By Emre Peker and Charles Duxbury

ISTANBUL--Turkcell Iletisim Hizmetleri AS (TCELL.IS), Turkey's largest carrier, is likely to keep its current ownership structure after a U.K. court of appeals ruled in favor of controlling stakeholder Cukurova Holding AS.

In its decision on Wednesday the Privy Council in London said Russia's Alfa Group, which had sought to control Turkcell by forestalling repayment on a defaulted debt by Cukurova, would be "obliged to permit them to redeem the charged shares" if the Turkish conglomerate "came up with the appropriate sum by way of principal and interest."

The ruling on the six-year-old trial is a blow to Alfa Group's telecommunication investment arm, Altimo, which had received a 14% stake from Cukurova as collateral for a 2005 loan. The Russian firm claimed that an event of default entitled it to the shares, which would in effect make Alfa Group's Altimo the controlling party in Turkcell.

Cukurova owes Alfa $1.352 billion of debt and interest, according to the U.K. court's decision. The judges "will give a further decision, which will deal with the terms upon which relief from forfeiture will be accorded" to Cukurova, the ruling shows.

Altimo said is a statement after the decision that the court upheld its appropriation of Cukurova's stake and "the unique nature of the collateral" has led the arbitrator to grant the Turkish conglomerate relief from forfeiture.

Cukurova welcomed the decision to be able to redeem its shares from Altimo. The Turkish firm said the court found that the Russian stakeholder "was primarily concerned with the shares not as security for its loan but for the control over Turkcell that they would provide," according to a statement from White & Case LLP, which represented Cukurova in the case.

Write to Emre Peker at emre.peker@dowjones.com and Charles Duxbury at charles.duxburry@dowjones.com

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