S&P 500 Record Close Led by Memory Chip Stock Rally

The S&P 500 closed at a record 7,798.99 on Thursday, August 13, and the drivers were about as clean as a market day gets: cooler inflation data on one side, a memory-chip rally on the other.

• S&P 500 notched a record closing high of 7,798.99 on August 13, 2026
• July producer prices came in unchanged, with goods falling and services up marginally
• Sandisk rose 13.7% and Micron gained 4.2% on the session
• Friday closed lower, but the index still posted a third straight weekly gain

What Pushed the Index to a Record?

Two things landed at once. The producer price index for July came in unchanged — goods prices fell, services ticked up marginally — which markets read as supporting the case that the Federal Reserve holds rates steady at its September meeting. Softer input-cost data tends to do more for risk appetite than almost any other scheduled release, and this one delivered.

The second driver was concentrated in memory. Sandisk jumped 13.7% and Micron added 4.2%, with the broader chip index climbing to a near one-month high. Microsoft added almost 1% and Meta Platforms rose 2.8%. A retreat in crude prices helped the tone as well.

Why Are Memory Stocks Leading Again?

This is the continuation of a theme rather than a new one. AI infrastructure buildouts consume high-bandwidth memory at a rate that has kept supply tight, and memory names have repeatedly been the sharpest movers on days when the AI trade catches a bid. We covered the same dynamic driving Micron and memory peers to record highs back in May, and the pattern has been durable.

The supporting data has cooperated. Semiconductor sales have posted an extended run of sequential monthly gains, and the equipment and test side of the industry has been reporting in line — Onto Innovation's record quarter earlier this month fit the same picture.

What Should Investors Watch Next?

The near-term calendar is unusually concentrated. Three of the largest AI infrastructure names report in the back half of August and early September, with Nvidia scheduled for August 26 and Marvell Technology following on August 27. Those prints will do more to set the tone for the sector than any single macro release between now and then.

One note on reading days like this: an index record driven by two memory names and a benign PPI print is a narrow rally, not a broad one. Friday's modest pullback — which still left the index with a third consecutive weekly gain — is a reasonable reminder that leadership this concentrated tends to move both directions. Our stock trading coverage will be tracking the late-August earnings wave as it lands.

Sources: CNBC — August 13, 2026; Bloomberg — August 13, 2026; Reuters via MarketScreener — August 13, 2026.