Denso Plans $8.5 Billion Deal to Acquire Rohm and Boost Japan’s EV Chip Industry

Denso Moves to Acquire Rohm in $8.5 Billion Semiconductor Deal

Denso, a major Japanese automotive components manufacturer and part of the Toyota Group, has made a formal offer to acquire semiconductor company Rohm.

The potential deal could be worth around 1.3 trillion yen (about $8.5 billion). Both companies have confirmed that negotiations are underway, although a final agreement has not yet been reached.

Following the announcement, Rohm’s stock surged by about 18%, reaching its highest level in roughly two and a half years.

Goal: Build a Strong Japanese Chip Player

The proposed merger aims to create a major Japanese competitor in the power semiconductor market.

Power semiconductors are essential for modern vehicles, particularly in:

• Electric vehicle power management

• Battery systems

• Autonomous driving electronics

The deal is also seen as a strategic response to growing competition from Chinese EV manufacturers such as BYD, which are rapidly expanding their in-house semiconductor capabilities.

Fragmented Market Limits Japan’s Competitiveness

Japan’s power semiconductor sector is currently highly fragmented, with several companies operating independently. This structure has made it difficult for Japanese manufacturers to achieve the scale needed to compete with Chinese producers on price and production volume.

A combined Denso–Rohm entity could potentially create a more vertically integrated supply chain for the automotive industry.

Government Strategy Supports Industry Consolidation

The proposed acquisition aligns with the Japanese government’s broader strategy to consolidate the domestic semiconductor industry and strengthen its global competitiveness.

Denso already holds around 5% of Rohm’s shares through a strategic partnership.

However, several recent developments accelerated the acquisition talks:

• Rohm recently reported its first net loss in 12 years

• The company’s partnership with Toshiba collapsed

• Market competition in EV power electronics intensified

Potential Vertical Integration in Automotive Chips

If the deal proceeds, Denso would acquire the remaining 95% of Rohm’s shares, creating a vertically integrated structure that covers:

• Semiconductor design

• Chip manufacturing

• Automotive electronics integration

Such integration could give Japanese automakers stronger control over critical EV technologies, particularly as the global shift toward electric and autonomous vehicles accelerates.