US stock futures fell before the bell on Tuesday as rising bond yields and an early-morning spike in oil prices unnerved investors, prompting them to pare back some of their riskier trades, such as bets on AI and related tech.
Source: [Bloomberg Markets](https://www.bloomberg.com/news/articles/2026-08-18/us-stock-index-futures-drop-as-bond-yields-oil-prices-rise)