SK hynix Joins SMH: What It Means for U.S. Semiconductor ETF Investors
If you already own SMH, you now own a piece of SK hynix without buying SKHY separately. That is the simplest way to understand the September index change.
SK hynix began trading its ADRs on Nasdaq in July 2026. Roughly two months later, the company entered the semiconductor index tracked by the VanEck Semiconductor ETF. As of September 22, SK hynix accounted for about 4.7% of SMH, representing roughly $3.5 billion of the fund's assets.
SK hynix ADR ticker: SKHY
Nasdaq trading began: July 10, 2026
SMH inclusion: September 2026 index review
SMH weight as of Sept. 22: about 4.7%
Why SK hynix entered SMH now
SMH tracks the MVIS US Listed Semiconductor 25 Index, which holds large and liquid semiconductor companies listed on U.S. exchanges. That group already included names such as Nvidia, TSMC, Broadcom, Micron and ASML.
SK hynix had been one of the biggest names missing from that universe because its primary shares trade in South Korea. The Nasdaq ADR listing changed the access point.
Each SK hynix American Depositary Share represents one-tenth of a Korean common share. U.S. investors can therefore trade SKHY in dollars through the Nasdaq market rather than buying the Korean-listed shares directly.
Once the ADR had enough U.S. market presence to meet the index rules, SK hynix became eligible for the September review. The index change was implemented on September 18 and took effect for the following trading session.
What SK hynix adds to the ETF
SMH already had plenty of AI exposure. Nvidia provides the accelerators, TSMC manufactures advanced chips, and companies such as ASML and Applied Materials supply the equipment behind semiconductor production.
SK hynix adds something more specific: direct exposure to high-bandwidth memory, or HBM. HBM sits next to AI processors and moves large amounts of data at very high speed, making memory performance part of the AI computing bottleneck.
| SMH holding | Weight, Sept. 22 | Main exposure |
|---|---|---|
| Nvidia | 19.4% | AI accelerators |
| TSMC | 9.2% | Advanced foundry |
| Micron | 5.1% | Memory |
| SK hynix | 4.7% | HBM and memory |
For an SMH investor, this changes the mix inside the fund. The ETF no longer reaches SK hynix only indirectly through AI customers or equipment suppliers. It now holds the memory producer itself.
What investors should watch next
Index inclusion creates a new source of ownership because funds tracking the benchmark have to reflect its components. It does not, by itself, change how many HBM chips SK hynix sells or how much profit the company earns.
That makes three numbers more useful than the headline about ETF inclusion.
- SMH weight: whether SK hynix remains near its current position after prices and future index reviews change.
- SKHY trading activity: whether U.S. liquidity develops after the initial index-driven demand.
- HBM earnings: whether AI-memory demand continues to translate into revenue, margins and cash flow.
There is also a portfolio question for anyone considering SKHY separately. An investor who already owns SMH now has meaningful SK hynix exposure inside the ETF. Buying the ADR on top of that increases the portfolio's concentration in the same company.
The more lasting change is not that an ETF bought SK hynix on one rebalance date. It is that a Korean memory company that was once awkward for many U.S. investors to access now sits directly inside one of the largest U.S. semiconductor portfolios.
Data checked: September 23, 2026.
ETF holdings and weights change with market prices and index rebalancing. This article is for informational purposes and is not investment advice.
