(Adds Vinci, State Power Investment Corp, Eiffage, Barrick Gold Corp, Liberbank; Updates UniCredit)
May 14 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 2000 GMT on Tuesday:
** The parent of top South Korean gaming firm Nexon Co Ltd has delayed the bidding process scheduled this week for its controlling stake in the company, two sources familiar with the matter told Reuters.
** UniCredit has stepped up preparations for a potential bid for Germany's Commerzbank by drafting in investment bankers including a former top German official, three people familiar with the matter said.
** Saudi International Petrochemical Co (Sipchem) and Sahara Petrochemical plan to target acquisitions and joint ventures in the United States and Asia when their merger is completed in order to expand market reach, top executives said.
** Swiss drugmaker Roche Holding AG is pushing back its $4.3 billion takeover offer for gene therapy specialist Spark Therapeutics Inc for a third time in recent months, this time until June 14, as a U.S. regulatory review of the deal drags on.
** Innogy SE has been approached by third parties about its ailing British unit Npower, for which it is considering all strategic options, its finance chief said, adding the group was not in concrete talks to sell the division.
** Thyssenkrupp AG will seek other partners for its steel business or explore strategic ways to develop it after a deal to merge the unit with Tata Steel Ltd's European division failed, its chief executive said.
** French investment fund Ardian is close to buying wind farms from Spanish renewables group Renovalia in a 550 million euro ($617.87 million) deal, two sources with knowledge of the deal said, marking a move into green energy where buyer interest is hotting up.
** French supermarket group Auchan Retail has agreed to sell almost all the activities of its loss-making Auchan Retail Italia arm to Conad, the Italian co-operative retail group.
** A rescue of Carige by a depositor protection fund backed by Italian lenders can only be a short-term solution for the ailing lender, which needs either the state or a rival to take control, the head of Italy's top retail bank was quoted as saying.
** A takeover bid for Germany's Scout24 Holding led by Hellman & Friedman and Blackstone Group Lp has failed as it did not secure the required support of 50 percent of shares, the bidders said.
** Brazilian miner Vale SA is reviewing its assets portfolio, considering their risk and return, the company said in slides prepared for a presentation to investors.
** Italian utility Ascopiave SpA has received a series of non-binding bids for assets it has put up for sale and will select the best bids in 3-4 weeks, the company's chairman said.
** French construction and transport concession group Vinci sealed a deal to take a majority stake in Britain's second biggest airport London Gatwick.
** China's State Power Investment Corp has delivered a binding offer for a stake in the Santo Antônio hydropower dam, two sources with knowledge of the matter said.
** French construction group Eiffage said it had started exclusive talks with Casil Europe, a Chinese investment vehicle, to acquire a 49.99 stake in Toulouse-Blagnac airport in the south of France.
** Barrick Gold Corp, the world's second largest bullion miner, is preparing its Zambian copper mine Lumwana for sale in the second half of 2019, looking to target Chinese buyers, three sources with knowledge of the matter said.
** Spain's Liberbank and Unicaja called off merger talks after the former savings banks said they could not reach a deal over the terms of a share swap. (Compiled by Nivedita Balu and Arundhati Sarkar in Bengaluru)