We all probably know the big mallet companies out there --- IP, Vic Firth, Malletech, etc. --- but it's worth noting that over the last several years, a number of startups have started coming out with really high quality sticks and mallets. Here is a brief list of companies worth checking out:

Artifact Percussion - https://www.artifactpercussion.com
Dragonfly Percussion - http://www.dragonflypercussion.com
Amy Putnam - http://aputnammallets.com
Salyers Percussion - https://www.salyerspercussion.com
Jason Ginter - http://jgpercussion.com
Daniel Kirkpatrick - http://www.dkpercussion.com 

To continue this thought, here are some upstarts doing things other than mallets:
Beetle Percussion (Eco-friendly pads) - https://www.beetlepercussion.com