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Record US Index Concentration Adds Hazards for Investors

06 July 2020

2 min read

James T. Tierney, Jr.| Chief Investment Officer—Concentrated US Growth

US Growth: Largest Stocks and Top Performers Have Shifted Over Time

Past performance does not guarantee futur results.
As of June 30, 2020
*Cumulative returns shown for Time Warner are from June 1, 2001 to June 14, 2018, prior to AT&T merger
Peaks shown are for the last day of each month displayed.
Source: FactSet, Russell Investments and AllianceBernstein (AB)

US growth companies led the second-quarter rebound, fueled by the five largest technology and new media stocks, which now comprise more than a third of the Russell 1000 Growth Index (R1000G). Investors should be alert to the risks of high benchmark concentration.

By the end of June, Microsoft, Apple, Amazon, Alphabet Inc. (Google) and Facebook made up nearly 37% of the R1000G. That’s the highest absolute concentration this index has ever seen.

Giants Don’t Dominate Forever

Turnover at the top has been frequent. Yesterday’s giants didn’t remain at the top forever. In the past, the largest growth companies included leaders in energy, healthcare, industrials and consumer staples. Some dropped far down in the growth rankings, while others fell off the growth index entirely.

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Many of these companies experienced performance challenges that undermined their dominant positions. Since the three previous periods when index concentration peaked, in only four instances has a top-five company gone on to outperform the R1000G.

Will Regulatory Risk Prompt a Change in Sentiment?

Today, technology, communications and e-commerce companies dominate the top slots, making for very narrow leadership. Their dominance has also led to a record concentration of US stocks in the MSCI World Index at nearly 66%—more than double 30 years ago. But as investors well know, past performance doesn’t guarantee future results.

That doesn’t mean these companies are bad investments as individual holdings. Each enjoys powerful business drivers as well as strong growth potential. But we think it’s imprudent to assume that all five will continue to lead the market indefinitely, especially with growing regulatory pressure threatening their dominant positions. US and European antitrust investigations are under way, while new acquisitions are facing increased scrutiny and ad-spending boycotts are spreading. And given the high correlation of returns for these stocks, investors seeking to capture growth through a passive portfolio that claims to offer diversification will actually have more than one-third of their risk concentrated in five names.

When a company’s growth drivers are compromised, investor sentiment can reverse very quickly. Investors should make sure they aren’t too heavily exposed to a small group of very large stocks—via passive or active portfolios—that may be subject to unpredictable risks.

The views expressed herein do not constitute research, investment advice or trade recommendations and do not necessarily represent the views of all AB portfolio-management teams. Views are subject to revision over time.

About the Authors

James T. Tierney, Jr.

James T. Tierney, Jr. is Chief Investment Officer of Concentrated US Growth. Prior to joining AB in December 2013, he was CIO at W.P. Stewart & Co. Tierney began his career in 1988 in equity research at J.P. Morgan Investment Management, where he analyzed entertainment, healthcare and finance companies. He left J.P. Morgan in 1990 to pursue an MBA and returned in 1992 as a senior analyst covering energy, transportation, media and entertainment. Tierney joined W.P. Stewart in 2000. He holds a BS in finance from Providence College and an MBA from Columbia Business School at Columbia University. Location: New York

This is a marketing communication. This information is provided by AllianceBernstein (Luxembourg) S.à r.l. Société à responsabilité limitée, R.C.S. Luxembourg B 34 305, 2-4, rue Eugène Ruppert, L-2453 Luxembourg. Authorised in Luxembourg and regulated by the Commission de Surveillance du Secteur Financier (CSSF). It is provided for informational purposes only and does not constitute investment advice or an invitation to purchase any security or other investment. The views and opinions expressed are based on our internal forecasts and should not be relied upon as an indication of future market performance. The value of investments in any of the Funds can go down as well as up and investors may not get back the full amount invested. Past performance does not guarantee future results.

This information is directed at Professional Clients only and is not intended for public use.

Record US Index Concentration Adds Hazards for Investors

Giants Don’t Dominate Forever

Will Regulatory Risk Prompt a Change in Sentiment?

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