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Tohoku Steel Co., Ltd. 5484

Company
東北特殊鋼株式会社Tohoku Steel Co., Ltd.
Investors
8
Buys
9
Total Value
¥3.9B ($25.3M)
Avg Return
+27.85%
Last Filing
2025-09-29

Tohoku Steel Co., Ltd. (5484) has 9 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥3.9B ($25.3M) in reported transaction value. The earliest filing StockDrifts holds for Tohoku Steel Co., Ltd. is dated 2021-03-31; the most recent is 2025-09-29. 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 +27.85%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2026-07-06BUYMarket Buy
株式会社UH Partners 2
passive474.4K¥4,450+0.0%¥2.1B ($13.6M)
2026-07-06SELLacquisition
光通信株式会社
passive488.1K¥4,450+0.0%¥336M ($2.2M)
2026-07-06BUYMarket Buy
株式会社エスアイエル
passive120.2K¥4,450+0.0%¥535M ($3.5M)
2026-07-06BUYMarket Buy
株式会社UH Partners 3
passive476.5K¥4,450+0.0%¥2.1B ($13.7M)
2026-07-03BUYunknown
株式会社UH Partners 2
unknown474.4K¥4,450+0.0%¥2.1B ($13.6M)
2026-07-03BUYunknown
株式会社エスアイエル
unknown120.2K¥4,450+0.0%¥535M ($3.5M)
2026-07-03BUYunknown
株式会社UH Partners 3
unknown476.5K¥4,450+0.0%¥2.1B ($13.7M)
2026-07-03BUYunknown
株式会社UH Partners 3
unknown476.5K¥4,450+0.0%¥2.1B ($13.7M)
2026-07-03BUYunknown
株式会社UH Partners 2
unknown474.4K¥4,450+0.0%¥2.1B ($13.6M)
2026-07-03SELLunknown
光通信株式会社
unknown488.1K¥4,450+0.0%¥336M ($2.2M)
2026-07-03BUYunknown
株式会社エスアイエル
unknown120.2K¥4,450+0.0%¥535M ($3.5M)
2026-07-03SELLunknown
光通信株式会社
unknown488.1K¥4,450+0.0%¥336M ($2.2M)
2026-07-03BUYunknown
東京窯業株式会社
unknown631.0K¥4,450+0.0%¥2.8B ($18.1M)
2026-07-03BUYMarket Buy
大同特殊鋼株式会社
strategic4.3M¥4,450+0.0%¥7.8B ($50.3M)
2026-07-03BUYunknown
株式会社エスアイエル
unknown120.2K¥4,450+0.0%¥535M ($3.5M)
2026-07-03BUYunknown
岡谷鋼機株式会社
unknown752.0K¥4,450+0.0%¥3.3B ($21.6M)
2026-07-03BUYunknown
東京窯業株式会社
strategic631.0K¥4,450+0.0%¥2.8B ($18.1M)
2026-07-03BUYunknown
株式会社UH Partners 3
unknown476.5K¥4,450+0.0%¥2.1B ($13.7M)
2026-07-03BUYunknown
株式会社UH Partners 2
unknown474.4K¥4,450+0.0%¥2.1B ($13.6M)
2026-07-03SELLunknown
光通信株式会社
unknown488.1K¥4,450+0.0%¥336M ($2.2M)
2026-07-03BUYunknown
東京窯業株式会社
unknown631.0K¥4,450+0.0%¥2.8B ($18.1M)
2026-07-03BUYunknown
岡谷鋼機株式会社
strategic752.0K¥4,450+0.0%¥3.3B ($21.6M)
2026-05-22BUYunknown
株式会社UH Partners 3
unknown476.5K¥4,480+0.0%¥2.1B ($13.8M)
2026-05-22BUYunknown
光通信株式会社
unknown563.6K¥4,480+0.0%¥2.5B ($16.3M)
2026-05-22BUYunknown
株式会社エスアイエル
unknown120.2K¥4,480+0.0%¥538M ($3.5M)
2026-05-22BUYunknown
株式会社UH Partners 3
