Global equity indices have reached new highs, but the rally rests on an unusually narrow base, according to FTSE Russell's June 2026 Asset Allocation Insights report. Since the April market trough, fewer than 15 stocks accounted for more than half of the total return of the FTSE All-World Index. When the broader technology sector is included, that share climbs to 75%, prompting the report's authors to describe market leadership as "very narrow."
The primary beneficiaries are what the report calls the "picks and shovels" of artificial intelligence—hardware-focused firms in semiconductors and memory chips, rather than software providers. This distinction has created a roughly 50-percentage-point year-to-date performance spread within the FTSE All-World Technology industry, underscoring the market's intense focus on AI infrastructure.
Capital spending on AI by hyperscale cloud providers is projected to grow more than 50% year over year in 2026, reaching over $600 billion, and to exceed $900 billion by 2028. This investment is propping up broader economic activity even as consumer spending remains subdued and other growth indicators soften. Advisors may want to consider how this concentration risk affects client portfolios, particularly in light of record IRA assets that are increasingly exposed to equity market swings.
Diversification Under Pressure
The report's most significant finding for portfolio construction may be the shift in asset-class correlations. The rolling 52-week correlation between equity and bond returns has risen to +0.44, compared with a 10-year average of -0.2. This reduces the cushioning effect bonds have traditionally provided in balanced portfolios, a development that could challenge conventional 60/40 allocation strategies.
Within fixed income, the relationship between nominal and inflation-linked bonds has also tightened to +0.88, limiting the inflation-protection benefit that linkers typically offer. Despite these headwinds, the report notes that government bond yields appear attractive relative to history, while corporate credit spreads remain near 10-year lows, leaving little room for further compression.
Equity valuations have moderated from extreme levels earlier in the year, but the report flags that the signal looks "extreme" for U.S. stocks when forward earnings yields are compared with the 10-year Treasury yield. This valuation gap may warrant caution, especially as home equity withdrawals hit a Q1 record, suggesting households are tapping other sources of wealth.
Emerging Market Reshuffle
Clients with emerging market exposure should note a structural shift: Taiwan has overtaken China as the largest constituent of the FTSE Emerging Index. Taiwan's weighting has surged from roughly 19% a year ago to about 33%, driven by gains in TSMC and MediaTek. TSMC alone now represents close to 17% of the index, a level of single-stock concentration that advisors may want to flag when discussing EM allocations.
Energy security, stemming from disruption around the Strait of Hormuz, is another theme running through the report. The FTSE Environmental Opportunities Index has risen 21.6% year to date as the conflict accelerates interest in alternative energy sources. This trend could intersect with longevity-driven luxury real estate demand, as affluent clients seek to diversify into tangible assets.
Overall, the report paints a picture of a market that is climbing on a narrow set of AI-related bets while traditional portfolio hedges lose effectiveness. Advisors may need to reassess diversification strategies and consider the implications of concentrated index weightings, both in domestic equities and emerging markets.
