment, and does the fund require accredited investor or qualified client status for some or all of its share classes?
- How concentrated is the portfolio, by borrower, by property type, by industry, and by geography?
- What happened to the fund’s repurchase offers during the most recent period of market stress, if it’s been through one?
None of these questions have a universally right answer. What they’re really testing is whether the fund’s liquidity terms match your own need for liquidity, and whether the fee load and portfolio concentration are ones you’d accept in exchange for the yield and diversification on offer.
Key Takeaways
- An interval fund is a registered closed-end fund that continuously sells shares at NAV but only buys shares back during scheduled repurchase offers, typically quarterly, semiannually, or annually.
- SEC Rule 23c-3 requires those repurchase offers to cover between 5% and 25% of outstanding shares; if redemption requests exceed that ceiling, the fund prorates.
- The structure exists specifically to let retail-accessible funds hold illiquid assets, private credit, non-traded real estate, private equity interests, without the daily redemption obligation that constrains open-end mutual funds.
- Tender offer funds use the same closed-end wrapper but leave the timing and size of buybacks to board discretion rather than a fixed calendar.
- Because interval fund shares never trade on an exchange, investors transact at NAV and avoid the discount-to-NAV problem that affects many traditional listed closed-end funds.
- The trade-off for avoiding that discount risk is metered liquidity: you generally cannot access your full position on short notice.
- SEC registration governs disclosure and structure, not the risk of what the fund actually owns.
Frequently Asked Questions
What exactly is an interval fund?
An interval fund is a type of registered closed-end fund that sells shares on a continuous basis, similar to a mutual fund, but only allows investors to redeem shares during periodic repurchase offers set out in advance, usually every three, six, or twelve months. This structure lets the fund hold illiquid assets like private credit or non-traded real estate that couldn’t support daily redemptions.
How is an interval fund different from a tender offer fund?
Both are closed-end funds that continuously offer shares and lack an exchange listing. The difference is in how repurchases happen: an interval fund commits, under SEC Rule 23c-3, to a fixed repurchase schedule and a minimum percentage of shares it will buy back each interval. A tender offer fund leaves the decision of whether, when, and how much to repurchase to the fund’s board, giving it more flexibility but less predictability for shareholders.
How often can I actually get my money out of an interval fund?
It depends on the specific fund’s stated interval, disclosed in its prospectus, which will be quarterly, semiannually, or annually. During each repurchase offer, the fund is only obligated to buy back a set percentage of outstanding shares, generally between 5% and 25%, so your actual ability to redeem depends on how many other shareholders are also trying to sell during that same window.
What happens if more investors want to sell than the fund is willing to buy back?
The fund prorates. If redemption requests exceed the repurchase offer’s stated ceiling, each shareholder who submitted a request receives only a proportional share of what they asked for, and the remainder is not automatically carried forward with priority into the next repurchase offer.
Are interval funds registered with the SEC, and does that make them safe?
Yes, interval funds register under the Investment Company Act of 1940 and are subject to SEC oversight, disclosure requirements, and governance standards, including an independent board of directors. That registration governs the fund’s structure and disclosures, not the investment risk of its underlying holdings. A well-regulated fund can still lose money if the private loans, real estate, or other illiquid assets it holds decline in value.
Can I trade interval fund shares on an exchange like an ETF?
No. Interval fund shares are not listed on any stock exchange. You buy shares directly from the fund, typically through a broker or financial advisor, at a price based on net asset value, and you can only sell them back to the fund itself during its scheduled repurchase offers.
References
- U.S. Securities and Exchange Commission: Guidance on Open-End Fund Liquidity Risk Management and Closed-End Fund Structures
- U.S. Securities and Exchange Commission: 17 CFR 270.23c-3 — Repurchase Offers by Closed-End Companies
- Investment Company Institute: Research on Closed-End Fund Structures and Interval Funds
- Financial Industry Regulatory Authority (FINRA): Investor Insights on Alternative Fund Structures and Liquidity Risk
- U.S. Securities and Exchange Commission: Investor Bulletin on Closed-End Fund Basics
