Denso Pulls Plug on ROHM Acquisition Proposal

2026-04-28

Recently, Japanese automotive parts giant Denso has officially considered withdrawing its full acquisition proposal for semiconductor manufacturer ROHM. This deal, valued at up to 1.3 trillion yen (approximately $82 billion), has stalled due to a failure to gain approval from ROHM's board of directors.

Details of the ROHM Acquisition Proposal

Denso Pulls Plug on ROHM Acquisition Proposal

In February of this year, Denso formally proposed a full acquisition offer to ROHM, planning to acquire all of its shares through a tender offer (TOB). If successful, this transaction would have been the largest merger and acquisition deal in Japan's semiconductor industry in recent years. This move was not sudden but was based on a pre-established strategic partnership between the two companies. In May 2025, Denso and ROHM announced a strategic partnership in the semiconductor field, focusing on the joint development of analog semiconductors for devices such as electric vehicle (EV) sensors. As part of this collaboration, Denso initially purchased approximately 0.3% of ROHM's shares and increased its stake to nearly 5% in July of the same year, laying the groundwork for the subsequent full acquisition.

The deep collaboration between the two parties focused on the core of automotive electrification and intelligence—semiconductors. Denso, as the largest parts supplier for the Toyota Group, possesses strong capabilities in automotive system construction, while ROHM has accumulated cutting-edge technology in the consumer electronics and power semiconductor fields. This partnership aimed to integrate the strengths of both sides to enhance the lineup of high-quality semiconductor products for electric vehicles and autonomous driving. Denso's increase in shareholding to nearly 5% was precisely to solidify this capital link and explore possibilities for broader cooperation.

Rejection of the Acquisition and Plan Withdrawal

However, Denso's full acquisition proposal did not gain acceptance from ROHM. ROHM's board of directors established a special committee to evaluate the proposal. By late April 2026, news confirmed that ROHM's board had explicitly rejected this acquisition. As approval from the target company could not be obtained, Denso was forced to consider completely withdrawing this acquisition offer. Although previous analysis suggested that Denso might initiate an unsolicited, hostile tender offer (TOB) if rejected, this option ultimately did not materialize.

New Path for Japanese Power Semiconductor Restructuring

While the Denso acquisition proposal was progressing, another path for restructuring in Japan's power semiconductor industry became clear. On March 27, 2026, ROHM, Toshiba, and Mitsubishi Electric jointly announced that they had signed a Memorandum of Understanding (MOU), planning to merge their respective power semiconductor businesses to establish a new joint venture operating company.

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