Deals of the day-Mergers and acquisitions

(Adds Nippon Steel, South African Airways; updates Kimmeridge, ITC)

March 13 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 2040 GMT on Wednesday:

** U.S. President Joe Biden plans to express concern over Nippon Steel's proposed $14.9 billion purchase of U.S. Steel X.N, a person familiar with the matter told Reuters, pushing the U.S. company's stock 12% lower on bets the deal could face greater political opposition.

** A deal the South African government has been negotiating for three years to sell a majority stake in South African Airways (SAA) has fallen apart, the minister overseeing the company said on Wednesday.

** Kimmeridge Energy Management has submitted a new offer to acquire SilverBow Resources that values the U.S. oil and gas producer at close to $2.1 billion, including debt, the investment firm said on Wednesday.

** Indian FMCG and tobacco giant ITC's shares settled more than 4.5% higher on Wednesday after rising over 8% during the session, as top shareholder British American Tobacco's $2 billion stake sale in the company went through smoothly, removing a key overhang on the stock.

** Italian sports retailer Cisalfa Sport will take over the business and assets of Sportscheck, the companies said in a joint statement , after the German company filed insolvency following the collapse of its Austrian parent Signa.

** Britain's Direct Line said it had rejected a revised 3.17 billion pound ($4.06 billion) takeover bid from Belgian rival Ageas, repeating that it "significantly undervalued" the home and motor insurer.

** Nordic Capital is weighing a sale of German regulatory software firm Regnology, in a deal which could value the business at up to 3 billion euros ($3.27 billion), four people familiar with the matter told Reuters.

** Pension insurance specialist Rothesay has agreed to buy the about 6 billion pound ($7.67 billion) Scottish Widows in force bulk annuity portfolio from Lloyds Banking Group, the companies said.

** Upmarket fashion and homeware retailer TFG said that it has signed a franchise agreement to be British sportswear giant JD Sports Fashion's exclusive retail partner in South Africa.

** Singapore Telecommunications (SingTel) is looking to sell a significant stake in its wholly owned Australian unit Optus to Canadian private equity giant Brookfield, a source with direct knowledge of the matter said.

** Denmark's Orsted 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 said it is in talks regarding a possible buyout after being approached by multiple parties, confirming a local media report.

** Steelmaker ArcelorMittal said on Tuesday it will acquire a 28.4% stake in Vallourec for around 955 million euros ($1.04 billion) to increase its exposure in the tubular business. (Compiled by Rajarshi Roy, Pratik Jain and Mariam Sunny in Bengaluru)