In a statement, the world's biggest money manager said it had issued an amendment to a SEC filing made on December 10 which had put the size of the stake at 10.14 percent.

It said that had been "an inadvertent overstatement".

BlackRock said it would inform the market of its holdings in Telecom Italia as of today, as requested by Italian regulator Consob, within the next 48 hours.

(Reporting by Stephen Jewkes, editing by Naomi O'Leary)

Stocks treated in this article : Telefonica SA, Telecom Italia SpA