Business dealsDemand boost for combustion cars prompts target's request to cancel agreementNiterra, the manufacturer of NGK spark plugs, would have taken control of more than half of the global market if the acquisition had gone through. (Photo by Ryohei Shimizu)October 3, 2026 01:28 JSTNAGOYA, Japan -- Japanese automotive parts supplier Niterra canceled its planned acquisition of domestic rival Denso's spark plug and exhaust gas sensor businesses, the companies said Friday, at Denso's request due to changes in the market.