Who has been buying Harmonic Drive Systems Inc. stock?

14 distinct investors have filed 56 disclosed large-shareholding filings in Harmonic Drive Systems Inc. (6324), most recently on 2025-07-29. 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 Harmonic Drive Systems Inc. have?

Harmonic Drive Systems Inc. has 56 buy-side and 32 sell-side disclosures on record, covering ¥159.1B ($1.0B) in total reported value, spanning 2021-04-22 to 2025-07-29.

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.

Harmonic Drive Systems Inc. 6324

Company

株式会社ハーモニック・ドライブ・システムズHarmonic Drive Systems Inc.

Investors

Buys

Total Value

¥159.1B ($1.0B)

Avg Return

+12.70%

Last Filing

2025-07-29

Harmonic Drive Systems Inc. (6324) has 56 disclosed large-shareholding filings and 32 disclosed disposals on record, filed by 14 distinct investors. Together those filings cover ¥159.1B ($1.0B) in reported transaction value. The earliest filing StockDrifts holds for Harmonic Drive Systems Inc. is dated 2021-04-22; the most recent is 2025-07-29. Across these filings the average return since disclosure is +12.70%, 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
2025-07-29	BUY	negotiated	株式会社KODENホールディングス KODEN Holdings Co., Ltd.	activist	33.5M	¥2,868	-	-
2025-07-11	BUY	negotiated	株式会社KODENホールディングス KODEN Holdings Co., Ltd.	activist	33.5M	¥2,537	-	-
2025-04-07	SELL	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	3.1M	¥2,568	-141.4%	¥1.5B ($9.4M)
2025-04-07	SELL	Market Buy	キャピタル・インターナショナル株式会社 Capital International Co., Ltd.	passive	331.0K	¥2,568	-141.4%	¥1.3B ($8.5M)
2025-04-07	SELL	Market Buy	キャピタル・インターナショナル・インク(Capital International Capital International, Inc.	passive	203.1K	¥2,568	-141.4%	¥396M ($2.6M)
2025-04-07	SELL	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	125.0K	¥2,568	-141.4%	¥297M ($1.9M)
2024-12-06	SELL	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	3.7M	¥2,075	-198.8%	¥2.8B ($17.8M)
2024-12-06	BUY	Market Buy	キャピタル・インターナショナル株式会社 Capital International Co., Ltd.	passive	840.8K	¥2,075	+198.8%	¥959M ($6.2M)
2024-12-06	BUY	Market Buy	キャピタル・インターナショナル・インク(Capital International Capital International, Inc.	passive	352.2K	¥2,075	+198.8%	¥420M ($2.7M)
2024-12-06	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	236.2K	¥2,075	+198.8%	¥280M ($1.8M)
2024-11-22	SELL	Market Buy	ティー・ロウ・プライス・アソシエイツ,インク(T. Rowe Price Associates, Inc.) T. Rowe Price Associates, Inc.	passive	4.1M	¥1,882	-229.4%	¥5.2B ($33.4M)
2024-11-08	SELL	Market Buy	ティー・ロウ・プライス・アソシエイツ,インク(T. Rowe Price Associates, Inc.) T. Rowe Price Associates, Inc.	passive	6.9M	¥2,742	-126.1%	¥6.0B ($38.7M)
2024-09-06	BUY	Market Buy	ティー・ロウ・プライス・アソシエイツ,インク(T. Rowe Price Associates, Inc.) T. Rowe Price Associates, Inc.	passive	9.1M	¥3,115	+99.0%	¥3.5B ($22.3M)
2024-08-22	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	5.0M	¥3,905	+58.8%	¥19.2B ($124.2M)
2024-08-22	SELL	Market Buy	キャピタル・インターナショナル株式会社 Capital International Co., Ltd.	passive	371.6K	¥3,905	-58.8%	¥451M ($2.9M)
2024-08-22	BUY	Market Buy	キャピタル・インターナショナル・インク(Capital International Capital International, Inc.	passive	150.6K	¥3,905	-	¥588M ($3.8M)
2024-08-22	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	103.8K	¥3,905	-	¥405M ($2.6M)
2024-08-19	BUY	negotiated	株式会社KODENホールディングス KODEN Holdings Company Limited	activist	33.5M	¥3,920	-	-
2024-01-11	SELL	Market Buy	ティー・ロウ・プライス・ジャパン株式会社 T. Rowe Price Japan, Inc.	passive	0	¥4,005	-54.8%	¥2.0B ($12.9M)
2024-01-11	BUY	Market Buy	ティー・ロウ・プライス・アソシエイツ T. Rowe Price Associates	passive	8.0M	¥4,005	+54.8%	¥3.9B ($25.1M)
2023-12-13	BUY	negotiated	株式会社KODENホールディングス KODEN Holdings Company Limited	activist	33.5M	¥4,095	-	-
2023-10-20	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	6.0M	¥3,305	+87.6%	¥3.4B ($22.0M)
