"Investors Brace for Inflation Update, US Futures Muted"

US stock futures remained flat as investors awaited an upcoming inflation update that could impact the market rally, with Berkshire Hathaway nearing a $1 trillion market value after posting record annual profits. Meanwhile, the broader market continued its impressive streak, with the S&P 500 advancing for 15 of the last 17 weeks, prompting concerns about potential vulnerabilities in the market rally related to inflation persistence. Warren Buffett's annual letter emphasized the importance of owning businesses with enduring economics and avoiding the risk of permanent capital loss.