Who really moves the FX Markets

The largest players in foreign exchange are often not making heroic macro calls. They are hedging portfolios, executing mandates, managing inventory and—occasionally—discovering that everybody wants the same exit at once.

Retail FX education has a casting problem. It gives the starring roles to central bankers, hedge-fund legends and lone macro traders making courageous calls on interest rates. Meanwhile, many of the people actually pushing billions through the market appear in the credits under “hedging, execution and other administrative matters.”

This matters because currencies do not move only when the economic outlook changes. They also move when a pension fund has to rebalance, a multinational has to complete an acquisition, a dealer has too much inventory, or a crowded carry trade begins to unwind.

According to the Bank for International Settlements, global over-the-counter FX turnover averaged $9.5 trillion per day in April 2025, up 27% from April 2022. But turnover is not the same thing as fresh directional conviction. Much of that activity reflects hedging, funding, intermediation and the repeated transfer of existing risk.

Our in-house review of FX market microstructure led to a simple way of organising the cast. The useful question is therefore not simply, “Who traded?” It is:

Who originated the risk, who transmitted it into the market, and who amplified the resulting move?

Those are three different jobs, and they are often performed by three different groups.

1. The biggest flow may have no opinion at all

Newer traders often imagine a large institutional order as the visible expression of a large institutional view: a fund has concluded that the euro is undervalued, summoned several economists and decided to buy it before lunch. Sometimes that happens. Frequently, it does not.

“Real money” institutions—asset managers, pension funds, insurers and passive funds—trade FX because they own assets denominated in other currencies. Their currency transactions may be a secondary consequence of an equity or bond decision, or a mechanical adjustment required by a hedging policy.

Suppose a European pension fund owns a large portfolio of US equities. If those equities rally, the fund’s dollar exposure rises even if it has bought nothing new. To restore its target hedge ratio, it may need to sell dollars forward and buy euros. The trade is not a verdict on US payrolls. It is portfolio maintenance, conducted on a scale at which portfolio maintenance becomes everyone else’s price action.

This is one reason equity performance, hedge ratios and month-end rebalancing estimates can matter for FX. It is also where traders should resist turning a useful mechanism into a universal law. Research on Uncovered Equity Parity finds evidence of reallocation away from past equity winners, but Federal Reserve research also finds that observed reallocations may reflect tactical asset allocation rather than a simple attempt to reduce currency risk.

In other words: equity-driven currency flow is real; the neat classroom version is less reliable. Markets remain disappointingly unwilling to become a single-factor model.

2. Corporates can create trends without caring about your trendline

A multinational company enters the FX market to pay an overseas supplier, convert foreign revenue, hedge a future cash flow or fund an acquisition. None of these activities requires the treasurer to hold a strong opinion about the next central-bank meeting.

Now consider a large cross-border takeover. The buyer may need billions in the target company’s currency. That demand is normally worked over time to reduce market impact, often through several dealers and execution algorithms. The result can be a steady, stubborn move that survives mediocre data, familiar resistance levels and several confident declarations that the pair is “overbought.”

The corporation is not trying to win a directional trade. It is trying to complete a transaction at an acceptable average price. Your RSI has not been consulted.

These flows are difficult to observe directly because dealers protect client information. Their footprints are indirect: persistent buying or selling, shallow pullbacks, resilience to contrary news and price action that feels strangely insensitive to the day’s preferred narrative.

3. The dealer is usually an inventory manager, not a macro prophet

One of the more durable retail myths is that large bank dealing desks spend their days taking enormous naked positions against the public. Modern spot desks are more prosaic. Their core business is making prices to clients, earning a spread and managing the risk that arrives with those trades.

If a client buys £1 billion against the dollar, the dealer taking the other side acquires an inventory problem. It has several choices:

• match the position against an offsetting client order;
• adjust its quoted prices to attract sellers;
• transfer risk internally to another desk or affiliate; or
• hedge the residual position in the wider market.

Matching offsetting client business is internalisation; transferring risk between affiliated desks is intragroup risk management. Together, they allow a dealer group to avoid immediately broadcasting every client trade into the interdealer market. BIS research has found that major electronic FX businesses can internalise more than 90% of client flow in some major currency pairs. The 2025 BIS survey also showed increased intragroup trading and greater dealer capacity to match client business internally.

