S&P 500 Hits Record 7,800 as Cooling PPI Fuels the AI Rally
On 13 August 2026, the S&P 500 touched an intraday record of 7,816.7 after July producer prices came in flat, easing fears of another Federal Reserve rate hike [1]. The index closed at a fresh record near 7,748.5, while the Nasdaq rose 0.54% to 26,588.49 [2][3]. AI hardware stocks led the charge — Micron gained more than 5% — but after-hours trading delivered a reality check for several AI names [1][3].
Story at a glance
What: a record high on cooling inflation
July's Producer Price Index (PPI) was flat month over month, below expectations, and slowed to 4.7% year over year from 5.5% in June [1]. Core PPI rose just 0.2% month over month [1]. The data followed an in-line July CPI of 3.4% year over year, keeping September rate-hike odds near 45% [2][3].
Why it matters: rates drive the AI trade
AI stocks are long-duration assets — their value sits in profits expected years from now. When rate-hike fears ease, those future profits are worth more today, so cooling inflation is rocket fuel for the AI trade [1][3].
Who: the winners and the check
The day belonged to AI hardware: SK Hynix rose 5.87%, SanDisk 5.58%, Micron 5.22%, Marvell 5.03%, and Intel 4.90% [1]. But after the close, Coherent fell more than 8% despite beating estimates — a sign investors now demand above-expectation growth [3].
When: the August data calendar
| Date | Release | Reading |
|---|---|---|
| 12 Aug 2026 | July CPI | 0.1% MoM, 3.4% YoY (in line) |
| 13 Aug 2026 | July PPI | Flat MoM, 4.7% YoY (cooling) |
| 15–16 Sep 2026 | FOMC meeting | Rate decision; hike odds ~45% |
Where: US equity markets
The rally was broad but tech-led, with the Nasdaq outperforming the Dow [1][2]. The S&P 500's record close of 7,748.5 came after an intraday peak of 7,816.7 [1][3].
Which: the numbers that matter
Index moves on 13 August
| Index | Move | Level |
|---|---|---|
| S&P 500 | +0.26% close (record) | 7,748.5 |
| S&P 500 intraday | +0.85% | 7,816.7 (record) |
| Nasdaq | +0.54% | 26,588.49 |
| Dow | −0.04% | 53,770.27 |
AI hardware leaders
| Stock | Gain |
|---|---|
| SK Hynix | +5.87% |
| SanDisk | +5.58% |
| Micron | +5.22% |
| Marvell | +5.03% |
| Intel | +4.90% |
How: inflation data moves AI valuations
Wholesale prices feed into consumer prices, and both feed into the Fed's rate path. When PPI cools, markets bet the Fed can hold rates steady — or even cut — which lowers the discount rate applied to future earnings [1][3]. That is why a flat PPI print can lift a trillion-dollar tech sector.
What next: the September decision
The historical parallel
This mirrors the 2024 AI rally, when cooling inflation and rate-cut hopes carried the S&P 500 to repeated records. It also echoes the September 2024 Fed pivot, when a 50-basis-point cut briefly spiked risk assets before they faded — the "buy the rumour, sell the news" pattern [3].
The future outlook
- Fed holds: With CPI in line and PPI cooling, a September hold is the base case; markets keep climbing [2][3].
- Fed hikes: A hot August inflation print would revive hike fears and hit high-multiple AI stocks hardest [3].
- Earnings reality check: After-hours moves like Coherent's 8% drop show investors now punish "good but not great" AI results [3].
What to watch: the September FOMC meeting, the next CPI and PPI prints, and whether AI earnings can keep beating raised expectations [1][3].
References
- TradingKey — S&P 500 hits record high of 7,800 as cooling US July PPI lifts risk appetite
- Anadolu Agency — US stocks end mostly higher after inflation data, AI shares rally
- HTX Insights — Market Trend (Aug 13): Nasdaq leads gain as CPI meets expectations
Disclaimer
Not financial advice. This content is for educational purposes only. Figures are as of 14 August 2026 and may be revised; markets move quickly. Always do your own research before making any investment decision.