To cite information from a company profile, use [Company profile] and Mergent Online as the author. Note that no date is providde, so you will need to use the "Retrieved from" date.
Mergent Online.(n.d.) Toyota Motor Corporation. [Company profile]. Retrieved October 14, 2020 from https://libguides.library.ohio.edu/business/databases/mergent-online
If you use Mergent Online to create company comparison tables, cite the table that you create with the description in brackets.
Mergent Online.(n.d.). [Company comparison report of Toyota Motor Corporation and competitors]. Retrieved October 14, 2020 from https://libguides.library.ohio.edu/business/databases/mergent-online
Mergent also contains stock/analyst/equity reports from multiple sources. It's important to try to cite the original source or author, which may not actually be Mergent Online. In the case below, I list Mergent Online as the database because the author is different.
Global Data. (2020, October). Toyota Motor Corp (7203) financial and strategic SWOT analysis review. [Analyst report]. Mergent Online. https://libguides.library.ohio.edu/business/databases/mergent-online