Should You Piggyback on Hikari Tsushin's Japanese Small-Cap Stakes?

This note examines public large-shareholding filings and share prices. It does not recommend buying or selling any security.

Amounts in this note are in US dollars, converted from yen at ¥157.67 = $1, the mid-market rate on October 2, 2026 (the last share-price date in the data).

The question

Hikari Tsushin (TSE: 9435) runs one of the busiest stake-building operations in the Japanese market. Through Hikari Tsushin itself and a set of affiliated vehicles, including UH Partners 2, UH Partners 3 and SIL, the group filed 677 large-shareholding reports on 228 companies between July 29, 2025 and October 2, 2026. Over the same period, the 27 activist funds beluuga tracks filed 1,230 between them.

Investors who watch these filings sometimes ask whether it pays to buy alongside Hikari Tsushin. Our answer is no. The group does not trade mispricings. It keeps buying as prices fall and accumulates the earnings and voting power of companies it intends to keep. Measured against comparable stocks, buying after its filings has earned roughly nothing.

What the filings show

Fifty of the 677 reports are initial filings, made when the group first crossed 5%. The other 627 are amendment and correction reports; an amendment is required each time a holding moves by one percentage point or more. In 656 of the 677 reports (97%), every filer states its purpose as pure investment (純投資).

The group tends to buy after a stock has fallen. In the 60 trading days before the trade date of its initial filings, the median stock underperformed TOPIX by 9.5%. Before add-on purchases, the median underperformance was 4.5%. The group then keeps adding as the price weakens.

Combined across vehicles, the median group stake is 10.5%. In 119 companies the group holds 10% or more. In 113 of those, every individual vehicle holds less than 10%, and a typical company has three Hikari-affiliated holders. Ten percent is the level at which a single holder becomes a principal shareholder under Japan's Financial Instruments and Exchange Act.

Following the filings has not paid

We assumed an investor buys at the close on the trading day after each filing becomes public and holds for up to 120 trading days. We then compared the result with TOPIX and with stocks most similar to the target, matched on market capitalization, price-to-book ratio and price trend over the previous 60 trading days. Add-on filings are limited to one per company per 20 trading days.

The TOPIX column includes one more filing in each Hikari Tsushin row (30 and 140); in each case one filing lacked the data needed for the matched comparison. Activist filings cover the same window (from July 29, 2025).

Against TOPIX, following Hikari Tsushin lost heavily: about 14% in 120 trading days. Most of that loss comes from what the group buys, not from its timing. Small, cash-rich Japanese companies lagged the large caps that led TOPIX over the period. Against stocks of the same size, valuation and recent trend, the difference shrinks to roughly zero, and it is not statistically distinguishable from zero.

Activist funds' initial filings, measured the same way, were followed by gains relative to similar stocks: a median of 12.5% over 120 trading days. An investor following them also starts later. Filings arrive a median of seven calendar days after the trade, and over that gap activist targets outperformed TOPIX by a median of 6.7%. For Hikari Tsushin's initial filings the move was 2.6%. All of these figures come from a single 14-month market period.

The group's filings also say little about what activists will do. In only four of its 228 companies did an activist fund file an initial report after the group's first filing: CE Holdings (4320), NCD (4783), Icom (6820) and Advanced Media (3773).

What Hikari Tsushin says it is doing

The group explains its approach on a page of its corporate website titled “Net investment overview.” It contrasts itself with a typical fund in the following terms:

From Hikari Tsushin's net investment page (translated)

“Based on the idea that buying shares means owning part of that company's business, we aim to build good relationships with our investees and, as a principle, hold for the long term. In selecting stocks we look for (1) stable businesses and (2) sound financial foundations, and (3) we aim to acquire them at undervalued prices.” Compared with a typical fund: investments are not judged by watching market trends; the holding period has no limit; there is no cap on ownership, and an investee can be run as a consolidated subsidiary; low liquidity is no obstacle; and the key metric is not affected by share-price movements.

That key metric is “look-through operating profit”: each investee's operating profit multiplied by the group's ownership share. The figures the company publishes for its portfolio are shown below.

Source: Hikari Tsushin, “Net investment overview” (yen figures of ¥852.3bn, ¥1,476.4bn, ¥139.9bn, ¥33.6bn and ¥67.7bn, converted at ¥157.67/$).

The return the group measures is the profit it can claim, not the share price. Lower prices let it buy more of that profit for the same money, which explains its willingness to keep buying as prices fall. A minority holder buying alongside it pays the same price but gets neither the earnings consolidation nor the influence.

What it buys

Compared with all Japanese listed companies with a market capitalization of ¥2bn–¥60bn (about $13mn–$381mn), the companies the group reports on are slightly larger, clearly more profitable and much richer in cash. They are not especially cheap.

Small caps exclude companies on which the Hikari Tsushin group has filed. Current values from beluuga.ai financial data as of October 2026.

The theme is easier to see by business type than by valuation. Information and communication companies make up 37.7% of the group's holdings, against 17.9% of small caps; retailers make up 2.2%, against 9.2%. Many of the information and communication names sell software and services to small businesses on a recurring basis, among them Miroku Jyoho Service (9928) and PCA (9629) in accounting software, ATLED (3969) in workflow software, Fukui Computer Holdings (9790) in CAD for builders and surveyors, and e-Seikatsu (3796) in real-estate software. Hikari Tsushin's own operating segments, corporate services and individual services, likewise sell to small businesses and households.

Where it matters: control blocks and tender offers

The group's website says there is no cap on how much it will own. Excluding two listed subsidiaries that are themselves group filers (FTGroup and Premium Water Holdings), it holds 20% or more of 34 companies and more than one-third of seven. Above one-third, a holder can block special resolutions such as mergers and amendments to the articles of incorporation.

Sum of each group filer's latest reported holding as of October 2, 2026. Company pages on beluuga.ai show the largest single filer in each report, so their figures are lower.

Stakes of this size matter when someone else bids. Of the 42 third-party tender offers announced from April to September 2026 in beluuga's tender offer database, eight were for companies on which the group had filed. Eight cases are too few to describe a pattern, so we list them all:

The group has filed on 6.0% of domestic listed companies. beluuga's tender offer database covers announcements from April 2026.

In five of the eight, the group held more than 15%. A block of that size can decide whether a bidder reaches a majority-of-minority condition, or the two-thirds needed to squeeze out the remaining shareholders.

The bottom line

Hikari Tsushin does not look like an investor that harvests market mispricings, and its filings have not been a source of excess return for those who follow them. It buys more as prices fall and steadily accumulates the earnings and voting power of companies whose businesses it understands. A shareholder who simply buys alongside it shares the price risk without the consolidation or the control that make the strategy work for the group.

That does not make the group irrelevant. Where it holds 20% or more, and especially above one-third, it is likely to shape whether a tender offer or buyout succeeds, and at what price. For special-situation investors, Hikari Tsushin is better treated as a variable in those deals than as a signal to follow.

Method. Group filers are matched to filings by normalized filer name, using the same rule as beluuga's activist pages. Group stakes add up each filer's latest holding. Returns use daily closing prices. Similar stocks are the 30 non-target companies closest in market capitalization and price-to-book ratio (both scaled back to the purchase date by the share-price change) and in price change over the previous 60 trading days. Overlapping holding periods for add-on filings overstate their t-statistics.

Prepared for client circulation · Source data: beluuga.ai · This note does not constitute investment advice and is not an offer or solicitation with respect to the securities discussed.