The S&P 500’s march to new highs continues to command investor attention, but beneath the surface, market participation is showing signs of strain that wealth advisors and RIAs should not ignore.
Recent technical data suggests the current rally may be narrower than headline index levels imply. On Friday, the S&P 500 closed 7.7% above its 50-day moving average, while only 52% of index constituents finished above their own 50-day moving averages, according to BTIG strategist Jonathan Krinsky. Over the past three decades, the benchmark index has never traded more than 7% above its 50-day moving average with fewer than 55% of underlying stocks participating in the advance.
That divergence points to a market increasingly dependent on a concentrated group of mega-cap technology and semiconductor names rather than broad-based equity strength.
Additional market internals reinforce the concern. Friday marked only the third occurrence since 1990 in which the S&P 500 recorded more new 52-week lows than highs while the index itself simultaneously reached a new high. Historically, this type of deterioration in breadth has often preceded periods of increased volatility or short-term consolidation.
Krinsky noted that investor focus may need to shift away from simply debating whether the semiconductor rally is justified. Instead, the more pressing question may be why the broader market continues to lag while a relatively small cohort of AI-related equities drives index performance.
As semiconductor and AI-linked stocks continue extending gains, the sustainability of such concentration risk is becoming increasingly relevant for portfolio managers. Leadership from technology stocks is not inherently problematic when accompanied by healthy participation across sectors. However, the current environment appears materially different. Semiconductor equities are accelerating sharply higher while many non-technology sectors remain rangebound or continue to weaken.
For advisors overseeing diversified client portfolios, this distinction matters. Narrow market leadership can create the illusion of broad market strength even as underlying participation deteriorates. In prior cycles, similar conditions have often resulted in either a delayed broadening of the rally or a “catch-down” scenario in which leading sectors retrace toward weaker market internals rather than lagging sectors catching up.
To be clear, the fundamental backdrop supporting equities remains constructive. The market’s advance has been underpinned by a combination of resilient earnings growth, stable labor conditions, and improving geopolitical sentiment.
Corporate earnings season has been particularly strong. Approximately 84% of S&P 500 companies have exceeded analyst profit expectations, representing the strongest beat rate since 2021. Large-cap companies, especially within technology and communications services, continue to demonstrate operating leverage and strong margin resilience despite elevated interest rates and lingering inflationary pressures.
The labor market has also remained firmer than many economists anticipated. April employment data showed the U.S. economy added 115,000 jobs, reinforcing the narrative that economic activity remains intact despite restrictive monetary policy and higher input costs. For investors, continued labor market stability reduces immediate recession concerns and supports expectations for ongoing consumer spending.
At the same time, easing geopolitical tensions have helped improve investor sentiment. Markets have become increasingly comfortable with the view that inflation shocks tied to Middle East instability may prove manageable rather than structurally disruptive. That moderation in macro risk has allowed investors to refocus on earnings growth and secular investment themes, most notably artificial intelligence.
The AI investment cycle remains the dominant force shaping equity market leadership. Massive capital expenditures tied to AI infrastructure, cloud computing, and data center expansion continue to fuel demand for semiconductors and advanced computing platforms. Industry estimates now place cumulative AI-related spending well above $700 billion, with hyperscalers and enterprise customers accelerating infrastructure deployments.
This spending wave has directly benefited semiconductor manufacturers and AI infrastructure providers. Companies such as NVDA and AMD remain central beneficiaries of the ongoing buildout, with investors rewarding firms positioned at the core of next-generation compute demand.
Importantly, the current enthusiasm differs from prior speculative technology cycles in several respects. Revenue growth tied to AI infrastructure has been tangible, particularly within data center businesses. Enterprise adoption trends, cloud demand, and productivity-enhancement initiatives provide measurable support for elevated spending forecasts. In other words, the rally is not being driven solely by narrative momentum; it is also being reinforced by accelerating revenue generation and improving cash flow dynamics.
