The most precise figure yet attached to DeepSeek’s worth did not come from the lab, its bankers or its founder.

It surfaced in a stock-exchange filing by Anhui Korrun, a Chinese luggage maker, which discloses a stake small enough to imply the Hangzhou AI startup is valued at around $52bn.

The arithmetic is narrow but specific, and it is the reason a suitcase manufacturer briefly became an AI story.

Korrun’s subsidiary Ningbo Purun put 2.9bn yuan into a fund managed by Monolith Management, taking a 0.8265% indirect stake in DeepSeek at a level comfortably above the $45bn valuation floated in May.

Reverse the maths and the whole company prices out at 350.88bn yuan, or roughly $51.8bn, per the filing first reported by Reuters.