Effective May 1, 2026

Japan TOB Rule Change 2026: Mandatory Tender Offer Threshold Drops from 33% to 30%

Q: What is changing in Japan's tender offer rules?

The mandatory tender offer threshold is dropping from one-third (approximately 33.33%) to 30% of total voting rights. Additionally, on-market purchases are now covered by TOB requirements for the first time. Previously, accumulating shares through on-market auction trading was exempt from tender offer obligations.

Q: Does the new rule apply to on-market share purchases?

Yes. Previously, only off-market transactions triggered mandatory TOB requirements. Under the amended FIEA, on-market auction trading that causes an acquirer's shareholding to exceed 30% of voting rights will also require a mandatory tender offer.

Q: How does this affect foreign investors building positions in Japanese stocks?

Foreign and activist investors accumulating positions in Japanese companies will reach the mandatory TOB trigger earlier, at 30% rather than 33.33%. The inclusion of on-market purchases means that stake-building through open market trading now carries regulatory obligations.

Q: Why did Japan lower the TOB threshold to 30%?

Japan's Financial Services Agency determined that 30% of voting rights is typically sufficient to block special resolutions at Japanese shareholders' meetings. The 30% threshold also aligns Japan with international norms: the UK, EU member states, and Hong Kong already use 30% as their mandatory tender offer trigger.

Q: What other changes were made to Japan's tender offer regulations?

Beyond the threshold reduction: flexible pricing rules allowing different prices in limited circumstances, expanded withdrawal rights for acquirers, the ability to reduce tender offer prices during the offer period, abolition of the Rapid Accumulation Rule, and reforms to large shareholding reporting to encourage institutional investor engagement.

Published March 26, 2026 · Last updated March 26, 2026 · Pulse News Wire

On May 1, 2026, Japan's mandatory tender offer threshold drops from one-third (approximately 33.33%) to 30% of total voting rights. For the first time, on-market share purchases will also trigger mandatory tender offer obligations. The changes, enacted through amendments to the Financial Instruments and Exchange Act (FIEA), represent the most significant overhaul of Japan's TOB regulations in over a decade and directly affect how foreign investors and acquirers build positions in Japanese listed companies.

What Is Changing

Rule	Before May 1, 2026	After May 1, 2026
Mandatory TOB threshold	One-third (~33.33%) of voting rights	30% of voting rights
On-market purchases	Exempt from TOB requirements	Covered — trigger mandatory TOB above 30%
Rapid Accumulation Rule	In effect (anti-avoidance)	Abolished
Pricing flexibility	Single price required	Limited flexibility for major shareholder discounts
Withdrawal rights	Limited circumstances	Expanded circumstances
Price adjustment	Not permitted during offer	Permitted in certain cases

Legislative Timeline

Date	Event
May 15, 2024	Diet of Japan passes the FIEA amendment bill
July 4, 2025	FSA finalizes implementing regulations (Enforcement Order and Cabinet Office Ordinance)
May 1, 2026	All changes take effect — applies to TOBs with opening announcements on or after this date

Why 30%?

Japan's Financial Services Agency (FSA) determined that at most Japanese listed companies, 30% of voting rights is sufficient to block a special resolution at a shareholders' meeting, which requires a two-thirds supermajority. In many cases, 30% can also significantly influence ordinary resolutions (simple majority). The 30% threshold aligns Japan with international norms: the UK, EU member states, Hong Kong, and most other major markets already use 30% as their mandatory tender offer trigger.

De Minimis Exemption

The 30% rule does not apply if both conditions are met:

The increase in ownership from the purchase is less than 0.5% of total voting rights, AND
No other purchases were made by the acquirer within the six months prior to the purchase date.

Impact on Foreign Investors

Lower trigger point: Position accumulation hits the mandatory TOB threshold at 30% instead of 33.33%, requiring earlier planning for any significant stake.
On-market purchases now regulated: Accumulating shares through open market trading, which previously avoided TOB requirements entirely, now triggers mandatory offers above 30%.
More careful monitoring required: Investors must track their aggregate voting rights position more precisely, especially when approaching the 30% level through multiple transaction types.
Aligned with governance reform: The changes accompany reforms to large shareholding reporting that encourage institutional investor engagement with Japanese companies.

