Who has been buying Japan Investment Adviser Co., Ltd. stock?

2 distinct investors have filed 11 disclosed large-shareholding filings in Japan Investment Adviser Co., Ltd. (7172), 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 Japan Investment Adviser Co., Ltd. have?

Japan Investment Adviser Co., Ltd. has 11 buy-side and 16 sell-side disclosures on record, covering ¥14.1B ($91.1M) in total reported value, spanning 2021-12-01 to 2026-05-12.

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.

Japan Investment Adviser Co., Ltd. 7172

Company

株式会社ジャパンインベストメントアドバイザーJapan Investment Adviser Co., Ltd.

Investors

Buys

Total Value

¥14.1B ($91.1M)

Avg Return

+130.15%

Last Filing

2026-05-12

Japan Investment Adviser Co., Ltd. (7172) has 11 disclosed large-shareholding filings and 16 disclosed disposals on record, filed by 2 distinct investors. Together those filings cover ¥14.1B ($91.1M) in reported transaction value. The earliest filing StockDrifts holds for Japan Investment Adviser Co., Ltd. is dated 2021-12-01; the most recent is 2026-05-12. Across these filings the average return since disclosure is +130.15%, 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
2026-08-07	BUY	unknown	株式会社こうどうホールディングス KODO Holdings Co., Ltd.	activist	21.7M	¥2,009	-	-
2026-06-15	SELL	unknown	白岩直人	activist	0	¥2,050	-4.3%	¥21.8B ($140.5M)
2026-06-15	SELL	unknown	株式会社こうどうホールディングス	activist	21.7M	¥2,050	-4.3%	¥789M ($5.1M)
2026-06-10	BUY	private	双日株式会社 Sojitz Corporation	activist	12.4M	¥2,010	+6.4%	¥2.7B ($17.7M)
2026-05-29	BUY	unknown	白岩直人	activist	10.4M	¥2,075	-	-
2026-05-29	BUY	unknown	株式会社こうどうホールディングス	activist	21.7M	¥2,075	-	-
2026-05-26	BUY	private	双日株式会社 Sojitz Corporation	activist	10.8M	¥2,111	-	¥22.9B ($147.6M)
2026-05-26	BUY	private	双日株式会社 Sojitz Corporation	activist	10.8M	¥2,111	+1.3%	¥22.9B ($147.6M)
2026-05-12	SELL	unknown	白岩直人	activist	10.4M	¥2,111	-1.3%	¥1.1B ($6.9M)
2026-05-12	BUY	Market Buy	株式会社こうどうホールディングス	activist	21.7M	¥2,111	+1.3%	¥13M ($83K)
2025-09-25	SELL	unknown	白岩直人 Naoto Shiraiwa	activist	10.9M	¥1,985	-7.7%	¥1.3B ($8.2M)
2025-09-25	SELL	unknown	白岩直人 Naoto Shiraiwa	activist	10.9M	¥1,985	-7.7%	¥1.3B ($8.2M)
2025-09-25	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	21.7M	¥1,985	-	-
2025-09-25	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	21.7M	¥1,985	-	-
2025-09-01	SELL	unknown	白岩直人 Naoto Shiraiwa	activist	11.6M	¥1,855	-15.3%	¥1.2B ($7.6M)
2025-09-01	SELL	unknown	白岩直人 Naoto Shiraiwa	activist	11.6M	¥1,855	-15.3%	¥1.2B ($7.6M)
2025-09-01	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	21.7M	¥1,855	-	-
2025-09-01	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	21.7M	¥1,855	-	-
2025-02-26	SELL	unknown	白岩直人 Naoto Shiraiwa	activist	12.2M	¥1,808	-18.3%	¥1.2B ($7.7M)
2025-02-26	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	21.7M	¥1,808	-	-
2024-07-04	BUY	unknown	白岩直人 Naoto Shiraiwa	activist	12.9M	¥1,708	-	-
2024-07-04	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	21.7M	¥1,708	-	-
