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  1. ETF Strategist Content Hub
  2. Protecting Against a September Stock Slump
ETF Strategist Content Hub
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Protecting Against a September Stock Slump

Horizon   Sep 04, 2025
2025-09-04

While autumn officially begins in a few weeks, investors might have a different type of fall on their minds this month. That’s because stocks have a well-established history of losing ground in September. For example:

The S&P 500’s average September return over the past decade is -1.8%—the worst of any month (see the chart). The index has been down during four of the past five Septembers, with a -4.1% average return over that period.

S&P 500 Index Average Monthly Returns (Over the Past 10 Years)

SP500 Avg Monthly Returns

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There are factors that could help the S&P 500 buck the trend this time around. The economy has stayed strong (second-quarter gross domestic product growth was recently revised upward) and earnings have remained robust. What’s more, the widely-anticipated interest rate cut by the Fed later this month could help fuel continued stock market gains, if it happens. That said, potential danger signs include elevated valuations and high market concentration, with a relatively small handful of stocks driving the index’s gains of late.

Given both the current uncertainty and the historical patterns, it makes sense to consider ways to protect portfolios from some of the worst volatility and choppiness that could be coming our way—while also staying positioned to participate in potential further gains that may make September a month to remember for decidedly positive reasons.

By Mike Dickson, Ph.D.

Originally published at Horizon Investments

For more news, information, and analysis, visit the ETF Strategist Content Hub.

The S&P 500 or Standard & Poor’s 500 Index is a market-capitalization-weighted index of the 500 largest U.S. publicly traded companies. References to indices, or other measures of relative market performance over a specified period of time are provided for informational purposes only. Reference to an index does not imply that any account will achieve returns, volatility or other results similar to that index. The composition of an index may not reflect the manner in which a portfolio is constructed in relation to expected or achieved returns, portfolio guidelines, restrictions, sectors, correlations, concentrations, volatility or tracking error targets, all of which are subject to change. It is not possible to invest directly in an index. Information obtained from third party sources is believed reliable but has not been vetted by the firm or its personnel.

This commentary is written by Horizon’s asset management team. Past performance is not indicative of future results. Nothing contained herein should be construed as an offer to sell or the solicitation of an offer to buy any security. This report does not attempt to examine all the facts and circumstances that may be relevant to any company, industry, or security mentioned herein. We are not soliciting any action based on this document. It is for the general information of clients of Horizon Investments, LLC (“Horizon”). This document does not constitute a personal recommendation or take into account the particular investment objectives, financial situations, or needs of individual clients. Before acting on any analysis, advice, or recommendation in this document, clients should consider whether the security in question is suitable for their particular circumstances and, if necessary, seek professional advice. Investors may realize losses on any investments. Asset allocation cannot eliminate the risk of fluctuating prices and uncertain returns. All investing involves the risk of loss.

The investments recommended by Horizon are not guaranteed. There can be economic times when all investments are unfavorable and depreciate in value. Clients may lose money. This commentary is based on public information that we consider reliable, but we do not represent that it is accurate or complete, and it should not be relied on as such. The opinions expressed herein are our opinions as of the date of this document. These opinions may not be reflected in all of our strategies. We do not intend to and will not endeavor to update the information discussed in this document. No part of this document may be (i) copied, photocopied, or duplicated in any form by any means or (ii) redistributed without Horizon’s prior written consent. Forward-looking statements cannot be guaranteed. Other disclosure information is available at www.horizoninvestments.com.

Horizon Investments is a registered trademark of Horizon Investments, LLC

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©2025 Horizon Investments, LLC._

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