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Shares in mining big Glencore have sunk 12% after it was ordered by US authorities at hand over paperwork referring to a cash laundering probe.
The subpoena from the United States Department of Justice is in relation to compliance with the Foreign Corrupt Practices Act and money-laundering legal guidelines.
It is relating to enterprise dealings in Nigeria, Democratic Republic of Congo and Venezuela from 2007 onwards.
Glencore confirmed it had acquired the subpoena, which it's now reviewing.
A subpoena is a court docket order which compels an organization or particular person to provide bodily proof, or face punishment.
Follow Glencore's share value
"The market has reacted significantly," stated funding bank Credit Suisse. "At this stage we'd stress that that is a easy request for paperwork, quite than an announcement of a formal investigation.
"From our perspective, while it is clearly a risk factor, we stress that these types of requests are more common than perhaps the aggressive drop in the Glencore share price suggests."
Glencore mines and trades commodities and is without doubt one of the greatest corporations within the business.
In May, the corporate stated it anticipated its full-year outcomes to be between $2.2bn (£1.67bn) and $three.2bn after its first-quarter manufacturing had been in keeping with forecasts.
However, earlier this decade it, together with the remainder of the mining business, had a powerful time.
In September 2015, its shares dived after a observe from analysts at Investec stated its fairness worth could possibly be "eliminated", though Glencore responded that it was "operationally and ficially robust".
When it listed on the London market in 2011, its shares have been priced at 530p, however they're at present trading at 307p.