Feb 15 (Reuters) - Italian publisher Mondadori:
* The investment vehicle of former prime minister Silvio Berlusconi says it has raised its share in the group by 2.9 percent to 53.3 percent
* Fininvest held 50.4 percent on Dec. 31 last year
* share buying started on Jan. 2 and ended on Wednesday
* decision due to positive performance of the publisher and trust in its development perspectives, says a statement by Fininvest. Further company coverage: (Reporting by Milan newsroom)
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