Caterpillar falls as AI-spending worries overshadow Q3 beat

** Shares of construction equipment maker Caterpillar CAT.N fall ~9% to $649.39 premarket after Q3 results

** Stock falls as investors turn cautious on AI boom; scrutiny grows over data center spending and returns

** Data center opposition, calls to slow AI development add to worries

** Co maintains FY sales growth view despite strong demand for backup power equipment

** Q3 adjusted profit per share of $7.20 beats analysts' avg est of $7.08, per LSEG-compiled data

** Q3 revenue of $20.68 bln beats est $20.55 bln

** Power generation up 30% on turbines, large engines mainly for data centers

** Operating profit includes $128 mln of IEEPA tariff recoveries

** As of last close, stock has risen 24.5% YTD