Compare chip, drive and controller businesses. 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 6 of them by market capitalization. Together they are worth about $2.92T, roughly 2.90% of tracked market cap on MarketCapLens. Figures update daily; as of October 12, 2026.
+1,367.48%
4 of 6 names, Oct 2021–Oct 2026. Young listings are omitted from this aggregate, not from current combined cap.
| 1 | SK hynix Inc.†SKHY | $1.2T | 41.12% | $169.03 | -0.86% | — | — | — |
| 2 | Micron Technology, Inc.MU | $1.16T | 39.83% | $1,029.00 | -0.66% | +435.02% | +1,367.48% | +1,381.91% |
| 3 | Sandisk CorporationSNDK | $234.25B | 8.03% | $1,581.82 | -1.72% | +1,119.79% | — | — |
| 4 | Seagate Technology Holdings plcSTX | $175.57B | 6.02% | $783.00 | +1.06% | +253.18% | +879.61% | +870.74% |
| 5 | Western Digital CorporationWDC | $136.94B | 4.69% | $397.28 | +1.01% | +231.90% | +829.09% | +927.36% |
| 6 | Silicon Motion Technology CorporationSIMO | $8.86B | 0.30% | $263.90 | +0.77% | +180.24% | +293.29% | -4.39% |
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. % of group is each company's share of this list's combined market cap. As of October 12, 2026. † Recently listed — too little price history yet, so these appear in the market-cap chart from their listing date and are omitted from the performance comparison.
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 bottleneck for AI accelerators, adding another 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 SK hynix Inc., Micron Technology, Inc., Sandisk Corporation, Seagate Technology Holdings plc, Western Digital Corporation, and Silicon Motion Technology Corporation. Together they are worth about $2.92T, roughly 2.9% of tracked market cap on this site.
The list covers SK hynix Inc. (SKHY), Micron Technology, Inc. (MU), Sandisk Corporation (SNDK), Seagate Technology Holdings plc (STX), Western Digital Corporation (WDC), and Silicon Motion Technology Corporation (SIMO).
As of 2026-10-12, they have a combined market capitalization of about $2.92T — around 2.9% of tracked market cap here.
Led by SK hynix Inc. (SKHY). Informational only; not investment advice. See our disclaimer.
Over the past five years, Micron Technology, Inc. (MU) has the largest share-price return on this list, about +1,367.48%. That is a dated price path, not a pick.
It uses 4 of 6 names present from Oct 2021 to Oct 2026. Newer listings stay in current combined cap and the stacked chart but are omitted from that aggregate.
The table orders U.S.-listed memory and storage companies by market cap. Largest is size, not best. This is a research ranking, not investment advice.
Samsung is one of the world's largest memory makers, but it is not listed in the US. SK hynix listed Nasdaq ADRs (SKHY) in July 2026 and is on the table; like Sandisk after its 2025 spin-off, its five-year return is blank until it has a full history. History affects the charts, not whether a US-listed name belongs here.