Lockheed Martin shares rise as report says it is leading a race to buy Ultra Maritime in a potential $3.5 billion deal

Lockheed Martin’s stock rose by about 4.6% on Thursday, and the move has been tied to reports that the defense contractor is leading a competitive effort to acquire Ultra Maritime, an undersea-defense business owned by private equity firm Advent International. The shares later edged lower in after-hours trading, underscoring how much of the development is still tied to media reporting rather than a confirmed deal announcement.

According to the report circulated in market outlets, Lockheed Martin has emerged as the frontrunner in an auction process for Ultra Maritime, and a transaction could be announced as early as next week. The deal size is described as potentially valuing the naval-defense unit at about $3.5 billion. The reporting also says talks are ongoing and that multiple other bidders remain in the running, suggesting the outcome is not yet settled.

Ultra Maritime is described in the coverage as specializing in anti-submarine warfare and undersea defense technologies. The business is characterized as part of a wider Cobham Ultra group created after Advent acquired British defense company Cobham in 2019 and later combined Cobham’s Ultra Electronics assets into that structure. For Lockheed Martin, acquiring an undersea specialist would fit a broader push to expand capabilities across contested domains where sensing, targeting, and platform survivability are central to modern naval strategy.

The stock reaction highlights how acquisition rumors can quickly change expectations for defense-industry portfolios. Lockheed’s move came alongside the narrative that large defense firms are looking for technology and program adjacency, particularly in areas that support undersea operations. Even if the eventual consideration changes, the report suggests the market is focused on whether Lockheed can secure a specialized undersea-defense platform rather than rely only on organic growth.

While the report names Advent as the owner of Ultra Maritime and frames the process as competitive, it does not describe specific deal terms beyond the approximate valuation and the possibility of a near-term decision. It also does not disclose financing structure, expected timeline from signing to close, or whether any regulatory reviews would be triggered, leaving key transactional details to future confirmation.

Lockheed Martin did not accompany the market reporting with a company statement in the materials reviewed for this story. The most recent official Lockheed Martin newsroom page provides a general hub for releases, but it was not cited as confirming an auction outcome or deal discussions in the reporting that drove the stock move.

Investors and defense watchers will likely focus on two questions if negotiations remain active. First, whether Lockheed can secure exclusivity or reach definitive agreement, which would shift the story from “reported talks” to a deal that can be valued with more precision. Second, how an Ultra Maritime acquisition would integrate into Lockheed’s existing maritime and undersea efforts, including which programs or customer relationships are expected to transfer with the business.