It's a way of hiding/burying information. The info is legally required to be disclosed, but with so much else going on the news is unlikely to be widely covered.
This wouldn't have been widely covered regardless.
Nobody cares about Yahoo! anymore except in niche tech circles. That's why you're reading this on techcrunch.
A lot less oxygen to write one more "decline and fall of Yahoo" story or "what went wrong for Marissa Mayer" story.