ETFThemes.com 2026 First Half Review and Outlook: AI Bottlenecks Take Over the Thematic Tape

The first half of 2026 confirmed that thematic investors are no longer simply buying “AI” as a broad concept. They are buying the bottlenecks: memory, semiconductor manufacturing, photonics, power infrastructure, grid equipment, and space-based connectivity. The ETFThemes.com return and flow database through July 1, 2026 shows that leadership narrowed around semiconductor and AI-infrastructure exposures, while more speculative internet, China internet, crypto-adjacent, gaming, cannabis, and precious-metal exposures lagged.

This is consistent with the broader ETF market backdrop. U.S.-listed ETFs attracted more than $1 trillion in first-half inflows, with AI and technology-related exposures a major driver of the year’s demand. MarketWatch reported that technology ETFs captured roughly 69% of sector ETF flows, while the Roundhill Memory ETF (DRAM) emerged as the standout new launch, attracting nearly $20 billion and rising 166% after its April debut.

First-Half Performance: Semiconductors Were the Thematic Market

The 7/1 ETFThemes.com dataset shows a decisive first-half hierarchy. Semiconductor ETFs dominated the performance leaderboard, with PSI, FTXL, SOXX, SOXQ, XSD, SMH, and SHOC all among the strongest performers. The outperformance was not just a generic “tech” rally; it was a hardware and AI-infrastructure rally. Investors paid up for the companies enabling compute, memory, power delivery, and data movement.

Source: ETFThemes.com Return and Flow Database, July 1, 2026. 6M return used as first-half performance proxy.

The bottom of the table tells the other side of the story. China internet, internet/metaverse, gaming, cannabis, fintech innovation, and precious metals were under pressure. That suggests investors were not rewarding all “growth” equally. They were willing to chase expensive growth where near-term revenue visibility was improving, but they punished themes with weaker earnings visibility, geopolitical sensitivity, or stale post-2020 narratives.

First-Half Flows: Investors Bought Semis, Grid, Momentum, and Dividend Anchors

Flows were more nuanced than performance. The largest ETFThemes.com universe inflows went to a mix of broad allocation vehicles, dividend strategies, semiconductors, momentum, and electrification. That matters because it shows investors were not simply chasing the highest-return themes. They were pairing AI-infrastructure upside with more durable, cash-flow-oriented exposures.

The largest outflows were concentrated in precious metals, EAFE value, internet, low-volatility, and legacy disruption. Some of this likely reflects profit-taking and factor rotation. But the deeper message is that investors were willing to sell defensive or stale allocations to fund exposures tied to AI capex, semiconductors, and grid infrastructure.

Product Innovation: The Top New ETFs of 2026

The new ETF launch calendar also reflected the market’s changing definition of “thematic.” The strongest new products were not broad innovation funds. They were targeted bottleneck funds: memory, photonics, space, Nvidia supply chain, and AI power infrastructure.

The bigger point is that 2026’s most successful launches are not just repackaged technology funds. They are increasingly precise exposures to the physical constraints of AI: memory, optical data movement, chip manufacturing, electricity, and specialized infrastructure. That is a healthier product-development signal than the 2020–2021 era of broad “innovation” ETFs, but it also raises concentration risk. These funds can be excellent expressions of a theme and still be highly volatile, as the sharp drawdowns in memory stocks during June showed.

Outlook for the Second Half of 2026

The second half of 2026 should be less about whether AI is “real” and more about whether the AI infrastructure trade can continue to absorb higher expectations, higher input costs, and higher interest-rate sensitivity.

The macro backdrop remains constructive but not frictionless. The Federal Reserve’s June statement said economic activity was expanding at a solid pace, with strong productivity growth and capital investment, but it also emphasized that inflation remained above the Fed’s 2% goal. The BLS May CPI report showed headline CPI up 4.2% over the prior year, core CPI up 2.9%, and energy prices up 23.5%, which keeps the rate backdrop important for long-duration thematic equities.

For thematic investors, the most important second-half question is whether AI capex translates into enough revenue visibility to support the size of the rally. The most compelling evidence still favors the picks-and-shovels side. The Semiconductor Industry Association and Deloitte estimated that chips account for more than 95% of the content value of a leading AI server rack and more than 50% of total AI data-center capex, with AI data-center semiconductor revenue potentially reaching $1.2 trillion by 2028. That supports continued attention on semiconductors, memory, photonics, power equipment, grid infrastructure, and advanced manufacturing.

