Diversification Across the Cap Spectrum: Why The S&P Composite 1500 Matters

The S&P 500 fell 1% in October and dropped by 4% on Nov. 5, 2026, its worst day since April 2025, as AI-related worries weighed on tech stocks. Smaller caps have offered a refuge: in October, the S&P MidCap 400 and S&P SmallCap 600 outperformed the 500 by 3% and 4%, respectively.

Mega-cap stocks have dominated headlines, but historically, smaller companies have had an outsized impact on market returns. In particular, the S&P MidCap 400 and the S&P SmallCap 600 outperformed the S&P 500 over the past quarter century.

One mechanism that may help explain why small caps have tended to outperform larges caps is their value tilt, as small caps have typically traded at lower valuations than large caps. Exhibit 2 shows that, as of Sept. 30, 2026, the S&P 600 and S&P 400 traded at forward price-to-earnings (P/E) ratios of 13.0 and 14.6, respectively, compared to a forward P/E of 18.4 for the S&P 500.

By combining the S&P 500 with the S&P MidCap 400 and the S&P SmallCap 600, the S&P Composite 1500 encompasses larger and smaller stocks, offering a more comprehensive view of the domestic stock market. Notably, the S&P Composite 1500 covers more than 95% of the cumulative U.S. equity market capitalization, as proxied by the S&P Total Market Index.

This inclusion of smaller companies has meant that the S&P 1500™ has outperformed the S&P 500 over the long term. However, the outperformance of the index as a whole does not necessarily extend to the performance of the component stocks in the index. For example, 70% of companies within the S&P 1500 underperformed the index in 2025.

The posts on this blog are opinions, not advice. Please read our Disclaimers.

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Global Customers, Changing Leaders: Inside the S&P Global 100

A company’s commercial address tells only part of its story. Its customers tell another. In the S&P Global 100, U.S.-domiciled companies represented 80.7% of index weight as of Sept. 30, 2026, yet 53.9% of estimated index-weighted revenue came from outside the U.S. For this group of 100 multinational companies, the location of sales brings the index’s international character into focus.

Since our June 2025 review, the largest companies have increased their weight in the index, and sector leadership has shifted from Financials to Information Technology (IT). For investors assessing international business activity as trade policies change, the index provides a focused view of major multinationals.

Where Domicile and Revenue Diverge

As of Sept. 30, 2026, the S&P Global 100^®’s U.S. revenue share of 46.1% was close to the S&P Global 1200’s 47.0%; the corresponding U.S. domicile weights were 80.7% and 68.2%, respectively. The S&P 500 had a 100% U.S. domicile weight and a 57.8% U.S. revenue share. The S&P Global 100’s selection rules require eligible companies to generate more than 30% of revenue and hold more than 30% of assets outside their country of domicile. This screen applies across sectors, including IT.

That footprint was also evident in the earlier snapshot. Estimated U.S. revenue share was 43.8% on May 30, 2025, leaving more than half of weighted revenue generated outside the U.S. at both dates. The latest comparison therefore reinforces the multinational character highlighted in our earlier review.

Larger Companies and a Bigger Role for IT

IT’s growing prominence adds a practical dimension to this global story. Semiconductor value chains connect design, equipment and manufacturing across borders, illustrating the international networks behind technology businesses. The S&P Global 100 is float-market-cap weighted. Between May 30, 2025, and Sept. 30, 2026, its top 10 companies’ combined weight rose from 56.7% to 61.4%, an increase of 4.7 percentage points.

IT’s weight also rose from 43.8% to 47.6%. Exhibit 2 reflects both changes; more than three-fifths of index weight is in the top 10 companies and almost half is in IT. These overlapping measures show the growing influence of the largest businesses and technology within the multinational benchmark.

From Financials to IT

The sector contributions show how leadership changed within this multinational benchmark, from Financials in early 2025 to IT in the subsequent periods (see Exhibit 3).

January 2025-May 2025: Financials led, contributing 1.73 percentage points to the S&P Global 100’s 2.30% total return, while IT detracted 0.84 percentage points. By company domicile, non-U.S. constituents supplied positive contributions that more than offset the drag from U.S. companies. In the wider market, resilient profits and shareholder distributions supported European bank shares.

