Schedule 13D
An SEC filing required when any investor acquires more than 5% of a public company's shares, disclosing their identity and intentions.
What is Schedule 13D?
Schedule 13D (also called a 'beneficial ownership report') is an SEC filing required under Section 13(d) of the Securities Exchange Act of 1934 when any person or group acquires beneficial ownership of more than 5% of a publicly traded company's voting shares. The filer must disclose their identity, the number of shares owned, the source of funds used for the purchase, and crucially, their purpose and plans — whether they intend to be a passive investor or seek to influence management, pursue a merger, or acquire the whole company. The filing must be made within 10 calendar days of crossing the 5% threshold. Schedule 13D filings are closely watched by investors as early signals of activist campaigns, potential takeovers, or strategic interest — any of which can drive significant stock price movements.
Example
In January 2024, activist investor Elliott Management filed a Schedule 13D disclosing a $1 billion stake in Honeywell International and demanding the industrial conglomerate separate its aerospace and automation businesses. The filing publicly revealed Elliott's plans and intentions — as required by law — and immediately triggered a 3.5% stock jump as investors anticipated a potential restructuring. Elliott's 13D also revealed it had been quietly accumulating shares over months before crossing the 5% disclosure threshold.
Source: SEC EDGAR — Schedule 13D Filings