From wiki:
X Corp. is an American
technology companyestablished by business magnate
Elon Musk in 2023 as the successor to
Twitter, Inc. It is a
wholly owned subsidiary of
X Holdings Corp., which is itself owned by Musk. The company owns the
X (formerly Twitter) social networking service and has announced plans to use it as a base for other offerings.
Twitter.com is still active.
All he did is replace the bird and link twitter to x.com. X Holdings Corp seems to be a name change but don’t hold me to that.
So X Holdings Corp is now the parent company.