2024-03-26	SELL	unknown	白岩直人 Naoto Shiraiwa	activist	12.9M	¥1,039	-105.8%	¥184M ($1.2M)
2024-03-26	SELL	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	21.7M	¥1,039	-105.8%	¥304M ($2.0M)
2024-03-21	SELL	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	21.7M	¥1,068	-100.2%	¥1.5B ($9.6M)
2024-03-21	SELL	unknown	白岩直人 Naoto Shiraiwa	activist	12.9M	¥1,068	-100.2%	¥881M ($5.7M)
2024-03-11	SELL	subscription	白岩直人 Naoto Shiraiwa	activist	12.9M	¥909	-135.2%	¥7.9B ($50.9M)
2024-03-11	SELL	subscription	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	21.7M	¥909	-135.2%	¥5.0B ($32.5M)
2024-01-29	SELL	unknown	白岩直人 Naoto Shiraiwa	activist	12.9M	¥875	-144.3%	¥2.8B ($18.2M)
2024-01-29	SELL	unknown	白岩直人 Naoto Shiraiwa	activist	12.9M	¥875	-144.3%	¥2.8B ($18.2M)
2024-01-29	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	21.7M	¥875	+144.3%	¥2.5B ($16.2M)
2024-01-29	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	21.7M	¥875	+144.3%	¥2.5B ($16.2M)
2024-01-24	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	14.8M	¥841	+154.2%	¥3.8B ($24.6M)
2024-01-24	BUY	unknown	白岩直人 Naoto Shiraiwa	activist	19.8M	¥841	+154.2%	¥4.3B ($27.6M)
2024-01-24	BUY	Market Buy	白岩直人 Naoto Shiraiwa	activist	19.8M	¥841	+154.2%	¥4.3B ($27.6M)
2024-01-24	BUY	Market Buy	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	14.8M	¥841	+154.2%	¥3.8B ($24.6M)
2024-01-19	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	7.4M	¥807	-	-
2024-01-19	BUY	unknown	白岩直人 Naoto Shiraiwa	activist	9.9M	¥807	-	-
2024-01-16	BUY	unknown	白岩直人 Naoto Shiraiwa	activist	9.9M	¥1,080	-	-
2024-01-16	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	7.4M	¥1,080	-	-
2024-01-09	SELL	unknown	白岩直人 Naoto Shiraiwa	activist	9.9M	¥946.43	-125.9%	¥29M ($188K)
2024-01-09	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	7.4M	¥946.43	+125.9%	¥268M ($1.7M)
2024-01-04	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	5.4M	¥873.86	-	¥423M ($2.7M)
2024-01-04	BUY	unknown	株式会社こうどうホールディングス Kodo Holdings Co., Ltd.	activist	5.4M	¥873.86	-	-
2024-01-04	BUY	unknown	白岩直人 Naoto Shiraiwa	activist	10.9M	¥873.86	-	-
2024-01-04	BUY	unknown	白岩直人 Naoto Shiraiwa	activist	10.9M	¥873.86	-	¥470M ($3.0M)
2023-12-27	BUY	unknown	白岩直人 Naoto Shiraiwa	activist	11.4M	¥922.24	-	¥25M ($163K)
2023-12-27	BUY	unknown	白岩直人 Naoto Shiraiwa	activist	11.4M	¥922.24	-	¥1.1B ($6.9M)
2023-12-27	BUY	unknown	白岩直人 Naoto Shiraiwa	activist	11.4M	¥922.24	-	¥25M ($163K)
2023-12-27	BUY	unknown	白岩直人 Naoto Shiraiwa	activist	11.4M	¥922.24	-	-

Showing the 50 most recent of 64 filings.

Frequently asked questions

Who has been buying Japan Investment Adviser Co., Ltd. stock?: 2 distinct investors have filed 11 disclosed large-shareholding filings in Japan Investment Adviser Co., Ltd. (7172), 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 Japan Investment Adviser Co., Ltd. have?: Japan Investment Adviser Co., Ltd. has 11 buy-side and 16 sell-side disclosures on record, covering ¥14.1B ($91.1M) in total reported value, spanning 2021-12-01 to 2026-05-12.
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.