* IPO move comes as Vodafone makes takeover approach
* Ono could bring Vodafone bigger presence in rural areas
* Ono sees enterprise value at around 7 bln euros - source
MADRID/LONDON, Feb 12 (Reuters) - Spain's largest cable operator, Ono, said it was pressing ahead with its plan for a stock market sale, putting pressure on Britain's Vodafone to raise its takeover proposal.
Ono, which sells fixed and mobile phone, TV and internet services, has been preparing a 7 billion euro ($9.6 billion) listing to capitalise on strong investor interest in European cable firms.
But Vodafone has approached its private equity owners with a takeover offer, sources familiar with the matter told Reuters this week, seeking to create the biggest rival to Spanish telecoms market leader Telefonica.
Ono said on Wednesday its board did not discuss any takeover proposal at a meeting on Tuesday.
Its shareholders will now attend their annual meeting on March 13 to give formal approval for an initial public offering (IPO), meaning Vodafone is likely to get a couple of weeks to decide whether to increase its price.
"We believe that the acceleration of the IPO may tip the scales in terms of forcing the hand of possible bidders in making up their mind before the IPO, or risk having to pay higher multiples in the future for a takeover," said JB Capital Markets in a note to clients.
A potential competing bidder, U.S.-based Liberty Global controlled by billionaire John Malone, has also expressed an interest in Ono, a person familiar with the situation has said.
Private equity funds Providence Equity Partners, Thomas H. Lee Partners, CCMP Capital Advisors and Quadrangle Capital own 54 percent of Ono.
Analysts said the situation was reminiscent of the stock market sales of European cable operators Kabel Deutschland and Ziggo that were subsequently taken over by Vodafone and Liberty, respectively, at higher prices.
Espirito Santo, in a note to clients, said it still saw Vodafone as the most likely buyer as it could extract greater cost and other benefits from a combination with Ono than Liberty could.
Vodafone has been hit hard in Spain in recent years, where Telefonica has turned the market ultra competitive by folding the four services of mobile, fixed-line, broadband and pay-TV into one cheaper offering for cash-strapped consumers.
The bid by Vodafone - its second after a first offer was rejected - fits with its new strategy of using some of the proceeds from the $130 billion sale of its U.S. arm to invest in its core European networks to allow it to offer bundled services to consumers and offload traffic from its mobile networks.
In Spain, where a long recession has reduced the sums consumers are willing to pay for telephony, Vodafone has been working with Orange to build a fibre network in major cities, mainly Madrid and Barcelona, to offer a wider range of services.
A deal for Ono could work well as the Spanish company is more focused in smaller cities and rural areas and analysts say it would be a stronger fit than with Liberty.
One source, who had been briefed on the Ono board's discussions, said the directors had agreed to first carry out a capital increase of 800 million euros and later sell existing shares for a total of at least 200 millions euros.
Ono believes it has an enterprise value of around 7 billion euros ($9.5 billion), including debt worth 3.4 billion euros. Based on this price, about 25 percent of the company would float on the stock exchange after the listing, the source said.