Hi IronSeoul, What do you want to contact them about?
If it's just to make yourself known, maybe it would be best to wait until you've been notified by GEM that you're application has been matched. From the list below on the application statues, it seems like that's when the employer gets your information. That's just my opinion though. Maybe you can ask a fellowship advisor at your university for input on this subject. I got this list from GEM fellowship 2019 forum.
Matched - GEM thinks you're a good candidate and matched you with a company(companies)
Held - A company is reviewing your credentials and is considering an interview extension
Release - if you went from Held to Release then the company was looking at you, but decided to pick another scholar. (This can happen after an interview also).
Accepted - You got a company sponsor! Congrats!