This earnings season has seen US corporate profits significantly surpass expectations.

The S&P 500 index posted a 31% year-on-year earnings increase for the second quarter, far exceeding Wall Street's prior forecast of 23%. According to Bloomberg Intelligence data dating back to 1992, this marks the strongest growth rate outside of the recovery period following a major recession. With over 90% of index members having reported, the index's first-half earnings performance is on track to be the best since the same period in 2021.

The driving forces come from two fronts: the accelerated adoption of artificial intelligence (AI) is compressing costs and boosting profit margins; simultaneously, the US economy has shown surprising resilience against multiple headwinds, including an energy price surge linked to the Iran conflict.

Empower Chief Investment Strategist Marta Norton commented, "Given the current macroeconomic backdrop, this result stands out even more."

AI: From 'Cost Center' to 'Profit Center'

The net profit margin for S&P 500 members, which had long struggled to break above 14%, is now approaching 16%.

Nationwide Funds Group Chief Market Strategist Mark Hackett directly pointed to the turning point: "Over the past five years, AI was a cost center for most companies, with only the hyperscale cloud providers benefiting from a stock price perspective. This year is an inflection point—AI is genuinely starting to function as a profit center."

Research from 22V Research estimates that AI is contributing approximately 150 basis points to the margin improvement. While the technology sector still holds the highest profit margins within the S&P 500, a growing number of companies from other industries are beginning to quantify the benefits of AI on their earnings calls.

This trend is not unique to the US. According to Deutsche Bank, the net profit margin for European companies in the second quarter surged to a record 12%. BI data shows that European executives mentioned AI an average of over four times per earnings call, a historic peak and significantly higher than the average of 0.5 times since 2016. Barclays strategists, including Emmanuel Cau, noted that "quantifiable cost and efficiency gains have become a core theme, with more management teams discussing benefits already realized."

Tech Sector Divergence: Who is Delivering on AI Returns?

This earnings season has also drawn a clear line within the technology sector: companies that can demonstrate AI investments are generating cash returns are rewarded by the market, while those that cannot are penalized.

Marta Norton noted, "The cloud business is perhaps the clearest signal." She specifically highlighted the strong performance of Amazon and Microsoft, whose cloud divisions both exceeded expectations.

In contrast, Facebook parent company Meta saw its stock price drop sharply after issuing revenue guidance deemed disappointing by the market, only recently beginning to recover.

Chip giant Nvidia has yet to report its earnings, making it the key market focus this month.

Valuation Compresses as Earnings Do the Heavy Lifting

Earnings growth has outpaced the index's price gains, leading to a key development: valuation compression.

The S&P 500's price-to-earnings ratio has fallen from around 26 times at the start of the year to below 22 times. One of the market's biggest concerns at the start of the year was high valuations, but this risk is now being absorbed by earnings growth.

Truist Advisory Services Chief Investment Officer and Chief Market Strategist Keith Lerner stated, "We've had a decent reset, and valuations have become more attractive."

Even the technology sector, which has posted earnings growth of over 20% for seven consecutive quarters, has seen a pullback in its valuation multiple. Lerner believes that given the uncertainty surrounding the Federal Reserve's policy outlook and energy prices, it is unlikely that tech stock valuations will return to their previous highs.

Citadel Securities Head of Equity and Derivatives Strategy Scott Rubner wrote in a report, "Currently, earnings are doing the heavy lifting, not valuation expansion."

JPMorgan Private Bank Global Investment Strategy Co-Head Grace Peters said on Bloomberg Television, "The magnitude of earnings upgrades is almost unprecedented—you don't see double-digit upgrades outside of a recovery period."

Earnings Broadening: Not Just a Mega-Cap Story

Wall Street strategists are optimistic about the sustainability of the earnings outlook, citing growth that is widespread across almost all sectors. Healthcare is the only sector in the S&P 500 experiencing an earnings contraction.

Data from Bespoke Investment Group shows that as of August 12, among the roughly 1,500 US-listed companies that have reported, about three-quarters have beaten both earnings per share and revenue expectations.

Ned Davis Research Chief US Strategist Ed Clissold said, "This story has moved beyond mega-cap stocks." He pointed out that the beat rate for small and mid-cap stocks is near the post-pandemic historical high.

US Bank Wealth Management Senior Investment Strategy Director Rob Haworth commented, "This earnings season shows positive breadth, which typically means the same momentum will continue."

Global Synchronization: Europe and Asia-Pacific Strengthen

The earnings improvement is not exclusive to the US.

BI data shows that the MSCI Europe Index components saw an 18% year-on-year increase in second-quarter earnings, the best performance since 2022. Cyclical sectors like energy, materials, and industrials made significant contributions, driving the Stoxx Europe 600, Germany's DAX, and France's CAC 40 to record highs.

BNP Paribas Equity Derivatives Strategist Benedicte Lowe noted on Bloomberg Television, "The European macro story is improving, which is undeniable. And this is happening while market positioning remains low to neutral, painting a positive picture for equities."

Barclays analysis also found that the proportion of European companies raising their guidance has reached its highest level in four years, with management teams confident in maintaining high profit margins.

The Asia-Pacific region is also keeping pace. Since June, earnings expectations for the MSCI Asia Pacific Index have been revised up by nearly 10%, the largest increase for a comparable period since 2009. Asian financial stocks just recorded their strongest monthly outperformance relative to the MSCI Asia Pacific Index since 1998.

Gama Asset Management Global Macro Portfolio Manager Rajeev De Mello stated, "The AI theme still dominates, especially in the semiconductor space. But investors are increasingly looking beyond obvious chip stocks to non-chip AI beneficiaries, financials, and other lagging sectors with less valuation pressure."

Outlook: Strategists Raise Target Prices

The strong earnings performance is prompting Wall Street strategists to raise their year-end target prices for the S&P 500. The average forecast has now risen to 7,894 points, suggesting roughly 1% upside from the record highs reached this week.

Analysts have also revised their full-year earnings growth forecast for the S&P 500 from 15% (as of early 2026 projection) to 27%.

Nvidia's earnings report will be the last major piece of the puzzle this month, and its results could further test the strength of this earnings-driven bull market.