Memory Stocks are the semiconductor and storage companies behind the memory chips and drives that modern computing and AI depend on — DRAM, NAND flash, and hard-disk storage. This page ranks 5 of them by market capitalization. Together they are worth about $1.7T, roughly 1.74% of the total market capitalization tracked on MarketCapLens. Figures update daily; as of July 14, 2026.
of tracked total
+1,094.39%
| 1 | Micron Technology, Inc.MU | $1.06T | -4.32% | +689.98% | +1,094.39% | +1,099.71% |
| 2 | Sandisk CorporationSNDK | $247.9B | -12.63% | +3,840.61% | — | — |
| 3 | Seagate Technology Holdings plcSTX | $192.98B | -5.46% | +477.31% | +872.50% | +850.98% |
| 4 | Western Digital CorporationWDC | $191.49B | -4.64% | +730.05% | +949.20% | +1,067.66% |
| 5 | Silicon Motion Technology CorporationSIMO | $10.05B | -8.22% | +313.63% | +370.34% | +13.36% |
Click a column to sort. Returns are share-price changes (excluding dividends); 5-year cap growth is the change in market capitalization over the period. As of July 14, 2026.
How the group's combined market capitalization has grown, stacked by company so you can see each member's contribution to the total.
Each company's share price indexed to 100 at February 2025, so growth is directly comparable regardless of price. This is a shorter window than five years because a member listed recently.
Memory chips are largely commodities: prices swing with supply and demand, so revenue and margins can move sharply from one year to the next.
High-bandwidth memory (HBM) has become a key bottleneck for AI accelerators, adding a powerful new demand driver on top of the traditional PC, phone, and server cycles.
Leading-edge memory fabs cost tens of billions to build, so the industry is concentrated among a few large players and sensitive to their capacity decisions.
Memory Stocks are the semiconductor and storage companies behind the memory chips and drives that modern computing and AI depend on — DRAM, NAND flash, and hard-disk storage. This page tracks Micron Technology, Inc., Sandisk Corporation, Seagate Technology Holdings plc, Western Digital Corporation, and Silicon Motion Technology Corporation. Together they are worth about $1.7T, roughly 1.7% of the total market capitalization tracked on this site.
The list covers Micron Technology, Inc. (MU), Sandisk Corporation (SNDK), Seagate Technology Holdings plc (STX), Western Digital Corporation (WDC), and Silicon Motion Technology Corporation (SIMO).
As of 2026-07-14, they have a combined market capitalization of about $1.7T — around 1.7% of the total market cap tracked here.
Over the past five years, Micron Technology, Inc. (MU) has been the strongest performer on this list, with a five-year share-price return of about +1,094.39%.
The largest US-listed memory and storage companies by market cap are shown in the table above, led by Micron (MU). What counts as 'best' depends on your own goals and risk tolerance — this is a research tool, not investment advice.
They are two of the world's largest memory makers, but Samsung is not listed in the US, and SK Hynix only recently listed US ADRs (in July 2026) without the multi-year trading history these market-cap and return comparisons rely on.
Led by Micron Technology, Inc. (MU). Data is for informational purposes only and is not investment advice. See our disclaimer.