US SB1060

Prohibits companies with over $20 billion in annual digital advertising revenue from simultaneously owning a digital advertising exchange and a buy-side or sell-side brokerage, or from owning both buy-side and sell-side brokerages, requiring divestitures within 1 year of enactment

Imposes fiduciary duties on digital ad brokerages with over $5 billion in annual revenue, including "best interest" and "best execution" obligations to act in customers' interests and seek the most favorable transaction terms

Requires transparency disclosures to brokerage customers upon request, including bid data, routing practices, compensation sources, and all transaction records; mandates quarterly public reports on order routing practices

Establishes enforcement through Attorney General civil actions, state attorneys general suits for injunctive relief, and private rights of action allowing harmed customers to recover $1 million per month of violation or actual damages plus attorney's fees

Creates an Antitrust Consumer Damages Fund in the Treasury to collect and distribute damages recovered by the Attorney General, with unclaimed funds reverting to the general fund after 10 years