Article
The Afternoon Overlap: Charting LSE and US Markets While Both Are Open
Build a chart-review workflow for the two-hour window when LSE and US markets trade simultaneously, instead of treating it like an overnight scheduling gap.
Most traders splitting attention across a home market and US equities deal with a scheduling gap — one market closes before the other opens. UK traders face a different structure entirely: for roughly two hours each afternoon, LSE and the US markets are both live at the same time. That overlap is not a gap to bridge, it is a window where a trader is genuinely watching two active tapes at once, and the chart-review problem is keeping one coherent record across both.
Quick Answer
Tag every level and drawing with which market it belongs to and whether it was made during the overlap window, then review LSE-only, overlap, and US-only activity as three distinct phases of the same day rather than one blended session — that is what keeps the afternoon overlap reviewable instead of blurred.
Use United Kingdom workflow hub as the wider UK workflow hub. Pair this article with IBKR vs Hargreaves Lansdown, IG & Trading 212: Chart Review & Export Fit when the question is broker-platform fit rather than the overlap-structuring problem specifically.
The UK's Three-Phase Trading Day: LSE-Only, Overlap, US-Only
The London Stock Exchange runs its main session roughly 8:00 AM to 4:30 PM UK time. The US regular session runs roughly 2:30 PM to 9:00 PM UK time (the exact overlap shifts by an hour during the few weeks each year when UK and US daylight-saving transitions fall on different dates). That structure splits a UK trading day into three distinct phases: an LSE-only morning, a roughly two-hour afternoon where both markets are live, and a US-only evening after LSE closes at 4:30 PM.
That three-phase shape is specific to the UK's position between European and US market hours. It is not the same problem as a market that closes before the next one opens, and it is not the same as a market that shares the exact same session as the US — it is a home session that starts alone, briefly runs alongside the US, then hands off entirely.
Why a Live Overlap Is a Different Problem Than a Scheduling Gap
A scheduling gap — the kind traders in most other time zones deal with — is a memory problem: markup made during one session has to survive until the next one is reviewed. The UK's overlap window is not that. During the overlap, a trader is choosing, in real time, how to split attention between an LSE chart and a US chart that are both moving at once.
That creates a different kind of record-keeping risk. A level drawn on an LSE name at 2:45 PM and a note added to a US chart at 2:50 PM can end up looking like they belong to the same continuous session, when in fact they were made five minutes apart while attention was split between two live markets. Without an explicit market tag on each entry, the overlap period is where records are most likely to blur together.
Keeping One Record Across Two Simultaneously-Live Tapes
The fix is not to treat the overlap as a single blended session, and it is not to keep two entirely separate journals either — both approaches lose something. The useful middle ground is one structured record with an explicit market field on every entry, so LSE and US activity made during the same clock window can still be told apart at review time.
That distinction matters most for the overlap phase specifically. LSE-only morning entries and US-only evening entries are already unambiguous by the time of day alone; it is the two-hour window where both markets are live that needs the market tag doing real work.
Fields That Keep the Overlap Window Coherent
The fields worth preserving are the same ones any structured chart record needs, with an explicit market tag and session-phase label added: symbol, market (LSE or US), session phase (LSE-only, overlap, or US-only), timeframe, marked levels, drawings, labels, the invalidation condition, and the action taken.
The session-phase label is what turns a flat timestamp into something reviewable. Two entries made three minutes apart during the overlap are a very different review context than two entries three minutes apart during the US-only evening, and only the phase label makes that distinction visible later.
| Field | What It Preserves | Why It Matters During the Overlap |
|---|---|---|
| Market (LSE vs. US) | Which tape a level actually belongs to | Two live markets at once make this easy to blur without an explicit field |
| Session phase | LSE-only, overlap, or US-only | Distinguishes split-attention entries from single-market ones |
| Levels and drawings | Technical structure at the time | Supports reviewing each market's structure independently |
| Notes and invalidation | The reasoning, not just the outcome | Keeps split-attention decisions traceable after the fact |
Where MyLinedChart Fits
MyLinedChart connects to a trader's own IBKR session through a local Connector and gives LSE and US chart work — including the overlap window — one review and export layer, with market and session-phase carried as explicit fields rather than left to timestamps alone. Use MCP toolkit to see how an AI agent can read that chart context and propose a drawing or indicator in natural language, with every change confirmed before it lands.
Use TradingView vs TrendSpider vs MyLinedChart: Structured Chart Exports for Real Trading Processes to review export fields in detail.
A Practical Way to Test the Workflow
Start with a small watchlist spanning both markets: a couple of LSE names and a couple of US names that get attention during the 2:30-4:30 PM window specifically. Tag market and session phase on every entry for a week, then review the overlap-phase entries as their own group.
If reviewing the overlap group separately surfaces a clearer picture of how attention was actually split than reviewing everything as one timeline, the structure is working. If the distinction still feels arbitrary, that points to which fields need tightening, not to a flaw in treating the overlap as its own phase.
Limits and Claims to Keep Clear
This workflow is educational. It is not investment, trading, tax, legal, or financial advice, and it does not recommend specific LSE or US securities, position sizing, or trading during any particular session phase.
MyLinedChart is global software from Little Bird Trading LLC. It does not guarantee LSE, US, or any exchange's market data, real-time feeds, listing entitlements, broker API access, or automatic trading. Exchange access and data availability depend on the user's own IBKR account and market-data subscriptions.
FAQ
Do LSE and US markets really trade at the same time?
Yes, for roughly two hours each UK afternoon — LSE runs to about 4:30 PM UK time and the US session opens around 2:30 PM UK time. Exact hours shift slightly around UK/US daylight-saving transitions, so specific times should be confirmed against a current market-hours reference.
Does this workflow recommend trading during the overlap window?
No. It is a review and export workflow for keeping LSE and US chart records coherent, not a recommendation to trade during any specific session phase.
Does MyLinedChart provide its own LSE market-data feed?
No. MyLinedChart's market data and connectivity are IBKR-based only, through the local Connector, subject to the user's own account entitlements.
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