Nashville, TN – Groups360, a leading online marketplace for meetings, today announced that four major hospitality companies – Accor, Hilton, IHG (InterContinental Hotels Group) and Marriott International – have invested a combined $50 million in Groups360 to enhance the GroupSyncTM platform and make group travel easier for meeting planners. GroupSyncTM will deliver the first truly transparent, efficient and cost-effective online tool for meeting planners to source and book meetings and events across a wide selection of brands.