A Deep Dive into Sector Investing with State Street's Matt Bartolini

Episode Summary

Executive Summary: Matt Bartolini of State Street Global Advisors explains why sector investing remains powerful: the S&P 500 is more concentrated than ever, sectors offer high dispersion and low correlations, and rotation can add value when guided by momentum, value, sentiment, and macro signals. He also outlines how to evaluate thematic ETFs, where relative value sits, and why long-term investors should ignore short-term noise while keeping a broad, disciplined view.

Main Topics: S&P 500 sector concentration and historical shifts (Priority: 5/5): Bartolini describes how the index has become increasingly concentrated, with the top three sectors now comprising over half the index. He explains the evolution from a more industrial/energy-heavy market to one dominated by healthcare, technology, and consumer discretionary. GICS sector reclassification and communication services (Priority: 4/5): The discussion covers the 2016 and 2018 GICS changes, including real estate being carved out of financials and the creation of communication services from parts of telecom, tech, and consumer discretionary. Bartolini says this modernized sector classification better reflects business models. Why sector investing can add value (Priority: 5/5): Bartolini argues that sectors are attractive because they provide a high-dispersion, low-breadth opportunity set. He emphasizes that sectors are a major driver of risk and can be used top-down, bottom-up, technically, or thematically to generate alpha. Sector rotation strategies and factor/macro inputs (Priority: 5/5): The conversation compares momentum, valuation, sentiment, and macro-based sector rotation approaches. Bartolini says momentum has strong academic support, but value and sentiment can also be useful, especially when combined in a quantitative screen. Evaluating thematic ETFs (Priority: 4/5): Bartolini explains that standard valuation metrics can be misleading for thematic ETFs because many holdings are unprofitable, intangible-heavy, or growth-oriented. He argues enterprise value to sales is often a better starting point than P/E or P/B. Relative value across sectors and asset classes (Priority: 4/5): He highlights that financials, energy, and materials screen as relatively cheap versus the S&P 500, while discretionary and tech look expensive. He also notes that relative valuation should be assessed with composite measures rather than a single metric. Market structure, volatility, and long-term investor behavior (Priority: 4/5): The hosts and Bartolini discuss faster, more narrative-driven markets, options hedging, CTA activity, and fiscal/monetary stimulus. Bartolini’s core message is that investors should not overreact to short-term volatility and should focus on long-term cash flow and diversification.

Key Arguments: Sector investing sits between passive indexing and stock picking, offering a practical way to express macro, valuation, sentiment, or momentum views across a small number of highly differentiated exposures. The market is unusually concentrated today, with the top three sectors exceeding 50% of the S&P 500, which increases the importance of sector-level analysis. There is little empirical evidence that concentration alone predicts poor future performance; warnings about being cautious are mostly anecdotal. Sector rotation has strong academic support, especially momentum/relative-strength strategies, because sectors exhibit high dispersion relative to styles or countries. Low correlations and high dispersion create an environment where active sector selection can add value by overweighting leaders and underweighting laggards. Momentum, value, and sentiment can all be valid signals in sector rotation; combining them can improve selection even if sectors remain the primary driver of return. Business-cycle sector rotation has merit, but it should not be used in isolation because exogenous events can overwhelm macro signals. Thematic ETFs should not be judged solely by P/E or P/B because many holdings have negative earnings or large intangible assets; EV/sales can be more informative. Relative value is currently strongest in traditional value sectors like financials, energy, and materials, while tech and consumer discretionary look expensive on multiple valuation measures. Long-term investors should tolerate short-term volatility, focus on durable cash generation, and maintain diversified exposure because short-term market structure changes do not eliminate long-term fundamentals.

Data Points: Top three S&P 500 sectors: ~52% of the index - Healthcare, consumer discretionary, and technology together make up more than half of the S&P 500. Top sector weight in early 1990s: ~13% - Bartolini says the market was much less concentrated in the early 1990s. Bottom sectors below threshold: 4 sectors below 3% weight - He notes this is unusual and reflects current concentration. Real estate share of financials before carve-out: ~20% - Real estate was carved out of financials when GICS was modernized. Real estate weight after carve-out: ~3% of the S&P 500 - Its standalone size is now around 3% of the index. 2018 sector reclassification impact: ~10% of S&P 500 market cap affected - The communication services creation shifted a meaningful portion of market cap across sectors. Consumer discretionary moved to communication services: ~24% of consumer discretionary market cap - Legacy media and streaming-related names were reassigned. Technology moved to communication services: ~20% of tech market cap - Search, social media, and related software names were shifted out of technology. Long-term median sector dispersion: ~16% - Bartolini cites this as higher than styles or countries. Long-term median style dispersion: ~7% - Used as a comparison to show sectors are more dispersed. Long-term median G10 country dispersion: ~10% - Sectors also show more dispersion than major country exposures. Current active risk of example sector basket: ~14% - A hypothetical basket of energy, financials, and materials versus the S&P 500. Explained by sectors in example basket: ~70% - Most of the active risk is driven by sector allocation. Explained by factors in example basket: ~30% - The remainder is driven by factor exposures like value, momentum, and sentiment. Year-to-date performance of example basket: +2% YTD - Energy, financials, and materials basket as described in the discussion. Month-to-date performance of example basket: -6% MTD - The same basket had recently sold off with cyclical assets. Thematic ETFs with >50% growth exposure: 124 of 145 funds - Bartolini uses this to show why standard valuation metrics may be misleading. ETF thematic flow peak: Record flows in 2020 - Thematic ETFs drew exceptional investor attention and assets in 2020. Financials valuation rank: Bottom decile - Relative to the S&P 500 over the past 15 years on 12M P/E, P/B, and P/S. Energy and materials valuation rank: Bottom decile / inexpensive - Also screen cheap relative to the broader market. Standard 60/40 yield: Lowest on record - Low bond yields and expensive equities reduce portfolio income generation. Yield threshold discussed: Over 4% yield - Bartolini says there are very few markets offering this without taking credit risk. Senior loan average price: ~98 - Used to show loans are less stretched than traditional high yield. Traditional high yield average price: ~104 - Indicates more expensive valuations in high yield. Correlation of EM local debt and EM local currencies: 93% - Shows currency risk dominates the return profile of EM local debt. ETF sector lineup day with positive returns: 1 of 32 ETFs - One day in the discussed week had only one positive-return ETF in State Street’s sector and industry lineup. Next day positive returns: 32 of 32 ETFs - The following day, all 32 sector/industry ETFs were positive, illustrating fragility and rapid reversals. Frequency of all 32 ETFs positive: <1% of the time over 6 years - Bartolini uses this to underscore unusual dispersion and volatility.

Pivotal Quotes: "Be part goldfish and part elephant." — Matt Bartolini: Closing advice to investors: ignore short-term market noise but remember long-term market lessons and diversification benefits. "Sector investing is something very crucial to the broader State Street business, but also academically." — Matt Bartolini: He frames sectors as both an investable and research-supported concept with broad utility for investors. "If you can generate cash flow, that should be a sound fundamental strategy for investors." — Matt Bartolini: His long-term message that businesses with durable cash generation are likely to be rewarded despite short-term narrative shifts.

Implications: For investors, sectors remain a strong toolkit for expressing views and managing risk, especially in a concentrated market. Use composite valuation, momentum, and macro context, but avoid overreacting to volatility or relying on any single signal.