Securities class action filings jumped 30% in the first half of 2026, reaching 121 total complaints, up from 93 in the second half of 2025.
The surge was driven largely by a wave of AI-related lawsuits that, while representing just 13% of total core filings, accounted for nearly three-quarters of all alleged investor losses measured in the period. Fifteen AI-related securities class actions were filed in the first half of 2026, nearly equaling the full-year total of 16 recorded in 2025 and the annualized pace of 30 filings puts the category on track to nearly double last year's count.
The findings are from the Securities Class Action Filings — 2026 Midyear Assessment, published this week by Cornerstone Research and the Stanford Law School Securities Class Action Clearinghouse, supplemented with data from Stanford Securities Litigation Analytics.
The Disclosure Dollar Loss (DDL) Index, which measures market cap changes at the end of a class period, rose 77% to $529 billion compared with the second half of 2025, approaching the all-time semiannual high of $544 billion set in the first half of 2022. AI-related filings alone accounted for $385 billion of that figure.
"AI-related cases represented a modest share of total filings but an outsized share of alleged investor losses in the first half of 2026," said Joseph Grundfest, Stanford Law professor and former Securities and Exchange Commission commissioner. "That imbalance highlights the extent to which a small number of high-impact matters can influence trends across securities litigation."
The Maximum Dollar Loss (MDL) Index — which captures the peak-to-end market cap decline during a class period — reached $1.858 trillion in the first half of 2026, nearly triple the historical semiannual average of $667 billion. Just two of the 15 AI-related filings accounted for $1.235 trillion, or 66%, of the entire MDL Index for the period.
Technology sector filings climbed from nine in the second half of 2025 to 24 in the first half of 2026, driven in part by a surge in AI-related complaints within the sector. The sector comprised 78% of the DDL Index for the period despite representing only 21% of core filings — a concentration that signals significant litigation exposure for the large-cap tech names that dominate many client portfolios. Advisors monitoring risk at the portfolio level may find it worth reviewing [how securities litigation trends affect wealth management strategy](https://www.investmentnews.com) for their clients.
The pump-and-dump category itself emerged as a notable trend beginning in November 2025. A total of 10 such complaints have been filed since then — two in late 2025 and eight in the first half of 2026 — with nine of those 10 targeting non-U.S. issuers and filed in the Second Circuit. That geographic and issuer concentration may carry implications for advisors with exposure to smaller-float international equities.
Tariff-related allegations also appeared in six filings beginning in August 2025, typically claiming that defendant companies overstated their ability to manage or absorb the impact of US tariff policy. Four of those filings were brought in the first half of 2026.
A separate and emerging category involves business development companies (BDCs). Four recent filings — one in December 2025 and three in the first half of 2026 — alleged that BDCs overstated portfolio valuations, net asset values, or the effectiveness of restructuring efforts.
On the judicial front, the first half of 2026 produced three securities class action jury trials — the first multiple-trial period since 2009:
The likelihood of a core filing against a US exchange-listed company in 2026 is on pace to be the highest since 2019, with an annualized rate of 4.4% of NYSE- or Nasdaq-listed firms facing a securities class action, according to the Cornerstone Research report. That rate exceeds the 2012–2025 average of 3.8%.
The Second and Ninth Circuits continued to dominate venue activity, together accounting for 70% of core federal filings in the first half of 2026, up from 64% in the second half of 2025.
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