Fonds consists of records that document every aspect of Neptune Theatre as an organization, including various textual records and graphic and audio-visual material pertaining to productions, events, personnel, and the administration of the Theatre. Types of records include correspondence, meeting minutes, reports and newsletters, financial records, box office records, applications, licenses, contracts, scripts, posters, newspaper clippings, production notes, programs, press kits, videocassettes, audiocassettes, negatives, contact sheets, slides, photographs, and other materials.

Fonds primarily consists of documentation related to publicity, personnel, equity, and the Canada Council for the Arts as well as scripts, production-based records, administrative files, correspondence, PACT files, contracts, annual meeting notes, ROADies records, financial statements and information, board meeting notes, brochures, audio tapes, photographs, and production posters.

Fonds consists of records pertaining to the administrative, operational, financial, and artistic activities of the ASO. Included are materials documenting the Board of Directors, box office operations (including ticket sales), financial affairs, fundraising, general administration, guest artists, orchestra members, public relations and publicity, and the union. Also included is the photograph series which presents a visual record of various aspects of the orchestra's activities, including performances and women's auxiliary events as well as publicity shots of musicians, conductors, staff, and guest artists.