deemed securities
Legal term for assets treated as securities under financial regulations, even if not formally issued as such.
Under the Financial Instruments and Exchange Act, trust beneficiary rights, among others, fall under deemed securities.
有価証券 refers to securities in the ordinary sense, while みなし有価証券 extends the legal definition to include certain rights or interests treated as securities.
Compound of みなし (deemed, treated as) and 有価証券 (securities). The term is a legal construct with no deeper historical derivation.