Who has been buying Hamamatsu Photonics K.K. stock?

32 distinct investors have filed 68 disclosed large-shareholding filings in Hamamatsu Photonics K.K. (6965), most recently on 2025-12-03. 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 Hamamatsu Photonics K.K. have?

Hamamatsu Photonics K.K. has 68 buy-side and 42 sell-side disclosures on record, covering ¥329.2B ($2.1B) in total reported value, spanning 2021-07-26 to 2025-12-03.

Where does StockDrifts get Hamamatsu Photonics K.K. 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.

Hamamatsu Photonics K.K. 6965

Company

浜松ホトニクス株式会社Hamamatsu Photonics K.K.

Investors

Buys

Total Value

¥329.2B ($2.1B)

Avg Return

-4.20%

Last Filing

2025-12-03

Hamamatsu Photonics K.K. (6965) has 68 disclosed large-shareholding filings and 42 disclosed disposals on record, filed by 32 distinct investors. Together those filings cover ¥329.2B ($2.1B) in reported transaction value. The earliest filing StockDrifts holds for Hamamatsu Photonics K.K. is dated 2021-07-26; the most recent is 2025-12-03. 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 -4.20%, 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
2026-08-05	BUY	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	4.0M	¥2,550	+0.5%	¥326M ($2.1M)
2026-08-05	BUY	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	770.2K	¥2,550	+0.5%	¥81M ($525K)
2026-08-05	BUY	Market Buy	ブラックロック・アセット・マネジメント・カナダ・リミテッド BlackRock Asset Management Canada Limited	passive	436.2K	¥2,550	+0.5%	¥1.1B ($7.2M)
2026-08-05	BUY	Market Buy	ブラックロック・アドバイザーズ・エルエルシー BlackRock Advisers, LLC	passive	714.2K	¥2,550	+0.5%	¥1.8B ($11.7M)
2026-08-05	BUY	Market Buy	ブラックロック・インベストメント・マネジメント(ユーケー)リミテッドLimited) BlackRock Investment Management (UK	passive	2.8M	¥2,550	+0.5%	¥896M ($5.8M)
2026-08-05	BUY	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ. BlackRock Institutional Trust Company, N.A.	passive	4.2M	¥2,550	+0.5%	¥3.2B ($20.5M)
2026-08-05	BUY	Market Buy	ブラックロック(ルクセンブルグ)エス・エーS.A.) BlackRock (Luxembourg	passive	845.7K	¥2,550	+0.5%	¥2.2B ($13.9M)
2026-08-05	SELL	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	430.3K	¥2,550	-0.5%	¥163M ($1.1M)
2026-08-05	SELL	Market Buy	ブラックロック・ジャパン株式会社	passive	5.5M	¥2,550	-0.5%	¥651M ($4.2M)
2025-12-03	BUY	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ.(BlackRock Institutional Trust Company	passive	3.0M	¥1,557.5	+25.3%	¥5.8B ($37.4M)
2025-12-03	BUY	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	3.8M	¥1,557.5	+25.3%	¥7.5B ($48.5M)
2025-12-03	BUY	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	734.3K	¥1,557.5	+25.3%	¥1.4B ($9.2M)
2025-12-03	BUY	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	463.2K	¥1,557.5	+25.3%	¥904M ($5.8M)
2025-12-03	BUY	Market Buy	ブラックロック・ジャパン株式会社	passive	5.8M	¥1,557.5	+25.3%	¥11.2B ($72.5M)
2025-12-03	BUY	Market Buy	ブラックロック・インベストメント・マネジメント(ユーケー)リミテッドLimited) BlackRock Investment Management (UK	passive	2.5M	¥1,557.5	+25.3%	¥4.9B ($31.5M)
2025-10-07	SELL	unknown	ゴールドマン・サックス・アセット・マネジメント・インターナショナル Goldman Sachs Asset Management International	other	5.3M	¥1,675	-16.5%	¥6.5B ($41.7M)
2025-10-07	SELL	unknown	ゴールドマン・サックス・アセット・マネジメント・エル・ピー(Goldman Sachs Asset Management Goldman Sachs Asset Management	other	527.7K	¥1,675	-16.5%	¥855M ($5.5M)
2025-10-07	SELL	unknown	ゴールドマン・サックス・アセット・マネジメント株式会社 Goldman Sachs Asset Management Co., Ltd.	other	4.2M	¥1,675	-16.5%	¥2.2B ($14.5M)
2025-10-07	SELL	unknown	ゴールドマン・サックス・アンド・カンパニー・エルエルシー Goldman Sachs & Co. LLC	other	11.5K	¥1,675	-16.5%	¥5.3B ($34.5M)
2025-10-07	BUY	unknown	ゴールドマン・サックス・インターナショナル Goldman Sachs International	other	1.7M	¥1,675	+16.5%	¥1.1B ($7.2M)
2025-10-07	BUY	unknown	ゴールドマン・サックス証券株式会社 Goldman Sachs Japan Co.,Ltd.	other	927.2K	¥1,675	+16.5%	¥155.0B ($1.0B)
2025-09-19	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	12.7M	¥1,609	+21.3%	¥5.5B ($35.8M)
