T° TenderOffer.co
Comparison

Schedule 13D vs Schedule 13G

Both report >5% beneficial ownership. 13D is the long-form for active holders; 13G is the short-form for passive institutions.

Attribute Schedule 13D Schedule 13G
Trigger Acquired >5% with intent to influence control Acquired >5% as a passive investor (no control intent)
Form length Long-form — narrative disclosure of background, purpose, plans Short-form — typically 1–2 pages
Filer types Activists, would-be acquirers, founders post-IPO Index funds, ETFs, insurance companies, qualified institutional investors
Filing deadline Within 5 business days of crossing threshold (per 2024 amendments) Within 45 days of year-end (qualified institutions); 5 business days (passive investors)
Amendment trigger 1% change in position 5% change in position (annual update)
Discloses 'purpose' Yes — required narrative on plans / intent No — passive certification is the entire purpose disclosure
Switching Switching from 13G → 13D is a notable signal of activist intent Returning to passive after activism requires switching back to 13G plus a 10-day cooling-off period
Strategic use Foothold for activism, prelude to bear hug or hostile bid Routine institutional disclosure

When the comparison matters

Both filings report beneficial ownership above 5%. The choice between them is the single most-watched signal in shareholder-base monitoring: a fund that switches from 13G to 13D is announcing that it intends to engage actively, often as a prelude to a board contest, a strategic proposal, or a tender offer.

Why the SEC keeps two forms

Forcing every >5% holder to file 13D would be massive overhead for passive index funds that trade purely on benchmark rebalancing. The 13G regime carves out genuinely passive institutions while preserving the activist-disclosure regime that the Williams Act intended.

Guides

Glossary