7.5% and 15%: The Two Lines a Board Facing an Activist Should Brace For
Published 2026-10-28Author/calculation Beluuga AI Research Team
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Your share price has been drifting higher for months with no news to explain it. Then one morning a large shareholding report lands in the public filings under the name of a well-known activist, and the office goes into a tailspin. For anyone running a listed company, or working in its corporate planning, finance, PR or IR teams, this is the nightmare scenario.
This third article in our series on activist behavior follows the activist from the day it appears to the day it leaves, tracking the stake along the way. What does it mean when the stake climbs to 7.5%, to 10%, to 15%? And which exits do activists actually use?
The data is the large shareholding reports and amendments filed over the past five years by the 27 funds tracked on beluuga.ai's Activist Watch. As in Part 2, we lined up the filings for the same 474 (fund, company) pairs in order and examined, stage by stage, what happened next.
Of the 474 pairs, just over half, 246 pairs (52%), were still held as of October 23, 2026. The other 228 (48%) had been sold down, and for the 200 of those where the filings reveal the route out, we examined which exit they took.
How do activists exit, and what should management brace for?
CONCLUSIONS
1.Start with the fact that activists are remarkably persistent. Of the 474 pairs over roughly five years, more than half, 246 pairs (52%), were still held as of October 2026, and one third of those (86 pairs) are now in a standoff of more than three years. The longer a position has been held, the worse it has done: 29 of the 31 pairs held three years or more are behind TOPIX, yet they are still holding. In more than half of all cases, management should expect dialogue with a large shareholder to become a permanent fixture, with no clear winnerDetails.
2.An activist's stake becomes public once it crosses 5%, but in two out of three cases the activist goes on to buy up to 7.5%Details. Assume from day one that, having shown up, it will keep buying to 7.5%.
3.Above 7.5%, the on-market exit starts to close. 7.5% is a real threshold: past it, the share of exits completed through on-market sales halves from 28% to 13%, and the holding period stretches from a year to a year and eight monthsDetails. For the activist, 7.5% is in practice the last point at which it can still turn back, and whether to go further is a major decision on its side too.
4.If the stake then falls by a point or more, the wind-down has begun. Seven in ten activists that sell part of a position never buy it back; they keep going until they are outDetails. The end is in sight.
5.If instead the activist keeps buying to 10% and becomes a "major shareholder" under the Financial Instruments and Exchange Act, the law itself narrows its exit. Profit on any round trip within six months must be returned to the company (Article 164), so an early departure becomes difficult. Management should prepare for a long campaignDetails.
6.At 15%, the point of no return has been reached. The activist will not, and cannot, turn back. In our observation period, of the 107 pairs whose stake ever reached 15%, 35 have exited, and none of them did so through on-market sales aloneDetails. From here it becomes an all-out contest that pulls in third parties.
7.What follows is a fierce fight over who takes the activist's block, and how. The company brings in a white knight, the activist brings in a buyer, or the company buys the block itself. For the activist this is the endgame in which it locks in its profit, and it will attack with everything it has. The landing it wants, the one that pays best, is to sell the whole block to a third partyDetails.
8.When a third party does step up to buy the block, the odds of delisting become very high. Of the 39 companies whose activist sold the block to a third party, 26 (67%) were subsequently delisted, and 23 of those went through a tender offer. The buyer was most often lined up by the company itself (the board or management), in 15 cases, while the activist found the buyer or became the buyer in only 2Details.
9.If no third-party buyer ever materializes, some companies buy the block back themselves. The price is usually set the same way as the TSE's ToSTNeT-3, at the previous day's close, so there is little in it for the activist, and this looks like the lowest-returning route of all (10.1 points a year below TOPIX). From management's seat, every company that ended this way kept its listing: cash went out, but you outlasted themDetails.
