S&P 500 Bulls Ride Wave Down To Close Best Month Since 2023

The S&P 500 (Index: SPX) fell 0.8% to close the trading week ending on Friday, 30 May 2025 at 5,911.69.

Despite that anticlimactic decline, May 2025 was the best month for the index since November 2023.

The index gained 342.63 points, or 6.2%, in the month since markets closed on 30 April 2025. Much of the strength behind the gain in stock prices came on the basis of two developments. First, the U.S. and China struck a deal to slash tariffs for 90 days.

Second, and perhaps more significantly, inflation was far lower than expected throughout the month, contradicting the predictions of Federal Reserve officials who have staked their interest rate policy on a hypothesis that tariffs would cause inflation to spike. The difference between hypothesis and reality may force Fed officials to reevaluate their course of action.

Overall, we find the trajectory of the S&P 500 is now consistent with investors focusing their forward-looking attention on 2025-Q4 as it has now moved beyond the end of the redzone forecast range on the alternative future chart. The latest update to the chart suggests the market may have experienced a new Lévy flight event in the past week, with investors shifting their attention from 2025-Q2 to the more distant future quarter of 2025-Q4. We think the change is being prompted by the changing likelihood of interest rate cuts later in the year based on the absence of the Fed's predicted increase in inflation.

Alternative Futures - S&P 500 - 2025Q2 - Standard Model (m=+4.0 from 24 Feb to 8 Apr 2025, m=+1.0 from 9 to 25 Apr 2025, m=-2.0 from 28 Apr 2025) - Snapshot on 30 May 2025

Though we're favoring the Lévy flight explanation for the past week's action, we haven't fully ruled out the potential for another market regime adjustment like those that have become remarkably frequent in recent months. For now however, we think the past week's change in stock prices is more consistent with a run-of-the-mill Lévy flight event.

Although it was a holiday-shortened trading week, there was quite a lot of market-moving news crammed into it. Here are the week's market-moving headlines.

Tuesday, 27 May 2025

Wednesday, 28 May 2025

Thursday, 29 May 2025

Friday, 30 May 2025

The CME Group's FedWatch Tool still projects the Fed will avoid cutting the Federal Funds Rate until the conclusion of its 17 September (2025-Q3) meeting, at which time, it will cut rates by a quarter percent to a target range of 4.00-4.25%. After that, the FedWatch Tool forecasts the Fed will reduce U.S. interest rates by another quarter point on 10 December (2025-Q4), but curiously, may act to cut rates by a quarter point a third time just six weeks later on 28 January (2026-Q1).

The Atlanta Fed's GDPNow tool projection of real GDP growth in the U.S. during the current quarter of 2025-Q2 spiked upward to +3.3%, up from the +2.4% that it previously projected.


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