State attorneys general are reportedly organizing to challenge the Paramount-Warner Bros. Discovery merger even after the DOJ gave its blessing — a move that reopens deal-break risk at the eleventh hour. The EU's own review timeline is also running concurrently, adding a second jurisdictional overhang. The combination of state-level antitrust action and foreign regulatory scrutiny means the deal is not nearly as close to done as markets may have assumed after the DOJ sign-off.

WBD is the acquirer in a deal that would combine two of the largest legacy media and streaming properties in the US, with WBD itself reporting $37.3B in revenue for FY2025 — down 5.1% year over year — and a razor-thin 2.0% net margin on $0.29 diluted EPS. That financial backdrop means WBD enters this regulatory gauntlet in a weakened operating position, with little margin for deal-related distraction or cost.

The second-order setup is meaningful: state AG challenges have historically been slow, expensive, and unpredictable. Even if they ultimately fail, prolonged litigation delays close, increases deal costs, and raises the risk of either party invoking termination provisions. For WBD specifically, the revenue decline and thin margins leave little buffer for a deal that drags.

The EU clock adds another dimension — a conditional approval with behavioral remedies could reshape the combined entity's international streaming and content strategy, potentially diluting the synergy thesis. Markets will now need to price in a wider range of outcomes: delayed close, amended terms, or outright collapse.

What to watch: which states file, the specific antitrust theories advanced, whether the EU signals conditional vs. blocked approval, and any commentary from either board on deal financing or termination fee mechanics.