June 2025-December 2025: IT took the lead. The index gained 24.79%, with IT contributing 11.50 percentage points and Communication Services adding 5.25 percentage points. Together, the two sectors supplied approximately two-thirds of the net gain. 9 of the 11 sectors contributed positively. The broader U.S. technology rally in 2025 reflected enthusiasm for artificial intelligence (AI) and digital infrastructure.

January 2026-September 2026: IT’s share of the gain increased, accounting for approximately two-thirds of the index’s 14.57% gain and contributing 9.78 percentage points. Nine sectors again contributed positively, including Energy and Health Care. Across the wider technology market, AI disruption concerns weighed on software in early 2026 as investors favored semiconductor and memory suppliers.

The posts on this blog are opinions, not advice. Please read our Disclaimers.

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Introducing the S&P Kaiko Digital Asset Indices

Combining Institutional and Crypto-Native Indexing Expertise

2026 has marked a significant milestone for S&P Dow Jones Indices (S&P DJI) in digital asset markets. In early September, S&P DJI announced the integration of the S&P Digital Asset Indices with Kaiko’s Digital Asset Indices¹ into a unified framework.

Exhibit 1 demonstrates the multi-year commitment of S&P DJI and Kaiko to crypto indexing, including the development of indices across various market segments, from single-asset indices to multi-coin basket strategies, as well as specialized segment indices by sector and factor. Crypto indexing is evolving in a manner similar to traditional indexing in other asset classes, providing a comprehensive set of building blocks for reflecting different market views.

Single-Coin/Asset Indices

As of October 2026, the S&P Kaiko Digital Asset Indices offer two types of single-coin reference rates: S&P Kaiko Single-Asset Reference Rates (RFR) and S&P Kaiko Single-Asset Benchmark Reference Rates (BRR). The standard reference rates use a minimum of one vetted exchange in the calculation of prices, while the benchmark reference rates require a minimum of three vetted exchanges used in the price calculation. These options address varying levels of rigor needed by index users. Exchange-traded funds and traditional futures typically require higher pricing rigor, which may limit the number of eligible assets and result in pricing differences. Standard reference rates provide continuous pricing and are primarily used for perpetuals and other crypto-native product wrappers.

Similar to traditional indexing, there is an increased need for customization in crypto indices, including selection of exchanges, currency pairs (fiat versus stablecoins such as USDC and USDT), calculation window, lookback period and calculation frequency. These customizations allow reference rates to align with client requirements.

Size-Based Indices: Top Assets and Market Cap

In the multi-coin space, the S&P Kaiko Digital Asset Indices offer indices for both index-linked products and active managers seeking to outperform benchmarks. The S&P Cryptocurrency Broad Digital Asset (BDA) Index and investable indices are segmented by the largest 5, 10, 15, 20 or 30 assets. In addition to the top asset indices, the series includes a range of indices that exclude the largest assets such as Bitcoin (BTC) and Ethereum (ETH) with a focus on “altcoins.” The S&P Kaiko Digital Asset Indices are also offered in alternative weighting schemes such as equal weighting, capped percentages (e.g., 30% or 35%) or dual capping to mitigate concentration in single assets.

The posts on this blog are opinions, not advice. Please read our Disclaimers.

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The S&P 500 & HKEX Tech 100 Index combines Hong Kong-listed technology and innovation leaders and U.S. large caps within a single, rules-based benchmark. Its focus is on targeted growth from Hong Kong and China’s most innovative technology-oriented sectors while benefiting from the scale, sector breadth and liquidity of the S&P 500.

Launched on Sept. 30, 2026, this blended “index of indices” gives a weight of 62% to the HKEX Tech 100 Index and 38% to the S&P 500, with quarterly rebalancing. The index design is based on eligibility for the HKEX ETF Connect program.

The HKEX Tech 100 Index

As Hong Kong’s equity market continues to grow and evolve, technology- and innovation-driven companies are playing an increasingly important role. The HKEX Tech 100 Index reflects the performance of leading and emerging companies whose revenues are aligned with high-growth themes across Artificial Intelligence, Biotech & Pharmaceutical, Electric Vehicles & Smart Driving, Internet, Information Technology (IT) and Robotics. Industry (25%) and single-stock (8%) caps help mitigate concentration risk while maintaining meaningful weights in innovation leaders such as Tencent, Alibaba, Xiaomi and BYD.

