Baidu Faces Securities Class Action After 12.73% Share Price 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 covers purchasers of Baidu (NASDAQ: BIDU) securities during a class period running from November 18, 2025 to August 17, 2026.

The complaint alleges that defendants made materially false or misleading statements and failed to disclose adverse facts about Baidu's business, operations and prospects. It lists three specific claims:

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

These are allegations from a complaint, as described in a press release by the law firm. No class has been certified yet.

The earnings reports behind the share drops

According to the release, the first drop followed Baidu's fourth quarter and full year 2025 results, published on February 26, 2026. Total revenue fell more than 4% year over year in the fourth quarter to RMB32.74 billion ($4.68 billion), and more than 3% for the full year to RMB129.079 billion ($18.458 billion). Management said its "AI-Powered Business" grew 48% year over year to RMB40 billion for 2025. Baidu's American Depositary Shares fell $7.50, or 5.65%, to close at $125.15 that day.

The larger drop came after second quarter 2026 results on August 18, 2026. The release says Baidu General Business revenue fell 4% year over year to RMB25.2 billion ($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 also points to the AI segment. Baidu Core AI-powered business fell 8% quarter over quarter to RMB12.5 billion ($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, dropped 17% quarter over quarter, from RMB8.8 billion to RMB7.3 billion. The ADS fell $13.25, or 12.73%, to close at $90.87.

What investors can do

Any class member may ask the court to appoint them lead plaintiff, but motions must be filed by November 13, 2026. The lead plaintiff is the investor or group of investors who represents all class members and oversees the case. Under the Private Securities Litigation Reform Act, courts generally presume that the movant with the largest financial interest is the most adequate choice, according to the release.

Serving as lead plaintiff is not required to share in any recovery. Investors may take no action and remain absent class members, and they may retain counsel of their choice. Glancy says it represents investors on a contingency fee basis, meaning no attorneys' fees are paid unless there is a recovery, with any fees subject to court approval.

Charles H. Linehan, a partner at the firm, said the deadline "is the first major step in this case." The release is attorney advertising, and the firm notes that prior results do not guarantee a similar outcome.

What it means

The case turns on a question that matters to Baidu watchers: whether growth in AI products can make up for shrinking revenue in its older advertising business. The allegations are unproven, and Baidu's response is not part of the source material. For shareholders who bought during the class period, the practical point is the November 13, 2026 deadline for anyone wanting a lead role in the case.