Securities class action filings in United States federal courts rose 30 percent in the first half of 2026, reaching 121 complaints compared with 93 in the second half of 2025. Filings tied to artificial intelligence drove much of that increase, according to the Securities Class Action Filings 2026 Midyear Assessment from Cornerstone Research and the Stanford Law School Securities Class Action Clearinghouse.

Investors filed 15 AI related securities class actions in the first six months of the year, close to the 16 recorded across all of 2025. At an annualized pace of 30 filings, the category is on track to nearly double last year's count. Those cases made up 13 percent of core filings and accounted for nearly three quarters of all alleged investor losses measured in the period.

The Disclosure Dollar Loss Index, which measures market capitalization change at the end of a class period, rose 77 percent to $529 billion, approaching the record of $544 billion set in the first half of 2022. AI related filings accounted for $385 billion of that figure. The Maximum Dollar Loss Index reached $1.858 trillion, close to triple the historical semiannual average of $667 billion, and two of the 15 AI cases accounted for $1.235 trillion of it.

Technology sector filings climbed from nine to 24 over the same period, making up 78 percent of the Disclosure Dollar Loss Index while representing 21 percent of core filings. Stanford Law professor Joseph Grundfest, a former Securities and Exchange Commission commissioner, said the imbalance highlights "the extent to which a small number of high-impact matters can influence trends across securities litigation."

Source: InvestmentNews - https://www.investmentnews.com/regulation-legal-compliance/ai-lawsuits-surge-to-dominate-securities-class-action-filings-in-2026/267629