After another year of skepticism that never quite materialized into a downturn, investors head into 2026 facing a familiar question. Can the stock market keep delivering upside when valuations remain elevated and policy risks are rising?
Coming into 2025, many strategists expected muted returns. Instead, the market surprised nearly everyone. The S&P 500 is up close to 18 percent for the year, powered primarily by a narrow group of artificial intelligence related leaders and massive capital spending on data centers, chips, and cloud infrastructure.
That outperformance has created both optimism and unease. Bulls argue that strong earnings and falling inflation can justify current prices. Bears worry that the rally has grown too concentrated and too dependent on favorable policy assumptions. To understand what could drive markets higher or pull them lower next year, several investment leaders shared their best and worst case scenarios.
What follows is not a forecast. It is a roadmap of risks, opportunities, and investor decisions that matter heading into 2026.
The Big Question for 2026: Can the Rally Broaden
One of the most important themes heading into next year is whether market leadership expands beyond a small group of megacap AI driven stocks.
Artificial intelligence spending has lifted earnings and valuations for a handful of dominant firms. That has masked weaker performance in many traditional sectors such as industrials, consumer discretionary, and parts of financials. For markets to sustain momentum in 2026, investors will likely need to see profit growth spread across more industries.
If that happens, upside remains possible even with high starting valuations. If it does not, volatility may increase sharply.
A Stagflation Risk No One Wants but Cannot Ignore
Lisa Shalett, chief investment officer at Morgan Stanley Wealth Management, outlined one of the most severe downside risks investors face.
“In terms of things that could go wrong, we could find ourselves in a stagflationary nightmare where growth ends up slowing and inflation flares back. That would occur through a combination of success in the deployment of generative AI, which leads to material pickup in unemployment, which materializes into real, genuine malaise in consumer spending at the same time a new Fed chair decides they want it ‘hot,’ and they convince the Fed governors to cut rates below 3%, and that ultimately causes an inflationary spike. So you get inflation on the one hand and poor growth on the other because unemployment is high, and the only thing that’s working are the same Magnificent Seven gen-AI stocks.”
This scenario highlights a rarely discussed risk. Productivity gains from AI could reduce labor demand faster than consumer spending can adjust. If monetary policy simultaneously turns too loose, inflation pressures could reappear just as growth weakens.
Shalett notes that markets are currently pricing in a much smoother outcome.
“The bull case is the one that’s priced in: Goldilocks! Everything is great! We got monetary stimulus, we got fiscal stimulus, we got financial services deregulation, and we got Goldilocks in terms of gen AI: You get all the benefits of productivity and none of the pain of labor layoffs.”
Her base case sits between extremes.
“In reality, I think we’re going to be somewhere in between those scenarios. I think the scenario that’s currently priced in is probably a little too bullish, but I think my bear case is too bearish. What we’re typically saying is that the S&P 500 grinds it out but there’s a lot of volatility and a lot of confusion during the year, especially leading up to what I think will be a very contentious midterm election. I think the markets are going to care about whether the Republicans lose control of Congress.”
Stimulus Could Fuel Growth but Bond Yields Hold the Key
Kevin Grimes, CEO and chief investment officer of Grimes & Co., sees meaningful tailwinds from both monetary and fiscal policy.
“Bull case first: There’s a fair amount of stimulus for next year, and it starts with monetary policy. The Fed is likely to continue cutting next year if justified. Kevin Hassett is going to come in at some point as chair and is probably going to be as easy as possible as far as policy goes.”
Grimes points to renewed bond purchases and fiscal measures as potential accelerants.
“On the fiscal side, all that stimulus from the One Big Beautiful Bill is going to hit. You have tax cuts, the elimination of tips for overtime, and the higher SALT deduction cap. They’re saying next year could be one of the biggest refund years ever. A bunch of business tax cuts also go into effect in 2026.”
According to estimates from the Joint Committee on Taxation, those measures amount to tens of billions in relief. Grimes believes that could support the lower end of the K shaped economy.
However, his warning is clear.
“The bear case comes back to bond yields. Anything that causes long-term rates to go up, whether it’s an uptick in inflation or inflation expectations, would be bad. It’s hard to see the 10-year Treasury below 4% for any extended period of time if the economy is OK.”
