Who has been buying Sintokogio,Ltd. stock?

7 distinct investors have filed 4 disclosed large-shareholding filings in Sintokogio,Ltd. (6339), most recently on 2026-03-30. 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 Sintokogio,Ltd. have?

Sintokogio,Ltd. has 4 buy-side and 9 sell-side disclosures on record, covering ¥1.2B ($7.6M) in total reported value, spanning 2021-05-21 to 2026-03-30.

Where does StockDrifts get Sintokogio,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.

Sintokogio,Ltd. 6339

Company

新東工業株式会社Sintokogio,Ltd.

Investors

Buys

Total Value

¥1.2B ($7.6M)

Avg Return

+12.13%

Last Filing

2026-03-30

Sintokogio,Ltd. (6339) has 4 disclosed large-shareholding filings and 9 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥1.2B ($7.6M) in reported transaction value. The earliest filing StockDrifts holds for Sintokogio,Ltd. is dated 2021-05-21; the most recent is 2026-03-30. 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 +12.13%, 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
2026-03-30	SELL	negotiated	三菱UFJ信託銀行株式会社	passive	1.4M	¥918	-7.7%	¥50M ($323K)
2026-03-30	SELL	negotiated	株式会社三菱UFJ銀行	strategic	2.0M	¥918	-7.7%	¥271M ($1.7M)
2026-03-30	SELL	negotiated	三菱UFJアセットマネジメント株式会社	passive	273.0K	¥918	-7.7%	¥256M ($1.6M)
2024-07-29	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	2.3M	¥1,110	-13.1%	¥2.5B ($16.4M)
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	549.8K	¥1,110	-13.1%	¥333M ($2.1M)
2024-07-29	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.5M	¥1,110	-13.1%	¥1.6B ($10.5M)
2023-01-10	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	578.6K	¥662	-45.8%	¥275M ($1.8M)
2023-01-10	SELL	unknown	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	1.8M	¥662	-45.8%	¥105M ($676K)
2022-06-20	SELL	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	248.5K	¥662	-45.8%	¥18M ($117K)
2022-06-20	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.5M	¥662	-45.8%	¥340M ($2.2M)
2022-06-20	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	2.3M	¥662	+45.8%	¥1.5B ($9.8M)
2021-07-19	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	280.4K	¥794	+21.5%	¥52M ($336K)
2021-07-19	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	2.0M	¥794	-21.5%	¥442M ($2.9M)
2021-07-19	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	2.3M	¥794	+21.5%	¥1.8B ($11.7M)
2021-06-04	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	991.3K	¥804	+20.0%	¥797M ($5.1M)
2021-06-04	BUY	unknown	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	2.0M	¥804	+20.0%	¥1.6B ($10.2M)
2021-05-21	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.2M	¥742	-30.1%	¥405M ($2.6M)
2021-05-21	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	1.0M	¥742	+30.1%	¥743M ($4.8M)

Frequently asked questions

Who has been buying Sintokogio,Ltd. stock?: 7 distinct investors have filed 4 disclosed large-shareholding filings in Sintokogio,Ltd. (6339), most recently on 2026-03-30. 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 Sintokogio,Ltd. have?: Sintokogio,Ltd. has 4 buy-side and 9 sell-side disclosures on record, covering ¥1.2B ($7.6M) in total reported value, spanning 2021-05-21 to 2026-03-30.
Where does StockDrifts get Sintokogio,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 Sintokogio,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.