You should use h1 for the page name, not for the company name. Just enter the company name in the div and create it as a title.
For SEO purposes, the company name is not partial to the page. It’s more important to get different page titles so that search engines don’t think that all of your pages are just different versions of the same page.
Using the company name as the title means that you reduce the relevance of the page title, which makes it less likely that search engines index pages by keywords.
An exception is, of course, the main page of the site, where it makes sense to assign the name of the company to the most relevant information.
Guffa
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