Abhi WordPress is owned by Automattic - a $1bn turnover company. See below
Matt Mullenweg built a company worth more than a billion dollars on software he started coding when he was a 19-year-old student at the University of Houston, but you’ll never see the WordPress name atop an office building.
That’s because Mullenweg’s Automattic, the parent company of WordPress, has no physical headquarters. Its 850-plus employees are scattered in 69 countries around the globe in what’s known as a distributed business. Mullenweg, who graduated from Houston’s High School for the Performing and Visual Arts, has become an evangelist for this way of working, and is developing a podcast and writing a book on the topic.
Source - https://www.houstonchronicle.com/business/texas-inc/article/Matt-Mullenweg-s-virtual-company-Automattic-is-13708522.php
Given the success of this product (and let's not deny it, the product is a brand literally everyone has heard of, like Nike, Adidas, etc), it's unlikely it'll ever be sold in my view. The real revenue comes from the .com iteration of the software, whilst the .org self-hosted side is free. WordPress will simply never "disappear" either - it is by far one of the largest ecosystems on the web, and given the impressive array of plugins, themes, and the like - for example, WooCommerce, it is the defacto standard in most cases because of it's extensibility.
Given the estimated value of Automattic and it's 100% disparate employee ratio, I very much doubt it's founder will have any intention of selling it on. Perhaps in years to come, but for now, he's only 36, so there's still a lot of mileage in him yet.