ZAI Shares Fall 5% After Coding Tool Accused of Unauthorized Data Uploads

Shares of Chinese artificial intelligence company ZAI Co Ltd (HK:2513) fell as much as 5% on Monday after its coding assistant tool was accused of uploading user data to external servers without explicit consent.

The Allegations and Market Reaction

The South China Morning Post, citing developers, reported that ZAI's ZCode assistant tool was transferring user workspace data to remote servers without approval. In response to the allegations, ZAI issued an apology and released a patch to address the issue. Despite the fix, developers noted the incident could harm the company's reputation, according to the SCMP report.

ZAI's stock dropped to HK$733.50 in Hong Kong trading, underperforming the broader market as the Hang Seng index gained 0.7%. The negative sentiment also appeared to affect rival AI firm MiniMax Group Inc (HK:0100), whose shares also declined.

Broader AI Security Concerns

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The incident occurs amid heightened global scrutiny over the security and ethical implications of advanced AI. The data breach highlights persistent concerns about how AI companies handle user information and the potential for misuse.

These issues are set to be a key topic at a landmark summit in Washington this week between U.S. and Chinese officials. On Sunday, U.S. Treasury Secretary Scott Bessent proposed an AI safety notification system between the two nations, underscoring the geopolitical importance of regulating the technology.

Company Background and Performance

ZAI is considered one of China's leading frontier AI labs and had a successful stock market debut earlier this year. Despite Monday's decline, the stock has gained approximately 466% year-to-date in 2026. However, the shares remain significantly below their post-IPO highs, which saw the company's valuation surge dramatically.