Who has been buying Harima B.Stem Corporation stock?

6 distinct investors have filed 7 disclosed large-shareholding filings in Harima B.Stem Corporation (9780), most recently on 2026-04-07. 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 Harima B.Stem Corporation have?

Harima B.Stem Corporation has 7 buy-side and 4 sell-side disclosures on record, covering ¥2.2B ($14.1M) in total reported value, spanning 2021-12-09 to 2026-04-07.

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.

Harima B.Stem Corporation 9780

Company

株式会社ハリマビステムHarima B.Stem Corporation

Investors

Buys

Total Value

¥2.2B ($14.1M)

Avg Return

+72.00%

Last Filing

2026-04-07

Harima B.Stem Corporation (9780) has 7 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥2.2B ($14.1M) in reported transaction value. The earliest filing StockDrifts holds for Harima B.Stem Corporation is dated 2021-12-09; the most recent is 2026-04-07. Across these filings the average return since disclosure is +72.00%, 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
2026-09-17	SELL	unknown	鴻義久 OHTORI YOSHIHISA	activist	244.4K	¥1,130	-1.9%	¥396M ($2.6M)
2026-08-20	BUY	Market Buy	株式会社UH Partners 2	passive	207.3K	¥1,102	+4.5%	¥108M ($698K)
2026-08-20	BUY	Market Buy	光通信株式会社	passive	669.5K	¥1,102	-	-
2026-08-06	BUY	unknown	鴻義久 OHTORI YOSHIHISA	activist	594.5K	¥922	+24.9%	¥548M ($3.5M)
2026-04-07	SELL	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	381.7K	¥965	-19.4%	¥193M ($1.2M)
2025-09-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	669.5K	¥856	-	-
2025-09-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	108.8K	¥856	+34.6%	¥82M ($526K)
2025-06-09	BUY	negotiated	株式会社横浜銀行 The Bank of Yokohama. Ltd	strategic	247.2K	¥743	+55.0%	¥184M ($1.2M)
2025-06-09	BUY	negotiated	横浜キャピタル株式会社 Yokohama Capital	passive	2.4M	¥743	+55.0%	¥1.8B ($11.3M)
2025-04-22	SELL	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	582.6K	¥700	-64.6%	¥69M ($448K)
2024-12-20	SELL	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	681.4K	¥700	-64.6%	¥69M ($448K)
2023-12-15	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	2.6K	¥659	-	¥2M ($11K)
2023-12-15	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	133.9K	¥659	+74.8%	¥11M ($71K)
2022-03-30	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	58.6K	¥441	+161.2%	¥5M ($30K)
2022-03-04	SELL	unknown	有限会社おおとり Ootori Company Limited	activist	154.8K	¥428	-169.2%	¥21M ($138K)
2022-02-15	BUY	unknown	有限会社おおとり Ootori Company Limited	activist	805.8K	¥410.5	+180.6%	¥331M ($2.1M)
2021-12-09	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	48.2K	¥422	+173.0%	¥20M ($131K)

Frequently asked questions

Who has been buying Harima B.Stem Corporation stock?: 6 distinct investors have filed 7 disclosed large-shareholding filings in Harima B.Stem Corporation (9780), most recently on 2026-04-07. 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 Harima B.Stem Corporation have?: Harima B.Stem Corporation has 7 buy-side and 4 sell-side disclosures on record, covering ¥2.2B ($14.1M) in total reported value, spanning 2021-12-09 to 2026-04-07.
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.