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Suido Kiko Kaisha, Ltd. 6403

Company
水道機工株式会社Suido Kiko Kaisha, Ltd.
Investors
4
Buys
2
Total Value
¥9M ($59K)
Avg Return
+41.75%
Last Filing
2026-03-31

Suido Kiko Kaisha, Ltd. (6403) has 2 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥9M ($59K) in reported transaction value. The earliest filing StockDrifts holds for Suido Kiko Kaisha, Ltd. is dated 2021-06-22; the most recent is 2026-03-31. All of it is parsed from EDINET large-shareholding (5%+) reports, the official disclosure system operated by the Financial Services Agency (Japan). Across these filings the average return since disclosure is +41.75%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2026-03-31SELLunknown
光通信株式会社
Hikari Tsushin K.K.
unknown0¥4,015-0.1%¥880M ($5.7M)
2026-03-30BUYunknown
メタウォーター株式会社
activist1.5M¥4,015+0.1%¥6.0B ($38.7M)
2026-03-30BUYunknown
東レ株式会社
activist2.2M¥4,015+0.1%¥8.8B ($56.8M)
2026-02-12BUYunknown
東レ株式会社
Toray Industries, Inc.
strategic3.3M¥4,045-0.7%¥1.2B ($7.8M)
2026-02-12BUYunknown
東レ株式会社
Toray Industries, Inc.
strategic4.3M¥4,045-0.7%¥4.3B ($27.9M)
2026-02-12BUYunknown
東レ株式会社
Toray Industries, Inc.
strategic11.0M¥4,045-0.7%¥18.9B ($122.0M)
2026-02-12BUYunknown
東レ株式会社
Toray Industries, Inc.
activist2.2M¥4,045-0.7%¥8.9B ($57.2M)
2025-09-29BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive219.1K¥3,050+31.6%¥9M ($59K)
2025-09-02BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive215.9K¥2,644+51.9%¥571M ($3.7M)
2024-06-07SELLMarket Buy
シンプレクス・アセット・マネジメント株式会社
Simplex Asset Management Co., Ltd.
passive176.3K¥1,838-118.4%¥90M ($581K)
2021-06-22SELLMarket Buy
シンプレクス・アセット・マネジメント株式会社
Simplex Asset Management Co., Ltd.
passive225.2K¥1,974-103.4%¥87M ($564K)

Frequently asked questions

Who has been buying Suido Kiko Kaisha, Ltd. stock?
4 distinct investors have filed 2 disclosed large-shareholding filings in Suido Kiko Kaisha, Ltd. (6403), most recently on 2026-03-31. Each filer, their role, the number of shares and the price at filing are listed in the table on this page.
How many insider filings does Suido Kiko Kaisha, Ltd. have?
Suido Kiko Kaisha, Ltd. has 2 buy-side and 3 sell-side disclosures on record, covering ¥9M ($59K) in total reported value, spanning 2021-06-22 to 2026-03-31.
Where does StockDrifts get Suido Kiko Kaisha, Ltd. insider data?
From EDINET large-shareholding (5%+) reports — the official filing system run by the Financial Services Agency (Japan). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from EDINET.
Do insider buys in Japanese stocks predict returns?
Not uniformly. StockDrifts scored 101,000+ Japanese large-shareholding filings on fixed 12-month forward returns and found the predictive power concentrated in specific filer types and filing patterns rather than spread evenly across all disclosures.

Source filings

Every trade listed above is disclosed in EDINET large-shareholding (5%+) reports, filed with the Financial Services Agency (Japan). View the original EDINET filings for Suido Kiko Kaisha, Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.