As Zenimax is a private ( meaning unlisted on the stock market) company, I don't think they have to disclose that.
From Wikipedia on private companies:
Privately held companies generally have fewer or less comprehensive reporting requirements for transparency, via annual reports, etc. than do publicly traded companies. For example, in the United States, unlike in Europe, privately held companies are not generally required to publish their financial statements. In Australia, Part 2E of the Corporations Act 2001 requires that publicly traded companies file certain documents relating to their annual general meeting with the Australian Securities and Investments Commission, while there is no similar requirement for privately held companies.
My Emphasis