You're wrong. Privately held companies do not need to disclose any financial information to anyone, except in the case of a government audit. The only other time they would be required to provide financial information is to a bank when attempting to obtain a loan.
http://en.wikipedia.org/wiki/Financial_reports
It says "Today most governments require publicly-traded companies to issue, and issue in a certain way, annual financial statements. Some governments, such as the United Kingdom government, require all companies to publish annual financial statements, although smaller companies only need publish them in abbreviated form."
Notice, it says nothing about privately held companies. Last time I checked, Line was not based in the UK. Therefore their financial records are private.