The London Metal Exchange delayed the start of trading in Asia by 90 minutes on Wednesday, with its electronic platform opening at 9:30 a.m. Beijing time instead of the usual 8 a.m.
Brokers circulated messages about the postponement without giving a reason, according to LME traders who asked not to be identified discussing private information. After the late start, three-month copper futures in London climbed to the highest since March.
The exchange didn't immediately respond to a request for comment.
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