Even so, concentration risk remains elevated. A relatively small number of mega-cap technology names continue to account for an outsized percentage of index gains. This creates both opportunity and vulnerability for advisors constructing client portfolios.
From an asset allocation perspective, the challenge is balancing participation in secular growth trends with prudent risk management. Underexposure to technology leadership has meaningfully hurt relative performance over the past 18 months. However, excessive concentration in a handful of high-momentum names can expose portfolios to sharp reversals should sentiment shift or earnings expectations moderate.
For RIAs, the current environment underscores the importance of distinguishing between index-level strength and underlying market health. Traditional capitalization-weighted benchmarks may continue reaching new highs even while a large portion of individual stocks underperform. As a result, advisors relying solely on benchmark performance may underestimate the degree of fragility developing beneath the surface.
Sector dispersion has become increasingly pronounced. Technology and semiconductor-related equities continue to attract capital flows, while cyclical and defensive sectors alike struggle to establish sustained momentum. Small-cap participation has also remained inconsistent, despite periodic expectations for broadening leadership.
This divergence raises several important considerations for advisors managing long-term client capital.
First, portfolio diversification may look different in today’s market than in previous cycles. Diversification across sectors alone may not sufficiently reduce concentration risk if market returns remain dominated by a narrow set of correlated growth exposures. Advisors may need to evaluate diversification through the lens of factor exposures, earnings sensitivity, and valuation concentration rather than traditional sector allocation alone.
Second, market breadth deserves closer monitoring as a leading indicator of potential volatility. Healthy bull markets generally expand over time, with broader participation supporting durability and reducing dependence on a handful of outperformers. Persistent deterioration in breadth can signal weakening risk appetite even when indexes continue climbing.
Third, advisors should prepare clients for the possibility of increased short-term volatility without necessarily abandoning longer-term constructive outlooks. Momentum-driven rallies often experience sharp rotations, particularly when positioning becomes crowded. Tactical pullbacks in leadership sectors may occur even if the secular AI investment thesis remains intact.
Valuation sensitivity also warrants attention. While many leading technology firms continue delivering exceptional growth, investor expectations have risen substantially alongside prices. Elevated expectations can compress the margin for error during earnings season, particularly if revenue guidance or margin trends begin normalizing.
At the same time, advisors should avoid framing the current environment solely through a bearish lens. Market concentration alone does not automatically signal an imminent reversal. Some of the strongest historical bull markets have experienced prolonged periods of narrow leadership before eventually broadening out. The key question is whether earnings growth and economic resilience remain strong enough to support continued expansion in participation.
In the near term, incoming economic data and corporate guidance will likely determine whether the rally broadens or becomes increasingly vulnerable to correction. Investors will continue watching inflation trends, labor market conditions, and Federal Reserve policy expectations closely. Any signs of economic deceleration or slowing AI-related capital expenditures could pressure the market’s highest-multiple leaders.
For wealth advisors, the current setup reinforces the importance of disciplined portfolio construction and proactive client communication. Clients naturally focus on headline index levels and record highs, but advisors must contextualize what is actually driving returns beneath the surface.
The distinction between broad-based market strength and concentrated leadership is especially relevant in periods where investor sentiment appears increasingly dependent on a small number of stocks. Understanding that dynamic can help advisors better manage expectations, maintain strategic discipline, and navigate potential volatility without overreacting to short-term market swings.
Ultimately, Krinsky’s observations deserve attention because they highlight a market dynamic that often emerges late in extended rallies: narrowing participation amid accelerating leadership concentration. Whether this signals a temporary pause before broader participation emerges or the early stages of a more meaningful rotation remains uncertain.
For now, the fundamentals supporting equities remain constructive, particularly within technology and AI infrastructure. However, the widening gap between index performance and underlying participation suggests advisors should remain attentive to market breadth, concentration risk, and the sustainability of current leadership trends as the second half of the year approaches.
