Who has been buying Sumitomo Seika Chemicals Company, Limited. stock?

8 distinct investors have filed 3 disclosed large-shareholding filings in Sumitomo Seika Chemicals Company, Limited. (4008), most recently on 2025-11-07. 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 Sumitomo Seika Chemicals Company, Limited. have?

Sumitomo Seika Chemicals Company, Limited. has 3 buy-side and 10 sell-side disclosures on record, covering ¥185M ($1.2M) in total reported value, spanning 2021-12-07 to 2025-11-07.

Where does StockDrifts get Sumitomo Seika Chemicals Company, Limited. 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.

Sumitomo Seika Chemicals Company, Limited. 4008

Company

住友精化株式会社Sumitomo Seika Chemicals Company, Limited.

Investors

Buys

Total Value

¥185M ($1.2M)

Avg Return

+63.15%

Last Filing

2025-11-07

Sumitomo Seika Chemicals Company, Limited. (4008) has 3 disclosed large-shareholding filings and 10 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥185M ($1.2M) in reported transaction value. The earliest filing StockDrifts holds for Sumitomo Seika Chemicals Company, Limited. is dated 2021-12-07; the most recent is 2025-11-07. 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 +63.15%, 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
2025-11-07	BUY	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	122.3K	¥956	+32.5%	¥4M ($26K)
2025-11-07	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	207.5K	¥956	-32.5%	¥126M ($811K)
2025-11-07	SELL	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	181.6K	¥956	-32.5%	¥60M ($388K)
2024-04-05	SELL	Market Buy	ティー・ロウ・プライス・ジャパン株式会社 T. Rowe Price Japan, Inc.	passive	618.3K	¥1,012	-25.2%	¥156M ($1.0M)
2023-07-06	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	117.1K	¥895	-41.6%	¥25M ($161K)
2023-07-06	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	338.7K	¥895	-41.6%	¥53M ($339K)
2023-07-06	SELL	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	243.9K	¥895	-41.6%	¥70M ($452K)
2023-05-30	BUY	unknown	広栄化学株式会社 Koei Chemical Company, Limited	strategic	24.0K	¥834	+51.9%	¥20M ($129K)
2023-05-30	BUY	unknown	住友化学株式会社 SUMITOMO CHEMICAL COMPANY, LIMITED	strategic	4.2M	¥834	+51.9%	¥3.5B ($22.6M)
2022-11-22	SELL	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	313.6K	¥820	-54.5%	¥203M ($1.3M)
2022-11-22	BUY	unknown	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	290.4K	¥820	+54.5%	¥84M ($540K)
2022-11-15	SELL	Market Buy	ティー・ロウ・プライス・ジャパン株式会社 T. Rowe Price Japan, Inc.	passive	771.2K	¥746	-69.8%	¥561M ($3.6M)
2022-10-25	SELL	Market Buy	ティー・ロウ・プライス・ジャパン株式会社 T. Rowe Price Japan, Inc.	passive	1.5M	¥599.8	-111.2%	¥92M ($595K)
2022-07-04	SELL	Market Buy	ティー・ロウ・プライス・ジャパン株式会社 T. Rowe Price Japan, Inc.	passive	1.7M	¥582.6	-117.5%	¥81M ($525K)
2021-12-07	BUY	Market Buy	ティー・ロウ・プライス・ジャパン株式会社 T. Rowe Price Japan, Inc.	passive	1.8M	¥626	+102.4%	¥97M ($626K)

Frequently asked questions

Who has been buying Sumitomo Seika Chemicals Company, Limited. stock?: 8 distinct investors have filed 3 disclosed large-shareholding filings in Sumitomo Seika Chemicals Company, Limited. (4008), most recently on 2025-11-07. 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 Sumitomo Seika Chemicals Company, Limited. have?: Sumitomo Seika Chemicals Company, Limited. has 3 buy-side and 10 sell-side disclosures on record, covering ¥185M ($1.2M) in total reported value, spanning 2021-12-07 to 2025-11-07.
Where does StockDrifts get Sumitomo Seika Chemicals Company, Limited. 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 Sumitomo Seika Chemicals Company, Limited.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.