July 22 (Reuters) - U.S. stocks were on track to open lower on Wednesday, pressured by weakness in chip stocks, as investors remained cautious ahead of the first batch of Big Tech earnings that could decide whether Wall Street's AI-driven rally has more room to run..N

** Super Micro Computer Inc SMCI.O:
BUZZ - Surges after strong business update, books $60 billion in orders nL6N43O0HV

** Exxon Mobil Corp XOM.N:

** Chevron Corp CVX.N:

** Devon Energy Corp DVN.N:

** Occidental Petroleum Corp OXY.N:
BUZZ - US energy cos rise as crude hovers near six-week high nL4N43O0QS

** McKesson Corp MCK.N:

** Cardinal Health Inc CAH.N:

** Cencora Inc COR.N:
BUZZ - Generic tariffs may be favorable for drug distributors, Evercore says nL4N43O0QR

** Dyne Therapeutics Inc DYN.O:
BUZZ - Falls after upsized $375 mln share sale nL6N43O0N9

** BioLife Solutions Inc BLFS.O:
BUZZ - Climbs on $1.5 billion Repligen buyout nL4N43O0UP

** GE Vernova Inc GEV.N:

BUZZ - Falls as company misses core-profit estimates nL6N43O0O8

** AT&T Inc T.N:
BUZZ - Rises after strong Q2 wireless subscriber growth nL4N43O0X1

** Cal-Maine Foods Inc CALM.O:
BUZZ - Down after co swings to quarterly loss on decline in egg prices nL6N43O0NA

** OraSure Technologies Inc OSUR.O:
BUZZ - Rises after Bundibugyo Ebola test receives US FDA emergency use nod nL4N43O0Z8

** Celldex Therapeutics Inc CLDX.O:
BUZZ - Falls after scrapping development of skin disease drug nL4N43O12J

** Philip Morris International Inc PM.N:
BUZZ - Down after cutting annual profit forecast nL6N43O0PM

** Arrowhead Pharmaceuticals Inc ARWR.O:
BUZZ - Rises after blood-fat drug meets late-stage trial goals nL4N43O15E