October was a month of stark contrasts beneath the surface of the stock market, defined by a sharp rotation away from mega-cap technology and a resurgence in traditional diversification. For much of the past two years, a handful of artificial intelligence and technology front-runners carried the major indices. In October, however, third-quarter earnings reports shifted Wall Street’s focus from the promise of AI revenue to the sheer cost of building it. As major tech giants reported massive capital expenditures that weighed heavily on free cash flow, the tech-heavy Nasdaq Composite tumbled 5.3%—its worst monthly performance since March 2025.

Yet, far from triggering a broad market collapse, the tech pullback sparked a healthy broadening of market leadership. Investors rotated decisively into value, dividend-paying, energy, and defensive sectors. While the headline, cap-weighted S&P 500 edged down 0.9% due to its heavy tech concentration, the Equal-Weight S&P 500 surged 5.0%, and the Dow Jones Industrial Average gained roughly 2.8%.

Adding to the constructive news for balanced investors, the bond market reclaimed its traditional role as a portfolio stabilizer. After the 10-year Treasury yield briefly touched a multi-decade intraday high of 5.31% early in the month, a mid-month flight to safety drove a powerful bond rally. Yields fell back to 4.94% by month-end, allowing core bonds to post strong positive returns just as growth stocks faltered.

Let’s Get Into the Data

• GDP Re-accelerates: The advance estimate for third-quarter U.S. GDP came in at an impressive 3.4% annualized rate, beating consensus expectations of 3.2% and accelerating from the second quarter’s 2.2% pace. Encouragingly, the GDP price index (deflator) cooled sharply to 2.2% annualized.
• Inflation & Energy Pressures: Escalating shipping disruptions in the Strait of Hormuz pushed West Texas Intermediate (WTI) crude up 15.2% and Brent crude near $118 per barrel. Driven by these higher energy costs, headline CPI inflation ticked up to 3.7% year-over-year, while core CPI edged up to 2.6%.
• Corporate Earnings Strength: Outside of mega-cap tech cash-flow concerns, corporate fundamentals proved remarkably resilient. With roughly 60% of S&P 500 companies reporting, blended third-quarter earnings growth stood above 30%, marking the third consecutive quarter of 25%+ profit growth.

What Does the Data Add Up To?

The latest economic data places the Federal Reserve in a delicate waiting game. At its October 28 meeting, the Federal Open Market Committee (FOMC) voted 10–2 to hold the federal funds rate steady at 3.75%–4.00%, following September’s 25-basis-point hike. Notably, the two dissenting members favored raising rates further, underscoring the central bank’s hawkish vigilance.

With the U.S. economy growing at a robust 3.4% annualized pace and domestic demand remaining strong, the economy is showing little need for monetary relief. At the same time, surging oil prices and sticky service-sector costs mean the Fed cannot declare victory over inflation just yet. Policymakers are weighing the sharp drop in the Q3 GDP price deflator against persistent energy shocks to determine whether another rate hike is warranted in December.

For investors, this environment reinforces why concentrated bets on a single sector carry hidden risks. The combination of strong corporate earnings across the broader economy and elevated starting bond yields means that well-diversified portfolios are once again being rewarded.

Number of the Month: 5.9%

The October performance gap between the Equal-Weight S&P 500 (+5.0%) and the standard, market-cap-weighted S&P 500 (-0.9%) serves as a powerful case study in the mechanics of market diversification.

To understand this 5.9% gap, it is helpful to look at how different index structures behave:

• Market-Cap-Weighted S&P 500 (SPY): In this traditional index, companies are weighted by their market value. When a small group of “Mega-Cap” technology companies grow immensely, they begin to dominate the index’s performance. In October, when those few tech Giants stumbled under the weight of high AI spending costs, their downward movement dragged the entire cap-weighted index into negative territory (-0.9%), even though most other companies in the index were doing well.
• Equal-Weight S&P 500 (RSP): This version gives every company—from the smallest to the largest—the exact same 0.2% weight. By stripping away the heavy concentration in a handful of giant tech stocks, this index provides a clearer picture of the broader, “average” stock’s health. In October, the equal-weight index’s 5.0% surge proved that the vast majority of sectors, such as value, energy, and defensive companies, were actually experiencing a very strong month.

This divergence highlight the fundamental role of diversification: relying entirely on yesterday’s biggest winners can leave an investor vulnerable when market leadership shifts. For a retirement-focused strategy, holding a balanced, tax-efficient mix of assets across various sectors and core fixed income can help smooth out these stark shifts in market leadership, providing the structural resilience needed to navigate changing economic cycles.

Market Performance

• Equity Markets in October
  • S&P 500 (Cap-Weighted): Declined 0.9% for the month (+11.7% YTD), weighed down by mega-cap technology and communication services.
  • S&P 500 (Equal-Weight): Rose 5.0%, reflecting strong breadth across energy, healthcare, utilities, and consumer staples.
  • Dow Jones Industrial Average: Gained roughly 2.8%, outperforming the Nasdaq by more than five percentage points.
  • Nasdaq Composite: Fell 5.3% as investors scrutinized the massive capital costs of the AI buildout.
• Bond Markets in October
  • 10-Year Treasury Yield: Peaked near 5.31% early in the month before rallying sharply to close October at 4.94%.
  • Bloomberg U.S. Aggregate Bond Index: Gained 2.3% in October (bringing YTD performance to -0.6%), cushioning equity volatility and restoring the traditional negative correlation between stocks and bonds.

Looking Ahead

As we move through November, markets will be closely watching the mid-month October CPI inflation report and the second estimate of Q3 GDP in late November. These releases will be critical in determining whether recent energy price spikes are continuing to push headline inflation higher, or if the Q3 disinflationary trend holds.

Investors will also keep a close eye on geopolitical developments in the Middle East and the Strait of Hormuz, as well as the conclusion of the Q3 earnings season, which will set the stage for the Federal Reserve’s final policy meeting of the year in December.

The Smart Investor

October was a textbook reminder that diversification is not broken—and that yesterday’s market leaders rarely lead forever. As we enter the final two months of the year, those stark sector divergences create valuable tax-planning opportunities. A drop in technology holdings paired with gains in value and energy positions makes November an ideal window to review your taxable accounts for tax-loss harvesting while rebalancing your portfolio back to its target allocation. Additionally, with Nov. and Dec. marking the home stretch of the tax year, now is the time to finalize Required Minimum Distributions (RMDs), Qualified Charitable Distributions (QCDs), and strategic Roth conversions before the December 31 deadline.

Thoughtful wealth management isn’t about predicting next month’s headlines—it’s about preparing your plan for whatever comes next. If you would like to review your portfolio’s tax efficiency, income strategy, or retirement readiness before year-end, contact the fiduciary team at Suttle Crossland Wealth Advisors in Scottsdale today.