May 27 (Reuters) - U.S. stock index futures extended gains on Wednesday, helped by sustained AI-driven momentum, while investors were cautiously optimistic that the U.S. and Iran would reach a deal. .N

** Pony AI Inc PONY.O:
BUZZ - HK shares at 3-week high on strong quarter revenue, outlook optimism nL1N42407P

** Zscaler Inc ZS.O:
BUZZ - Shares slump as revenue forecast misses estimates nL6N4240DN

** Deere & Co DE.N:
BUZZ - Oppenheimer lowers Deere PT on Brazil weakness and margin pressures nL4N4240TC

** MGM Resorts International MGM.N:
BUZZ - Gains after at least two brokerages hike rating nL4N4240V4

** Hims & Hers Health Inc HIMS.N:
BUZZ - Rises as board member boosts stake amid stock rout nL4N4240US

** Firefly Aerospace Inc FLY.O:
BUZZ - Continues ascent on NASA moon mission award nL6N4240NR

** Capri Holdings Ltd CPRI.N:
BUZZ - Up after forecasting annual profit above expectations nL6N4240P2

** Semtech Corp SMTC.O:
BUZZ - Climbs after Q1 sales, profit beat nL6N4240P3