US equity futures moved lower Tuesday after the long weekend as higher energy prices pressured corporate margin expectations and increased concerns that interest rates could remain elevated. S&P 500 and Nasdaq 100 futures fell 0.5%, while Dow futures declined nearly 1%. New strikes between the US and Iran extended expectations that fuel exports from the Persian Gulf would remain suspended, while Houthi attacks damaged Saudi energy infrastructure and reduced its capacity. US corporate borrowing costs also rose amid hawkish signals from the Bank of Japan and the possibility that Japan would sell US Treasury securities to support the yen. Credit-sensitive hyperscalers, or large cloud-computing companies, weakened, with Microsoft and Alphabet each down 1%. Amazon fell 1% ahead of a sterling bond offer as AI companies increasingly borrow in foreign currencies while the dollar bond market faces soaring AI-debt supply. Oracle gained 4.5% ahead of earnings later this week.