March 13 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 0930 GMT on Wednesday:
** Singapore Telecommunications (SingTel) STEL.SI is looking to sell a significant stake in its wholly owned Australian unit Optus to Canadian private equity giant Brookfield BAM.TO , a source with direct knowledge of the matter said.
** Denmark's Orsted ORSTED.CO said it has agreed to sell stakes in four U.S. onshore wind farms with a total capacity of 957 megawatt to investment group Stonepeak for around $300 million.
** Australia's PSC Insurance (PSI) said it is in talks regarding a possible buyout after being approached by multiple parties, confirming a local media report.
** Steelmaker ArcelorMittal MT.LU said on Tuesday it will acquire a 28.4% stake in Vallourec VLLP.PA for around 955 million euros ($1.04 billion) to increase its exposure in the tubular business.
