Recently, I’ve been looking into the memory sector and found that many people don’t understand why some semiconductor companies are extremely volatile while others remain quite stable. The key lies in the completely different roles that memory concept stocks play within the industry chain.

The memory industry chain is roughly divided into three layers. The top layer consists of chip manufacturers, like Nanya Technology, Winbond, and Macronix, which directly produce DRAM or Flash. When market prices rise, they have the greatest profit flexibility, but also the most volatility. The middle layer includes control IC and module manufacturers, such as Phison and Adata, responsible for processing chips into SSDs or managing read/write operations. Their profits are more stable, with a moat built on software integration. The topmost layer comprises global giants like Micron, Samsung, and SK Hynix, which control the global market pricing power.

The investment logic for these three layers is completely different. If you want to profit from price differences, focus on chip manufacturers. For more stability, choose module makers. For long-term trend investing, consider the major US stocks.

Speaking of US memory concept stocks, Micron Technology is currently the most watched. It is the only US company that produces both DRAM and NAND at the same time. As HBM capacity continues to expand, memory prices are entering an upcycle, and overall profits are clearly recovering. SK Hynix is a leader in the HBM market; HBM3e and HBM4 have already entered mass production, directly benefiting from AI computing power explosions. Kioxia, originally Toshiba’s memory division, has seen explosive demand for NAND Flash recently, with its market cap jumping from 43rd to 10th place globally within half a year. This shift is very noteworthy.

In Taiwan stocks, Nanya Technology is the purest DRAM stock, with customized AI memory already contributing to revenue. Winbond focuses on niche DRAM and NOR Flash, with deployments in consumer, industrial, and automotive fields, avoiding the price wars common in general-purpose DRAM. Phison is the company with the highest purity in NAND Flash; currently, NAND supply shortages are close to 20%. AI inference drives nearly unlimited data storage needs, and in the short term, the supply-demand imbalance is unlikely to change.

The memory industry has an eternal cycle: shortage → capacity expansion → oversupply → price collapse → cutback → shortage again. This cycle repeats every few years. Nomura Securities’ latest forecast shows that in Q2 2026, DRAM and NAND prices will increase by 51% and 50% quarter-over-quarter, respectively, significantly higher than previous estimates of 6% and 20%.

Why is the volatility so high? First, memory is a highly cyclical industry with extreme price sensitivity. Second, building a wafer fab costs hundreds of millions of dollars; if the timing of investment is wrong, the market may have already reversed by the time capacity comes online. Third, the global market is dominated by a few companies—Samsung, SK Hynix, and Micron together control over 94% of the global DRAM market, holding the pricing power.

Many people now ask when is the best time to buy memory concept stocks. My observation is that prices usually rebound when they stop falling and the market remains pessimistic, rather than waiting for prices to surge before entering. Look for three signals: spot DRAM prices stabilize, leading manufacturers announce capacity cuts, and inventory days decrease from high levels. Currently, global memory manufacturers’ inventories are at historic lows, with some major firms holding only about four weeks of stock, which is a direct reason why prices are easy to rise but hard to fall.

Memory stocks are not stable growth stocks but cyclical trading assets. You need to judge where the economic cycle currently stands, rather than seeking companies to hold forever. The memory stocks that plunged deeply last cycle became big winners this cycle due to AI supply gaps. The essence of memory stocks is: you profit from timing, not the company itself.

If you want to trade related US stocks flexibly on a swing basis, consider trading memory concept stocks via CFDs. This allows two-way trading without actual ownership, with lower transaction costs. Remember to practice with a demo account first, get familiar with the operations, then start with small capital in real trading.

You can start today—open a demo account, and over the next few weeks, observe DRAM contract price trends, track the financial reports and capital expenditure plans of major memory manufacturers, and practice judging which phase of the memory cycle we are in. Once you have a clearer understanding of the cycle, consider trading with small real capital.