Who has been buying Sinko Industries Ltd. stock?

10 distinct investors have filed 21 disclosed large-shareholding filings in Sinko Industries Ltd. (6458), most recently on 2026-05-14. 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 Sinko Industries Ltd. have?

Sinko Industries Ltd. has 21 buy-side and 17 sell-side disclosures on record, covering ¥7.3B ($46.8M) in total reported value, spanning 2021-08-13 to 2026-05-14.

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.

Sinko Industries Ltd. 6458

Company

新晃工業株式会社Sinko Industries Ltd.

Investors

Buys

Total Value

¥7.3B ($46.8M)

Avg Return

+34.48%

Last Filing

2026-05-14

Sinko Industries Ltd. (6458) has 21 disclosed large-shareholding filings and 17 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥7.3B ($46.8M) in reported transaction value. The earliest filing StockDrifts holds for Sinko Industries Ltd. is dated 2021-08-13; the most recent is 2026-05-14. Across these filings the average return since disclosure is +34.48%, 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
2026-05-21	SELL	unknown	野村アセットマネジメント株式会社	other	1.6M	¥1,243	+0.2%	¥18M ($116K)
2026-05-21	SELL	unknown	野村證券株式会社	other	3.5M	¥1,243	+0.2%	¥54M ($349K)
2026-05-21	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.4M	¥1,243	+0.2%	¥63M ($407K)
2026-05-14	BUY	unknown	藤井智明	unknown	98.8K	¥1,302	-	¥129M ($830K)
2026-05-14	BUY	Market Buy	株式会社明晃	activist	13.5M	¥1,302	-4.7%	¥1.1B ($7.1M)
2026-04-20	BUY	Market Buy	野村證券株式会社	other	3.5M	¥1,220	+1.7%	¥1.0B ($6.7M)
2026-04-20	SELL	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.5M	¥1,220	-1.7%	¥770M ($5.0M)
2026-04-20	BUY	Market Buy	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	unknown	0	¥1,220	-	-
2026-04-20	SELL	Market Buy	野村アセットマネジメント株式会社	other	1.6M	¥1,220	-1.7%	¥27M ($171K)
2026-03-30	BUY	Market Buy	株式会社三菱UFJ銀行	strategic	2.2M	¥1,200	+3.4%	¥174M ($1.1M)
2026-03-30	BUY	Market Buy	三菱UFJ信託銀行株式会社	passive	844.1K	¥1,200	+3.4%	¥87M ($562K)
2026-03-30	BUY	Market Buy	三菱UFJアセットマネジメント株式会社	passive	1.4M	¥1,200	+3.4%	¥627M ($4.0M)
2026-03-16	SELL	unknown	グッドハートパートナーズエルエルピー(Goodhart Partners LLP) Goodhart Partners LLP	other	3.4M	¥1,257	+1.3%	¥930M ($6.0M)
2026-02-19	SELL	unknown	グッドハートパートナーズエルエルピー(Goodhart Partners LLP) Goodhart Partners LLP	other	4.2M	¥1,458	+14.9%	¥1.2B ($7.9M)
2025-10-28	SELL	unknown	グッドハートパートナーズエルエルピー(Goodhart Partners LLP) Goodhart Partners LLP	other	5.4M	¥1,297	+4.3%	¥1.0B ($6.5M)
2025-09-05	SELL	unknown	グッドハートパートナーズエルエルピー(Goodhart Partners LLP) Goodhart Partners LLP	other	6.1M	¥1,340	+7.4%	¥1.0B ($6.8M)
2025-05-22	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	2.3M	¥1,188	-4.5%	¥469M ($3.0M)
2025-05-22	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.7M	¥1,188	-4.5%	¥101M ($652K)
2025-05-22	BUY	unknown	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥1,188	-	-
2025-05-22	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	2.7M	¥1,188	-4.5%	¥92M ($593K)
2025-04-24	SELL	unknown	グッドハートパートナーズエルエルピー(Goodhart Partners LLP) Goodhart Partners LLP	other	6.9M	¥1,170	-6.1%	¥1.0B ($6.5M)
2025-04-22	BUY	unknown	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥1,173	+5.8%	-
2025-04-22	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	2.8M	¥1,173	+5.8%	¥3.3B ($21.0M)
2025-04-22	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	2.7M	¥1,173	+5.8%	¥3.1B ($20.3M)
2025-04-22	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	¥1,173	+5.8%	¥2.1B ($13.4M)
2025-03-31	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	2.2M	¥1,204	+3.1%	¥2.7B ($17.3M)
2025-03-31	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	822.6K	¥1,204	+3.1%	¥990M ($6.4M)
2025-03-31	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	899.1K	¥1,204	+3.1%	¥1.1B ($7.0M)
2025-03-21	BUY	Market Buy	株式会社明晃 KK MEIKO	activist	13.5M	¥1,270	-2.3%	¥1.0B ($6.5M)
2024-07-02	BUY	Market Buy	グッドハートパートナーズエルエルピー(Goodhart Partners LLP) Goodhart Partners LLP	other	2.7M	¥1,366.67	-9.2%	¥376M ($2.4M)
2023-06-05	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	743.8K	¥668.33	-85.7%	¥115M ($739K)
2023-06-05	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	273.5K	¥668.33	-85.7%	¥36M ($235K)
2023-06-05	SELL	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	121.4K	¥668.33	-85.7%	¥2M ($12K)
2023-05-19	BUY	Market Buy	グッドハートパートナーズエルエルピー(Goodhart Partners LLP) Goodhart Partners LLP	other	2.5M	¥653.67	+89.8%	¥178M ($1.1M)
2023-01-24	BUY	Market Buy	グッドハートパートナーズエルエルピー(Goodhart Partners LLP) Goodhart Partners LLP	other	2.2M	¥514	+141.4%	¥140M ($902K)
2022-06-06	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	913.0K	¥552	-124.8%	¥69M ($446K)
2022-06-06	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	328.9K	¥552	-124.8%	¥98M ($630K)
2022-06-06	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	125.2K	¥552	+124.8%	¥2M ($10K)
2022-03-25	BUY	Market Buy	グッドハートパートナーズエルエルピー(Goodhart Partners LLP) Goodhart Partners LLP	other	1.9M	¥583.67	+112.6%	¥164M ($1.1M)
2022-01-18	BUY	Market Buy	グッドハートパートナーズエルエルピー(Goodhart Partners LLP) Goodhart Partners LLP	other	1.6M	¥627.67	+97.7%	¥171M ($1.1M)
2021-12-06	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.0M	¥634.67	-95.5%	¥159M ($1.0M)
2021-12-06	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	506.8K	¥634.67	-95.5%	¥109M ($702K)
2021-12-06	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	121.5K	¥634.67	+95.5%	¥17M ($111K)
2021-08-13	BUY	unknown	グッドハートパートナーズエルエルピー(Goodhart Partners LLP) Goodhart Partners LLP	other	1.4M	¥733.33	+69.2%	¥1.0B ($6.5M)

Frequently asked questions

Who has been buying Sinko Industries Ltd. stock?: 10 distinct investors have filed 21 disclosed large-shareholding filings in Sinko Industries Ltd. (6458), most recently on 2026-05-14. 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 Sinko Industries Ltd. have?: Sinko Industries Ltd. has 21 buy-side and 17 sell-side disclosures on record, covering ¥7.3B ($46.8M) in total reported value, spanning 2021-08-13 to 2026-05-14.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.