The Philadelphia Semiconductor Index has risen approximately 32% since late March, marking its best six-week performance since 2000. This rally has been driven by a combination of surging memory chip prices, sustained explosive demand for artificial intelligence, and sector rotation inflows.
Memory chips have led the gains. Since the outbreak of the Iran conflict in late February, spot prices for DRAM and NAND flash memory chips have increased by about 25% and 18%, respectively. This has directly propelled share prices of Micron and SanDisk to rise roughly 45% and 60% over the six-week period. The memory chip industry has undergone a two-year inventory destocking cycle, with constrained supply-side capacity. Meanwhile, demand for high-bandwidth memory from AI servers is consuming significant capacity, widening the supply-demand gap and resulting in a more intense price hike cycle than anticipated.
AI demand remains the core narrative. Nvidia has gained about 35% over six weeks. The company is scheduled to report earnings later this month, with market expectations for its data center revenue to reach another record high. Broadcom has risen approximately 28%, and AMD is up about 25%. Despite strong performance from AI-related chips, analog and automotive chips have lagged. Texas Instruments and NXP Semiconductors have gained only around 10% to 12% over the same period, indicating that the recovery in industrial demand remains uneven.
Sector rotation is also at play. As the 10-year U.S. Treasury yield retreated from 4.5% to around 4.3%, investors have shifted back toward growth stocks. The chip sector, with its high-beta characteristics, often outperforms the broader market during periods of stable interest rate expectations. Data shows that approximately $12 billion has flowed into technology sector ETFs over the past six weeks, with a significant portion allocated to semiconductors.
Despite the substantial index gains, market breadth remains narrow. Among the 30 components of the Philadelphia Semiconductor Index, only 10 have outperformed the index. Nvidia, Micron, and SanDisk alone have contributed to 60% of the index's gains. Historically, such narrow breadth often signals that a rally is entering its later stages. The current momentum is reminiscent of the situation in March 2000, where any catalyst could trigger a swift pullback.
The forward price-to-earnings ratio for the chip sector has expanded from 22 times six weeks ago to 28 times. During the first-quarter earnings season, over 80% of chip companies reported results exceeding expectations, with realized profit growth partly supporting the valuation expansion. However, as the P/E ratio approaches 30 times, the market's tolerance for disappointing results will be very low.
In Friday's late trading, the Philadelphia Semiconductor Index rose about 1%, trading near 5,200 points. Year-to-date, the index has gained approximately 18%, significantly outperforming the S&P 500's roughly 9% increase. Analyst views on the chip sector are increasingly diverging. Optimists believe the AI capital expenditure cycle will continue through 2027, driving further profit growth. Pessimists argue that valuations have already fully priced in the positive factors, and any signs of demand slowdown could trigger a sharp correction. Investors are closely monitoring Nvidia's June earnings report and memory chip price trends to assess whether the current rally can be sustained.