Japan's Nikkei share gauge fell for a second day on Wednesday, as concerns over potential interest rate hikes by the Federal Reserve and AI ‌sector valuations weighed ⁠on ⁠sentiment.The benchmark Nikkei 225 slid 0.88% to close at 69,174.97, retreating further from a record high reached on Monday. The broader Topix slipped 0.67% to 3,963.76. The decline followed overnight losses in U.S. equities, where the ⁠Philadelphia Semiconductor ‌Index sank 7.9% amid worries about debt-funded AI spending and tighter ⁠financial conditions."Speculation that the Federal Reserve is moving ​toward interest rate hikes has heightened ​concerns about rising financing costs for AI capital expenditures, which appears to have accelerated the decline in semiconductor stocks," Sony Financial Group analysts said in a ‌note.There were 91 advancers on the Nikkei, 131 decliners, and three unchanged. Chip-related shares were among the ⁠laggards, with Tokyo Electron dropping 4.19% and Disco losing 3.78%.Insurance stocks also fell sharply, led ​by T&D Holdings , which slid 5.74%. On the upside, retail shares were largely higher, with J. Front Retailing surging 3.99%.