** Shares of Italy's Tinexta TNXT.MI jump as much as 17.3% to 14.1 euros
** Daily Il Corriere della Sera reports that private equity funds Nextalia and Advent are in talks to buy a controlling stake in the cybersecurity services company
** It says the firms valued the company at 700 million euros ($814.45 million) or 15.4 euros/shr
** Broker Banca Akros says this is "a reasonable level from which to start a take-over discussion"
** If confirmed, the premium would be of over 18% to its PT of 13 euros and 28% to Thursday's close of 12.02 euros, the broker adds
** As of 0955 GMT, Tinexta is up 13.5% at 13.64 euros
($1 = 0.8595 euros)
(Reporting by Philippe Leroy Beaulieu)
((Philippe.leroybeaulieu@tr.com))