Apparently the company was sold or ownership restructured in march without prior notification of the regulatory body. The new owner is Gazprom Export LLC, of which ownership is unclear - it is suspected that Gazprom tries/tried to evade regulatory control over critical german infrastructure, thats why Minister Habeck has transferred control over to the Bundesnetzagentur as a trustee.

Edit: Source (paywalled, german) https://www.spiegel.de/wirtschaft/gazprom-germania-hat-berei...