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William Blair’s August 2026 view is that market leadership is shifting away from AI-related technology and infrastructure toward a wider mix of industries and countries—not that AI is finished or that the market has entered a downturn. The firm says that makes company-level selection more important, while its cited returns show how sharply outcomes differed by region and market segment over specific periods.
What William Blair means by a market that is broadening
In “A Market in Transition,” published August 27, 2026, William Blair Investment Management’s Olga Bitel and Alexa Davis describe resilient markets alongside a change in what was driving returns. Technology contributed most of the S&P 500’s aggregate returns in April and May, then detracted materially in June and July as other sectors partly offset the decline. That account is about changing leadership beneath index-level performance; it does not establish that every AI-linked company fell or that the entire S&P 500 was flat.
The authors’ central point is that more industries and countries were participating as AI-related technology and infrastructure lost momentum. They call the resulting environment “a classic stockpickers’ market”: with no clear sector leader, differences among companies matter more. It is an assessment of conditions in their August commentary, not a promise that broad participation will continue. Read William Blair’s August 27, 2026 commentary.
What the cited returns show—and when they apply
William Blair’s article reports the following historical returns, drawing on FactSet and its own analysis. Each figure refers to the period shown, not returns through October 2026.
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| Exposure | Q2 2026 | Q3 2026 through August 19 |
|---|---|---|
| U.S. all-cap equities | 15.7% | 2.6% |
| Emerging-market equities | 22.8% | −2.5% |
| Developed-market equities outside the United States | 14.0% | 2.0% |
| Global small-cap equities | 15.1% | Not stated for this period by William Blair |
| U.S. value equities | Not stated for this period by William Blair | 5.8% |
The Q2 figures show emerging markets and global small caps ahead of U.S. all-cap equities for that quarter. The partial Q3 figures tell a different story: emerging markets were down through August 19 while U.S. value was up. These are returns for distinct benchmarks and windows, not a like-for-like forecast or evidence that one exposure will keep leading.
William Blair said the Q3 emerging-market decline was affected by rotation in South Korean and Taiwanese companies associated with the AI technology and infrastructure buildout. This helps explain why a broad regional category can weaken even while the authors describe participation widening elsewhere.
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Why leadership may be changing
William Blair links the rotation to economic growth and shifting leadership, rather than treating it as a signal that investors necessarily expect recession. In its August assessment, the firm pointed to improving supply- and demand-side indicators, including manufacturing purchasing managers’ indexes, auto sales, and inflation-adjusted retail sales. It characterized economic data as generally surprising to the upside in the United States, euro area, and Japan, while China and Latin America disappointed relative to expectations and emerging-market Asia lost some momentum. These are the authors’ interpretations of conditions at the time.
Inflation and supply costs
The authors identified energy prices, semiconductor prices, and tariffs as sources of potential inflation volatility. They said memory-chip supply constraints were putting pressure on goods costs, while some pressure on South Korean memory-chip export prices might be easing. A separate William Blair article reported South Korean memory-chip prices up about 250% year over year and 50% quarter over quarter in its May 2026 data context; those unusually large changes refer to that historical period, not current prices. See William Blair’s July 15, 2026 AI analysis.
Tariffs and interest rates
William Blair also expected changes in U.S. tariff policy to continue, including through mechanisms such as Section 301. That was an August 2026 outlook, not a statement that policy has remained unchanged.
The firm connected higher government-bond yields to growing demand for capital as investment expands in physical infrastructure, manufacturing, energy, defense, and other tangible assets. It argued that higher rates do not necessarily mean debt dynamics are worsening if nominal GDP grows faster than nominal borrowing costs. As a historical example, the article said Japan’s government debt-to-GDP ratio fell 10% after peaking in 2022 while 10-year yields rose nearly 200 basis points from 2022 through 2025. This example supports the authors’ argument; it is not a general assurance about debt sustainability.
How this differs from saying the AI trade is over
Bitel’s July 2026 analysis separates near-term suppliers from the longer-term search for businesses that can turn AI into lasting value. She said AI infrastructure had driven equity-market gains for more than a year and that rising chip prices and capacity expansion were shifting near-term leadership toward semiconductor-equipment companies. The next question, in her view, is what companies build with AI and whether adoption improves efficiency or generates revenue. She described leading language models as “good enough” for some applications and noted declining token prices as of that July discussion. Neither point identifies which application businesses will ultimately succeed.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallBitel’s March 2026 article placed the shift in a wider capital-expenditure thesis: data centers, semiconductors, cooling, power, defense, energy, and supply chains are physical investments that could spread growth across sectors and regions. It described broader leadership in 2025 continuing into early 2026, with emerging and some developed markets outperforming the United States. That earlier perspective provides context for the structural thesis, but it should not be confused with the August article’s more recent quarterly figures. Read the March 3, 2026 market commentary.
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What investors can—and cannot—take from the argument
A broadening market is a description of where returns and participation are coming from, not a recommendation to sell AI holdings or buy a particular region, sector, or stock. William Blair’s commentary does not say every investor should make the same change. The firm also cautions that its information is not a recommendation to buy or sell shares, that its strategies may not suit every investor, that indexes are unmanaged and cannot be invested in directly, and that past performance does not indicate future returns.
For readers assessing the claim, keep comparisons aligned: separate U.S., non-U.S. developed, and emerging-market exposures; distinguish company size and style from sector; and do not mix Q2 returns with Q3-to-date figures or a forward-looking investment thesis. The reported numbers describe the past; the question of which firms will convert AI investment into durable earnings remains open.
Kiplinger also summarized Bitel and Davis’s transition view, with its own data reported through August 31, 2026. Its coverage emphasizes that leadership shifts can be gradual and that allocation should remain consistent with an investor’s goals, time horizon, and risk tolerance. Read Kiplinger’s related coverage.
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