March 20 (Reuters) - The main U.S. indexes were on track to open higher on Monday after President Donald Trump said he would order the military to postpone strikes against Iranian power plants and energy infrastructure following "productive conversations" with Tehran..N

** Exxon Mobil Corp XOM.N:

** Chevron Corp CVX.N:

** Occidental Petroleum Corp OXY.N:

** ConocoPhillips COP.N:

BUZZ - Energy firms fall after Trump postpones strikes on Iranian power plants nL4N40B0Y8

** Rio Tinto PLC RIO.N:

** BHP Group Ltd BHP.N:

** Southern Copper Corp SCCO.N:

** Freeport-McMoRan Inc FCX.N:

BUZZ - Copper miners down as red metal slides to over three-month low nL4N40B0UE

** Newmont Corp NEM.N:

** Harmony Gold Mining Co Ltd HMY.N:

** Gold Fields Ltd GFI.N:

** Sibanye Stillwater Ltd SBSW.N:

BUZZ - Gold miners slide as bullion falls to 4-month low nL4N40B0OO

** United Airlines Holdings Inc UAL.O:BUZZ - Falls on plan to cut more flights, eyes oil above $100 through 2027 nL4N40B0OB

** Synopsys Inc SNPS.O:BUZZ - Rises as source says Elliott builds multibillion-dollar stake nL4N40B0OV

** PG&E Corp PCG.N:BUZZ - Jefferies downgrades PG&E, citing lack of wildfire liability reform nL6N40B0HA

** Apogee Therapeutics Inc APGE.O:BUZZ - Jumps as eczema drug delivers lasting benefit in mid-stage trial nL4N40B0V9

** Insmed Inc INSM.O:BUZZ - Rises as late‑stage trial backs wider use of lung disease drug nL4N40B0WS

** Lifecore Biomedical Inc LFCR.O:BUZZ - Rises as new manufacturing deal supports growth outlook nL4N40B0XW

** Valneva SE VALN.O:BUZZ - Slumps after Lyme disease vaccine's late-stage trial misses target nL8N40B0VK

** MongoDB Inc MDB.O:BUZZ - Gains after Mizuho upgrades to 'outperform' on AI boost nL6N40B0LN

** Cencora Inc COR.N:BUZZ - Rises after $1.1 billion EyeSouth retina deal nL4N40B0YX

** Mobileye Global Inc MBLY.O:BUZZ - Rises on driver monitoring system deal with US automaker nL4N40B0ZH

** Viatris Inc VTRS.O:BUZZ - Rises after Japan approves anxiety disorder drug nL4N40B118

** Uranium Energy Corp UEC.N:BUZZ - Gains on Wyoming, Texas project progress nL4N40B10D

** USA Rare Earth Inc USAR.O:BUZZ - Rises on deal with Arnold Magnetic Technologies nL4N40B115

** FuelCell Energy Inc FCEL.O:BUZZ - Rises on manufacturing expansion plans nL4N40B125

** Vita Coco Company Inc COCO.O:BUZZ - Gains ahead of S&P SmallCap addition, to replace Tegna nL6N40B0PM

** Xilio Therapeutics Inc XLO.O:BUZZ - Rises after surprise quarterly profit nL4N40B0R4

** Stryker Corp SYK.N:BUZZ - Rises as co says cyber incident contained nL4N40B13X

(Rajarshi Roy and Pragyan Kalita)

((Pragyan.Kalita@thomsonreuters.com))