* Shareholders likely to sell at least 90 pct stake in bourse
* Prague bourse sale to be completed by year end
* Prague bourse sale expected to boost competitiveness
(Adds background)
By Jana Mlcochova
PRAGUE, Aug 12 (Reuters) - Shareholders may sell a stake of more than 90 percent in the Prague Stock Exchange (PSE) by the end of the year, the bourse's biggest shareholder said on Tuesday.
The PSE said earlier this month its shareholders, led by investment bank Patria Finance with a 24.85 percent stake, are looking for a partner to buy a majority stake and boost development of the Czech bourse, which analysts value at up to 5 billion crowns ($307.9 million).
"According to my estimate we may get above 90 percent, which confirms that the decision (to sell) is really a decision of the majority," Patria's Chief Executive Jan Klenor said in a telephone interview on Tuesday.
The process of completing the offer should be concluded in the autumn and the bourse could be sold by the end of the year, Klenor said.
He declined to comment on the value of the bourse which analysts estimate at 4-5 billion crowns ($246.3-$307.9 million).
The Prague exchange has lagged its much larger Polish rival in recent years, managing to pick up trading volume but only six new listings in the past decade.
Its main SPAD trading segment lists 14 stocks and has a market capitalisation of $113.6 billion, including two secondary listings of Austrian financial stocks worth $29.7 billion.
"The interest (in the PSE) is there and since the Prague bourse is relatively small, shareholders decided that they will sell," Klenor said.
"It may be a surprise but you can see that Warsaw bourse should be privatised by the end of the year, Budapest is sold... and also the Prague bourse must follow this development so that it can compete with these bourses in the future."
Klenor would not comment on potential bidders, saying it was up to the adviser on the sale, Goldman Sachs, to be in touch with them.
Earlier this month, a source close to the Warsaw Stock Exchange told Reuters the Polish bourse is interested in bidding for its Prague peer to expand its presence in central and eastern Europe emerging markets.
The Vienna bourse has said it may bid for the Czech exchange. Other potential bidders include Deutsche Boerse <DB1Gn.DE> and OMX Nordic Exchange <NDAQ.O>.
Other major shareholders of the PSE, apart from Patria, include Komercni Banka <
>, a unit of Societe Generale <SOGN.PA>, which is also considering selling its 11.51 percent.Erste Bank's <
> <ERST.VI> Czech unit Ceska Sporitelna holds 14.7 percent and venture capital fund Tiger Holding Four controls 13.5 percent, according to PSE's 2007 annual report.The bourse's biggest stock is power firm CEZ <
>, central Europe's largest company with a market capitalisation of over $44.8 billion.Last year, shares worth 1,013 billion crowns ($65.51 billion) and bonds worth 509 billion changed hands on the exchange. The PSE group, which includes an electricity exchange and settlement firms, made a net profit of 198 million.
(Editing by Elaine Hardcastle)