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Sumitomo Pharma Co., Ltd. 4506

Company
大日本住友製薬株式会社Sumitomo Pharma Co., Ltd.
Investors
5
Buys
3
Total Value
¥882M ($5.7M)
Avg Return
+3.88%
Last Filing
2026-05-12

Sumitomo Pharma Co., Ltd. (4506) has 3 disclosed large-shareholding filings and 1 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥882M ($5.7M) in reported transaction value. The earliest filing StockDrifts holds for Sumitomo Pharma Co., Ltd. is dated 2021-06-24; the most recent is 2026-05-12. 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 +3.88%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2026-06-05BUYMarket Buy
三井住友DSアセットマネジメント株式会社
passive545.3K¥1,437+8.3%¥784M ($5.1M)
2026-06-05BUYunknown
株式会社 三井住友銀行
other7.0M¥1,437+8.3%¥10.1B ($64.9M)
2026-06-05SELLunknown
SMBC日興証券株式会社
other6.9M¥1,437-8.3%¥18.3B ($117.9M)
2026-05-12BUYMarket Buy
三井住友DSアセットマネジメント株式会社
passive548.2K¥1,609.5-10.7%¥882M ($5.7M)
2026-05-12BUYunknown
株式会社 三井住友銀行
other7.0M¥1,609.5-10.7%¥11.3B ($72.7M)
2026-05-12BUYunknown
SMBC日興証券株式会社
other19.7M¥1,609.5-10.7%¥31.7B ($204.3M)
2026-04-23BUYunknown
住友化学株式会社
SUMITOMO CHEMICAL COMPANY, LIMITED
strategic205.6M¥2,004.5-24.2%¥412.2B ($2.7B)
2023-06-05BUYunknown
住友化学株式会社
SUMITOMO CHEMICAL COMPANY, LIMITED
strategic205.6M¥648+219.9%¥133.3B ($859.7M)
2021-06-24SELLunknown
稲畑産業株式会社
Inabata & Co.,Ltd.
other16.7M¥2,304+10.0%¥9.3B ($59.7M)
2021-06-24BUYunknown
稲畑産業株式会社
Inabata & Co.,Ltd.
other16.7M¥2,304-10.0%¥9.3B ($59.7M)

Frequently asked questions

Who has been buying Sumitomo Pharma Co., Ltd. stock?
5 distinct investors have filed 3 disclosed large-shareholding filings in Sumitomo Pharma Co., Ltd. (4506), most recently on 2026-05-12. 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 Pharma Co., Ltd. have?
Sumitomo Pharma Co., Ltd. has 3 buy-side and 1 sell-side disclosures on record, covering ¥882M ($5.7M) in total reported value, spanning 2021-06-24 to 2026-05-12.
Where does StockDrifts get Sumitomo Pharma 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 Sumitomo Pharma Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.