2023-10-20	BUY	Market Buy	キャピタル・インターナショナル株式会社 Capital International Co., Ltd.	passive	489.1K	¥3,305	+87.6%	¥318M ($2.1M)
2023-09-25	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	5.0M	¥3,380	+83.4%	¥16.6B ($107.1M)
2023-09-25	SELL	Market Buy	キャピタル・インターナショナル株式会社 Capital International Co., Ltd.	passive	390.3K	¥3,380	-83.4%	¥781M ($5.0M)
2023-09-25	SELL	Market Buy	キャピタル・インターナショナル・インク Capital International Inc.	other	0	¥3,380	-83.4%	¥358M ($2.3M)
2023-09-13	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	5.7M	¥3,365	+84.3%	¥357M ($2.3M)
2023-09-13	SELL	Market Buy	キャピタル・インターナショナル株式会社 Capital International Co., Ltd.	passive	626.3K	¥3,365	-84.3%	¥1.7B ($11.1M)
2023-09-13	SELL	Market Buy	キャピタル・インターナショナル・インク Capital International Inc.	passive	101.8K	¥3,365	-84.3%	¥32M ($209K)
2023-09-13	SELL	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	other	0	¥3,365	-84.3%	¥389M ($2.5M)
2023-05-10	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	2.9M	¥4,075	-52.1%	¥3.5B ($22.5M)
2023-05-10	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	9.6K	¥4,075	+52.1%	¥3.0B ($19.2M)
2023-05-10	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.2M	¥4,075	+52.1%	¥314M ($2.0M)
2023-02-22	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	3.8M	¥4,545	-36.4%	¥5.7B ($37.0M)
2023-02-22	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	235.6K	¥4,545	-36.4%	¥20.8B ($134.4M)
2023-02-22	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.1M	¥4,545	+36.4%	¥3.6B ($23.2M)
2023-02-07	BUY	Market Buy	ティー・ロウ・プライス・ジャパン株式会社 T. Rowe Price Japan, Inc.	passive	504.8K	¥4,460	-	¥2.3B ($14.5M)
2023-02-07	BUY	Market Buy	ティー・ロウ・プライス・アソシエイツ T. Rowe Price Associates	passive	7.0M	¥4,460	+39.0%	¥3.5B ($22.4M)
2022-12-22	SELL	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	5.6M	¥3,675	-68.7%	¥4.1B ($26.7M)
2022-12-22	BUY	Market Buy	キャピタル・インターナショナル株式会社 Capital International Co., Ltd.	passive	1.1M	¥3,675	+68.7%	¥814M ($5.3M)
2022-12-22	BUY	Market Buy	キャピタル・インターナショナル・インク Capital International Inc.	passive	119.4K	¥3,675	+68.7%	¥425M ($2.7M)
2022-12-22	BUY	Market Buy	キャピタル・インターナショナル・エス・エイ・アール・エル Capital International Sarl	passive	117.8K	¥3,675	+68.7%	¥425M ($2.7M)
2022-12-19	BUY	unknown	JPモルガン証券株式会社 JPMorgan Securities Japan Co., Ltd.	other	211.7K	¥3,840	-	¥813M ($5.2M)
2022-12-19	BUY	unknown	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	3.1M	¥3,840	+61.5%	¥11.9B ($76.6M)
2022-12-19	BUY	unknown	ジェー・ピー・モルガン・セキュリティーズ・エルエルシー J.P. Morgan Securities LLC	other	350.1K	¥3,840	+61.5%	¥37M ($239K)
2022-12-07	BUY	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	317.3K	¥3,640	+70.3%	¥35M ($226K)
2022-12-07	BUY	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	52.7K	¥3,640	+70.3%	¥17.3B ($111.5M)
2022-12-07	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	5.0M	¥3,640	+70.3%	¥736M ($4.7M)
2022-12-07	SELL	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー Capital Research and Management Company	passive	6.7M	¥3,640	-70.3%	¥2.7B ($17.2M)
2022-12-07	SELL	Market Buy	キャピタル・インターナショナル株式会社 Capital International Co., Ltd.	passive	911.7K	¥3,640	-70.3%	¥1.4B ($9.0M)

Showing the 50 most recent of 105 filings.

Frequently asked questions

Who has been buying Harmonic Drive Systems Inc. stock?: 14 distinct investors have filed 56 disclosed large-shareholding filings in Harmonic Drive Systems Inc. (6324), most recently on 2025-07-29. 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 Harmonic Drive Systems Inc. have?: Harmonic Drive Systems Inc. has 56 buy-side and 32 sell-side disclosures on record, covering ¥159.1B ($1.0B) in total reported value, spanning 2021-04-22 to 2025-07-29.
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.