Русско-англо-русский юридический словарь

Sometimes referred to as non-certificate shares, the book share is simply a share that is held by a transfer agent, rather than being held in the possession of the owner or client. The book shares are recorded in the records that are maintained by the agent, so that there is always a permanent record of the value of the shares, and who holds the rights to the shares. However, the actual stock certificates are never printed or forwarded to the investor. Uncertificated shares are not uncommon at all. (WiseGEEK)

Shares may be nominative, endorseable, to bearer or book shares. Book shares are those that are kept in deposit accounts opened in the name of their holder with the institution that he may, designate and for which no share certificates are issued. (Comparative Survey of Securities Laws: A review of the securities and related laws of fourteen nations by International Bar Association Staff)

Book-Entry Securities (Book Shares): Shares that are registered in the shareowner's name on the company's books rather than held in the form of a physical certificate. Shares held in book-entry have all the traditional rights and privileges as shares held in certificate form. (wellsfargo.com)

book share a share of a mutual fund credited to the account of a shareholder without the physical issuance of a certificate evidencing ownership. Also called uncertificated share. (dictionary.com)