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

9 distinct investors have filed 26 disclosed large-shareholding filings in Osaka Steel Co., Ltd. (5449), most recently on 2026-02-26. 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 Osaka Steel Co., Ltd. have?

Osaka Steel Co., Ltd. has 26 buy-side and 8 sell-side disclosures on record, covering ¥8.2B ($53.0M) in total reported value, spanning 2021-03-30 to 2026-02-26.

Where does StockDrifts get Osaka 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.

Osaka Steel Co., Ltd. 5449

Company

大阪製鐵株式会社Osaka Steel Co., Ltd.

Investors

Buys

Total Value

¥8.2B ($53.0M)

Avg Return

+50.36%

Last Filing

2026-02-26

Osaka Steel Co., Ltd. (5449) has 26 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥8.2B ($53.0M) in reported transaction value. The earliest filing StockDrifts holds for Osaka Steel Co., Ltd. is dated 2021-03-30; the most recent is 2026-02-26. 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 +50.36%, 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
2026-02-26	SELL	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.6M	¥2,578	+5.8%	¥218M ($1.4M)
2026-02-06	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	5.2M	¥2,895	-16.1%	¥98M ($632K)
2025-07-09	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	5.2M	¥2,941	-17.4%	¥15.3B ($98.6M)
2025-07-09	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	5.2M	¥2,941	-17.4%	¥15.3B ($98.6M)
2025-05-09	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	5.2M	¥2,414	+0.6%	¥704M ($4.5M)
2025-05-09	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	5.2M	¥2,414	+0.6%	¥12.5B ($80.9M)
2025-04-16	BUY	negotiated	日鉄テックスエンジ株式会社 Nippon Steel Tex Engine Co., Ltd.	strategic	48.2K	¥2,498	-2.8%	¥120M ($777K)
2025-04-16	BUY	negotiated	日鉄物流株式会社 Nippon Steel Logistics Co., Ltd.	strategic	54.3K	¥2,498	-2.8%	¥136M ($875K)
2025-04-16	SELL	negotiated	日本製鉄株式会社 NIPPON STEEL CORPORATION	strategic	16.6M	¥2,498	+2.8%	¥22.5B ($145.1M)
2025-03-24	BUY	negotiated	日鉄テックスエンジ株式会社 Nippon Steel Tex Engine Co., Ltd.	strategic	48.2K	¥2,975	-18.4%	¥143M ($925K)
2025-03-24	BUY	negotiated	日鉄物流株式会社 Nippon Steel Logistics Co., Ltd.	strategic	54.3K	¥2,975	-18.4%	¥162M ($1.0M)
2025-03-24	BUY	negotiated	日本製鉄株式会社 NIPPON STEEL CORPORATION	strategic	25.6M	¥2,975	-18.4%	¥76.2B ($491.9M)
2025-03-05	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	4.9M	¥2,899	-16.3%	¥1.2B ($8.0M)
2025-02-10	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	4.5M	¥2,620	-7.3%	¥1.2B ($7.9M)
2024-10-17	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	4.0M	¥3,330	-27.1%	¥1.4B ($9.2M)
2024-08-28	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	3.6M	¥3,065	-20.8%	¥1.4B ($8.8M)
2024-08-06	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	3.1M	¥2,564	-5.3%	¥1.2B ($7.6M)
2024-07-08	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	2.7M	¥2,277	+6.6%	¥173M ($1.1M)
2024-04-11	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	2.6M	¥2,200	+10.4%	¥121M ($780K)
2024-04-08	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	2.5M	¥2,211	+9.8%	¥963M ($6.2M)
2024-01-09	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.7M	¥2,534	-4.2%	¥6.8B ($44.2M)
2023-12-26	BUY	Market Buy	株式会社ストラテジックキャピタル Strategic Capital, Inc.	activist	2.1M	¥2,104	+15.4%	¥4.4B ($28.7M)
2023-11-14	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.7M	¥1,836	+32.2%	¥5.0B ($32.0M)
2023-11-10	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.7M	¥1,869	+29.9%	¥5.0B ($32.6M)
