The Trump administration’s relaxed stance on dealmaking has pushed a "complexity premium" for merger arbitrage investors, with premium returns rising to about 60% on deals subject to antitrust, national‑security, or political scrutiny versus 25% in the previous five years nguy. New research by hedge fund Davidson Kempner shows that potential returns have climbed 2.5 percentage points since 2021, translating to hundreds of millions of dollars for investors who correctly time blockbuster deals.

Recent megadeals illustrate the trend. Pentwater Capital earned a windfall betting that Nippon Steel’s $15bn acquisition of US Steel would close, while pending transactions include Electronic Arts’ $55bn leveraged buyout and Paramount’s $111bn takeover of Warner Bros Discovery. The volatility in target shares during prolonged reviews underscores the risk‑reward calculus of the strategy.

Regulatory complexity now spans U.S. federal and state authorities, the European Commission, and foreign regulators in Brazil, China and beyond. The share of megadeals facing foreign review jumped from 11% to 40% in the last five years, according to Davidson Kempner. Microsoft’s $75bn purchase of Activision Blizzard required 21 months of regulatory negotiation, demonstrating that buyer commitment and remedy negotiations can tip the scales.

For investors, the higher premium fuels continued arbitrage activity, but the expanding web of approvals raises transaction costs and prolongs uncertainty. Business leaders must prepare for lengthier integration timelines and negotiate remedies proactively to secure deal completion and shareholder value.