Who has been buying Soiken Holdings Inc. stock?

7 distinct investors have filed 7 disclosed large-shareholding filings in Soiken Holdings Inc. (2385), most recently on 2025-04-14. 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 Soiken Holdings Inc. have?

Soiken Holdings Inc. has 7 buy-side and 6 sell-side disclosures on record, covering ¥26M ($168K) in total reported value, spanning 2021-03-22 to 2025-04-14.

Where does StockDrifts get Soiken Holdings 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.

Soiken Holdings Inc. 2385

Company

株式会社総医研ホールディングスSoiken Holdings Inc.

Investors

Buys

Total Value

¥26M ($168K)

Avg Return

-9.40%

Last Filing

2025-04-14

Soiken Holdings Inc. (2385) has 7 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥26M ($168K) in reported transaction value. The earliest filing StockDrifts holds for Soiken Holdings Inc. is dated 2021-03-22; the most recent is 2025-04-14. 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 -9.40%, 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
2025-04-14	BUY	Market Buy	ゴロング・ホールディング・カンパニー・リミテッド(GOLONG HOLDING CO., LIMITED) GOLONG HOLDING CO., LIMITED	activist	4.6M	¥131	+93.1%	¥25M ($161K)
2023-06-02	BUY	Market Buy	ゴロング・ホールディング・カンパニー・リミテッド(GOLONG HOLDING CO., LIMITED) GOLONG HOLDING CO., LIMITED	activist	4.4M	¥279	-9.3%	¥75M ($485K)
2023-05-31	BUY	unknown	ゴロング・ホールディング・カンパニー・リミテッド(GOLONG HOLDING CO., LIMITED) GOLONG HOLDING CO., LIMITED	other	4.2M	¥275	-8.0%	¥1.1B ($7.4M)
2022-04-14	BUY	unknown	GOLONG HOLDING CO.,LIMITED	other	4.2M	¥326	-22.4%	¥1.4B ($8.8M)
2022-04-07	SELL	negotiated	岩本さゆり Sayuri Iwamoto	unknown	0	¥321	+21.2%	¥107M ($688K)
2022-04-07	SELL	negotiated	ミストロ真里 Mystro Mari	unknown	0	¥321	+21.2%	¥107M ($688K)
2022-04-07	SELL	negotiated	株式会社GMS GMS Co., Ltd.	unknown	0	¥321	+21.2%	¥225M ($1.5M)
2022-04-07	SELL	negotiated	梶本智子 Tomoko Kajimoto	unknown	0	¥321	+21.2%	¥898M ($5.8M)
2022-04-07	BUY	negotiated	梶本修身 osami kajimoto	activist	4.4M	¥321	-21.2%	¥1.4B ($9.2M)
2021-11-24	BUY	Market Buy	岩本さゆり Sayuri Iwamoto	other	332.0K	¥371	-31.8%	¥970K ($6K)
2021-11-24	SELL	Market Buy	株式会社GMS GMS Co., Ltd.	other	702.1K	¥371	+31.8%	¥70M ($451K)
2021-11-24	BUY	Market Buy	梶本智子 Tomoko Kajimoto	other	2.8M	¥371	-31.8%	¥4M ($25K)
2021-11-24	BUY	Market Buy	梶本修身 osami kajimoto	activist	4.4M	¥371	-31.8%	¥6M ($38K)
2021-11-24	BUY	Market Buy	ミストロ真里 Mystro Mari	other	332.0K	¥371	-31.8%	¥970K ($6K)
2021-03-22	SELL	Market Buy	ベイビュー・アセット・マネジメント株式会社 Bayview Asset Management Co., Ltd.	passive	1.1M	¥554.885	+54.4%	¥203M ($1.3M)

Frequently asked questions

Who has been buying Soiken Holdings Inc. stock?: 7 distinct investors have filed 7 disclosed large-shareholding filings in Soiken Holdings Inc. (2385), most recently on 2025-04-14. 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 Soiken Holdings Inc. have?: Soiken Holdings Inc. has 7 buy-side and 6 sell-side disclosures on record, covering ¥26M ($168K) in total reported value, spanning 2021-03-22 to 2025-04-14.
Where does StockDrifts get Soiken Holdings 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 Soiken Holdings Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.