The organization this individual is charged with the management of – especially an independent legal entity such as a company or nonprofit institution. The CEO of an organization typically reports to the board of directors.
'Deborah Liu' → 'CEO of' → 'Ancestry' citation: https://www.ancestry.com/corporate/about-ancestry/our-team/board-of-directors. In this official team breakdown from Ancestry, Deborah Lieu's position is marked as 'President' and 'CEO'. An interim CEO should not be considered 'CEO' until either 1. their interim status is removed and they are made CEO indefinitely 2. qualifiers enable the nature of the statement to be more specifically described.