M&A重量級トラッカー

The U.S. Department of Justice cleared Paramount Skydance Corp.’s $110 billion acquisition of Warner Bros. Discovery on June 13, 2026, issuing an unconditional approval that ends a month‑long antitrust review and removes the last major regulatory hurdle for the deal.

The clearance came despite a wave of state‑level push‑back. California Attorney General Rob Bonta announced on June 5 that the state was weighing a lawsuit to block the merger, joining a multi‑state coalition that had threatened to sue if the DOJ imposed conditions. Bonta’s office cited concerns that the combined entity would control roughly 30 % of U.S. theatrical distribution and 25 % of streaming subscription revenue, figures derived from a joint‑industry report cited in the AG’s filing. The DOJ’s decision, outlined in a 12‑page statement released to the press, concluded that “the transaction is unlikely to substantially lessen competition” and therefore required no divestitures or behavioral remedies.

Market reaction was swift. Warner Bros. Discovery shares, which had been trading at a $30‑$32 discount to the $81 billion cash‑plus‑stock offer announced in May, jumped 7.2 % to $41.18 in after‑hours trading on the NYSE, according to Bloomberg data captured at 22:15 ET. Paramount Skydance’s ticker rose 5.4 % to $68.90, narrowing the spread between the offer price and the market price to under 2 %. The S&P 500, already within 0.3 % of its all‑time high, edged up 0.4 % on the news, while the Nasdaq Composite added 0.6 %, reflecting broader investor confidence that the media consolidation will not trigger further regulatory drag.

The approval also reshapes the competitive landscape of the U.S. entertainment sector. Prior to the deal, the “Big Six” – Disney, Comcast (NBCUniversal), Warner Bros., Paramount, and Sony – already accounted for 70 % of domestic box‑office revenue. Post‑merger, the combined Paramount‑Warner entity will control an estimated 45 % of theatrical releases and 38 % of streaming subscriptions, according to a Deloitte market‑share model referenced in the DOJ’s analysis. The model projects that the merger will generate $4.5 billion in annual cost synergies, primarily from shared content libraries and joint advertising sales platforms, while also delivering $2.3 billion in incremental revenue through cross‑selling of original series across Paramount+ and HBO Max.

Regulatory precedent suggests that the DOJ’s hands‑off stance may be driven by the broader policy environment. In June 2024, the agency issued new guidance emphasizing “efficiency‑driven” consolidations in media and technology, arguing that scale can foster innovation in AI‑enhanced content creation. The same guidance warned that “excessive divestiture” could hinder U.S. competitiveness against foreign rivals such as Tencent and ByteDance. The Paramount‑Warner clearance appears to be the first high‑profile test of that doctrine, and the DOJ’s language mirrors the “unlikely to harm competition” language used in its 2025 approval of the Microsoft‑Activision Blizzard acquisition.

State‑level risk remains. While the DOJ has spoken, the California AG’s lawsuit, if filed, would proceed in state court under the California Cartwright Act, which permits broader consumer‑welfare considerations than the federal Clayton Act. Legal analysts at Wilson Sonsini estimate that a successful state challenge could delay closing by 90‑120 days and force the divestiture of at least two major studio assets, potentially valued at $3‑4 billion. The AG’s office has not yet filed a complaint, but a filing deadline of July 15 has been set for the coalition’s joint motion, according to a filing notice posted on the California Courts website.

The integration timeline now accelerates. Paramount announced on June 13 that it will commence a 30‑day “integration sprint” beginning July 1, with a target closing date of October 1, 2026. The sprint will focus on consolidating content licensing agreements, harmonizing ad‑tech platforms, and aligning corporate governance structures. A senior executive from Warner Bros. disclosed to Reuters that the combined company plans to launch a unified streaming bundle by Q1 2027, priced at $15.99 per month, which would undercut Disney+ and Netflix’s current offerings.

Implications for other deal flow are immediate. The FTC’s June 7 order requiring Ascension Health to divest seven ambulatory‑surgery centers to complete its $3.9 billion AmSurg acquisition underscores that the agency remains vigilant in sectors where market concentration is less obvious. Analysts at Jefferies note that the FTC’s willingness to impose divestitures in health care, contrasted with the DOJ’s leniency in media, may signal a sector‑specific approach rather than a blanket antitrust tightening.

Moreover, the SpaceX IPO that debuted on June 12 with a record‑setting valuation of $300 billion has shifted capital toward high‑growth technology, reducing the pool of financing available for mid‑size M&A. Yet the same week, Mission Produce completed its $1.2 billion acquisition of Calavo Growers, indicating that “essential‑goods” sectors continue to see consolidation despite higher Treasury yields (the 10‑year yield rose to 4.55 % on June 13, per Bloomberg).

What to watch next:

1. California AG lawsuit filing – deadline July 15; any complaint will likely trigger a federal‑state coordination meeting within 30 days. 2. FTC’s next health‑care review – the agency announced on June 10 that it will open a probe into the $5.6 billion acquisition of Heartland Health by UnitedHealth, with a decision expected by late August. 3. Paramount‑Warner integration milestones – the July 1 “integration sprint” will be reported in a filing to the SEC (Form 8‑K) on July 5; watch for any disclosed cost‑overrun or staffing reductions. 4. Shareholder sentiment – Warner Bros. Discovery’s proxy statement, due July 20, will include a vote on the merger; activist hedge fund Starboard has hinted at a “yes‑but” stance, demanding stronger governance guarantees. 5. International ripple effects – European competition regulators have signaled intent to review the merger under the EU Merger Regulation; a decision timeline of six months was indicated in a European Commission press release on June 9.

The DOJ’s unconditional clearance of the Paramount‑Warner deal marks a watershed moment for U.S. media consolidation, setting a benchmark for how federal antitrust policy will balance scale‑driven efficiency against concentration concerns. As state‑level actions and foreign reviews loom, the next few weeks will determine whether the merger proceeds as a seamless “one‑stop‑shop” for content or becomes a litmus test for a more fragmented regulatory future.