10.If no third party buys and the company does not either, the activist has to choose between exiting and sitting tight to wait for circumstances to change (see conclusion 1). If it exits, a stake of 15% or more has in practice lost the option of piecemeal on-market sales, so the activist is left selling off-market a little at a time. That takes about seven months of intermittent selling, and the activist's return is a weak 8.5 points a year below TOPIX. For management, this is the ending you can call holding the lineDetails
The common assumption is that a listed stock can be sold at any time. The record says otherwise: once an activist's stake passes 15%, there is a real risk that the fund itself ends up with nowhere to go.
Where the 474 pairs seen over five years stand today, and the exit routes of the 200 exited pairs whose disposals could be traced
Observation period: large shareholding reports and amendments filed from September 9, 2021 to October 23, 2026. The left-hand column shows where the 474 pairs stood on October 23, 2026. The third column is the group stake (including joint holders) at the start of the exit. Delisted / still listed at the right is counted in pairs; a company may have more than one fund in it, and by company 34 of 174 issuers were delisted.
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About the data
Period covered
September 9, 2021 to October 23, 2026 (about five years). Large shareholding reports and amendment reports (document type codes 350 and 360) among public filings, taken directly from the structured XBRL data.
Cut-off
The filing ledger is as of October 26, 2026 (filings through October 23). Delisting status is as of October 26, 2026 and may change with later delistings.
Universe
Same as Part 2. For the 27 funds on beluuga.ai's Activist Watch, we collected the large shareholding reports and amendments among public filings from September 9, 2021 to October 23, 2026: 503 pairs (414 companies), less 26 positions opened after a tender offer had already been announced and 3 where merger talks through a share exchange or share transfer were already under way, leaving 474 pairs (391 companies).
The 228 pairs with an exit signal
Pairs whose stake fell to 5% or below. Once below 5% the reporting obligation lapses, so nothing further can be observed. "Fell to 5% or below" does not mean "sold out completely"; it includes positions still held in the 4% range.
Exit route classification (200 pairs)
From the disposal detail in the filings, each pair gets one label, in this order of precedence: tendered to the issuer (share buyback), block sale to a third party such as an operating company, transfer within the same fund group, via a broker, off-market with no counterparty stated, on-market only. Where a pair has several disposal filings, we use the most informative counterparty. The 28 pairs (12%) whose disposal detail could not be read are excluded from the denominator. In the chart, the first four categories, where the counterparty is known, are grouped as "counterparty disclosed". On-market versus off-market follows the filer's own description; TSE off-auction trades (ToSTNeT) are counted as off-market because every filer described them that way.
Matching against buyer-side filings (84 pairs)
For each filing in which the activist cut its stake, we searched all large shareholding reports and amendments filed over the five years (about 75,000) for a filing on the same issuer by a different filer (distinguished by filer code, excluding the activist and its joint holders) from three days before to 45 days after the reporting trigger date. The window runs to 45 days because financial institutions file under a special regime with twice-monthly record dates and later deadlines. A filing in the same window does not necessarily mean that filer took the activist's shares.
Grouping by peak stake
The 474 pairs are grouped by the highest stake reached up to that point.
Share price after exit
For issuers still listed, "during disposal" runs from the filing that began the exit to the reporting trigger date of the filing that took the stake to 5% or below. We then take the share price change over 125 and 250 trading days from the date the stake reached 5% or below and subtract the change in TOPIX over the same period. Prices and TOPIX are closes through October 23, 2026; pairs whose window had not closed by then are excluded. Delisted issuers drop out because their price series ends, so most block sales to third parties are not in this tally. Dividends are not included.
Stake at the start of the exit
With the filings in order, the stake at the start of the last uninterrupted run of reductions that ended at 5% or below. If the activist added to its position at any point before that run, the stake after that addition is the starting point. 7.5% and 15% are not statutory thresholds; they are the levels at which the exit routes diverged when the pairs were banded by stake.
Whether a stake could be sold on-market
Shares held at the start of the exit divided by 20% of average daily volume over the preceding 60 trading days, tested against a 60-trading-day limit. Pairs without a price history (including most that ended in delisting) are excluded, leaving 147 of the 200 pairs. Price histories are split-adjusted, so pairs with a stock split after the starting point are overstated (pairs over 500 trading days are excluded from the median).
