Traders assign Iran only a 5% chance of possessing a nuclear weapon by the end of 2026 primarily because U.S. and Israeli strikes in June 2025 severely damaged key enrichment facilities at Natanz, Fordow, and Isfahan, leaving the program largely dormant with no verified resumption of large-scale activity. Roughly 440 kilograms of 60% enriched uranium remain unverified by the IAEA due to restricted access, yet weaponization, testing, and integration into a deliverable device require additional infrastructure and time that current constraints make improbable within the remaining months. Ongoing U.S.-Iran negotiations over stockpile downblending or removal under IAEA supervision add further diplomatic friction. Breakout scenarios could still emerge from undetected recovery of the material, accelerated covert efforts amid stalled talks, or sudden policy shifts by Iranian leadership.