Asuming that you have a Windows laptop you can use a virtual wifi router like mHotspot, a free software, that allows you and creates a secure wifi hotspot. You can share single internet connection(LAN, Ethernet, Data-Card, 3G/4G, Wifi) for multiple devices like Laptops, iPhones, Android phones, PDAs, iPads etc.
(Note: It's free but marked as Bundleware: The installer contains Opencandy. If you want to install it, DECLINE all the other softwares in all the steps of the downloader.)
There are other options like Connectivity Hotspot (Freemium) or Virtual Router Plus (OpenSource, maybe flagged as malware but it's okay - but double checking never hurts) too.
For macOS I believe there is only Tanaza.
In any event, as pointed out by others, double check if you are in line with your company's policies in advance.