Investment trusts and open-ended funds (OEICs and unit trusts) both give investors access to professionally managed, diversified portfolios, and in some cases invest in very similar underlying assets, sometimes even managed by the same team at the same asset management group. Yet their legal structures differ in ways that create meaningfully different investor experiences, particularly around pricing, liquidity, and the tools available to the manager. This article sets out the structural differences that matter most.
The fundamental structural difference: closed-ended versus open-ended
An investment trust is "closed-ended" — a fixed number of shares are issued (except on the relatively rare occasions when a trust raises further capital or is wound down), which then trade on the stock exchange between investors, exactly like shares in any other listed company. An open-ended fund, by contrast, creates new units or shares when investors put money in, and cancels them when investors withdraw, meaning the fund's total size grows and shrinks directly in line with investor demand.
How this structural difference cascades into other distinctions
Pricing: market price versus net asset value
An investment trust's share price is determined by supply and demand on the stock exchange, and can trade at a discount or premium to its underlying net asset value (NAV). An open-ended fund's price is calculated directly from its NAV at each valuation point, meaning investors buy and sell at (or very close to) the actual value of the underlying assets, without a discount or premium mechanism.
Gearing (borrowing to invest)
Investment trusts can borrow money to invest alongside shareholder capital (gearing), because their fixed, permanent capital base allows longer-term borrowing arrangements. Open-ended funds are generally far more restricted in their ability to borrow, since they must always be able to meet investor redemption requests, which is harder to guarantee alongside significant borrowing.
Managing investor flows
Because an investment trust's capital is fixed, a manager does not need to sell holdings to meet investor withdrawals, nor buy new holdings simply because new money has arrived — the manager can focus purely on long-term portfolio construction. An open-ended fund manager must handle continuous inflows and outflows, which can occasionally force buying or selling of underlying assets at less-than-ideal times, purely to manage investor cash flow rather than for investment reasons.
Investing in illiquid assets
The closed-ended structure makes investment trusts particularly well suited to holding harder-to-sell assets — such as property, infrastructure, private equity, or unlisted companies — since the manager is never forced to sell such assets quickly to meet redemptions. Open-ended funds holding significant illiquid assets have, at times, faced difficulties meeting redemption requests during periods of high investor withdrawals, occasionally leading to a temporary suspension of dealing.
Comparing the two structures directly
| Feature | Investment trust | Open-ended fund (OEIC/unit trust) |
|---|---|---|
| Structure | Closed-ended, fixed shares traded on an exchange | Open-ended, shares/units created and cancelled as needed |
| Pricing | Market price, can differ from NAV (discount/premium) | Priced directly from NAV |
| Ability to gear (borrow to invest) | Yes, generally permitted within limits | Generally very limited |
| Suitability for illiquid assets | Well suited, due to fixed capital base | Can face liquidity challenges if illiquid assets form a large proportion |
| Trading | Throughout market hours, like a listed share | Usually once daily, at a single valuation point |
| Dividend smoothing via revenue reserves | Permitted, allowing income to be retained and released across years | Generally must distribute substantially all income each year |
Governance differences
An investment trust has its own independent board of directors, elected by and accountable to shareholders, with a duty to oversee the manager's performance and, if necessary, replace the manager or take other action in shareholders' interests. Open-ended funds are typically overseen by a depositary or trustee, alongside the fund manager's own internal governance and regulatory obligations, but do not have an independent shareholder-elected board in the same way.
Risk considerations specific to each structure
Investment trust-specific risks
- Discount/premium volatility, which can amplify or offset the return from the underlying portfolio.
- Gearing risk, if the trust uses borrowing, which magnifies both gains and losses.
- Generally lower average trading liquidity than very large open-ended funds or major ETFs, for smaller trusts in particular.
Open-ended fund-specific risks
- Potential for dealing suspensions in extreme circumstances, particularly for funds holding significant illiquid assets.
- Forced buying or selling of underlying holdings driven by investor flows, which can occasionally affect performance independent of the manager's investment views.