All Changes in the FIEA Amendment

30% mandatory threshold: Replaces the former one-third rule. Any acquisition (on-market or off-market) that causes shareholding to exceed 30% triggers a mandatory tender offer.
On-market coverage: On-market auction trading is no longer exempt. This is the most operationally significant change for active investors.
Abolition of Rapid Accumulation Rule: The anti-avoidance rule preventing structured multi-type transactions to stay below one-third has been removed.
Flexible pricing: Acquirers can now offer different prices in limited circumstances, such as purchasing from a major shareholder at a discount within a single TOB, provided terms are disclosed.
Expanded withdrawal rights: Acquirers have broader grounds to withdraw a tender offer once commenced.
Price adjustment during offer: The tender offer price can be reduced in certain cases, such as when the target distributes dividends during the offer period.
Large Shareholding Reporting reform: The special reporting system for institutional investors has been revised to encourage engagement without fear of losing eligibility for the special reporting regime.

Recent Tender Offer Filings on TDNet

Pulse News Wire translates all tender offer-related filings from TDNet into English, including TOB commencement notices, position reports, target company opinion statements, and results announcements. As of March 2026, our archive covers 265+ translated tender offer filings across 87 companies.

Track All Japanese Tender Offer Filings in English

Pulse News Wire translates every TOB-related disclosure from TDNet within minutes of filing. Monitor commencement notices, position reports, and results across all 4,436 JPX-listed companies.

View All Tender Offer Filings

Frequently Asked Questions

When does the new Japan TOB threshold take effect?

The new 30% mandatory tender offer threshold takes effect on May 1, 2026. It applies to tender offers whose opening announcements are made on or after that date. The FIEA amendment was passed by Japan's Diet on May 15, 2024, with implementing regulations finalized by the FSA on July 4, 2025.

What is changing in Japan's tender offer rules?

The mandatory tender offer threshold drops from one-third (approximately 33.33%) to 30% of total voting rights. On-market purchases are now covered by TOB requirements for the first time. Previously, accumulating shares through on-market auction trading was exempt. Under the new rules, any acquisition method that pushes ownership above 30% triggers a mandatory tender offer.

Does the new rule apply to on-market share purchases?

Yes. This is one of the most significant changes. Previously, only off-market transactions triggered mandatory TOB requirements. Under the amended FIEA, on-market auction trading that causes an acquirer's shareholding to exceed 30% will also require a mandatory tender offer.

Are there any exemptions from the 30% rule?

Yes. A de minimis exemption applies: the 30% rule does not apply if the increase in ownership is less than 0.5% AND no other purchases were made by the acquirer within the six months prior to the purchase date.

How does this affect foreign investors building positions in Japanese stocks?

Foreign and activist investors will reach the mandatory TOB trigger earlier, at 30% rather than 33.33%. The inclusion of on-market purchases means that stake-building through open market trading now carries regulatory obligations. Investors must monitor their positions more carefully and plan acquisition strategies around the lower threshold.

Why did Japan lower the TOB threshold to 30%?

The FSA determined that 30% of voting rights is typically sufficient to block special resolutions at Japanese shareholders' meetings. The 30% threshold also aligns Japan with international norms: the UK, EU, and Hong Kong already use 30% as their mandatory tender offer trigger.

What other changes were made to Japan's tender offer regulations?

Beyond the threshold reduction: flexible pricing rules, expanded withdrawal rights, the ability to reduce tender offer prices during the offer period, abolition of the Rapid Accumulation Rule, and reforms to large shareholding reporting to encourage institutional investor engagement.

Where can I find English translations of Japanese tender offer filings?

Pulse News Wire translates all tender offer-related filings from TDNet into English, including TOB commencement notices, position reports, opinion statements, and results announcements. All filings are available at pulsenewswire.com/tender-offers/ and are typically published within minutes of the original Japanese filing.

Sources and Further Reading

Last updated: March 26, 2026