How long was the halt?

The London Metal Exchange's electronic order book resumed after an outage of nearly three hours, Reuters reported. The LME had not issued a member notice, named a cause, or estimated deferred volume as of the brief.

What did the report actually say?

The Reuters item is a short resumption notice. It identifies the venue — the LME — and the channel (electronic trading), and pegs duration at "nearly three hours." It does not name an LME spokesperson, a member firm, or a regulator. It does not list the affected contracts.

Which contracts were in the dark?

The brief does not specify whether the halt touched:

• Copper, aluminum, or zinc
• Nickel — under heightened regulatory focus since the March 2022 short squeeze and multi-day suspension
• Lead, tin, cobalt, or the LME's minor and ferrous products

Base-metals complex outages affect more desks than single-product halts, because the LME cross-margins its primary contracts.

Which session did it cover?

The LME's electronic book runs across the Asian, European, and U.S. trading days. A three-hour outage during the 01:00 London pre-open and early Asian book costs less in missed fills than the same halt during the European session or the late U.S. session, when prompt-contract liquidity peaks.

What happens to resting orders?

Trades that should have printed during the halt leave gaps in member order-management systems. The LME's electronic platform has a defined protocol for orders resting at the time of a halt. Members will want the exchange to confirm whether those orders remain live, were auto-cancelled, or require manual re-entry.

Why does it matter for execution?

The LME runs a three-layer market: open-outcry ring in London, electronic order book, and inter-office kerb. A halt on the electronic layer shifts activity into the other two channels or onto overlapping contracts at CME Group's COMEX and the Shanghai Futures Exchange.

Spread traders in LME–COMEX copper — the most-watched inter-exchange metals pair — face a data-cleanliness question. Did LME prices print during the outage, and if so, will the exchange annotate them? Liquidity providers quoting on both venues will recalibrate internalization thresholds on reopen.

What disclosure comes next?

LME member notices on electronic-platform incidents have historically followed within the same trading day; root-cause reviews within weeks. The Bank of England and the Financial Conduct Authority, which supervise the LME, had not commented in the Reuters item.

Whether the LME publishes a post-mortem — and what it names as the trigger: software, connectivity, market data, or capacity — will set the next moves. Members will weigh internal incident reviews. EMS vendors will consider reweighting LME session availability. The FCA will decide whether to open a follow-up file.