The US stock market has been on a tear through much of 2025, with the S&P 500, Dow Jones Industrial Average, and Nasdaq 100 repeatedly setting record highs. Investor confidence remains strong amid signs of economic resilience, further bolstered by recent data suggesting that core inflation has begun to moderate. However, Morgan Stanley’s wealth management division cautions that the current rally may be on borrowed time. In a recent outlook, the firm identified three key risks that could threaten the market’s momentum and unsettle investors.

1. Waning Economic Growth Momentum

The first major risk highlighted by Morgan Stanley is the potential for a slowdown in the US economy’s recent strength. While GDP growth appeared robust in the first half of 2025, several indicators now point to a possible moderation heading into the fall and winter. Recent employment data show signs of cooling, with job openings dipping below pre-pandemic levels and household spending moderating as high borrowing costs bite into disposable income.

“A resilient labor market supported much of the rally earlier this year, but we’re starting to see early warning signs,” said Lisa Shalett, Chief Investment Officer at Morgan Stanley Wealth Management. “If economic momentum slows more rapidly than expected, it could weigh heavily on corporate earnings and by extension, stock prices.”

Additionally, consumer confidence has slipped amid ongoing uncertainty about inflation and the future direction of interest rates. Although July’s CPI inflation print provided relief with a moderate rise of 2.7% year-over-year, the specter of stagflation—or a combination of sluggish growth and stubborn inflation—remains a concern for analysts.

2. The Return of Tariff Risks

The second risk is the reemergence of trade frictions and tariffs, which could undercut the earnings outlook for US companies with global exposure. In recent weeks, proposed tariff increases on key goods—especially from major trade partners like China and the European Union—have rekindled worries about disrupted supply chains and higher input costs.

“The geopolitical backdrop remains fraught, with the threat of new and retaliatory tariffs in the run-up to the US presidential election,” noted Morgan Stanley in its August report. “These trade measures could add further pressure to margins, particularly for US manufacturers and large technology exporters.”

Tariffs also have broader macroeconomic consequences. Increased costs for raw materials and finished goods can feed directly into inflation, complicating the Federal Reserve’s job and potentially forcing it to keep interest rates higher for longer. According to a recent survey by the National Association for Business Economics, 58% of respondents said trade tensions were a top concern for growth over the next year.

3. Persistent Inflation and Federal Reserve Policy

The third risk centers on the persistence of inflation and the ongoing uncertainty around the Federal Reserve’s monetary policy stance. Despite the recent cooling in core CPI metrics, wage growth and shelter inflation remain sticky, keeping headline inflation above the Fed’s 2% target. Morgan Stanley warns that if inflation stalls at current levels or rebounds in the second half of the year, the Fed could delay rate cuts, thereby sustaining tight financial conditions.

Markets initially anticipated at least two rate cuts by December 2025, but the odds have shifted after central bank officials suggested a “wait and see” approach. Fed Chair Jerome Powell, in his August press conference, underscored that “we are prepared to maintain a restrictive policy stance if inflation proves more persistent than anticipated.”

High interest rates continue to affect sectors reliant on financing, such as real estate and speculative technology firms. At the same time, the yield curve remains inverted, a classic recession warning that has historically preceded market pullbacks and economic contractions. Recent data from the Treasury Department shows the 10-year yield hovering around 4.29%, while the 2-year stands near 3.73%, deepening the curve inversion further.

Wall Street Cautiously Optimistic but Hedging Bets

Despite these risks, not all analysts are ringing alarm bells. Several large institutional investors—such as Goldman Sachs Asset Management and Vanguard—have suggested a “cautious optimism” position, advocating portfolio diversification and selective exposure to defensive sectors such as healthcare, utilities, and consumer staples.

Still, many managers are advising clients to rebalance their portfolios by trimming exposure to highly valued, crowded trades in AI and technology, and increasing allocations to bonds and alternative assets. According to the latest Bank of America Global Fund Manager Survey, cash balances have risen to a 12-month high, indicating a degree of skepticism about the sustainability of the rally.

“We’ve reached a stage where complacency is a real risk,” said Shalett. “Risk management, diversification, and attention to valuation will be key in the months ahead.”

What Should Investors Do Now?

For retail and institutional investors alike, Morgan Stanley’s advice in this environment boils down to three core recommendations:

1. Stay diversified: Avoid over-concentration in mega-cap tech stocks or high-beta sectors vulnerable to cyclical downturns.
2. Consider higher bond allocations: With yields at multi-year highs and volatility picking up in equities, bonds offer both income and risk mitigation benefits. Vanguard recently suggested that investors consider overweighting bonds relative to stocks for the next decade.
3. Monitor macroeconomic indicators: Pay close attention to leading data on employment, inflation, and trade policy to anticipate turning points before they are fully reflected in market prices.

Market participants are also watching closely for policy developments, earnings season results, and additional Fed commentary, all of which could provide new direction signals for global capital flows.

Looking Ahead: Volatility Could Return

While the US stock market remains near historic highs for now, Morgan Stanley’s warning serves as a timely reminder of the many moving parts influencing today’s capital markets. With potential headwinds from slowing growth, tariffs, and persistent inflation, investors would be wise to temper expectations and brace for a possible return of volatility as 2025 enters its final stretch.

Ultimately, vigilance, adaptability, and a commitment to prudent portfolio management will be essential for navigating what could prove to be a pivotal period in the global investment landscape.