The HKEX Tech 100 Index incorporates a fast-entry mechanism and quarterly adjustment to facilitate the timely inclusion of newly listed stocks if ranked in the top 35 by free float market capitalization and eligible for Southbound Stock Connect.

Why Add the S&P 500 to the Mix?

The S&P 500 component adds U.S. large-cap equities to the Hong Kong-listed universe, extending the blended index’s coverage across markets and sectors.

The S&P 500 is widely regarded as a leading gauge of U.S. large-cap equities. It includes 500 leading companies and covers approximately 85% of the U.S. equity market and more than half of global equity market capitalization. At year-end 2025, more than USD 23 trillion in assets was benchmarked or indexed to the S&P 500 across passive and active strategies, supporting efficient implementation and a highly liquid trading ecosystem.

A key characteristic of the S&P 500 is its broad sector coverage, reflecting the U.S. large-cap equity market. Although its industry and constituent composition evolves over time, the index has maintained a dominant global presence in several sectors. As of Sept. 30, 2026, Information Technology (including Nvidia, Apple and Microsoft) and Communication Services (including Alphabet, Meta and Netflix) represented 39.7% and 9.9% of the S&P 500, respectively. S&P 500 constituents in these sectors accounted for 55.7% and 73.4% of their respective global equity market capitalization, as represented by the S&P Global Broad Market Index (BMI). The S&P 500’s Real Estate, Energy and Health Care sectors also accounted for more than 50% of their respective global market capitalization.

The posts on this blog are opinions, not advice. Please read our Disclaimers.

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Private wealth managers sit at the intersection of market narratives and real-world client implementation. Their views can offer insight into how risk appetite and portfolio preferences are evolving, particularly when measured consistently over time.

In the latest S&P DJI Market Sentiment Survey for Wealth Indices (64th edition), 55 firms shared their 12-month outlook across major asset classes and other portfolio positioning questions. In this blog, we highlight a few headline takeaways and one notable deeper theme on domestic equity exposure that continues to develop.

Asset Class Sentiment—Equities Still Lead, Bonds Remain Out of Favor

At the headline level, equities remain the clear favorite, with alternatives also strongly supported. Bonds continue to be the least favored asset class, while cash sentiment is mixed (notably with a meaningful neutral camp).

Overall, this keeps the story consistent with recent quarters: managers appear willing to take risk primarily via public equities and liquid diversifiers, while remaining cautious on "traditional" fixed income at the broad asset class level.

Beneath the Headline: Domestic Equity Exposure Remains Structurally Low

This quarter, we revisited a question we last asked in 2024 regarding four risk profiles: Cautious, Balanced Asset, Steady Growth and Equity Risk:

At a Strategic Asset Allocation level, what is the approximate domestic equity exposure (as a proportion of overall equity exposure) for each of the four risk profiles?

For Steady Growth mandates, the message is consistent and fairly structural: domestic equity exposure is typically a minority share of overall equity exposure.

Key Takeaways

• The "below 30%" outcome dominates: In Q3 2026, 82% of Steady Growth portfolios held less than 30% domestic equity exposure (as a share of overall equity exposure).
• A continued shift toward the very low end: Within that sub-30% bucket, "less than 10%" allocations have become more prevalent, and the split between "less than 10%" and "10-30%" is now almost equal, pointing to a further retreat from moderate domestic allocations versus 2024.
• Five-year direction of travel supports diversification: Across the broader five-year view, managers are still more likely to report reducing domestic exposure than increasing it, reinforcing the same diversification narrative that shows up in Steady Growth mandates now.

How to Access the Full Report

The full survey includes the additional detail behind these headlines; full breakdowns across regions, sectors and currencies; plus conviction shifts versus prior periods. As with prior quarters, access to the full report is reserved for investment managers who complete the survey. Find out more on our website.

This content may be AI-assisted and is composed, reviewed, edited, and approved by S&P Global.

The posts on this blog are opinions, not advice. Please read our Disclaimers.