Key Takeaways:
The Hang Seng Index closed at 24,834, down 253 points or 1.01%, after a reported Chinese investigation into DeepSeek and Moonshot AI over data routed to Anthropic's Claude model drove the heaviest losses into the AI complex.
The probe, opened by the Cyberspace Administration of China, followed a 154-page Anthropic report alleging the two labs forwarded user prompts to Claude and trained their own models on the responses — a practice known as distillation. Anthropic said Moonshot AI sent more than 23 million inputs between May and July, while DeepSeek submitted 12.1 million in a 14-day window in July. The report said the prompts carried names, email addresses and corporate data belonging to hundreds of end users across at least 12 languages.
"Beijing is treating cross-border data flows as a national security file now, not a compliance footnote," said Cynthia Ho, Greater China equity strategist at Edgen. "That reframes the entire open-source model cohort as a policy risk rather than a growth story, and the market repriced it in a single session."
The damage was concentrated. Alibaba (阿里巴巴, 9988.HK) fell 4.36% to become the worst-performing blue chip, with short selling of $1.55 billion against a 16.17% short turnover ratio. Z.AI (02513.HK) plunged 12.4% on $970.28 million of short turnover, MiniMax (00100.HK) dropped 3.98%, and SenseTime (商汤, 0020.HK) slipped 1.58% on a 40.00% short ratio. Xiaomi (小米集团, 1810.HK) lost 3.75% ahead of its Xiaomi 18 Pro launch, with short turnover of $1.49 billion and a 44.55% ratio — the highest among the index heavyweights.
Key Takeaways:
The Hang Seng Tech Index fell 59 points, or 1.33%, to 4,379, underperforming the benchmark, while the Hang Seng China Enterprises Index shed 88 points, or 1.06%, to 8,273. Turnover reached HK$184.307 billion. The HSI opened 22 points lower before losses widened through the afternoon, settling near the session low.
The selling pressure extended beyond the AI cohort. Tencent Holdings (腾讯控股, 0700.HK) slid 2.35% on $1.52 billion of short turnover, Kuaishou (快手, 1024.HK) lost 1.41% with a 45.08% short ratio, and Baidu (百度集团, 9888.HK) fell 1.06%. Meituan (美团, 3690.HK) and JD.com (京东集团, 9618.HK) each declined less than 1%, cushioning the index from a steeper close.
Traders pointed to three drivers behind the session. The CAC investigation was the clearest, hitting every company named in Anthropic's report — a list that also included Alibaba, Zhipu, SenseTime, MiniMax and Xiaomi. Short positioning in the largest weights magnified the move: Alibaba, Tencent and Xiaomi together accounted for roughly $4.56 billion in short turnover. And the broad risk-off tone pushed both the HSI and HSTECH to their day lows into the close.
The timing adds a second layer. The probe surfaced days before a scheduled US-China summit, where AI governance is expected to be a central agenda item. Washington and Beijing have agreed to continue talks on AI safety and emergency communication protocols, with another meeting expected in Shenzhen within two months. Some observers read the investigation as a signal that Beijing is willing to be seen policing its own labs ahead of those talks.
Elsewhere in the market, the "three oils" traded softer after three hours of US-Iran talks. CNOOC (中国海洋石油, 0883.HK) fell 1.44%, PetroChina (中国石油, 0857.HK) lost 0.85% and Sinopec (中国石化, 0386.HK) slipped 0.45%. Weichai Power (潍柴动力, 2338.HK) dropped 3.16%, Sunny Optical (舜宇光学科技, 2382.HK) fell 3.13%, Laopu Gold (老铺黄金, 6181.HK) declined 2.70% and BOC Hong Kong (中银香港, 2388.HK) eased 1.91%. Li Auto (理想汽车, 2015.HK) was the standout gainer, rising 2.57%.
The read-through for positioning is narrow but sharp. If the CAC probe forces DeepSeek and Moonshot to abandon distillation-based development, the near-term cost advantage that made Chinese open-source models competitive narrows, and the valuation premium attached to the broader AI supply chain — from Alibaba's cloud unit to SenseTime's model licensing — faces a re-rating. The next checkpoint is the Shenzhen AI safety meeting, expected within two months, and any published findings or penalties from the CAC investigation before then.
This article is for informational purposes only and does not constitute investment advice.
