(Adds Platinum Equity, Usinas; Updates Hutchison)
Aug 23 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 2000 GMT on Thursday:
** Britain's competition regulator is starting a formal investigation into the proposed 7.3 billion pound ($9.31 billion) deal to combine supermarket chains Sainsbury's and Walmart's Asda.
** CK Hutchison is set to win EU approval for its 2.45 billion euro ($2.8 billion) deal to buy out Veon from an Italian joint venture after reaffirming a pledge to help rival Iliad's business in Italy, a person familiar with the matter said.
** Brazilian steelmaker Usinas Siderurgicas de Minas Gerais , known as Usiminas, has hired Banco BTG Pactual SA to sell its 70 percent stake in its mining company, one source with knowledge of the matter said.
** Platinum Equity is exploring a potential sale or initial public offering of Vertiv, a provider of backup power and fail-safe systems for data centers, which its private equity owner hopes will value the company close to at least $6 billion, according to sources familiar with the matter.
** Industrial gases groups Linde and Praxair won conditional antitrust approval in Brazil for their planned merger after committing to asset sales, Linde said.
** South Africa's competition watchdog approved Glencore's roughly $900 million bid for Chevron's local and Botswana assets, bolstering its chances of scuppering a rival bid from China's Sinopec.
** The Australian Competition and Consumer Commission cleared the proposed acquisition of APN Outdoor by JCDecaux SA, as well as Ooh!Media's purchase of HT&E Ltd's bus stop advertising business Adshel.
** India's Reliance Communications Ltd said it completed the sale of its media convergence nodes and related infrastructure assets worth 20 billion rupees ($285.4 million) to Reliance Jio Infocomm. (Compiled by Karan Nagarkattiand Tamara Mathias in Bengaluru)