Nidec's Founder Loses Nearly $1 Billion as the Accounting Catches Up
Published October 24, 2026
Shares in Japanese motor maker Nidec fell to their lowest in a decade in October 2026 after an outside committee found founder Shigenobu Nagamori and other executives bore civil liability for years of improper accounting. Bloomberg reports the slide, down 38% since late September, has wiped at least $978 million from Nagamori's fortune, leaving it at about $3.3 billion.
In October 2026, shares in Nidec, the Japanese company that grew into the world's largest maker of precision motors, fell to their lowest level in a decade. The immediate trigger was a report from an outside committee, and the personal cost landed on the man who built the company. Bloomberg reported that the slide has wiped at least $978 million from founder Shigenobu Nagamori's fortune, reducing it to about $3.3 billion. Nidec stock makes up almost half of that fortune, including shares held through asset-management firms under his control, so when investors lost faith in the company's numbers, they took his wealth with them.
Nagamori, 82, is one of Japan's most famous founder-managers. He built Nidec from nothing into a supplier whose small motors sit inside everything from hard drives to electric vehicles, and he ran it with a famously demanding style, setting hard profit targets for hundreds of subsidiaries. That style is part of the story now. When managers are told they must hit a number, and the number cannot be hit honestly, some of them find another way to hit it. The committee's findings suggest that is what happened at Nidec, over years rather than months.
The committee, made up of outside lawyers and certified public accountants and formed in March, concluded that Nagamori and other current and former executives, including former chief executive Mitsuya Kishida, bear civil liability for damages linked to years of improper accounting. Bloomberg described the finding as widespread fraud in its coverage of the committee's work. Nidec said it may pursue legal action as it restates its financial results, and a shareholder derivative lawsuit has already been filed seeking 28.7 billion yen in compensation. The Financial Times reported that Nagamori blocked a push for an external accounting probe as far back as 2017, into questionable assets worth 22 billion yen.
The accounting damage is large enough to rewrite the company's recent history. A restatement means Nidec must go back and correct parts of its financial record, which delays clarity on profits, cash flow, and debt, the very figures investors use to value a business. The company's auditor, PwC Japan, has refused to sign off on its accounts, and the Tokyo Stock Exchange has placed the company under a special alert that can precede delisting. Write-downs concentrated in the electric-vehicle motor business pushed the company to a multi-billion-dollar loss for the year ended March 2026, wiping out years of accumulated profit in a single reckoning.
The market's reaction has been swift and unsentimental. Nidec's shares are down 38% since late September, and on the Monday after the committee's findings, they fell 2.8% to 1,760 yen, their weakest level since 2016. The company's largest shareholder, activist fund Oasis Management, has called for a review of privatization options, a remarkable position for the biggest owner of a company its founder still dominates. The message from the market is that a motor business can keep selling motors while investors refuse to pay full price for it, because they no longer trust the numbers describing it.
Nagamori's loss carries a lesson that applies well beyond one Japanese manufacturer. Founder control is a genuine asset when it means focus and speed, but it becomes a liability when it means nobody inside the company can challenge the founder's numbers. Accounting is the system that is supposed to catch that failure, and at Nidec it was overridden for years. The $978 million did not vanish because the motors stopped working. It vanished because trust, once repriced, is the most expensive thing a company can lose.
The lesson: When a founder's control outruns a company's controls, the accounting eventually catches up with both.
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