16 March 2026

S&P 500 Falls as Oil Prices Spike

An editorial cartoon of a suit-wearing Wall Street bull and bear who react to a news ticker that says 'IRAN WAR' and 'OIL PRICE SPIKE' and 'RATE CUTS DELAYED' by screaming. Image generated with Microsoft Copilot Designer.

The S&P 500 (Index: SPX) dropped another 1.6% during the second trading week of March 2026, closing at 6,632.19 on Friday, 13 March 2026. The index is five percent below its 27 January 2026 record high of 6,978.59.

Stock prices continued falling during this week as oil prices surged over $100 per barrel because of the Islamic Republic of Iran's efforts to close the Hormuz Strait in response to U.S. and Israeli military action against its government.

The surge in oil prices has raised the spectre of higher inflation, which in turn has made more Federal Reserve rate cuts, which had been widely expected, much less likely. The CME Group's FedWatch Tool projects the Fed will delay an expected quarter point reduction in the Federal Funds Rate steady until 16 September (2026-Q3), twelve weeks later than what was anticipated a week earlier. The tool does not anticipate any other interest rate changes in 2026.

The latest update of the alternative futures chart shows the trajectory of the S&P 500 following along near the bottom of the redzone forecast range during most of the week and dropping slightly below it on Thursday and Friday.

Alternative Futures - S&P 500 - 2026Q1 - Standard Model (m=-2.0 from 28 Apr 2025) - Snapshot on 13 Mar 2026

For analytical purposes, we can use the middle of the redzone forecast range to reasonably represent what path the S&P 500 would have taken if not for the impact of the Iran war. At this writing, the index would be around four percent higher than it is two weeks after the beginning of the geopolitical event.

Speaking of which, you can see some of the ebb and flow of it in the market-moving headlines of the week that was.

Monday, 9 March 2026
Tuesday, 10 March 2026
Wednesday, 11 March 2026
Thursday, 12 March 2026
Friday, 13 March 2026

The Atlanta Fed's GDPNow tool forecast of real GDP growth in 2026-Q1 jumped to +2.7%, rebounding from the +2.1% growth anticipated a week earlier.

Image credit: Microsoft Copilot Designer. Prompt: "An editorial cartoon of a suit-wearing Wall Street bull and bear who react to a news ticker that says 'IRAN WAR' and 'OIL PRICE SPIKE' and 'RATE CUTS DELAYED' by screaming".