That has two implications for traders.

First, a very large client order may initially produce surprisingly little visible price impact. The flow has not vanished; it is being absorbed.

Second, when client flow becomes strongly one-way and inventory limits are reached, several dealers may need to hedge externally at roughly the same time. A calm market can then become a thin one rather quickly. Liquidity is often plentiful until everybody requires the same side of it.

4. One decision can generate many trades

Classic FX microstructure describes a “hot potato” process. A dealer receiving unwanted inventory passes some of it to another dealer, who passes some onward again. The original customer decision can therefore generate a chain of interdealer transactions.

Richard Lyons’ NBER research on FX volume made the counter-intuitive point that a burst of dealer-to-dealer activity need not contain a matching burst of new information. It may partly be the market distributing an inventory imbalance already created by one customer order. This is a useful antidote to the idea that every tick represents a fresh, independent opinion. Sometimes ten trades are ten decisions. Sometimes they are one decision being escorted through the plumbing.

5. The 4 p.m. fix is not merely a time on the clock

Many global equity and bond portfolios are valued against benchmark FX rates. Asset managers therefore have an incentive to execute currency conversions close to the same benchmark, reducing the tracking error between the fund and the index it is meant to follow.

The most important of these benchmarks is the WM/Reuters 4 p.m. London fix. For the most actively traded currencies, LSEG calculates the benchmark from trades captured during a five-minute window, from 2 minutes 30 seconds before to 2 minutes 30 seconds after 16:00 London time.

Clients can give dealers orders to transact at the eventual fixing rate. The dealer then carries the execution risk and may hedge that exposure before or during the window, subject to market-conduct rules. When the order imbalance is large—particularly near month-end—the associated trading can concentrate volume and directional pressure around the fix.

This does not mean every move at 15:58 is a free signal, nor that month-end estimates should be treated as divine revelation delivered via spreadsheet. It does mean that timing matters. If a currency accelerates into the fix and then reverses soon afterwards, the market may not have changed its mind about the economy. It may simply have finished an appointment.

6. Hedge funds and CTAs often amplify rather than originate

Discretionary macro funds certainly matter. They can build large positions around growth, inflation, policy divergence and political risk. But on a one-to-five-day horizon, the most dramatic move may occur not when the view is established, but when an existing position is forced to change.

CTAs and other systematic funds tend to respond to price, volatility and trend signals. Their buying can reinforce an existing rise; their selling can deepen an existing fall. When a trend breaks, several models may reduce exposure together.

Carry trades add leverage to the arrangement. A fund borrows in a low-yielding currency—often the yen—to own a higher-yielding asset elsewhere. The trade can appear wonderfully stable until the funding currency strengthens, volatility rises or collateral losses force positions to be cut. Then the fund must buy back the currency it was short, pushing it higher and triggering further stop-outs.

At that point the move is no longer a calm reassessment of fair value. It is a balance-sheet event with a chart attached.

7. Central banks move the reaction function, not just the interest rate

Central banks remain the actors most capable of changing the entire FX regime. They set policy rates, shape expected rate paths, manage reserves and, occasionally, intervene directly.

But even here, the data release alone is not the trade. What matters is the gap between:

• the data that arrived;
• the policy response the market now expects;
• the response already priced into rates; and
• the positions traders already hold.

A soft inflation print can produce little currency weakness if aggressive easing is already priced and the market is already short. A modestly hawkish surprise can produce a large rally if it forces a crowded position to reverse. The same fact can create a different move in a different positioning regime.

That is why professional macro trading focuses on the reaction function—how a central bank is likely to respond—rather than awarding points merely for guessing the economic number.

The practical lesson is not that fundamentals are irrelevant. Fundamentals shape the regime, expected returns and the direction in which large portfolios eventually want to lean. But flow often explains why the currency is moving now, why it keeps moving after the headline has faded, and why it sometimes reverses without waiting for a new economic theory.

So, who really moves the FX market?

Usually not one mysterious whale. More often it is a chain: an asset owner or corporate creates the order; a dealer absorbs and distributes it; the price move activates systematic traders; crowded positions are forced to adjust; and the financial press finds a central-bank quote that looks plausible enough for the closing paragraph.

The explanation may be correct. It may simply have arrived after the flow.