A worked example: the same strategy, two structures
Suppose a hypothetical asset manager runs two similar UK equity income strategies — one as an investment trust, one as an OEIC — both holding a broadly similar portfolio of dividend-paying UK companies. During a period of market stress, both portfolios' underlying value might fall by a similar amount, say 15%. The OEIC's price would likely fall by approximately that same 15%, since it is priced directly from NAV. The investment trust's share price, however, might fall by more — say 22% — if investor sentiment also causes its discount to widen from, for example, 2% to 10% over the same period, on top of the underlying NAV decline. Later, if sentiment recovers and the discount narrows back towards its original level, the trust's share price could then recover by more than the underlying NAV's own recovery, purely from the discount narrowing again. This example is a simplified, hypothetical illustration of how the two structures can behave differently even holding similar underlying assets, not a prediction of actual fund behaviour.
How each structure handles a sudden surge in investor demand
When a large number of investors want to buy into a strategy at the same time, an open-ended fund simply creates new units or shares to meet that demand, with the fund manager then investing the new cash into the market. An investment trust cannot create new shares on demand in the same way (except through a formal, board-approved further share issue), meaning a surge in buying demand for a popular trust is more likely to show up as a rising premium to NAV, or a narrowing discount, rather than the fund itself simply growing to absorb the new money. This is one of the clearest practical illustrations of how the closed-ended structure changes the relationship between investor demand and the vehicle's price.
Costs and charges compared
Ongoing charges figures for investment trusts and open-ended funds pursuing similar strategies are often broadly comparable, though investment trusts may also incur additional costs related to their stock exchange listing, independent board of directors, and any borrowing used for gearing, which are reflected in their overall cost disclosures. It is worth comparing the full ongoing charges figure (which for trusts typically includes these additional listed-company costs) rather than assuming either structure is inherently cheaper, since this varies by trust and by comparable open-ended fund.
Which structure might suit different investor priorities
- Investors prioritising price closely tracking underlying asset value, with no discount/premium consideration, may find open-ended funds more straightforward.
- Investors interested in strategies involving illiquid assets, or wanting the potential for gearing to be part of the strategy, may find investment trusts better suited structurally.
- Investors who want to buy or sell at a specific point during the trading day, rather than waiting for a single daily valuation, may prefer the exchange-traded nature of investment trusts (shared with ETFs).
- Investors who prefer to avoid the added complexity of monitoring a discount or premium alongside underlying performance may lean towards open-ended alternatives where available.
Historical context: why both structures continue to coexist
Despite decades of competition and evolution in the UK fund industry, neither structure has displaced the other, largely because each serves genuinely different purposes well. Open-ended funds remain dominant for straightforward, liquid, broadly diversified strategies where daily dealing at NAV is valued, particularly within workplace pensions. Investment trusts have carved out a lasting role specifically where their structural features — gearing, permanent capital, and suitability for illiquid assets — provide a genuine advantage, which is why they remain especially prominent in specialist and income-focused sectors even as passive, low-cost open-ended funds and ETFs have grown enormously in the mainstream equity space.
A practical starting point for comparison
When comparing a specific investment trust against a similar open-ended fund, reviewing the trust's current discount or premium, its gearing level, its ongoing charges figure (including listed-company costs), and its dividend policy alongside the open-ended fund's ongoing charges and income distribution approach gives a reasonably complete basis for understanding how the two compare for a specific strategy of interest.
How share classes and account access can differ
Open-ended funds often provide multiple share classes with differing charges depending on the size of the initial investment or the specific platform used, while investment trusts have a single class of ordinary share generally available to all investors on the same terms (setting aside historical or specialist trusts with more complex share structures). Additionally, not all investment trusts are available on every platform, and some, particularly smaller or more specialist ones, may only be accessible through certain brokers, which is worth checking before assuming a specific trust of interest can be purchased through an existing account.
Key takeaways
- Investment trusts are closed-ended, trading on an exchange at a price that can differ from net asset value; open-ended funds are priced directly from NAV.
- Investment trusts can use gearing and are well suited to holding illiquid assets, due to their fixed capital structure.
- Open-ended funds must manage continuous investor inflows and outflows, which can occasionally affect underlying trading decisions.
- Investment trusts have an independent board of directors; open-ended funds are overseen by a depositary or trustee alongside the manager's own governance.
- The discount/premium mechanism in investment trusts can amplify or offset underlying portfolio performance, a dynamic that does not exist for open-ended funds.