What happened 

Shares of Chinese delivery company ZTO Express Inc (NYSE:ZTO) fell as much as 10.6% in trading Friday after announcing fourth-quarter 2017 results. There wasn't much of a recovery today, either, with shares trading 10% lower at 3:30 p.m. EST. 

So what

Fourth-quarter revenue jumped 35.7% to $665.7 million, topping the $640 million analysts were expecting. Adjusted net income was also up 71% to $194.5 million, or $0.28 per share, topping estimates by $0.04. While past results aren't what left investors disappointed, guidance may have. 

Boxes on conveyor system.

Image source: Getty Images.

Management said they wouldn't be giving revenue guidance going forward, which may have surprised investors today. But they did say that parcel volume is expected to increase 28% to 30% in the first quarter versus a year ago. Net income is also expected to be in the range of $103.0 million to $107.6 million. 

Now what

Long term, I don't think there's anything about this earnings report that should alarm investors. ZTO Express is still growing quickly and is very profitable. But investors like to know what's coming in the future, so less guidance may be making them uneasy today. But that's not a great reason to sell the stock, making today a great buying opportunity for long-term investors.  

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.