The US SEC has tightened disclosure rules for activist investors, requiring greater transparency around client identities in key regulatory filings. The new guidance could reshape shareholder activism by increasing disclosure obligations for hedge funds and special purpose investment vehicles, while reigniting debate over investor privacy, corporate governance and campaign financing.

SEC expands activist investor disclosure rules: find out if you must switch from Schedule 13G to 13D and what the new guidance means for you.

The US SEC has tightened disclosure rules for activist investors, requiring greater transparency around client identities in key regulatory filings. The new guidance could reshape…