Rule 13-d


Often used in risk arbitrage. Requirement under Section 13-d of the Securities Act of 1934 that a form must be filed with the SEC within ten business days of acquiring direct or beneficial ownership of 5% or more of any class of equity securities in a publicly held corporation. The purchaser of such stock must also file a 13-d with the stock exchange on which the shares are listed (if any) and the company itself. Required information includes the way the shares were acquired, the purchaser's background, and future plans regarding the target company. The law is designed to protect against insidious takeover attempts and to keep the investing public aware of information that could affect the price of their stock. See: Williams Act.

Investing Essentials

Copyright © 2011 Campbell R. Harvey, Professor of Finance, Fuqua School of Business at Duke University

Term of the Day


Order ticket that shows the stock, price, number of shares, type, and account of the order. Origin: Practice of placing the ticket on a metal spike upon execution or cancellation. Spike is also a... Read More

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