Shared economy watchers have mostly had eyes for Uber these past 24 hours, as it filed a highly-anticipated prospectus for its U.S. IPO. But that same document also shed some light on the latest valuation of China’s own Didi Chuxing, which fought a bloody battle with Uber’s Chinese operation before the pair hastily merged in 2016 and Uber withdrew from the market.

The picture isn’t pretty.

Uber estimates the stake it got from Didi, whose other investors include tech giant Apple, was equal to about 18.8% of the company when the pair combined their China-based car services in August 2016. But that stake had fallen to about 15.4% of the company as of the end of September last year, according to Uber’s prospectus. 

At the same time, Uber said its Didi investment rose in value from nearly $6 billion at the end of 2017 to nearly $8 billion by the end of last year. Some simple math based on those figures shows that Didi was valued at about $51.6 billion at the end of last year, which assumes that Uber didn’t sell down any of its stake in the Chinese company in the last three months of the year.

While that number looks pretty enough, Didi was actually valued at $56 billion at the time of its last major fundraising in December 2017. That means the company’s value actually fell around 8% between the end of 2017 and the end of last year. 

That’s not all that surprising, given the uphill drive the company has faced over the past year. Didi was pummeled with negative publicity last year after two passengers were murdered by their drivers within the span of four months. More recently, the company has come under pressure as a growing number of its partners, many of them car-makers, set up rival ride-sharing services. 

Related: Latest Didi Killing Sparks Further Safety Fears – For Drivers