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.

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. 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	+70.2%	¥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	-20.1%	¥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	-	-
2022-04-14	BUY	unknown	GOLONG HOLDING CO.,LIMITED	other	4.2M	¥326	-31.6%	¥1.4B ($8.8M)
2022-04-07	SELL	negotiated	岩本さゆり Sayuri Iwamoto	unknown	0	¥321	+30.5%	¥107M ($688K)
2022-04-07	BUY	negotiated	梶本修身 osami kajimoto	activist	4.4M	¥321	-	-
2022-04-07	SELL	negotiated	梶本智子 Tomoko Kajimoto	unknown	0	¥321	+30.5%	¥898M ($5.8M)
2022-04-07	SELL	negotiated	株式会社GMS GMS Co., Ltd.	unknown	0	¥321	+30.5%	¥225M ($1.5M)
2022-04-07	SELL	negotiated	ミストロ真里 Mystro Mari	unknown	0	¥321	+30.5%	¥107M ($688K)
2021-11-24	BUY	Market Buy	梶本修身 osami kajimoto	activist	4.4M	¥371	-39.9%	¥6M ($38K)
2021-11-24	BUY	Market Buy	梶本智子 Tomoko Kajimoto	other	2.8M	¥371	-39.9%	¥4M ($25K)
2021-11-24	SELL	Market Buy	株式会社GMS GMS Co., Ltd.	other	702.1K	¥371	+39.9%	¥70M ($451K)
2021-11-24	BUY	Market Buy	岩本さゆり Sayuri Iwamoto	other	332.0K	¥371	-39.9%	¥970K ($6K)
2021-11-24	BUY	Market Buy	ミストロ真里 Mystro Mari	other	332.0K	¥371	-39.9%	¥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	+59.8%	¥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.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.