The Stock Market Just Did Something for the Sixth Time Since 1957. History Says It Signals a Big Move in the S&P 500 in the Next Year.

The S&P 500 has staged a significant rebound, gaining 20.5% in the two months ending June 9, a performance historically achieved only five times since 1957. Previous instances of such strong two-month rallies have consistently led to average forward gains of 16% over six months and 31% over 12 months, suggesting potential for continued market appreciation. However, this optimistic outlook is tempered by ongoing trade tensions, with the 90-day tariff pause set to expire on July 9, posing a risk of market reversal if economic data disappoints or tariffs are re-imposed, potentially impacting GDP growth and investor sentiment.

Analysis

The S&P 500 has demonstrated significant momentum, posting a 20.5% gain in the two-month period ending June 9. This performance is historically rare, having occurred only five times since 1957. Analysis of these prior instances reveals a strong bullish precedent, with the index delivering average forward returns of 16% over six months and 31% over twelve months. However, this positive technical signal is countered by a substantial macroeconomic risk stemming from U.S. trade policy. The tariffs implemented this year have already pushed the average tax on U.S. imports to its highest level since 1941, prompting economists to slash the consensus U.S. GDP growth forecast for the year from 2.3% to 1.4%. A critical inflection point looms as the 90-day pause on the most severe tariffs is set to expire on July 9. The market's reaction will be heavily influenced by both the tariff decision and the release of key economic data on jobs and inflation in early July, creating a tense balance between historical momentum and near-term geopolitical uncertainty.

Key Decisions for Investors

• Given the powerful historical precedent for market gains following a 20%-plus two-month rally, investors could view this as a signal to maintain or increase exposure to broad market indices for the medium to long term.
• Investors must closely monitor trade policy developments ahead of the July 9 tariff deadline, as a failure to extend the pause could trigger significant market volatility and reverse recent gains.
• Upcoming releases of jobs and inflation data in early July are key catalysts; any disappointment relative to high market expectations could challenge the current rally and warrant a more defensive posture.
• Considering the conflicting signals of strong momentum and looming macro risk, investors should anticipate heightened volatility and ensure their portfolios can withstand a potential downturn without necessitating forced selling.