What changed in my NAS100 plan for Friday afternoon

[LondonScalper]

For the last three years my Friday afternoon NAS100 plan had one rule: don't. I stopped trading index CFDs after 15:00 London on Fridays because my results were poor and the moves felt random.

This autumn I've loosened that a little, for one specific reason. I looked at the data properly instead of relying on memory, and found that the bad results were almost all from 15:00 to 16:30. The window from 14:30 (the US cash open) to 15:00 was actually fine, and better than some weekday afternoons.

So the new plan for Friday afternoon looks like this.

Trading window: 14:30 to 15:15 London only. A hard stop at 15:15, with an alarm.

Size: two thirds of my normal size.

Setups allowed: only the opening range break and the first pullback after the US open. No fades, no range trades, no counter-trend scalps.

Maximum two trades. If the first one loses, I'm done for the week.

No trading at all if there is US data at 15:00, which happens more often than people think.

I've traded this for five Fridays. Three winners, one loser, one Friday with no setup. That's nowhere near enough to say anything, and I'm well aware that five good weeks tend to make me feel smarter than I am.

The bigger change is psychological. I no longer spend Friday afternoon pretending not to watch the chart.

[PTScalper]

For the last three years my Friday afternoon NAS100 plan had one rule: don't. I stopped trading index CFDs after 15:00 London on Fridays because my results were poor and the moves felt random.

This autumn I've loosened that a little, for one specific reason. I looked at the data properly instead of relying on memory, and found that the bad results were almost all from 15:00 to 16:30. The window from 14:30 (the US cash open) to 15:00 was actually fine, and better than some weekday afternoons.

So the new plan for Friday afternoon looks like this.

Trading window: 14:30 to 15:15 London only. A hard stop at 15:15, with an alarm.

Size: two thirds of my normal size.

Setups allowed: only the opening range break and the first pullback after the US open. No fades, no range trades, no counter-trend scalps.

Maximum two trades. If the first one loses, I'm done for the week.

No trading at all if there is US data at 15:00, which happens more often than people think.

I've traded this for five Fridays. Three winners, one loser, one Friday with no setup. That's nowhere near enough to say anything, and I'm well aware that five good weeks tend to make me feel smarter than I am.

The bigger change is psychological. I no longer spend Friday afternoon pretending not to watch the chart.

Hi,

This might be the most valuable takeaway from your entire post. We’ve all been in that purgatory where we enforce a "no trading" rule based on past trauma, but end up glued to the screen anyway, ghost-trading every candle and burning mental capital. By building a highly constrained, data-driven sandbox, you've taken back control of your Friday afternoon psychology.

Your breakdown of the time window is a perfect example of why digging into market microstructure beats relying on memory. Memory tells us "Friday afternoons are a choppy mess." The data reveals that the 14:30 London (09:30 NY) cash open injects a massive, structural liquidity sweep into the NAS100 order book. That initial 30 to 45-minute window is driven by genuine institutional volume and opening momentum. It’s only after 15:15—when the European desks start packing up for the weekend and the initial NY rush settles—that the volume thins out and the random, algorithmic chop begins. You essentially isolated the signal and cut out the noise.

[PTScalper]

Limiting yourself to just the Opening Range Break and the first pullback aligns perfectly with raw price action principles. When you have that much localized volume hitting the tape at 14:30, trying to fade it or trade the range is a great way to get run over. You are hunting the momentum, not fighting it.

Your mechanical guardrails are exactly what this environment requires:

The 15:00 Data Trap: Phenomenal filter. 10:00 AM NY (15:00 London) is notoriously dangerous on Fridays because of University of Michigan Consumer Sentiment, JOLTS, or ISM data drops. If you are already in a trade, it can slip your stop; if you aren't, the news creates a spread dynamic that ruins scalping precision.

The "One Loss and Done" Rule: Capping the max trades at two, but implementing a hard stop if the first one loses, is top-tier weekly PnL protection. A Friday afternoon revenge-trading spiral is the fastest way to ruin a weekend.

Position Sizing: Dropping to two-thirds size is a great bridge. It satisfies the psychological need to participate in high-probability setups without risking the bulk of the week's hard-earned equity.

[PTScalper]

Five weeks is absolutely a small sample size, and you are right to be wary of the "feeling smarter than the market" phase. But what you are testing right now isn't just the win rate of the ORB—it's your ability to execute a highly restricted operational protocol without breaking your own rules.

If you can respect that hard 15:15 cutoff and walk away the moment the alarm sounds, you've already won the hardest part of the trade. Keep tracking those metrics. I'd be very curious to see what the win rate and drawdowns look like once you cross the 20-trade mark.

[Fairman]

Trading window: 14:30 to 15:15 London only.

Worth checking the plan against the calendar for the next few weeks, because the window is fixed in London time and the US open isn't. Britain leaves summer time a week before America does this year, so for the week of 26 October the US cash open is at 13:30 London and the 10:00 New York data slot moves to 14:00. On Friday 30 October a 14:30 to 15:15 window would start an hour into the US session, after the opening range break has already happened. Also, the 15:00 London slot on many Fridays carries the University of Michigan sentiment release, so a hard stop at 15:15 is cutting it close on those days. Writing the window as US open to US open plus 45 minutes, with the London times noted each week, avoids both problems.

[FXS Prop Desk]

The 15:00 London data trap is a good catch. On Fridays it varies week to week (UoM sentiment, sometimes ISM or JOLTS depending on the calendar), so a fixed "no trades at 15:00" rule is simpler than checking which release it is.

One addition for NAS100 specifically: the 14:30 open often combines with US data released at the same minute, and index CFD spreads can be several points wide for the first minute. If the ORB uses the first five minutes, measuring the range from 14:31 instead of 14:30 avoids one bad print setting the whole range.