Who has been buying D. Western Therapeutics Institute, Inc. stock?

7 distinct investors have filed 4 disclosed large-shareholding filings in D. Western Therapeutics Institute, Inc. (4576), most recently on 2026-05-13. 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 D. Western Therapeutics Institute, Inc. have?

D. Western Therapeutics Institute, Inc. has 4 buy-side and 37 sell-side disclosures on record, covering ¥4.2B ($27.4M) in total reported value, spanning 2021-05-14 to 2026-05-13.

Where does StockDrifts get D. Western Therapeutics Institute, 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.

D. Western Therapeutics Institute, Inc. 4576

Company

株式会社デ・ウエスタン・セラピテクス研究所D. Western Therapeutics Institute, Inc.

Investors

Buys

Total Value

¥4.2B ($27.4M)

Avg Return

-27.40%

Last Filing

2026-05-13

D. Western Therapeutics Institute, Inc. (4576) has 4 disclosed large-shareholding filings and 37 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥4.2B ($27.4M) in reported transaction value. The earliest filing StockDrifts holds for D. Western Therapeutics Institute, Inc. is dated 2021-05-14; the most recent is 2026-05-13. 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 -27.40%, 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
2026-05-13	SELL	unknown	日髙有一 HIDAKA YUUICHI	activist	5.1M	¥88	+17.1%	¥104M ($670K)
2026-01-27	SELL	unknown	日髙有一 HIDAKA YUUICHI	activist	5.0M	¥101	+5.9%	¥48M ($307K)
2025-12-04	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	2.5M	¥107	+11.2%	¥60M ($389K)
2025-10-21	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	3.1M	¥107	+11.2%	¥103M ($665K)
2025-10-02	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	4.1M	¥115	+17.4%	¥248M ($1.6M)
2025-09-25	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	6.3M	¥158	+39.9%	¥81M ($525K)
2025-09-11	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	6.9M	¥103	+7.8%	¥45M ($289K)
2025-09-02	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	7.4M	¥116	+18.1%	¥145M ($934K)
2025-09-01	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	8.8M	¥116	+18.1%	¥58M ($371K)
2025-08-22	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	9.4M	¥105	+9.5%	¥76M ($489K)
2025-08-18	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	10.2M	¥117	+18.8%	¥97M ($624K)
2025-08-07	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	11.2M	¥113	-15.9%	¥1.3B ($8.2M)
2025-02-06	SELL	Market Buy	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	1.5M	¥140	+32.1%	¥98M ($632K)
2025-02-05	SELL	Market Buy	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	2.3M	¥119	+20.2%	¥57M ($367K)
2025-01-29	SELL	Market Buy	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	2.8M	¥124	+23.4%	¥103M ($663K)
2025-01-08	SELL	unknown	日髙邦江 Kunie Hidaka	strategic	300.0K	¥169	+43.8%	¥30M ($191K)
2025-01-08	SELL	unknown	日髙邦江 Kunie Hidaka	strategic	300.0K	¥169	+43.8%	¥30M ($191K)
2025-01-08	SELL	unknown	日髙弘義 Hiroyoshi Hidaka	strategic	428.8K	¥169	+43.8%	¥774M ($5.0M)
2025-01-08	SELL	unknown	日髙弘義 Hiroyoshi Hidaka	strategic	428.8K	¥169	+43.8%	¥774M ($5.0M)
2025-01-08	BUY	Market Buy	日髙有一 HIDAKA YUUICHI	activist	5.0M	¥169	-43.8%	¥180M ($1.2M)
2024-12-04	SELL	Market Buy	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	3.6M	¥97	+2.1%	¥80M ($518K)
2024-11-26	BUY	Market Buy	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	4.5M	¥102	-6.9%	¥92M ($592K)
2024-11-26	SELL	Market Buy	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	4.5M	¥102	+6.9%	¥92M ($592K)
2024-11-21	SELL	Market Buy	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	5.5M	¥104	+8.7%	¥159M ($1.0M)
2024-09-26	SELL	Market Buy	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	7.3M	¥73	-30.1%	¥61M ($395K)
2024-08-29	SELL	private	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	8.3M	¥80	-18.8%	¥33M ($212K)
2024-08-19	SELL	private	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	8.8M	¥82	-15.8%	¥53M ($340K)
2024-07-23	SELL	private	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	9.6M	¥87	-9.2%	¥34M ($222K)
2024-07-04	SELL	private	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	10.1M	¥89	-6.7%	¥159M ($1.0M)
2024-06-19	SELL	private	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	12.4M	¥91	-4.4%	¥39M ($255K)
2024-06-11	SELL	Market Buy	株式会社ウィズ・パートナーズ Whiz Partners Inc.	passive	1.4M	¥89	-6.7%	¥260M ($1.7M)
2024-06-07	BUY	private	キャンターフィッツジェラルドヨーロッパ(Cantor Fitzgerald Europe) Cantor Fitzgerald Europe	passive	13.0M	¥89	+6.7%	¥1.2B ($7.5M)
2023-07-03	SELL	Market Buy	株式会社ウィズ・パートナーズ Whiz Partners Inc.	passive	4.8M	¥208	+54.3%	¥77M ($496K)
2023-06-07	SELL	Market Buy	株式会社ウィズ・パートナーズ Whiz Partners Inc.	passive	5.3M	¥214	+55.6%	¥70M ($454K)
2023-02-22	SELL	Market Buy	株式会社ウィズ・パートナーズ Whiz Partners Inc.	passive	5.7M	¥231	+58.9%	¥40M ($257K)
2023-01-06	SELL	Market Buy	株式会社ウィズ・パートナーズ Whiz Partners Inc.	passive	5.9M	¥251	+62.1%	¥99M ($640K)
2023-01-06	BUY	Market Buy	株式会社ウィズ・パートナーズ Whiz Partners Inc.	passive	5.9M	¥251	-62.1%	¥99M ($640K)
2022-12-14	SELL	Market Buy	株式会社ウィズ・パートナーズ Whiz Partners Inc.	passive	6.3M	¥255	+62.8%	¥86M ($553K)
2022-11-10	SELL	Market Buy	株式会社ウィズ・パートナーズ Whiz Partners Inc.	passive	6.7M	¥303	+68.7%	¥96M ($618K)
2022-10-12	SELL	Market Buy	株式会社ウィズ・パートナーズ Whiz Partners Inc.	passive	7.1M	¥308	+69.2%	¥94M ($609K)
2022-07-26	BUY	Market Buy	株式会社ウィズ・パートナーズ Whiz Partners Inc.	passive	7.5M	¥219	-56.6%	¥1.6B ($10.6M)
2022-05-20	SELL	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	400	¥205	+53.7%	¥443M ($2.9M)
2021-05-14	SELL	unknown	日髙有一 HIDAKA YUUICHI	activist	2.8M	¥285	+66.7%	¥155M ($999K)

Frequently asked questions

Who has been buying D. Western Therapeutics Institute, Inc. stock?: 7 distinct investors have filed 4 disclosed large-shareholding filings in D. Western Therapeutics Institute, Inc. (4576), most recently on 2026-05-13. 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 D. Western Therapeutics Institute, Inc. have?: D. Western Therapeutics Institute, Inc. has 4 buy-side and 37 sell-side disclosures on record, covering ¥4.2B ($27.4M) in total reported value, spanning 2021-05-14 to 2026-05-13.
Where does StockDrifts get D. Western Therapeutics Institute, 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 D. Western Therapeutics Institute, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.