Baidu Faces Securities Class Action Over AI Business Claims After 12.73% Share Drop

What the lawsuit alleges

The case, Rosewood Funeral Home, Inc. v. Baidu, Inc. et al., was filed on September 14, 2026 in the U.S. District Court for the Southern District of New York (Case No. 26-cv-08012). It is brought on behalf of investors who bought Baidu securities during the class period, which runs from November 18, 2025 through August 17, 2026.

According to the complaint as described by the law firm, defendants made materially false or misleading statements and failed to disclose adverse facts about Baidu's business, operations and prospects. The complaint lists three specific claims:

• The company had overstated the ability of its AI business to mitigate rapid declines in its legacy online marketing business.
• As a result, the company's revenue was reasonably likely to decline.
• Defendants' positive statements about the business were therefore materially misleading or lacked a reasonable basis.

These are allegations. No class has been certified in the case so far, according to the law firm.

The earnings reports behind the share price moves

The release points to two earnings reports. On February 26, 2026, Baidu reported fourth quarter and full year 2025 results. Total revenue fell more than 4% year over year for the fourth quarter to RMB32.74 billion (or $4.68 billion) and more than 3% for the full year to RMB129.079 billion (or $18.458 billion). Management said its "AI-Powered Business" grew 48% year over year to RMB40 billion for fiscal year 2025, which it presented as mitigating the transition. Baidu American Depositary Shares fell $7.50, or 5.65%, to close at $125.15 that day, on unusually heavy trading volume.

On August 18, 2026, Baidu reported second quarter 2026 results. According to the release, Baidu General Business revenue fell 4% year over year to RMB25.2 billion (or $3.71 billion). Legacy Business revenue fell 23% to RMB10.4 billion, and total Online Marketing Services revenue fell 19% to RMB13.1 billion.

The release highlights the AI figures in particular. Baidu Core AI-powered business fell 8% quarter over quarter to RMB12.5 billion (or $1.86 billion). Its year-over-year growth slowed from 49% in the first quarter of 2026 to 25%. Its largest component, AI Cloud Infra, fell 17% quarter over quarter from RMB8.8 billion to RMB7.3 billion. The ADS dropped $13.25, or 12.73%, to close at $90.87 on August 18, 2026.

Deadline and options for investors

Lead plaintiff motions are due to the court by November 13, 2026. Investors who acquired Baidu securities during the class period and suffered losses may qualify for the class. The law firm says investors may retain counsel of their choice, or take no action and remain absent class members. It adds that investors can remain absent class members without serving as lead plaintiff.

The Law Offices of Howard G. Smith says it works on contingency, so investors owe no attorneys' fees out of pocket. Any fees and litigation expenses would be paid solely from a recovery, if achieved, and require court approval. The firm is based in Bensalem Township, Pennsylvania, and the release is marked as possible attorney advertising.

What it means for the market

The complaint centers on a question that investors in the company's results have faced: whether growth in AI products can make up for shrinking revenue in the older advertising-driven business. The release frames the August figures as evidence that the offset was weaker than earlier communications suggested. Baidu has not been found liable of anything, and the claims remain allegations that a court has yet to test. The release does not include a response from Baidu.