ILG is the parent company of Interval International, a provider of membership and leisure services to the vacation industry.

ILG's principal business segment offers travel and leisure related products and services to owners of vacation interests and others primarily through various membership programs, as well as related services to resort developer clients.

As of December 31, 2012, nearly 2,800 resorts located in over 75 countries participated in Interval's primary exchange network.

[2] Interval Leisure Group (later renamed ILG) was spun off of IAC in 2008 as a publicly-traded company.

[3] In April 2018, Marriott Vacations Worldwide announced that they would purchase Interval Leisure Group for $4.7 billion, which was completed later that year.