For those confused, this filing is reporting a name change because the operating business (including its brand, domain name, etc.) is being acquired by Verizon

For those confused, this filing is reporting a name change because the operating business (including its brand, domain name, etc.) is being acquired by Verizon out of what is now Yahoo! Inc. So the Yahoo business, its name, domains, and so on are not going anywhere as a result of this announcement. Altaba is just the name of of the company that will hold the investments that Verizon didn't acquire, including Alibaba shares.