On August 19, 2026, the US Treasury announced plans to at least double sovereign bond buybacks to reduce 30-year yields during the ongoing US-Iran war that began nearly six months earlier. The S&P 500 rose 0.2 percent after three losing sessions, Wall Street indices advanced, the dollar fell sharply, oil prices increased, and Moderna shares surged. Sources CNA and WSJ reported these market movements and the Treasury's stated goal.