Who has been buying Daido Steel Co., Ltd. stock?

13 distinct investors have filed 9 disclosed large-shareholding filings in Daido Steel Co., Ltd. (5471), most recently on 2026-02-06. 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 Daido Steel Co., Ltd. have?

Daido Steel Co., Ltd. has 9 buy-side and 15 sell-side disclosures on record, covering ¥11.3B ($72.6M) in total reported value, spanning 2021-07-20 to 2026-02-06.

Where does StockDrifts get Daido 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.

Daido Steel Co., Ltd. 5471

Company

大同特殊鋼株式会社Daido Steel Co., Ltd.

Investors

Buys

Total Value

¥11.3B ($72.6M)

Avg Return

+43.32%

Last Filing

2026-02-06

Daido Steel Co., Ltd. (5471) has 9 disclosed large-shareholding filings and 15 disclosed disposals on record, filed by 13 distinct investors. Together those filings cover ¥11.3B ($72.6M) in reported transaction value. The earliest filing StockDrifts holds for Daido Steel Co., Ltd. is dated 2021-07-20; the most recent is 2026-02-06. 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 +43.32%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

Date	Type	Source	Insider	Purpose	Shares	Price at filing	Return	Value
2026-02-06	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	13.9M	¥2,043.5	-7.4%	¥3.5B ($22.6M)
2025-06-19	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.9M	¥999.3	-89.3%	¥1.8B ($11.3M)
2025-06-19	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	3.8M	¥999.3	-89.3%	¥782M ($5.0M)
2025-06-19	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	2.2M	¥999.3	+89.3%	¥2.2B ($14.4M)
2025-05-22	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	unknown	0	¥951.1	-98.9%	¥248M ($1.6M)
2025-05-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.8M	¥951.1	-98.9%	¥1.6B ($10.5M)
2025-05-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	203.5K	¥951.1	-98.9%	¥62M ($400K)
2025-05-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	9.4M	¥951.1	+98.9%	¥8.9B ($57.4M)
2024-12-05	SELL	negotiated	日本製鉄株式会社 NIPPON STEEL CORPORATION	strategic	10.9M	¥1,163	-62.7%	¥5.4B ($34.9M)
2024-12-05	BUY	negotiated	日本製鉄株式会社 NIPPON STEEL CORPORATION	strategic	10.9M	¥1,163	+62.7%	¥5.4B ($34.9M)
2024-07-29	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	999.7K	¥1,408	+34.4%	¥1.4B ($9.1M)
2024-07-29	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	6.2M	¥1,408	+34.4%	¥612M ($3.9M)
2024-07-29	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	6.1M	¥1,408	+34.4%	¥8.5B ($55.1M)
2024-07-22	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	266.5K	¥1,431	-32.2%	¥653M ($4.2M)
2024-07-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	4.6M	¥1,431	-32.2%	¥3.6B ($23.5M)
2024-07-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	263.2K	¥1,431	+32.2%	¥62M ($401K)
2024-07-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	9.4M	¥1,431	+32.2%	¥13.4B ($86.4M)
2024-04-04	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	2.2M	¥1,693	+11.8%	¥3.8B ($24.4M)
2024-04-04	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	4.7M	¥1,693	+11.8%	¥3.8B ($24.4M)
2024-04-04	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	4.6M	¥1,693	-11.8%	¥2.8B ($17.8M)
2024-02-22	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	722.3K	¥1,845	+2.5%	¥842M ($5.4M)
2024-02-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	7.1M	¥1,845	+2.5%	¥2.8B ($18.1M)
2024-02-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	222.0K	¥1,845	+2.5%	¥410M ($2.6M)
2024-02-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	9.4M	¥1,845	+2.5%	¥17.3B ($111.4M)
2023-08-07	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	50.8K	¥1,192	+58.7%	¥61M ($391K)
2023-08-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.1M	¥1,192	+58.7%	¥533M ($3.4M)
2023-08-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	1.9M	¥1,192	+58.7%	¥2.2B ($14.4M)
2023-02-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	667.9K	¥974	-94.3%	¥423M ($2.7M)
2023-02-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	1.9M	¥974	+94.3%	¥1.8B ($11.8M)
2023-01-06	SELL	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	201.7K	¥840	-125.2%	¥29M ($188K)
2023-01-06	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.1M	¥840	-125.2%	¥182M ($1.2M)
2023-01-06	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.2M	¥840	-125.2%	¥164M ($1.1M)
2022-05-16	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	234.6K	¥698	+171.1%	¥85M ($548K)
2022-05-16	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.4M	¥698	-171.1%	¥191M ($1.2M)
2022-05-16	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.4M	¥698	+171.1%	¥981M ($6.3M)
2021-07-20	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.8M	¥1,028	+84.0%	¥1.8B ($11.8M)
2021-07-20	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	29.3K	¥1,028	-84.0%	¥49M ($317K)

Frequently asked questions

Who has been buying Daido Steel Co., Ltd. stock?: 13 distinct investors have filed 9 disclosed large-shareholding filings in Daido Steel Co., Ltd. (5471), most recently on 2026-02-06. 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 Daido Steel Co., Ltd. have?: Daido Steel Co., Ltd. has 9 buy-side and 15 sell-side disclosures on record, covering ¥11.3B ($72.6M) in total reported value, spanning 2021-07-20 to 2026-02-06.
Where does StockDrifts get Daido 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 Daido Steel Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.