If you use an extension like “ublacklist” or a userscript like “Google hit hider”, you can add the URL of those companies, and they will not show up in your browser search.

I’ve also started using Startpage.com for search (European) and set the region to Canada so it only shows me pages that are Canadian, and it works better than other region settings I’ve used in other search engines. Not perfect, but quite good. I wish it had the option to show all regions except American sites, but I’m sure that’s possible with an extension or something.