Tunku Naquiyuddin later headed Antah Holdings Berhad as its Chairman, a position held till 2007, which was vacated for a 5-year period during his tenure as the Regent of Negeri Sembilan from 1994 to 1999. He also hold important position in Carlsberg Malaysia. Tunku Naquiyuddin was also a Council Member of the Business Council for Sustainable Development, a Geneva-based organization, Founder and Head of the Federation of Public Listed Companies, Council Member of the Canada-ASEAN Center and Committee Member of the Bursa Malaysia. He is also the Pro-Chancellor of the Univ. Kebangsaan Malaysia, Patron of the Negri Sembilan Rugby Football Union, Seremban Half Marathon, Raintree Club (Kuala Lumpur), etc. He is the President of the Federation of Public Listed Companies (FPLC) since 1987, and Malaysian Water Skiing Association. He is the Patron of Malaysia Board Sailing Association, and Negri Sembilan Squash Racquet Association. He is the Chairman of the Board of Trustees of Tuanku Ja'afar Educational Trust since 1993, and of College. Tuanku Ja'afar since 1991; of Yayasan Tunku Naquiyuddin since 1995, Malaysia Wildlife Conservation Federation, Malaysia-France Economic & Trade Assoc. (MAFRETA), WWF for Nature (Malaysia), Seremban Half Marathon, Singer World Squash Championships, Antah Holdings Bhd. 1999, and Kian Joo Can Factory Bhd. Dir. Malayawata Steel Bhd., etc. Hon. Member Royal Selangor Golf Club. Rcvd: DK, SPTJ, PJK, DKYR, SPNS, SPMS, PPT, SPMP of Perlis (2001), Grand Collar of the Order of Bernardo O'Higgins of Chile (2004). A keen philanthropist, Tunku Naquiyuddin founded Yayasan Tunku Naquiyuddin, a charitable foundation that provides assistance to young students from poor families. He is also the founder and patron of the annual Seremban Half Marathon, whereby proceeds from the event are used to supplement financial needs of prospective junior athletes from the state. Tunku Naquiyuddin is married to the Perlis-born Tunku Puan Muda Tunku Dato' Seri Nur ul-Hayati binti Tunku Dato' Bahadur.