Power is the other key constraint. The IEA expects global electricity demand growth to accelerate to an average 3.6% annually from 2026–2030, with data centers, heat pumps, and cooling contributing to rising buildings-sector electricity demand. That should keep AI power infrastructure, electrification, nuclear, grid modernization, and data-center supply-chain ETFs relevant even if the hottest chip exposures consolidate.

For the second half, investors should watch five things:

1. Memory pricing and supply discipline. DRAM and HBM strength has become the clearest expression of AI scarcity. Sustained pricing power would support DRAM/DISK-style exposures; capacity overbuild fears would pressure them quickly.
2. Optical and photonics adoption. EUV and LAZR reflect a broader shift toward data-movement bottlenecks. If AI clusters keep scaling, optical connectivity may remain one of the best second-derivative trades.
3. Power availability and utility interconnection constraints. GRID, POWR, VOLT, AIPO, and TCAI benefit if AI infrastructure moves from chip scarcity to electricity scarcity.
4. Rate sensitivity. A higher-for-longer inflation backdrop could challenge long-duration software and speculative innovation funds while favoring themes tied to visible capex, real assets, and cash-flowing infrastructure.
5. Rotation risk inside AI. The first half rewarded hardware and infrastructure more than software. A second-half broadening would require clearer signs of AI monetization by enterprise software, cloud, advertising, cybersecurity, and automation companies.

The most attractive second-half setup is not necessarily “buy the winners blindly.” It is to stay focused on the parts of the thematic market where flows, fundamentals, and capex visibility align. In the current tape, that still points to semiconductors, AI infrastructure, electrification, grid modernization, and select space infrastructure. The biggest risks are crowding, valuation, policy shocks, and the possibility that investors begin demanding proof of AI profitability rather than simply rewarding AI capacity growth.

Bottom line: The first half of 2026 was the year thematic investing moved from broad innovation stories to bottleneck-specific ETFs. The second half will test whether those bottlenecks remain scarce enough, profitable enough, and investable enough to sustain the flow of capital.

Sources

• ETFThemes.com Return and Flow Database, July 1, 2026, used for thematic ETF performance, AUM, YTD flows, 1M flows, top performers, bottom performers, inflow leaders, and outflow leaders.
• MarketWatch, first-half 2026 ETF flow review, for record ETF inflows, technology ETF demand, and DRAM’s nearly $20B inflow / ~166% post-launch surge.
• Roundhill Investments, DRAM fund page, for the fund’s memory-chip mandate and “first-ever memory stock ETF” positioning.
• Tema ETFs, NASA fund page, for inception date, AUM, holdings, and SpaceX exposure.
• ETF.com, NASA space ETF coverage, for NASA becoming the largest space ETF and SpaceX IPO demand context.
• Reuters, space ETF demand around the SpaceX IPO, for broader space ETF asset-gathering and product-launch context.
• PR Newswire / Corgi Funds, EUV launch milestone, for the fund surpassing $150M AUM within two weeks of launch.
• Tema ETFs, DISK and LAZR launch announcement, for the new memory and photonics ETF descriptions.
• Federal Reserve, June 17, 2026 FOMC statement, for the macro backdrop of solid activity, strong capital investment, and elevated inflation.
• Bureau of Labor Statistics, May 2026 CPI release, for headline CPI, core CPI, and energy inflation data.
• International Energy Agency, Electricity 2026, for global electricity demand growth and data-center demand pressure.
• Semiconductor Industry Association / Deloitte, AI data-center semiconductor report, for chip content value, AI data-center capex exposure, and the $1.2T 2028 revenue projection.
• MarketWatch, DRAM selloff coverage, for the volatility and crowding risk around memory and AI hardware ETFs.

Disclaimer:  This material is for informational and educational purposes only and should not be construed as investment advice, a recommendation, or an offer to buy or sell any security or investment product. ETF holdings, performance, flows, and assets under management may change materially over time. Thematic ETFs can involve elevated concentration, valuation, liquidity, volatility, sector, regulatory, and geopolitical risks. Past performance is not indicative of future results. Investors should conduct their own due diligence and consult a qualified financial professional before making investment decisions.