Yup :blobsad:
And through Abebooks, Amazon also owns 40% of LibraryThing, which is why it isn't listed either.
BookFinder.com is also owned by Amazon through Abebooks.
It's amazing how many companies there are like this, where they do their best to hide their parents' identity.
(In real world products, the "Innocent" brand of smoothies implies it is independent, but it's actually part of Coca-Cola.)