As much as 12% of the daily volume on the New York Stock Exchange, and similar volumes on other major world exchanges, involves sales by institutional investors to brokers through blind portfolio auctions. Such transactions typically take the form of a first-price sealed-bid auction in which the...

This paper proposes a two-stage sealed-bid model for the execution of blind portfolios. An asset manager auctions a package of securities to a set of brokers who are unaware of the specific details about individual securities. We prove that our mechanism reduces the costs of execution for the...