The 4pm London fix
Posted: Fri Oct 30, 2026 6:04 am
Short one. At 4pm London time, a benchmark rate gets set that large funds use to rebalance their currency exposure. Orders pile in around that time, and price can behave strangely in the minutes around it: sudden pushes, quick reversals, spread jitters.
Month-end gets the biggest flows, when index funds and pension funds adjust hedges. A scalper caught in a position at 3:58pm can see the market lurch both ways.
Not everyone trades the fix. Many simply flatten before it. Others watch for a post-fix reversal once the flow is done.
The mechanics are worth knowing. The benchmark is calculated from trades during a short window around 4pm, so orders from funds and corporates get concentrated there on purpose. Dealers who take the other side of those orders hedge in the same window, which adds to the noise. Spreads can flicker wider for a few seconds while the books rebalance.
Past the fix, the move often stalls. Price that ran hard into 4pm sometimes drifts back once the flow is finished, because the buying or selling pressure disappears at the same moment. That fade is the part some scalpers prefer to trade, using a small size and a tight time stop. The trade is simple to define: ten minutes, no more, and out whether it works or not.
The weakness of the whole idea is that fix days differ. Some pass without any visible effect, and a few produce violent moves that go straight through the levels everyone watches. Logging the 3:45 to 4:15 window for a couple of months turns opinion into numbers.
Is the 4pm fix traded, avoided, or never noticed?
Month-end gets the biggest flows, when index funds and pension funds adjust hedges. A scalper caught in a position at 3:58pm can see the market lurch both ways.
Not everyone trades the fix. Many simply flatten before it. Others watch for a post-fix reversal once the flow is done.
The mechanics are worth knowing. The benchmark is calculated from trades during a short window around 4pm, so orders from funds and corporates get concentrated there on purpose. Dealers who take the other side of those orders hedge in the same window, which adds to the noise. Spreads can flicker wider for a few seconds while the books rebalance.
Past the fix, the move often stalls. Price that ran hard into 4pm sometimes drifts back once the flow is finished, because the buying or selling pressure disappears at the same moment. That fade is the part some scalpers prefer to trade, using a small size and a tight time stop. The trade is simple to define: ten minutes, no more, and out whether it works or not.
The weakness of the whole idea is that fix days differ. Some pass without any visible effect, and a few produce violent moves that go straight through the levels everyone watches. Logging the 3:45 to 4:15 window for a couple of months turns opinion into numbers.
Is the 4pm fix traded, avoided, or never noticed?