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The WMR 4pm fix at 16:00 UK is the benchmark rate used by many funds and companies. The five-minute window around it can produce moves that seem to come from nowhere.

Lessons that come up repeatedly among traders who've been caught by it:

The fix is scheduled, but often ignored. Many scalpers don't have it on their calendar because it's not a data release.

Month-end and quarter-end fixes are bigger. Rebalancing flows from funds can push prices strongly in one direction in the 15–30 minutes before 16:00. The direction is sometimes estimated in advance by bank research, but not reliably.

The reversal after the fix is common. Once fix-related flows are complete, price can drift back. Fading the fix move after 16:05 is a known strategy, though not without risk.

Spreads widen briefly. Even on major pairs.

Practical rules: no new positions from 15:50 to 16:05 UK on normal days. On month-end, extend to 15:30–16:10. If in a position, consider closing before the window.

Has anyone traded the post-fix reversal consistently? What does your data show?

There are two camps on the London 4pm fix, and both have a reasonable argument.

Camp one treats the window as a hazard. The benchmark rate is calculated from trades in a short window around 4pm London, and a lot of real-money flow gets executed against it, month-end rebalancing being the famous example. Spreads can widen, price can spike a few pips in either direction and snap back, and a scalp with a tight stop is exactly the kind of position that gets clipped by noise that has nothing to do with direction. Sitting flat from roughly 3:50 to 4:10 avoids all of that.

Camp two treats the window as a setup. Because the flow is large and predictable in timing, price often drifts into the window and then retraces after it. Fading the extension after the fix, once the order flow has been absorbed, gives a clean reference point and a natural invalidation level.

Here is the catch with both. The behavior is not constant. On an ordinary Tuesday the fix may barely register, while on the last trading day of the month it can dominate the hour. Anyone testing a fix strategy across all days is averaging two very different populations together, and the average hides what is going on.

A middle approach is to split the sample. Quiet days, month-end days and days with a big US data release earlier in the session behave differently, and each deserves its own tally.

Also worth checking is what the broker does with spreads in that window. Some feeds widen noticeably around 4pm London, some barely move, and that alone can flip a strategy from positive to negative on a small account.

If the fix is part of a routine, does the edge come from the move into it or the retrace after it, and does the answer change on month-end?