Congress targets Big Tech's ad-market conflicts with forced breakups

What it does

This bill amends the Clayton Act to break up conflicts of interest in digital advertising by prohibiting large companies (over $20 billion in annual digital ad revenue) from simultaneously owning a digital ad exchange, a buy-side broker, and a sell-side broker, or from owning brokers while also buying or selling ads themselves. Companies over $5 billion in ad revenue must act in customers' best interests, execute trades at the best available prices, disclose detailed transaction data on request, maintain firewalls between business units, and publicly report their order-routing practices quarterly. The bill creates a private right of action for harmed customers and an Antitrust Consumer Damages Fund for settlements.

Why we flagged it

The bill's core mechanism is structural separation and fiduciary duties for large digital ad intermediaries, enforced through divestiture requirements and private litigation. It is fundamentally an antitrust measure targeting conflicts of interest in a concentrated market.

What the text implies

• The $20B and $5B revenue thresholds are indexed to inflation annually, meaning the scope of covered entities may expand or contract over time without further legislative action, creating a moving target for compliance.
• The 'best interest' and 'best execution' duties are borrowed from securities law (FINRA rules) but applied to a less-regulated market; litigation will likely turn on how courts interpret these fiduciary standards in the ad-tech context, creating years of uncertainty.
• The private right of action with statutory damages of $1M per month of violation (or actual damages, whichever is greater) may incentivize class actions against brokers, potentially creating significant liability exposure even for technical or minor breaches.
• The Antitrust Consumer Damages Fund creates a novel mechanism where the AG collects damages on behalf of injured parties and distributes them, but unobligated balances revert to the general Treasury after 10 years—creating pressure to spend or distribute quickly.
• The requirement to synchronize clocks to within 2 milliseconds of NIST atomic time is technically demanding and may impose significant infrastructure costs on smaller brokers, potentially raising barriers to entry.

Section numbers refer to the bill text the analysis read — linked under Primary records below.

Who it affects

The bill directly addresses structural conflicts of interest that harm advertisers and publishers by forcing transparency, best-execution duties, and structural separation in a concentrated market. Ordinary citizens benefit through lower ad costs (better execution), more honest pricing, and stronger remedies when brokers self-deal. The private right of action and damages fund shift power from large platforms to injured parties.

Who stands to gain

• advertisers and publishers (through better execution and lower fees)
• antitrust plaintiffs' bar (private right of action creates litigation opportunity)
• smaller digital ad brokers (reduced competition from vertically integrated giants)

Named in the bill

Clayton Act, Attorney General, State attorneys general, Digital advertising exchanges, Buy-side brokerages, Sell-side brokerages, Antitrust Consumer Damages Fund, National Institute of Standards and Technology (NIST), Department of Labor, Antitrust Civil Process Act

Where it stands

7 cosponsors: 5 Democrats, 2 Republicans.

• Mar 13, 2025 — Introduced · Congress.gov: “Introduced in Senate”
• Mar 13, 2025 — Referred to Senate Committee on the Judiciary · Congress.gov: “Read twice and referred to the Committee on the Judiciary”

Dates and quoted wording are Congress.gov's action record; the timeline shows status changes, not every procedural step.

Money around this bill

5 lobbying clients named this bill on 8 disclosure filings across 2 quarters, Dec 2025 to Jun 2026. Those filings disclosed $4,940,000 in lobbying spend. A filing names 10 bills on average, so that figure is what each filing reported, not a share belonging to this bill.

More lobbying clients named this bill than 78% of bills with at least one filing.

Mike Lee, the sponsor, reported $241,000 in PAC receipts in the 2026 cycle.

• Google Client Services LLC — $3,570,000 on 1 filing
• AFL-CIO — $760,000 on 1 filing
• News Corporation — $400,000 on 2 filings
• Computer & Communications Industry Association — $120,000 on 2 filings
• Google Client Services — $90,000 on 2 filings

Lobbying Disclosure Act filings through Jul 20, 2026. A filing shows who paid to lobby on a bill it names, not what changed.