Nine mega deals closed in the third quarter of 2026. That brought the year-to-date total to 24 completed transactions valued above US$10 billion, the highest nine-month count in WTW's Quarterly Deal Performance Monitor (QDPM), surpassing the highs of the previous M&A boom. Year-to-date deal value rose 23.9% compared with the same period in 2025, driven largely by those blockbuster transactions.
The numbers paint a market operating at full throttle. What the share price data shows is more complicated.
According to WTW's QDPM, produced in partnership with the M&A Research Centre at Bayes Business School, acquirers underperformed the MSCI World Index by 10.3 percentage points in the third quarter of 2026. That marks the second consecutive quarter of underperformance. Of the 200 deals completed in Q3, 121, or 60.5%, trailed the index. Only 79 outperformed.
The pattern holds year-to-date. Acquirers across North America, Europe, and Asia-Pacific have all underperformed their respective regional indices through the first nine months of the year.
The WTW data also shows dealmakers are moving faster. Quick deals, defined as those completed within 70 days of announcement, accounted for 43% of Q3 transactions, up from 35% in the previous quarter. Cross-sector deals, often pursued to secure new technologies or accelerate inorganic growth, rose to 35% of transactions from 25% in Q2.
"While faster deal execution reflects the increasingly dynamic nature of today's M&A environment, shaped by AI-driven transformation, geopolitical tensions and macroeconomic uncertainty, speed must not come at the expense of rigorous due diligence," said Jana Mercereau, head of Europe M&A consulting at WTW. "Companies that prioritize pace over discipline risk undermining long-term value creation and increasing the likelihood of post-closing challenges."
Those post-closing challenges carry a specific risk profile. W&I insurance claims activity has continued to build through 2025 and into 2026, according to RPC Legal's annual insurance review, with significant claims above US$10 million emerging in both the US and EMEA markets. The review notes that transactions from the pandemic-era dealmaking boom, where due diligence was compressed and pricing stretched, have been a primary driver of notifications. A market that is now accelerating timelines and scaling deal size simultaneously is creating similar conditions.
The regional picture adds further texture to the broader underperformance trend. North American dealmakers posted the sharpest single-quarter drop, underperforming their regional index by 13.8 percentage points while completing 109 deals, up from 103 in Q2. Asia-Pacific acquirers fared worse still, falling 18.7 percentage points below their regional index. European acquirers underperformed by 5.0 percentage points, recording their fourth consecutive quarterly volume decline since 47 transactions were completed in Q3 2025.
The one notable exception was the UK. British buyers bucked the regional trend, delivering outperformance against their benchmark. That divergence stands out against the otherwise uniform regional slide.
Chinese buyers also moved sharply in the other direction on volume. Completions jumped from seven deals in Q2 to 21 in Q3, a threefold increase in a single quarter. The surge comes as Asia-Pacific overall posted its worst regional performance in the dataset's recent history, suggesting Chinese deal activity is running on a different set of drivers to the broader regional trend. The pattern of buyers pressing ahead despite persistent underperformance has been a consistent feature of 2026.
The mega-deal resurgence is reshaping deal economics at the upper end of the market in ways that complicate straightforward analysis. Larger transactions take longer to integrate, carry more complex regulatory exposure, and generate more consequential warranty risk when something goes wrong after closing. Nine mega deals closed in a single quarter. That volume carries weight in a macro environment WTW describes as shaped by geopolitical tensions, rising interest rates and surging energy costs.
"Corporate buyers continue to show remarkable resilience despite persistent market headwinds," Mercereau said. "Even amid rising interest rates, surging energy costs and November's US midterm elections, dealmakers are expected to press ahead with strategic transactions, particularly at the upper end of the market."
The data, consistently and across every region, shows that closing deals quickly in a volatile environment has not been translating into market outperformance, and 2026 so far has not changed that.
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