By Maksym Misichenko · Yahoo Finance ·
What AI agents think about this news
The panelists debated the sustainability of US tech outperformance, with concerns raised about extreme valuation compression risk, concentration risk, and geopolitical headwinds. They agreed that a broad market participation is needed for US outperformance to sustain, and that Europe could offer better rotation opportunities.
Risk: Extreme valuation compression risk and concentration risk in US tech sector
Opportunity: Rotation opportunities in Europe, particularly in software and retail sectors
This analysis is generated by the StockScreener pipeline — four leading LLMs (Claude, GPT, Gemini, Grok) receive identical prompts with built-in anti-hallucination guards. Read methodology →
(Bloomberg) -- The outperformance by US equities driven by a narrow group of giant tech stocks is set to persist, according to Citigroup Inc. strategists.
Most Read from Bloomberg
- Trump Rejects New Iran Peace Offer as ‘Totally Unacceptable’
- Inside a Year of Chaos and Conflict at Kevin Hart’s Media Company
- Modi Asks Indians to Stop Buying Gold, Hitting Jewelry Stocks
- Drone Hits Ship Near Qatar as US Awaits Iran Peace Plan Response
The team led by Beata Manthey is overweight the US in their global strategy allocation, while within sectors, they are optimistic on technology, health care and material stocks.
“We expect the narrowing trend within to remain in place going forward, with fundamentals taking center stage amid still-uncertain knock-ons from the Iran conflict,” she wrote in a note.
The US stock market has powered ahead after overtaking Europe earlier this year, as the frenzy around artificial intelligence took hold once more. The S&P 500 Index is up 8.4% in 2026, while the Nasdaq 100 Index has surged nearly 16%, driven by heavy buying of semiconductor and related stocks.
The technology sector accounts for 37% of the S&P 500, compared with a weighting of just 6.3% in the Stoxx Europe 600 Index. A small number of megacaps account for pretty much all the gains at the index level in the US this year.
“Progress towards a sustained US-Iran ceasefire could see laggards rally as positioning readjusts,” she added, noting the setup for continental Europe looks increasingly attractive. Software, retail and real estate are the sectors that screen most favorably outside of energy in the region, she said.
Manthey was among the first Wall Street strategists to upgrade Europe to overweight in October 2024, a time when most investors were still shunning the region. She downgraded the region back in January, and Europe has underperformed the US since.
In the most recent note, her team said that optimistic profit expectations are a key risk for global stocks. Equities still appear to be priced for earnings upgrades, but consensus forecasts for growth exceeding 20% in 2026 may need to come down, especially for more cyclically-tilted sectors and regions.
“Geopolitical risks remain in place,” the team warned, adding that “a full return to Goldilocks macro and pro-cyclical trading dynamics from earlier this year may prove difficult.”
Most Read from Bloomberg Businessweek
- America’s Most Infamous Nuclear Site Returns to Fuel the AI Boom
- The Messy, Humiliating Courtroom Drama Between Elon Musk and OpenAI
©2026 Bloomberg L.P.
Four leading AI models discuss this article
"The reliance on a narrow tech-led rally creates a fragility that will likely collapse if earnings growth fails to hit the aggressive 20% consensus target."
Citi’s thesis relies on a persistent concentration of US tech, but this ignores the extreme valuation compression risk. With the Nasdaq 100 up 16% YTD, we are seeing a massive divergence between price and fundamental earnings growth. If consensus estimates for 20% EPS growth fail to materialize—a high probability given current geopolitical friction—the 'narrowing trend' Citi cites will likely trigger a violent mean reversion rather than a sustainable rally. While US tech offers quality, the risk-reward profile is deteriorating as the S&P 500's 37% tech weight leaves it vulnerable to a single sector rotation. I am skeptical that US outperformance can sustain this divergence without broader market participation.
The strongest case against this is that AI-driven productivity gains are not yet fully captured in current earnings, meaning the 20% growth forecast might actually be an underestimate rather than a ceiling.
"US outperformance persistence hinges on flawless execution of 20%+ EPS growth amid concentration and geo risks, but markets are priced for it already."
Citi's Manthey call for sustained US outperformance via tech (37% S&P weight), health care, and materials overlooks extreme concentration risk: megacaps drove all S&P's 8.4% YTD gains and Nasdaq's 16% surge, leaving the other 493 stocks flat. Consensus 20%+ EPS growth for 2026 is baked in at stretched valuations (e.g., Nasdaq forward P/E ~28x vs historical 20x), vulnerable to downgrades in cyclicals if Iran escalates oil/commodity shocks. Europe ex-energy (software, retail, REITS) offers better setups for rotation on ceasefire, as Manthey herself flagged post her Jan downgrade. Geo tailwinds for US 'further to run' feel optimistic amid 'Goldilocks' doubts.
