The 5 Thematic ETFs Beating the S 500 — and 388 That Aren't
Thematic ETFs are having their biggest year ever. The category now spans 393 U.S.-listed funds managing more than $256 billion in assets, up from $193 billion as recently as March. Launches are running at a record pace — Corgi alone listed 34 funds in a single day on May 6 — and one thematic ETF, the Roundhill Memory ETF (DRAM), has doubled in 40 trading days.
But thematic investing has always been a double-edged sword. The themes that generate the most excitement often generate the most disappointment when the hype fades. Understanding which 2026 themes are driven by durable structural trends — and which are momentum trades — matters more than picking the hottest ticker.
The DRAM Phenomenon
No thematic ETF has ever done what DRAM has done. Launched on April 2, the Roundhill Memory ETF surpassed $6.5 billion in assets faster than any ETF in history, according to Bloomberg’s Eric Balchunas. It is up approximately 107% year-to-date — roughly doubling in its first 40 trading sessions.
The fund is highly concentrated. Samsung Electronics, SK hynix, and Micron together represent roughly 70–75% of the portfolio. The thesis is straightforward: AI infrastructure requires enormous amounts of high-bandwidth memory, and a Goldman Sachs research report projects the global DRAM supply-demand gap will reach 4.9% in 2026, the most severe shortage in nearly 15 years.
DRAM is not a broad AI play. It is a targeted bet on a specific bottleneck in the AI supply chain — one that has been validated by global semiconductor sales hitting $298.5 billion in Q1 2026, up 79% year-over-year. Whether the fund can sustain this pace depends on whether the memory shortage persists as new fabrication capacity comes online in 2027 and 2028.
AI Remains the Dominant Theme
Artificial intelligence ETFs continue to command the largest share of thematic flows. The iShares A.I. Innovation And Tech Active ETF (BAI) and the Global X Artificial Intelligence & Technology ETF (AIQ) have attracted tens of billions in assets as investors seek broad exposure to the AI buildout across hardware, software, and services.
The category is evolving, though. Early AI ETFs were essentially repackaged tech funds. The 2026 vintage is more targeted. DRAM isolates memory. The VanEck Semiconductor ETF (SMH) captures the broader chip ecosystem. Corgi’s new lineup includes an AI cybersecurity fund and an AI infrastructure fund, each slicing the theme into narrower, more investable segments.
This fragmentation reflects a maturing market. Investors no longer want generic AI exposure — they want to bet on specific links in the chain. The risk is that narrow themes concentrate risk. A fund with 75% of its assets in three stocks, as DRAM has, is making a very specific wager.
Beyond AI: The Themes That Are Working
Nuclear energy has been the sleeper hit. The Range Nuclear Renaissance Index ETF (NUKZ) rose ~64% last year, more than doubling many AI-named funds. The thesis — that AI data centers need reliable baseload power, and nuclear is the only zero-carbon source that can deliver it at scale — has only strengthened as hyperscalers sign power purchase agreements with nuclear operators.
Infrastructure remains the category’s asset heavyweight. The Global X U.S. Infrastructure Development ETF (PAVE), iShares Global Infrastructure ETF (IGF), and First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund (GRID) collectively manage over $34 billion. Infrastructure is less flashy than AI memory chips, but it benefits from a multi-decade spending cycle driven by grid modernization, reshoring, and energy transition — trends that don’t disappear when sentiment shifts.
Space is emerging as the next frontier. At least three space-themed ETFs launched in Q1 2026, with six more in the pipeline ahead of a potential SpaceX IPO. Corgi’s launch included a Space & Satellite Communications ETF (DIPR). The category is early and speculative, but the addressable market — satellite broadband, launch services, space-based data — is real.
Defense and cybersecurity continue to attract steady flows amid elevated geopolitical tension. With the Strait of Hormuz effectively closed and global defense budgets rising, these themes have moved from tactical trades to structural allocations for many advisors.
The Corgi Effect
Corgi’s 34-fund launch on May 6 deserves its own mention. The AI fintech listed 28 actively managed thematic ETFs plus six buffer ETFs on Cboe BZX, raising $160 million on day one. Themes span quantum computing, genomics, Mag 7, robotics, energy infrastructure, and more, all at expense ratios between 0.20% and 0.35%.
The launch signals two things about the thematic ETF market. First, the barriers to entry have collapsed — an AI-native startup can now launch and distribute dozens of funds simultaneously. Second, the category is fragmenting into increasingly narrow slices. Whether that level of granularity serves investors or just creates noise is an open question.
How to Think About Thematic ETFs
The best thematic ETFs capture structural trends with long runways: infrastructure spending, energy transition, AI buildout, aging populations. The worst capture headlines that fade. The distinction usually comes down to time horizon.
A few practical filters for evaluating thematic funds: Does the theme have a multi-year spending cycle behind it, or is it a momentum trade? Is the fund diversified enough to survive a single-stock blowup, or is it concentrated in three names? And is the expense ratio justified — many thematic ETFs charge 0.50% or more for exposure that a broad sector fund delivers at a fraction of the cost.
With 393 thematic ETFs and counting, the hard part is no longer finding a theme. It is deciding which ones are worth the premium.