Key Points
- The Roundhill Memory ETF (DRAM) gives investors exposure to memory-chip stocks, which have benefited from rising demand tied to data-center expansion.
- The newly launched ETF attracted significant investor interest, accounting for roughly 17% of all inflows into U.S. stock ETFs last week.
- Because the ETF is concentrated in a narrow semiconductor niche and holds just nine positions, it carries elevated risk for investors.
A newly launched exchange-traded fund (“ETF”) has captured 17% of all U.S stock ETF inflows during the week ending Friday, May 8, according to FactSet data. The Roundhill Memory ETF (DRAM) is a high-risk, high-reward play for investors to ride the wave of money gushing into semiconductor memory stocks.
It’s hard to find a hotter industry over the past year than memory. Not even artificial intelligence (“AI”) matches the record put up by these white-hot chipmakers. The actively managed Roundhill Memory ETF captures some of the fastest-rising stocks, such as Sandisk (SNDK), Micron Technology (MU), and SK hynix.
Just how fast are they rising? A year ago, Micron was trading below $100 a share. The stock has since zoomed to nearly $800. It’s even more extreme with Sandisk, which spun off from Western Digital in early 2025. It debuted at less than $40 per share and recently eclipsed $1,500.
It’s heady stuff, as the demands of the burgeoning AI industry put pressure on all parts of the supply chain. The builders of AI data centers, including hyperscalers such as Microsoft (MSFT) and Amazon (AMZN), are snapping up all the memory they can get to power their AI workhorse computers. So, investors have sent stocks soaring in anticipation of rising profits in memory chips.
Even with the huge inflows at the start of May, the Memory ETF has just $6.7 billion in assets under management, as of May 11. The fund charges a 0.65% expense ratio, meaning investors pay $65 annually for every $10,000 invested in the fund. While that’s on the higher side, it’s not outrageous, especially as investors rush for immediate exposure to the sector.
For traders looking to wager on the ongoing melt-up in memory stocks, the Roundhill Memory ETF is a quick and convenient way to do so – without having to pick individual stocks. If memory stocks continue to smolder, this ETF will remain a good way to capture that outperformance.
Now, let’s take a closer look at exactly what the Memory ETF owns, as well as the main risks investors should consider.
Roundhill Memory ETF: What Stocks Does the Fund Hold?
The Roundhill Memory ETF is narrowly focused on the semiconductor memory sub-sector of the market. Its portfolio ends up being highly concentrated in just a few stock positions.
| Stock | Weighting* |
| SK hynix | 27.4% |
| Micron Technology | 27.2% |
| Samsung Electronics | 20.2% |
| Sandisk | 5.5% |
| Kioxia Holdings | 5.5% |
| Seagate Technology (STX) | 4.7% |
| Western Digital (WDC) | 4.2% |
| Nanya Technology | 2.7% |
| Windbond Electronics | 1.4% |
That’s the complete range of the fund’s stock positions, which don’t even fill out the typical Top 10 holdings provided on brokers’ sites for funds. More than 54% of its assets are concentrated in the top two positions, and nearly three-quarters are in just the top three stocks. A handful of other smaller positions round out the remainder of the fund’s nine total stock holdings.
3 Key Risks of the Roundhill Memory ETF
It’s important to understand the risks of any potential investment. While ETFs are a convenient way to invest, they aren’t all equally safe as investments.
Here are some key risks to watch for before investing in the Memory ETF.
1. Extreme Sector Concentration
This fund is concentrated in just one sector (really a sub-sector): semiconductor memory. While many funds are narrowly diversified – that is, they invest only in a specific industry – the industry usually comprises more than just the handful of stocks in the memory sub-sector. If the industry dynamics or trading action changes for memory stocks, this concentrated fund can be expected to feel the full force of it.
2. Extreme Stock Concentration
Even within its sub-industry, this fund is highly concentrated, with just nine stock positions, as of May 11. Strikingly, the two largest positions comprise more than half of the fund’s total assets. Even in the best semiconductor ETFs, funds typically hold at least 25 to 30 individual stock positions, helping diversify their exposure and reduce the risk that any position could hurt the portfolio much.
3. Potential of Buying at or Near the Top
One of the things the ETF industry does best is launching new funds to capture the trends of the day, such as with memory stocks. However, this means that this year’s hot fund may become next year’s cold leftovers. Memory stocks have already seen utterly massive runs, raising the chances they’re overvalued. While the fund’s stocks have performed exceptionally well of late, it doesn’t mean they will continue to do so.
What Investors Need to Know
The Memory ETF is a great example of a fund that’s likely to be a huge winner until it isn’t. The fund may continue racing higher as investors pile into memory stocks, but it’s likely to deflate just as quickly when the hot money moves elsewhere.
So, investors in this kind of fund need to be particularly aware of what they’re investing in and how quickly the market could turn. The extreme concentration of stocks, which could all move in the same direction at once, makes this fund a better play for short-term traders.
Investors looking for longer-term, buy-and-hold investments can turn to the best ETFs, which offer broader diversification across dozens, if not hundreds, of stocks, reducing your risk.
Regards,
James Royal, Ph.D.
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