Disposal prices
Unit prices in the "acquisitions and disposals in the last 60 days" table of the amendment report, compared with the close on the trading day before. Price histories are split-adjusted while filed prices are as of the time, so rows more than 50% away from the previous close are excluded as split effects. Issuer buybacks are read from the rows naming the issuer as counterparty, taking the largest row per pair. The three self-tender offers are compared with the close on the trading day before the board resolution, as in the tender offer statement, because the filed trade date is the settlement start date and the price was fixed before announcement.
Subsequent delisting
Judged per issuer (de-duplicated) by the listed flag in beluuga.ai's master of domestic listed companies. Rows remain in the master for three years after delisting, so we use the flag rather than the row's presence. We do not distinguish the reason for delisting (tender offer, share exchange, etc.). Where several funds took different exit routes from one company, it is counted once in each route.
Holding period and activist return
Days from the first large shareholding report to the last filing (to the delisting date for delisted companies). The return takes total acquisition cost divided by shares held, as reported in the XBRL, as the activist's cost basis, annualizes the ratio to the exit price (the share price on the date of the last filing, or the tender offer price where the exit was into a tender offer), and compares it with TOPIX annualized over the same period; dividends are not included. Calculated on the 111 pairs where entry was observed, both prices were available, and the exit was observed. These are estimates from the filings and will not match actual realized profit or loss, which depends on interim trades and dividends.
Pairs still holding
The 246 of the 474 pairs in the ledger with no exit signal as of October 23, 2026. Holding period runs from the first large shareholding report to October 23, 2026 and is counted only for pairs whose entry was observed. The unrealized return annualizes the ratio of the cost basis (total acquisition cost divided by shares held) to the latest close through October 23, 2026, compared with TOPIX over the same period, on the 175 pairs where both are available (dividends excluded). "Still below peak" means the latest filing shows a stake at least one point below the highest group stake (including joint holders) reached so far. "No filing for 1+ year" means 365 days or more from the latest filing's reporting trigger date to October 23, 2026.
Buying again after a cut
With the filings in order of reporting trigger date, a filing where shares held fell from the previous filing and the group stake (including joint holders) fell by one point or more counts as a "cut", and one where shares held rose and the stake rose by one point or more as "bought again". Filings where only the percentage moved (dilution from a capital increase, or an increase from the issuer cancelling treasury shares) are not counted. The size of the cut compares the stake in the first cut filing with the peak stake to that point. Trades below 5% do not appear in filings, so only buying back above 5% registers as buying again.
Stake versus voting rights
Stake in this article is the holding ratio in the large shareholding report (which includes potential shares and uses total shares issued, including treasury shares, as the denominator). It may differ from the voting-rights ratio used to determine major-shareholder status. The short-swing profit rule (Article 164 of the Financial Instruments and Exchange Act) also carries statutory exemptions.
Limitations
Filings record what happened, not why. The link between exit route and delisting is a sequence of facts that occurred together, not evidence of which caused which. The company's reasons for a buyback, the negotiations behind a block sale and the path to delisting are better described in the parties' own disclosures. The conclusions describe a stance for management drawn from observed patterns; they do not predict how any individual situation will play out.
beluuga.ai builds data on Japanese listed companies every day from public filings. Activist holdings are on Activist Watch and live tender offers on the Tender Offers list, both open without login.
Written and calculated by: Beluuga AI Research Team
This analysis was produced by the research team at Beluuga AI, Inc., the company that develops and operates beluuga.ai. We collect and verify financial, share price and shareholder data on roughly 3,800 Japanese listed companies in-house.
This article describes facts recorded in public filings, not causal relationships. It does not evaluate the conduct of any particular company or fund, nor does it predict future developments. It does not recommend investing in any specific company and should not be relied upon as the basis for any investment decision. Please make your own investment decisions at your own responsibility.