Hong Kong's Exchange Fund, managed by the Hong Kong Monetary Authority (HKMA), is an official reserve fund of about HK$4.2 trillion. It backs the Hong Kong dollar's peg through a Backing Portfolio and seeks returns through an Investment Portfolio, including a private-markets Long-Term Growth Portfolio.
Hong Kong's Exchange Fund is one of the largest and most unusual official investment pools in the world. Managed by the Hong Kong Monetary Authority (HKMA), it is first and foremost the financial machinery that keeps the Hong Kong dollar pegged to the US dollar — and only second an investor seeking returns. At about HK$4.2 trillion, it ranks among the biggest reserve funds on the planet, and its Long-Term Growth Portfolio makes it a familiar counterparty to private-markets managers and fellow universal owners. Understanding how the two roles coexist is the key to understanding the fund.
What is the Hong Kong Exchange Fund?
The Exchange Fund was established under the Exchange Fund Ordinance in 1935, originally to hold the reserves backing Hong Kong's note issue. Today it is managed by the HKMA, Hong Kong's central-banking institution. Its statutory purpose, in order of priority, is to safeguard the exchange value of the Hong Kong dollar and to maintain the stability and integrity of the monetary and financial system. Earning a return on the assets is a genuine but explicitly subordinate objective.
That ordering matters. Unlike a sovereign wealth fund, whose reason for existence is to grow national savings, the Exchange Fund's reason for existence is monetary stability. Every investment decision is made subject to the constraint that the fund must always be able to defend the currency peg and support the banking system in a crisis.
How large is the Exchange Fund?
Total assets rose to HK$4,151.4 billion — roughly US$530 billion — at the end of 2025, up from HK$4,081.0 billion a year earlier, an increase of HK$70.4 billion over the year. The fund's accumulated surplus, the buffer built up from decades of investment gains, stood at HK$936.1 billion at end-December 2025.
That scale makes the Exchange Fund one of the largest pools of official reserves in the world and a systemically important asset owner in Asia. Its holdings of US Treasuries and other dollar assets alone make it a meaningful participant in global fixed-income markets.
How is the Exchange Fund structured?
The fund is deliberately split so that its stability mandate and its return mandate do not conflict. Two portfolios sit at the core.
The Backing Portfolio holds high-quality, highly liquid US dollar assets — principally short-dated US government securities. Its job is to ensure that the entire Monetary Base is fully backed by US dollar assets, as required under Hong Kong's Linked Exchange Rate System (the currency board that fixes the Hong Kong dollar at around 7.80 to the US dollar). This portfolio must be liquid enough to honour Convertibility Undertakings on demand, so it prioritises safety and liquidity over yield.
The Investment Portfolio holds bonds and equities, mainly in the markets of OECD economies. Its purpose is to preserve the long-term value of the fund's assets and to generate returns above what the Backing Portfolio can earn. This is where the Exchange Fund starts to look like a conventional institutional investor.
What is the Long-Term Growth Portfolio?
The most sovereign-fund-like part of the Exchange Fund is the Long-Term Growth Portfolio (LTGP), established in 2009 to invest in private equity, real estate and other alternative assets. By moving a slice of the reserves into illiquid, higher-returning assets, the HKMA is doing exactly what large pension and sovereign funds do: harvesting an illiquidity premium with capital it does not need for near-term liquidity.
The results have been strong. The LTGP recorded an annualised internal rate of return of about 11.2% from its inception in 2009 to the end of September 2025 — a return profile that comfortably exceeds the fund's liquid portfolios and rivals that of dedicated private-markets investors. A related vehicle, the Future Fund, was seeded in 2016 with an uplift including US$28 billion from the Land Fund to pursue higher long-term returns over a defined horizon.
How did the Exchange Fund perform in 2025?
The Exchange Fund earned an overall investment return of 8.0% in 2025. The split between its portfolios is instructive: the Investment Portfolio returned 12.4%, buoyed by strong global equity and bond markets, while the Backing Portfolio gained 5.2%, reflecting its conservative, liquidity-first composition.
That divergence is by design. The Backing Portfolio is not trying to maximise return — it is holding the liquid dollar assets that guarantee the currency peg. The Investment Portfolio and the LTGP are where the fund reaches for return. A single blended number therefore understates how differently the fund's two halves are managed.
Is the Exchange Fund a sovereign wealth fund?
The Exchange Fund appears in most global sovereign-fund rankings, but it is more precisely a currency-board reserve fund with a sovereign-fund appendage. Its foundational duty — defending the Hong Kong dollar peg and backstopping the financial system — is a central-bank function, not a savings mandate. Yet through its Investment Portfolio and Long-Term Growth Portfolio it invests across public and private markets with the horizon and sophistication of a large institutional owner.
For universal owners, this hybrid character is precisely what makes it worth understanding. The HKMA shows how a monetary authority can run a genuine long-horizon investment programme without compromising its stability mandate — a governance model of growing interest as more central banks consider deploying "excess" reserves into return-seeking portfolios. And as an LTGP investor, the Exchange Fund shows up as a limited partner and co-investor alongside the world's largest allocators.
The bottom line
Hong Kong's Exchange Fund is a HK$4.2 trillion official reserve fund that wears two hats: guardian of the currency peg through its liquid Backing Portfolio, and long-horizon investor through its Investment Portfolio and Long-Term Growth Portfolio. Its 8.0% return in 2025 and 11.2% annualised private-markets performance make it one of Asia's most important — and most distinctive — universal asset owners.