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Schedule 13D

Also known as: 13D filing, SC 13D, Form 13D, beneficial ownership report

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Schedule 13D is the beneficial ownership report that any person or group must file with the SEC after acquiring more than 5% of a class of a company's registered voting equity, unless they qualify to file the shorter Schedule 13G. It is the filing associated with investors who may seek to influence or control the company.

How it works

  • Deadline: within 5 business days of crossing 5% (shortened from 10 calendar days by the SEC's 2023 amendments, effective 2024).
  • Amendments: required within 2 business days of a material change, including any acquisition or disposition of 1% or more.
  • Key sections: Item 3 (source of funds), Item 4 (purpose of the transaction), Item 5 (holdings and recent trades), Item 6 (contracts or arrangements such as swaps), Item 7 (exhibits, often including letters to the board).

Item 4 is the one to read. It says whether the filer intends to seek board seats, push for a sale, oppose a deal, change capital allocation, or simply holds for investment while reserving the right to act.

Why it matters for traders

A 13D from a known activist investor can lift a stock sharply on the day it appears, because it signals pressure for a sale, buyback, breakup or management change. A 13D from a strategic buyer or a group of insiders can hint at a takeover or a going-private transaction. Amendments matter too: a filer adding a public letter, nominating directors, or selling down can each move the price.

Example

Ironbridge Capital buys 3.1 million shares of Pinecrest Foods (ticker PCFD), which has 50 million shares outstanding, crossing 5% (3.1 / 50 = 6.2%) on Monday. Its 13D is due by the following Monday. Item 4 states that Ironbridge believes the company should explore strategic alternatives, including a sale, and attaches a letter to the board.

FAQ

What is the difference between a 13D and a 13G?

A 13D is for holders above 5% who may seek to influence control. A 13G is a shorter form for passive investors and certain institutions that do not.

How fast must a 13D be filed?

Within 5 business days of crossing 5%, with amendments for material changes within 2 business days.

Track it on Quantisnow

Related terms

Schedule 13GA short-form SEC disclosure for investors who own more than 5% of a company's voting stock but hold it passively, without intent to influence control.Activist investorAn investor who buys a meaningful stake in a public company to push for changes such as a sale, board seats, buybacks or new management.Beneficial ownerA person who has or shares voting or investment power over a security, directly or indirectly, even if the shares are held in another name.Hostile takeoverAn attempt to acquire a company against the wishes of its board, typically through a tender offer directly to shareholders or a proxy fight.Poison pill (shareholder rights plan)A takeover defense that lets existing holders buy discounted shares if an investor crosses an ownership threshold, diluting the would-be acquirer.

Part of the Quantisnow financial glossary. For longer explainers, see the investing guides. Educational content, not investment advice.