Why Is Nidec Stock Sliding Today? ¥1 Trillion Impairment Report Explained
Nidec Corporation (TSE: 6594) is under intense selling pressure after reports that the Japanese motor maker could face a ¥1 trillion ($6.3 billion) impairment charge linked to its accounting problems. Reports also said the company's board had moved to remove President and CEO Mitsuya Kishida.
Nidec shares fell 17.6% to ¥2,340 on September 28, hitting the Tokyo Stock Exchange's daily downside limit, according to Investing.com. The decline came as investors reacted to the reported size of the potential impairment and the leadership uncertainty surrounding the company.
However, an important distinction is needed: Nidec itself said on September 28 that no decision had been made regarding the reported CEO dismissal or a ¥1 trillion impairment. The company said it would promptly disclose any material facts requiring disclosure.
That makes the upcoming disclosures especially important for investors.
Why Is Nidec Stock Falling?
The immediate trigger was a report by Japanese financial publication Diamond Online that Nidec was considering a roughly ¥1 trillion impairment charge for the fiscal year ended March 2026.
An impairment charge is an accounting recognition that an asset or investment is worth less than previously recorded. It does not necessarily mean the company is paying ¥1 trillion in cash, but a charge of this size can materially reduce reported earnings and shareholders' equity.
The reported amount would be several times larger than the ¥250 billion impairment figure Nidec had previously indicated, according to market reports.
For investors, the potential size matters because it could substantially change Nidec's reported financial position for FY2026.
But the figure remains a reported possibility rather than a confirmed final charge. Nidec's own disclosure said no decision had been made at that point.
CEO Resignation Report Adds to Investor Uncertainty
The second major catalyst is the reported leadership change.
Reuters reported that Nidec President and CEO Mitsuya Kishida was set to resign, citing Japan's Nikkei business daily. The report did not provide a reason for the expected resignation.
The timing is particularly sensitive because Nidec is already undertaking a major restructuring of its accounting and governance systems.
A sudden change at the top can create uncertainty over strategy, financial reporting, management accountability and the pace of the company's recovery.
Again, however, investors should distinguish the media report from confirmed corporate action. Nidec's September 28 response said that no decisions had been made concerning the reported dismissal and impairment.
The Bigger Problem: Nidec's Accounting Scandal
The latest sell-off did not emerge in isolation.
Nidec has been dealing with a prolonged accounting crisis after an independent investigation identified multiple cases of improper accounting across the group.
Nidec's own disclosures say the investigation found cases involving the avoidance of recording expenses and overstatement of profit, among other accounting misconduct. The company has been working to correct past financial statements and strengthen its internal controls.
The company has also acknowledged that the investigations could have a material and pervasive impact on its consolidated financial statements if additional misstatements are identified.
That history explains why investors reacted so strongly to a report of another potentially huge impairment.
The market is not simply evaluating one accounting entry. It is trying to determine how much confidence can be placed in Nidec's previously reported financial figures and asset values.
Why the ¥1 Trillion Impairment Report Matters
The potential ¥1 trillion charge is important for three reasons.
First, it could significantly reduce reported profit for the fiscal year ended March 2026.
Second, a large impairment could indicate that some businesses or assets are worth substantially less than previously assumed. The Financial Times reported that the potential charge could include around ¥600 billion related to reassessed asset values and about ¥300 billion associated with corrections of accounting irregularities, although these figures came from reporting about a potential charge rather than a finalized company announcement.
Third, it could force investors to reassess Nidec's balance sheet and capital allocation.
The key issue is therefore not merely the headline size of the charge. Investors need to know which assets are being written down, why the valuations changed, and whether further corrections could follow.
Nidec's Financial Reporting Has Already Been Delayed
Another reason the market is nervous is the uncertainty surrounding Nidec's FY2026 financial reporting.
The company previously said that investigations into improper accounting, customs-related matters and other issues were taking considerable time. It had been considering additional impairment losses on goodwill and fixed assets while correcting prior-year financial statements.
Nidec obtained approval to extend the filing deadline for its FY2026 securities report to September 30, 2026.