2025-09-19	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	8.7M	¥1,609	+21.3%	¥308M ($2.0M)
2025-05-09	SELL	Market Buy	ティー・ロウ・プライス・インターナショナル・リミテッド T. Rowe Price International Ltd.	passive	6.1M	¥1,342	-45.5%	¥8.1B ($52.2M)
2025-05-09	BUY	Market Buy	ティー・ロウ・プライス・アソシエイツ T. Rowe Price Associates	passive	8.5M	¥1,342	+45.5%	¥214M ($1.4M)
2025-04-21	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	9.5M	¥1,156.5	+68.8%	¥5.2B ($33.3M)
2025-04-21	SELL	Market Buy	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	8.9M	¥1,156.5	-68.8%	¥3.4B ($22.2M)
2025-04-07	BUY	Market Buy	ティー・ロウ・プライス・アソシエイツ T. Rowe Price Associates	passive	8.7M	¥1,159.5	+68.3%	¥77M ($494K)
2025-04-07	BUY	Market Buy	ティー・ロウ・プライス・インターナショナル・リミテッド T. Rowe Price International Ltd.	passive	12.6M	¥1,159.5	+68.3%	¥230M ($1.5M)
2025-04-07	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	12.0M	¥1,159.5	+68.3%	¥13.7B ($88.6M)
2025-04-07	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	368.2K	¥1,159.5	-68.3%	¥3.2B ($20.8M)
2025-04-07	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.2M	¥1,159.5	+68.3%	¥137.8B ($889.3M)
2025-04-07	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	¥1,159.5	-68.3%	¥53.6B ($345.8M)
2024-12-06	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	13.8M	¥1,838	+6.2%	¥25.4B ($163.8M)
2024-12-06	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	3.1M	¥1,838	+6.2%	¥5.8B ($37.3M)
2024-12-06	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	-1.2K	¥1,838	+6.2%	-
2024-12-06	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	470.4K	¥1,838	+6.2%	¥865M ($5.6M)
2024-12-06	BUY	Market Buy	ティー・ロウ・プライス・アソシエイツ T. Rowe Price Associates	passive	8.6M	¥1,838	+6.2%	¥182M ($1.2M)
2024-12-06	BUY	Market Buy	ティー・ロウ・プライス・インターナショナル・リミテッド T. Rowe Price International Ltd.	passive	12.3M	¥1,838	+6.2%	¥6.7B ($43.5M)
2024-12-05	BUY	Market Buy	ブラックロック(ルクセンブルグ)エス・エーS.A.) BlackRock (Luxembourg	passive	812.1K	¥1,832.5	+6.5%	¥424M ($2.7M)
2024-12-05	SELL	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ.(BlackRock Institutional Trust Company BlackRock Institutional Trust Company, N.A.	passive	2.8M	¥1,832.5	-6.5%	¥2.5B ($16.0M)
2024-12-05	SELL	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	3.5M	¥1,832.5	-6.5%	¥3.4B ($22.2M)
2024-12-05	SELL	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	607.9K	¥1,832.5	-6.5%	¥3.3B ($21.5M)
2024-12-05	BUY	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	754.7K	¥1,832.5	+6.5%	¥61M ($390K)
2024-12-05	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	135.4K	¥1,832.5	+6.5%	¥23.1B ($148.7M)
2024-12-05	SELL	Market Buy	ブラックロック・インベストメント・マネジメント (オーストラリア)リミテッドLimited) BlackRock Investment Management (Australia	passive	2.2K	¥1,832.5	-6.5%	¥1.0B ($6.6M)
2024-12-05	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	6.0M	¥1,832.5	+6.5%	¥61M ($390K)
2024-11-08	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	469.3K	¥2,024	-3.6%	¥950M ($6.1M)
2024-11-08	BUY	Market Buy	ティー・ロウ・プライス・アソシエイツ T. Rowe Price Associates	passive	8.5M	¥2,024	-3.6%	¥17.2B ($110.8M)
2024-11-08	BUY	Market Buy	ティー・ロウ・プライス・インターナショナル・リミテッド T. Rowe Price International Ltd.	passive	8.7M	¥2,024	-3.6%	¥17.6B ($113.3M)

Showing the 50 most recent of 131 filings.

Frequently asked questions

Who has been buying Hamamatsu Photonics K.K. stock?: 32 distinct investors have filed 68 disclosed large-shareholding filings in Hamamatsu Photonics K.K. (6965), most recently on 2025-12-03. 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 Hamamatsu Photonics K.K. have?: Hamamatsu Photonics K.K. has 68 buy-side and 42 sell-side disclosures on record, covering ¥329.2B ($2.1B) in total reported value, spanning 2021-07-26 to 2025-12-03.
Where does StockDrifts get Hamamatsu Photonics K.K. 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 Hamamatsu Photonics K.K.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.