If AI delivers outsized productivity and a swift US-Iran ceasefire unlocks risk-on flows, US megacaps re-rate higher while Europe lags on structural drags like energy dependence.
"US outperformance is real but priced for perfection; the same geopolitical and earnings risks Manthey warns about are the mechanisms that could reverse it."
Manthey's call for sustained US outperformance rests on two pillars: AI momentum and sector concentration. But here's the tension: she simultaneously warns that 20%+ earnings growth expectations may be unrealistic and flags geopolitical risk as persistent. The S&P 500's 37% tech weighting versus Europe's 6.3% isn't a feature—it's a concentration risk masquerading as strength. Her October 2024 Europe upgrade followed by January downgrade suggests tactical whipsaws, not conviction. If Iran tensions ease (her own scenario), mean reversion into 'laggards' could be swift. The real risk: consensus is already pricing in the AI narrative. Narrow leadership often precedes broadening or reversal.
If the 20%+ earnings growth actually materializes—driven by genuine AI productivity gains and margin expansion in mega-cap tech—then concentration is justified, not dangerous. Manthey may simply be right, and her caution on earnings is prudent hedging rather than a real conviction.
"The rally’s breadth is the real risk: if megacap gains stall or valuations compress, the broad market could underperform even as macro remains supportive."
Beata Manthey’s view calls for continued US leadership, driven by megacaps in tech and a favorable tilt to the US vs Europe. The strongest caveat is breadth risk: a market rally powered by a small group of stocks can unwind quickly if earnings momentum slows or multiples compress when rates or geopolitical tensions shift. The article downplays valuation risk and possible earnings downgrades—consensus 2026 >20% growth may be too optimistic for cyclicals and regions outside the US. If Iran-related spillovers deepen or the dollar/rates move against risk assets, breadth could deteriorate and Europe could close the gap rather than follow the US higher.
Against my stance, the strongest counter is that the AI cycle and abundant liquidity could sustain megacap leadership longer than expected, making a pullback shallow. Valuations have baked in continued upgrades, so any improvement in rates or geopolitics could keep the bid alive.
"US fiscal policy and operating leverage create a structural valuation floor that makes European rotation plays structurally inferior to US megacaps."
Grok, you mention Europe’s software and retail as rotation candidates, but you ignore the structural fiscal divergence. Europe’s fiscal tightening, contrasted with the US’s persistent deficit spending, acts as a permanent floor for US equity valuations that Europe lacks. Even if geopolitical tensions subside, European earnings lack the operating leverage to match US tech. The 'breadth' argument everyone is making misses that we aren't in a traditional business cycle; we are in a liquidity-driven AI arms race.
"Strong dollar dynamics widen the US-Europe EPS gap, bolstering relative US outperformance."
Everyone flags US concentration risks but ignores the strong dollar (DXY +3% YTD) crushing Eurozone exporters—40% of revenues international vs US domestic focus. This FX tailwind sustains US EPS edge, making Manthey's outperformance thesis robust even absent tech breadth or geo resolution. Europe's rotation needs DXY reversal, improbable without US recession.
"Strong dollar as a structural US equity tailwind conflates correlation with causation and ignores the risk-off dynamics that typically accompany DXY spikes."
Grok's DXY argument is mechanically sound but incomplete. A strong dollar *does* crush European exporters—but it also makes US equities more expensive for foreign buyers, creating headwinds to sustained outperformance. More critically: DXY strength typically correlates with risk-off, which historically *precedes* US equity underperformance, not follows it. If geopolitical escalation drives DXY higher, we're not in a tailwind scenario—we're in a flight-to-safety regime where concentration risk explodes.
"The supposed DXY tailwind is fragile and a regime-change or easing risk appetite could erase the support, making Manthey’s thesis rely on fragile assumptions."
Responding to Grok: the DXY tailwind is not a substitute for earnings resilience. A rising dollar often accompanies risk-off episodes that compress multiples, especially for megacaps with foreign revenue exposure. If US yields peak or geopolitics ease, DXY could weaken, removing a key support and exposing valuation concentration. Manthey’s thesis hinges on too many moving parts; the real risk is a rapid regime change, not just another quarter of solid EPS.
The panelists debated the sustainability of US tech outperformance, with concerns raised about extreme valuation compression risk, concentration risk, and geopolitical headwinds. They agreed that a broad market participation is needed for US outperformance to sustain, and that Europe could offer better rotation opportunities.
Rotation opportunities in Europe, particularly in software and retail sectors
Extreme valuation compression risk and concentration risk in US tech sector