Their headquarters are located in Israel at Or Yehuda, 3 Ariel Sharon Blvd. MyHeritage's privacy policy notes their headquarters at the top of the page: https://www.myheritage.com/privacy-policy. They have branch offices in Lehi, Utah (2975 Executive Parkway, Suite 310), Burbank, California, and Kyiv, Ukraine. They had two smaller offices in Tel Aviv as of 2016, but I don't know whether or not those were subsequently consolidated.
In early 2021, MyHeritage was acquired by the private equity firm Francisco Partners, but the company's headquarters remained in Israel and founder Gilad Japhet remained as CEO. It was a few months after that acquisition that MyHeritage in turn acquired Filae, the French-based genealogy company.
They have about 530 employees in total, most of whom are in Israel. The DNA lab work for MyHeritage is outsourced to Gene by Gene in Houston, Texas, the parent company of Family Tree DNA. Gene by Gene and FTDNA were, themselves, acquired in 2021 by Australia-based myDNA, Inc.