Who has been buying Sankyo Tateyama, Inc. stock?

4 distinct investors have filed 3 disclosed large-shareholding filings in Sankyo Tateyama, Inc. (5932), most recently on 2025-09-19. 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 Sankyo Tateyama, Inc. have?

Sankyo Tateyama, Inc. has 3 buy-side and 9 sell-side disclosures on record, covering ¥319M ($2.1M) in total reported value, spanning 2021-07-06 to 2025-09-19.

Where does StockDrifts get Sankyo Tateyama, Inc. 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.

Sankyo Tateyama, Inc. 5932

Company

三協立山株式会社Sankyo Tateyama, Inc.

Investors

Buys

Total Value

¥319M ($2.1M)

Avg Return

-16.86%

Last Filing

2025-09-19

Sankyo Tateyama, Inc. (5932) has 3 disclosed large-shareholding filings and 9 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥319M ($2.1M) in reported transaction value. The earliest filing StockDrifts holds for Sankyo Tateyama, Inc. is dated 2021-07-06; the most recent is 2025-09-19. 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 -16.86%, 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
2025-09-19	SELL	negotiated	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	425.5K	¥658	-7.5%	¥8M ($54K)
2025-09-19	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	556.3K	¥658	-7.5%	¥25M ($161K)
2025-09-19	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	971.7K	¥658	+7.5%	¥639M ($4.1M)
2025-03-03	SELL	unknown	住友化学株式会社 SUMITOMO CHEMICAL COMPANY, LIMITED	strategic	1.6M	¥599	-18.0%	¥212M ($1.4M)
2025-02-20	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	439.3K	¥597	-18.4%	¥100M ($644K)
2025-02-20	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	592.3K	¥597	-18.4%	¥92M ($596K)
2025-02-20	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	971.7K	¥597	+18.4%	¥580M ($3.7M)
2025-02-18	SELL	unknown	住友化学株式会社 SUMITOMO CHEMICAL COMPANY, LIMITED	strategic	1.9M	¥603	-17.3%	¥190M ($1.2M)
2023-08-21	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	606.7K	¥851	-16.9%	¥207M ($1.3M)
2023-08-21	BUY	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	749.1K	¥851	-16.9%	¥132M ($849K)
2023-08-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	971.7K	¥851	-16.9%	¥827M ($5.3M)
2023-07-21	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	362.0K	¥928	+23.8%	¥73M ($472K)
2023-07-21	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	592.0K	¥928	+23.8%	¥217M ($1.4M)
2023-07-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	971.7K	¥928	-23.8%	¥902M ($5.8M)
2023-05-24	BUY	unknown	住友化学株式会社 SUMITOMO CHEMICAL COMPANY, LIMITED	strategic	2.2M	¥678	+4.3%	¥1.5B ($9.8M)
2021-07-06	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	442.9K	¥849	-16.7%	¥113M ($726K)
2021-07-06	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	828.1K	¥849	+16.7%	¥62M ($398K)
2021-07-06	BUY	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	971.7K	¥849	-16.7%	¥825M ($5.3M)

Frequently asked questions

Who has been buying Sankyo Tateyama, Inc. stock?: 4 distinct investors have filed 3 disclosed large-shareholding filings in Sankyo Tateyama, Inc. (5932), most recently on 2025-09-19. 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 Sankyo Tateyama, Inc. have?: Sankyo Tateyama, Inc. has 3 buy-side and 9 sell-side disclosures on record, covering ¥319M ($2.1M) in total reported value, spanning 2021-07-06 to 2025-09-19.
Where does StockDrifts get Sankyo Tateyama, Inc. 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 Sankyo Tateyama, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.