Two of the world's largest offshore energy construction companies are a step closer to becoming one, after US antitrust regulators effectively cleared the way for the deal.

Saipem, an Italian engineering giant, and Subsea7, its Norwegian rival, announced Friday that the mandatory waiting period under US antitrust law had expired without a government challenge. That expiration means the companies can now legally close their merger inside the United States. A handful of regulatory approvals outside the US still need to come through before the deal is fully complete.

What the antitrust clock means

When two large companies plan to merge, US law requires them to notify federal regulators and wait a set period, typically 30 days, before closing. Regulators use that window to decide whether the combination would hurt competition enough to block or modify the deal. If they don't act before the clock runs out, the companies get a green light, at least in the US. That is what happened here.

The clearance matters because the United States is one of the world's largest markets for offshore oil and gas services, the engineering and construction work that keeps deepwater rigs operating and builds the subsea pipelines and infrastructure that bring fuel to the surface.

Why this deal is worth watching

Saipem and Subsea7 together would form one of the most powerful players in a sector that touches energy supply across the globe. Offshore oil and gas production has surged in recent years, particularly in places like Guyana, Brazil, and the Gulf of Mexico, driven by a combination of high energy prices and the gradual decline of easy onshore reserves. The companies that design, build, and maintain the infrastructure for that production operate in a relatively concentrated market, meaning a major merger reshapes who has leverage over contracts, pricing, and hiring.

For ordinary people, the connection is indirect but real. Offshore energy services companies sit a few steps back in the supply chain from gasoline prices, utility bills, and heating costs. When the market for building and maintaining offshore infrastructure is healthy and competitive, energy companies tend to get better prices on big projects, which can translate, over years, into modestly lower energy costs downstream. Conversely, if a merged giant uses its scale to push prices up, that pressure eventually moves through the system.

The more immediate stakes land on workers. Both companies employ tens of thousands of engineers, divers, project managers, and skilled tradespeople across Europe, the Americas, and Southeast Asia. Mergers of this type historically produce efficiency-driven restructuring, which is the corporate phrase for consolidating overlapping teams and cutting headcount in certain regions. Whether and where those cuts fall will depend on how the combined company structures itself after the deal closes.

For now, the remaining regulatory approvals outside the US are the last formal gate. The companies have not disclosed which specific jurisdictions are still pending, but deals of this scale typically require sign-off from competition authorities in the European Union, the UK, and sometimes other markets where either company holds a significant presence. European regulators in particular have shown a willingness in recent years to impose conditions on large industrial mergers, sometimes requiring asset sales or operational restrictions before approving a deal.

The US clearance removes one of the biggest single uncertainties. What comes next depends on how quickly the remaining regulators move, and whether any of them decide the combined company is simply too large to operate without conditions attached.