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 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.