(Adds: GXO Logistics, John Wood Group, Raiffeisen Bank...

(Adds: GXO Logistics, John Wood Group, Raiffeisen Bank International, Citigroup Updates: BBVA, PSC Insurance)

May 8 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 1330 GMT on Wednesday:

** Britain's competition regulator will investigate U.S.-based warehousing firm GXO Logistics' GXO.N 762 million pound ($952.2 million) completed buyout of UK peer Wincanton WINAW.L , it said.

** British oilfield services and engineering firm John Wood Group WG.L rejected a potential 1.42 billion pound ($1.77 billion) buyout proposal from Dubai-based firm Sidara, saying it "undervalued Wood and its future prospects".

** Austria's Raiffeisen Bank International (RBI) RBIV.VI has abandoned a bid to buy a 1.5 billion euro ($1.6 billion) industrial stake linked to a Russian tycoon, following pressure from Washington to scrap the deal.

** Citigroup C.N said on Tuesday it is buying a minority stake in Cicada Technologies, a Connecticut-based trading platform focused on Mexican government fixed-income securities.

		** Spanish lender BBVA  BBVA.MC  told Sabadell  SABE.MC  
it was not planning to improve the all-share takeover offer it 

had made for its smaller rival, Sabadell said.

** Australia's PSC Insurance (PSI) will be acquired by Ardonagh Group in a deal valuing the company at A$2.26 billion ($1.51 billion), PSC said, helping the UK-based insurance distribution platform expand its footprint in the region.

** The European Commission is due to rule on June 12 on whether to approve the European Energy Exchange's (EEX) planned acquisition of Nasdaq's NDAQ.O European power trading and clearing business, according to a regulatory filing.

** Japan's SoftBank Group 9984.T is in talks to buy artificial intelligence (AI) chipmaker Graphcore, Bloomberg News reported, citing people familiar with the matter.

** Olam Agri IPO-OLAA.SI increased its offer for Australia's Namoi Cotton (NAM) as an international bidding war heats up between the Singapore-based agribusiness and Dutch company Louis Dreyfus Co (LDC).

** Perpetual (PPT) said that buyout giant KKR & Co KKR.N would acquire its wealth management and corporate trust businesses for A$2.18 billion ($1.43 billion), sending the Australian financial services firm's shares to a five-month low.

** Niagara Energy has wrapped up a $1.36 billion share purchase in Enel Generacion Peru, giving the firm majority control over the local subsidiary of Italian utility Enel.

** South Korea's Samsung Medison said it is acquiring all of France's Sonio SAS, a fetal ultrasound artificial intelligence software company for about 126 billion won ($92.4 million).

** Leo Lithium (LLL) has signed an agreement with China's Ganfeng Lithium 002460.SZ to sell its remaining 40% stake in a mine in Mali for $342.7 million, the Australian miner said.

** Oil and gas producers Santos (STO) and Repsol REP.MC are exploring a sale of a minority stake in oilfields in Alaska they jointly own and develop in a deal that could be worth about $1 billion, according to people familiar with the matter.

** Brazilian pulp and paper company Suzano SUZB3.SA has approached U.S.-based International Paper IP.N to express interest in an all-cash acquisition that would be worth almost $15 billion, according to people familiar with the matter.