2023-10-03	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.7M	¥1,725	+40.8%	¥4.7B ($30.1M)
2023-08-21	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.7M	¥1,633	+48.7%	¥4.4B ($28.5M)
2023-07-20	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.7M	¥1,422	+70.8%	¥54M ($349K)
2023-07-13	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.7M	¥1,399	+73.5%	¥18M ($114K)
2023-07-12	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.7M	¥1,395	+74.0%	¥454M ($2.9M)
2023-05-02	SELL	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・エルエルシー J.P. Morgan Securities LLC	other	1.4M	¥1,292	-87.9%	¥552M ($3.6M)
2023-05-02	SELL	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	50.5K	¥1,292	-87.9%	¥71M ($458K)
2023-05-02	BUY	Market Buy	JPモルガン証券株式会社 JPMorgan Securities Japan Co., Ltd.	other	505.0K	¥1,292	+87.9%	¥322M ($2.1M)
2023-05-02	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.3M	¥1,292	+87.9%	¥3.0B ($19.4M)
2023-05-01	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.3M	¥1,312	+85.1%	¥3.0B ($19.7M)
2023-04-10	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.3M	¥1,279	+89.8%	¥3.0B ($19.2M)
2023-03-27	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.3M	¥1,242	+95.5%	¥2.9B ($18.6M)
2023-01-30	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.3M	¥1,270	+91.2%	¥3.0B ($19.0M)
2023-01-12	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.3M	¥1,159	+109.5%	¥2.7B ($17.4M)
2023-01-11	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.3M	¥1,142	+112.6%	¥2.7B ($17.1M)
2022-11-02	BUY	unknown	ジェー・ピー・モルガン・セキュリティーズ・エルエルシー J.P. Morgan Securities LLC	other	1.8M	¥1,077	+125.4%	¥1.9B ($12.6M)
2022-11-02	BUY	unknown	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	106.5K	¥1,077	+125.4%	¥115M ($740K)
2022-11-02	BUY	unknown	JPモルガン証券株式会社 JPMorgan Securities Japan Co., Ltd.	other	254.8K	¥1,077	+125.4%	¥274M ($1.8M)
2022-10-26	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.3M	¥1,072	+126.5%	¥2.5B ($16.1M)
2022-10-25	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	2.3M	¥1,049	+131.5%	¥2.4B ($15.7M)
2022-10-05	BUY	unknown	ジェー・ピー・モルガン・セキュリティーズ・エルエルシー J.P. Morgan Securities LLC	other	1.8M	¥1,194	+103.3%	¥2.2B ($13.9M)
2022-10-05	BUY	unknown	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	15.0K	¥1,194	+103.3%	¥2.0B ($12.6M)
2022-10-05	SELL	unknown	JPモルガン証券株式会社 JPMorgan Securities Japan Co., Ltd.	other	257.8K	¥1,194	-103.3%	¥35M ($228K)
2022-09-21	BUY	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・エルエルシー J.P. Morgan Securities LLC	other	1.8M	¥1,176	+106.5%	¥2.1B ($13.7M)
2022-09-21	SELL	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	53.0K	¥1,176	-106.5%	¥388M ($2.5M)
2022-09-21	BUY	Market Buy	JPモルガン証券株式会社 JPMorgan Securities Japan Co., Ltd.	other	288.8K	¥1,176	+106.5%	¥239M ($1.5M)

Showing the 50 most recent of 84 filings.

Frequently asked questions

Who has been buying Osaka Steel Co., Ltd. stock?: 9 distinct investors have filed 26 disclosed large-shareholding filings in Osaka Steel Co., Ltd. (5449), most recently on 2026-02-26. 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 Osaka Steel Co., Ltd. have?: Osaka Steel Co., Ltd. has 26 buy-side and 8 sell-side disclosures on record, covering ¥8.2B ($53.0M) in total reported value, spanning 2021-03-30 to 2026-02-26.
Where does StockDrifts get Osaka 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 Osaka Steel Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.