Higher long term yields raise borrowing costs, compress equity valuations, and challenge speculative assets. In Grimes’ view, returns may be positive but less comfortable.
“I think we’ll see modest returns and some volatility, so it’ll probably be less pleasant than what we’ve experienced the past several years.”
Earnings Outside AI Will Decide the Next Leg Higher
For Kara Murphy, chief investment officer at Kestra Investment Management, the key lies in corporate profits beyond technology.
“If we have a big up market next year, it’ll be because we start to see corporate earnings take off outside of AI names.”
Murphy notes that investors have seen brief signs of improvement, but not enough to drive a durable expansion.
“We want to see more traditional, old-economy companies start to benefit from an earnings resurgence. That would create a healthy rally in the market.”
She sees tax policy and capital expenditure incentives as potential catalysts, while remaining cautious about near term AI productivity gains.
“There’s also the productivity dream of AI, but I’m not so sure that will happen in the next 12 months.”
Her downside risks include labor market miscalculations and geopolitical shocks.
“I’ve been in this business for more than 25 years, and geopolitics are always among the risks. There’s always the potential for a big surprise that will disrupt the market.”
Murphy’s base case remains measured.
“Our base case for 2026 is moderate upside in equities and moderate upside in fixed income: high single digits in both, with a preference for equities.”
Policy Credibility Could Make or Break the Market
Brian Tall, chief investment officer at Brighton Jones Wealth Management, emphasizes stability and credibility as the foundation for continued gains.
“A bull-case scenario would include strong earnings from the tech sector, and especially the Mag Seven and other AI heavy-type companies, which would ease concerns about valuations.”
Lower inflation and predictable policy matter just as much.
“Inflation drifting back into the low- to mid-2% range would ease concerns about inflation reaccelerating. Fewer policy surprises out of the White House would be beneficial. And then, of course, a credible appointment to lead the Fed.”
His bear case highlights how fragile confidence can be.
“If a new Fed chair is not seen as credible, and they slash interest rates more than what the market feels is reasonable, and inflation hasn’t drifted lower, you might see short-term rates drop but the longer end of the yield curve spike up. That would be pretty jarring.”
Despite those risks, Tall leans constructive.
“But for next year, we would lean more toward the bull scenario.”
Concentration Risk Remains a Quiet Threat
Andrew Krei, co-chief investment officer at Crescent Grove Advisors, believes markets may finally confront concentration risk head on.
“In the bear case, the economy doesn’t crater but markets are finally forced to take rates and concentration risk seriously.”
Persistent inflation could trap policymakers.
“Inflation stays sticky, pressuring the long end of the yield curve and handcuffing the Fed’s reaction function. This compresses equity multiples and tightens financial conditions even without a classic recession.”
In this scenario, AI spending continues but fails to deliver near term returns.
“Spending remains heavy without any payoff to show for it. The market’s narrow leadership becomes a vulnerability.”
His bull case flips that dynamic.
“In the bull case, we see a combination of reaccelerating growth and inflation cooling faster than expected, giving the Fed room to cut meaningfully.”
Broadening participation is key.
“Investors remain enthusiastic about the AI theme, but the rally broadens beyond just the biggest names.”
The Base Case: Growth Continues, Returns Normalize
Across firms, a common thread emerges. Few expect a severe recession. Few expect another easy double digit year.
Most see a market that keeps growing but demands greater selectivity and patience.
Fiscal support and a more accommodative Federal Reserve may keep the expansion alive. Inflation is likely to cool slowly rather than collapse. Valuations leave little room for disappointment. That combination points to a choppier environment with higher volatility and returns driven more by earnings than enthusiasm.
What Investors Should Do Heading Into 2026
For everyday investors, the message is clear.
This is not the time to chase what already worked. It is a time to rebalance, diversify, and focus on quality earnings.
Opportunities may emerge in overlooked sectors, international markets, and companies with real cash flow growth rather than narrative driven momentum. Fixed income may once again play a stabilizing role if yields remain elevated.
The market is still offering opportunity. It is just asking investors to be more disciplined about how they pursue it.
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