Ecommerce businesses contribute to 21% rise in turnover for the six months ended September 30.
Agreement will see Net-a-Porter and Mr Porter portfolios promoted via Alibaba's multiple mobile and web-based platforms.
The financial update came after Richemont's annual general meeting, at which Jérôme Lambert's promotion to the post of CEO was confirmed.
Mr Lambert is part of the fresh generation of leaders at Richemont that has been replacing what was seen as a stale, male group of older executives.
British co-founders Stuart Hennell and Matthew Bowling remain directors of Watchfinder.
Tim Stracke, co-chief executive of the company told WatchProUSA that the auction site is among a clutch of developments that are being rolled out this year.
Permanent unalterable ledger of all transactions could pinpoint location of timepieces across all primary and secondary sales channels.
There are many reasons why venerable Swiss watch companies are suddenly engaging with secondary market players, but among the most interesting is the way that the pre-owned platforms affect prices for new watches.
The data, the reach, the audience, the content and the unlimited shelf space for brands, make ecommerce players a clear and present threat to the old order.