I don't know what this is supposed to mean, if anything. ??
What it means is A company saw another company that they wanted to buy, so they made an offer which was accepted, so Zillow now owns it.
Its like going to Walmart and seeing a pair of flip flops that you decide you want. You take it to the register, give the cashier your 2.99 and leave. You own the flip flops. Same thing on a smaller scale.
Hope this helps.