That deadline is now a major near-term catalyst.
The company's forthcoming filing could provide investors with more clarity on the actual size of accounting adjustments, impairment losses, audit conclusions and the company's financial position.
Nidec Has Been Trying to Rebuild Its Governance
Nidec is not ignoring the problems.
The company says it has been implementing a revised improvement plan aimed at strengthening organizational diversity, transparency, internal controls and corporate culture.
Its April investigation response said the company intended to eliminate the previous management system and implement comprehensive reforms.
Nidec has also established committees and external investigations covering accounting and quality-related issues.
The scale of the quality investigation is another indication of how broad the company's governance challenge has become. Nidec said that more than 1,000 potential inappropriate quality-related cases had been identified by May 13, 2026, mostly involving material, process or design changes made without customer checks. The company said it had not identified issues that immediately affected product functionality or safety at that point.
This does not mean all those cases translate into financial losses. But it adds another layer of operational and governance risk.
What About Nidec's Underlying Business?
Nidec remains a major global motor manufacturer with exposure to automotive, industrial equipment, electronics and other applications.
Its long-term opportunities include motors and components used in electric vehicles, automation and other industrial applications. The company has also been developing technologies related to data-centre infrastructure and AI-related cooling systems.
Importantly, Nidec's May 2026 quality investigation presentation said no inappropriate conduct had been identified in its industrial, infrastructure and machinery products at that stage, while its AI liquid-cooling system business was also reported as having no identified inappropriate conduct.
That distinction matters. The current stock pressure is primarily connected to accounting, governance and financial-reporting uncertainty, rather than a newly announced collapse in demand for Nidec's motors.
Nevertheless, prolonged governance problems can affect customer relationships, financing conditions, management attention and the company's ability to pursue acquisitions or investments.
Delisting Risk Remains a Key Issue
Nidec's problems have also created concerns about its Tokyo Stock Exchange listing.
Market reports have highlighted the possibility of delisting as the company works through its accounting issues and delayed reporting. Nidec's reporting delays and audit-related uncertainty have therefore become important issues for shareholders beyond the size of any individual impairment charge.
A delisting is not the same thing as bankruptcy, but it can materially affect liquidity, investor access and the way a company is traded and valued.
Investors should therefore wait for confirmed exchange and company disclosures rather than treating media speculation as a final outcome.
What Investors Should Watch Next
Several developments could determine Nidec's next major move:
1. FY2026 securities report: The September 30 filing deadline is the most immediate event to watch.
2. Actual impairment amount: Investors need to see whether the reported ¥1 trillion figure becomes a confirmed accounting adjustment.
3. Audit opinion: The auditor's conclusions will be critical for rebuilding confidence in Nidec's financial statements.
4. CEO and board changes: Any confirmed leadership transition could influence the company's reform strategy.
5. Further accounting corrections: Additional restatements or impairments would extend the uncertainty.
6. TSE status: Investors should monitor any official developments concerning Nidec's listing status.
7. Operating performance: Once the accounting picture becomes clearer, attention should gradually return to automotive motors, industrial motors, data-centre infrastructure and other core businesses.
Bottom Line
Nidec stock is under heavy pressure because investors are reacting to reports of a potentially ¥1 trillion impairment charge and a possible CEO change amid the company's continuing accounting and governance crisis. Shares fell 17.6% to ¥2,340 on September 28, reaching the Tokyo Stock Exchange's daily downside limit.
But the ¥1 trillion charge and CEO dismissal were not confirmed decisions by Nidec as of its September 28 disclosure. The company explicitly said no decisions had been made and that it would disclose material developments when necessary.
The next major test is therefore the company's FY2026 securities report and associated financial disclosures. Investors will be looking for the actual impairment figure, accounting corrections, audit conclusions and clarity on management.
For now, Nidec's stock story is primarily about trust in financial reporting and corporate governance, with the underlying motor business taking a back seat until the accounting uncertainty is resolved.
Follow AIViralHub for more Japanese stocks, global markets, business news and company analysis.
This article is for informational and educational purposes only and should not be considered investment advice.