Book entry is a system of tracking ownership of securities where no certificate is given to investors. Several terms are often used interchangeably with "book entry" shares including "paperless shares", "electronic shares", "digital shares", "digital stock certificates", and "uncertificated shares". Some of these terms have somewhat different connotations but, at least in the United States, state securities laws only recognize certificated and uncertificated shares. In the case of book-entry-only (BEO) issues, while investors do not receive certificates, a custodian holds one or more global certificates. Dematerialized securities, in contrast, are ones in which no certificates exist; instead, the security issuer, its agent or a central securities depository keeps records, usually electronically of who holds outstanding securities.

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