Qualcomm Inc. posted fiscal third-quarter results that edged past analyst expectations, yet the shares fell more than 4 percent in late trading as investors weighed a cautious outlook for smartphone demand and trade headwinds. Adjusted earnings rose 19 percent from a year earlier to $2.77 a share, while revenue gained 10 percent to $10.37 billion, both modestly ahead of consensus forecasts. Handset sales increased 7 percent to $6.33 billion, and Chief Executive Officer Cristiano Amon highlighted continued strength in automotive and internet-of-things chips. For the current quarter, Qualcomm projected revenue of $10.3 billion to $11.1 billion and adjusted profit of $2.75 to $2.95 a share, ranges that bracket Wall Street estimates. Arm Holdings Plc, meanwhile, reported fiscal first-quarter revenue of $1.05 billion—up 12 percent year on year but just shy of expectations—while adjusted earnings matched forecasts at $0.35 a share. Royalty revenue climbed 25 percent to $585 million, yet the Cambridge-based company said heavier investment in research and new chip designs will curb near-term profitability. It forecast second-quarter revenue of $1.01 billion to $1.11 billion and adjusted earnings of $0.29 to $0.37 a share, both below the midpoint of analyst projections, sending its stock down roughly 8 percent after hours. The contrasting results highlight the uneven landscape for semiconductor companies as they navigate softer handset sales, escalating tariff costs and voracious demand for chips that power artificial-intelligence, automotive and industrial applications.