Citic shares plunged 55.1 per cent to HK$6.52, their lowest close for 17 years.
The company said late on Monday that it was potentially facing about $2bn in forex losses and that its parent company had provided it with a $1.5bn stand-by loan facility to strengthen its position.
That news, combined with investor disappointment over China Mobile's earnings announcement, helped push Hong Kong's benchmark Hang Seng index down 1.8 per cent to 15,041.17.
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