Sure. But companies -- by which I assume you mean for-profit business firms -- are completely different entities from private militias, which is essentially what the Fenris Rangers are. Companies are organizations that rely upon the stability provided by governments to engage in commerce and which rely upon state institutions (and ultimately state violence) to protect their property interests. Private militias of the sort the Fenris Rangers represent tend to pop up in the absence of state institutions or state stability.
No one's saying it's impossible for the Fenris Rangers to still exist, but it's implausible. The private militias that developed in response to the collapse of the Iraqi government after the U.S. invasion, for instance, were gradually either absorbed by or ended up in conflict with the new Iraqi government. Most of the private militias that evolved during he Libyan civil war were either absorbed or dissolved after the rise of the new Libyan government. That's how it usually goes -- the private militia that emerges in the wake of state collapse normally either gets absorbed by the new regime or ends up dissolved.
There's always going to be a need for mercenaries (IOW, people willing to do dirty deeds for outrageous amounts of money).