unknown476.5K¥4,480+0.0%¥2.1B ($13.8M)
2026-05-22BUYunknown
株式会社UH Partners 2
unknown474.4K¥4,480+0.0%¥2.1B ($13.7M)
2026-05-22BUYMarket Buy
東京窯業株式会社
unknown631.0K¥4,480+0.0%¥166M ($1.1M)
2026-05-22BUYnegotiated
大同特殊鋼株式会社
strategic2.5M¥4,480+0.0%¥11.4B ($73.7M)
2026-05-22BUYunknown
株式会社エスアイエル
unknown120.2K¥4,480+0.0%¥538M ($3.5M)
2026-05-22BUYunknown
株式会社UH Partners 2
unknown474.4K¥4,480+0.0%¥2.1B ($13.7M)
2026-05-22BUYunknown
光通信株式会社
unknown563.6K¥4,480+0.0%¥2.5B ($16.3M)
2026-05-22BUYunknown
岡谷鋼機株式会社
unknown752.0K¥4,480+0.0%¥3.4B ($21.7M)
2026-05-22BUYMarket Buy
東京窯業株式会社
strategic631.0K¥4,480+0.0%¥166M ($1.1M)
2026-05-22BUYMarket Buy
株式会社エスアイエル
passive120.2K¥4,480+0.0%¥538M ($3.5M)
2026-05-22BUYMarket Buy
株式会社UH Partners 3
passive476.5K¥4,480+0.0%¥2.1B ($13.8M)
2026-05-22BUYMarket Buy
株式会社UH Partners 2
passive474.4K¥4,480+0.0%¥2.1B ($13.7M)
2026-05-22BUYacquisition
光通信株式会社
passive563.6K¥4,480+0.0%¥2.5B ($16.3M)
2026-05-22BUYunknown
株式会社UH Partners 2
unknown474.4K¥4,480+0.0%¥2.1B ($13.7M)
2026-05-22BUYunknown
光通信株式会社
unknown563.6K¥4,480+0.0%¥2.5B ($16.3M)
2026-05-22BUYunknown
東京窯業株式会社
unknown631.0K¥4,480+0.0%¥166M ($1.1M)
2026-05-22BUYunknown
岡谷鋼機株式会社
strategic752.0K¥4,480+0.0%¥3.4B ($21.7M)
2026-05-22BUYunknown
株式会社エスアイエル
unknown120.2K¥4,480+0.0%¥538M ($3.5M)
2026-05-22BUYunknown
株式会社UH Partners 3
unknown476.5K¥4,480+0.0%¥2.1B ($13.8M)
2026-05-22BUYunknown
株式会社UH Partners 2
unknown474.4K¥4,480+0.0%¥2.1B ($13.7M)
2026-05-22BUYunknown
光通信株式会社
unknown563.6K¥4,480+0.0%¥2.5B ($16.3M)
2026-05-22BUYunknown
岡谷鋼機株式会社
strategic752.0K¥4,480+0.0%¥3.4B ($21.7M)
2026-05-22BUYunknown
株式会社エスアイエル
unknown120.2K¥4,480+0.0%¥538M ($3.5M)
2026-05-22BUYMarket Buy
東京窯業株式会社
unknown631.0K¥4,480+0.0%¥166M ($1.1M)
2026-05-22BUYunknown
株式会社UH Partners 3
unknown476.5K¥4,480+0.0%¥2.1B ($13.8M)

Showing the 50 most recent of 84 filings.

Frequently asked questions

Who has been buying Tohoku Steel Co., Ltd. stock?
8 distinct investors have filed 9 disclosed large-shareholding filings in Tohoku Steel Co., Ltd. (5484), most recently on 2025-09-29. 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 Tohoku Steel Co., Ltd. have?
Tohoku Steel Co., Ltd. has 9 buy-side and 5 sell-side disclosures on record, covering ¥3.9B ($25.3M) in total reported value, spanning 2021-03-31 to 2025-09-29.
Where does StockDrifts get Tohoku Steel Co., 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 Tohoku Steel Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.