noun which may take the genitive case particle 'no'
unpublished; unreleased; undisclosed; unlisted
Describes information, works, data, or securities that have not been made public. Common in business, media, and legal contexts.
Unreleased scenes from the movie were leaked online.
未公開株の取引には注意が必要だ。
You need to be careful when trading unlisted stocks.
未公開 is broader, covering anything not yet shown or opened to the public, while 未発表 specifically means information or work has not yet been announced or released.
private equity; unlisted shares
Compound of 未 (mi, 'not yet') + 公開 (kōkai, 'public release, disclosure').