The main portfolio question is no longer whether thematic ETFs belong at all, but where they sit. Once a theme is carved out as a sleeve, it changes the job of the rest of the portfolio: the core has to do more of the heavy lifting on diversification, while the theme is allowed to be narrower, more cyclical, and more sensitive to investor sentiment.
That distinction matters because thematic ETFs are usually built around a story, not a broad market benchmark. The more specific the theme, the greater the chance that a small number of stocks, subsectors, or business models drive results. For long-term investors, the key issue is not simply exposure to a trend, but understanding how much single-theme concentration can be tolerated alongside existing equity, sector, and factor holdings.
Implementation also deserves attention. A thematic sleeve is often best treated as something to review and rebalance deliberately rather than to add to impulsively after headlines. If the position grows well above its intended range, it can begin to dominate risk even when it still looks modest in dollar terms. If the theme disappoints, disciplined sizing can help keep the portfolio plan intact.
For ETF investors, the practical takeaway is structural. Thematic funds can be useful tools when they are matched to a clear purpose: a satellite allocation, a long-horizon conviction trade, or a complement to a broader sector holding. Their value comes less from novelty than from fit โ how they interact with the rest of the portfolio, and whether the investor can hold them through periods when the underlying trend is not in favor.
For years, thematic investing offered investors a different look at traditional growth exposure that included artificial intelligence (AI) and machine learning. While these themes have now become commonplace, time and evolution are creating a new crop of thematic opportunities in memory, robotics, and space exploration.
At a recent TMX VettaFi Midyear Symposium, a question was asked to advisors: โHow much exposure do you have to thematic strategies in your average client portfolio?โ
Key Takeaways:
See more: Procure Space ETF (UFO) Adds SpaceX Following Historic Debut
Thematic Portfolio Integration Rising
The poll results shouted a trend of rising integration. Nearly three-quarters (73%) of respondents now maintain a dedicated allocation to thematic strategies within their average client portfolios. While the bulk sits within the more pragmatic 1% to 5% satellite allocation, nearly 30% of advisors have expanded their thematic footprint to more than 6% of the overall asset mix.
| Average Client Portfolio Exposure | % of Responses |
|---|---|
| 0% (No exposure) | 26.9% |
| 1% โ 5% (Core satellite/tactical) | 44.8% |
| 6% โ 10% (Meaningful structural tilt) | 19.4% |
| More than 10% (High-conviction allocation) | 9% |
One answered question begets another: whatโs driving this adoption? It appears advisors are now moving away from broad, generic tech buckets of the past and towards targeted mega-trends. Three distinct themes have captured significant interest: memory, robotics, and space exploration. All three themes are encapsulated in the ETFs below.
DRAM: If Memory Serves Correct
Itโs difficult to have software-driven AI without the physical hardware required to store and process data. With that, the Roundhill Memory ETF (DRAM) has captured intense advisor attention as a pure-play vector into the hardware stack. Itโs also captured plenty of capital with over $18 billion in net flows since its inception just under three months ago.
As the buildout of AI infrastructure accelerates, high-performance memory could emerge as a critical technological bottleneck with demand outpacing supply. While much of the buildout is focused on semiconductors, DRAM is the first ETF specifically targeting global memory and storage companies. From a thematic allocation perspective, DRAM gives investors targeted exposure to AI-driven demand for faster data processing and storage.
ROBO: The Automated Reality
Another interesting topic the Symposium covered was Robotics as a fast-emerging theme. Zeno Mercer, senior research analyst at VettaFi, lead the discussion and shared his expertise Once a niche segment of alternative industrial tech, robotics has evolved into a mainstream necessity. Driven by the changing needs of the global economy, this demand will only continue to grow. Given this, an ideal fund to consider for exposure to this thematic opportunity is the ROBO Global Robotics and Automation Index ETF (ROBO).
Labor shortages, global nearshoring initiatives, and manufacturing efficiency demands have transformed robotics from a futuristic concept into a necessity. With about $2 billion in assets and growing, ROBO captures the global supply chain of automation from computational sensing to manufacturing logistics. This thematic tilt can work in tandem with a traditional industrial allocation to provide comprehensive growth exposure to a portfolio.
UFO: Beyond Otherworldly Allocation
Of course, the investing world has been abuzz with SpaceX. However, the space exploration theme goes beyond launching rockets. From a more macro perspective, the long-term secular trend in the orbital economy can be captured with the Procure Space ETF (UFO).
UFO offers pure-play exposure to the commercialization of space, tracking satellite operators, hardware manufacturers, and space communications infrastructure. Space is no longer exclusively a government endeavor. Itโs become a foundational component in global defense strategy, data collection, and connectivity networks. While SpaceX is a prominent feature in the fundโs top 10 holdings, other companies like Trimble, Garmin, and Sirius XM add to this diversified fund. As commercial interest in the space economy grows, UFO stands ready to capture it.
Implementing the Thematic Sleeve
As the poll results from the symposium show, a discussion on thematic allocation has shifted from โshould I allocateโ to โhow much should I allocate?โ Whether itโs using a thematic allocation to take advantage of themes like memory via DRAM, robotics via ROBO, and the space economy via UFO, investors have greater optionality.
In this new era of modern investing, thematic tools are no longer speculative bets, but precise instruments for long-term growth.
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