Deals of the day-Mergers and acquisitions

July 12 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 0930 GMT on Friday:

** Global Infrastructure Partners (GIP) and Stonepeak are among the bidders for Singapore Power's 40% stake in Jemena in a potential deal that could value the Australian energy group at over $10 billion, two sources with knowledge of the matter said.

** Mining group Rio Tinto is studying a refreshed list of takeover targets including Teck Resources after the collapse of rival BHP's bid for Anglo American, Sky News reported.

** Australia's competition watchdog has started an informal review of the network sharing deal between TPG Telecom and Optus, owned by Singapore Telecommunications, the regulator said.

** Top shareholder proxy firm ISS has recommended investors vote in favour of Japan's Electric Power Development's (J-Power) A$381 million ($257.56 million) buyout of Australia's Genex Power, according to an ISS report.

** Japan's SoftBank Group has bought artificial intelligence chipmaker Graphcore for an undisclosed sum, ending long-running speculation over the company's future.

** Hedge funds Nut Tree Capital Management and Caspian Capital said on Thursday they have made an offer for Martin Midstream Partners, aiming to scuttle a bid from the fuels storage and transporter's largest shareholder to buy it out.

** Investment firm Anson Funds Management has amassed a stake in Five9 and is urging the U.S. call center software company to consider a sale, people familiar with the matter said. (Compiled by Rajarshi Roy and Christy Santhosh in Bengaluru)