Deals of the day-Mergers and acquisitions

Dec 27 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 1200 GMT on Friday:

** UnitedHealth UNH.N and Amedisys AMED.O have agreed to extend the deadline to close their $3.3 billion merger agreement to next year, a regulatory filing showed on Friday. nL4N3NS0JO

** Japanese manufacturing giant Nidec 6594.T said on Friday it has planned to launch a 257 billion yen ($1.6 billion) bid for Makino Milling Machine 6135.T, a surprise unsolicited takeover offer in a country better known for agreed deals. nL1N3NR0ID

** UltraTech Cement ULTC.NS, India's top cement maker, will buy an 8.69% stake in Star Cement STAT.NS, it said on Friday, in a deal worth up to 8.51 billion rupees ($100 million) for a company that rival Adani Group was reportedly interested in acquiring. nL4N3NS0A9

** Turkish drone maker Baykar has bought Italian aircraft producer Piaggio Aerospace, Italy's industry ministry said on Friday, without disclosing financial details. nL8N3NS08Y

(Compiled by Jaiveer Shekhawat)

((JaiveerSingh.Shekhawat@thomsonreuters.com))