Who has been buying Ascentech K.K. stock?

16 distinct investors have filed 37 disclosed large-shareholding filings in Ascentech K.K. (3565), most recently on 2026-04-21. 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 Ascentech K.K. have?

Ascentech K.K. has 37 buy-side and 33 sell-side disclosures on record, covering ¥21.5B ($138.7M) in total reported value, spanning 2021-04-20 to 2026-04-21.

Where does StockDrifts get Ascentech 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.

Ascentech K.K. 3565

Company

アセンテック株式会社Ascentech K.K.

Investors

Buys

Total Value

¥21.5B ($138.7M)

Avg Return

+33.93%

Last Filing

2026-04-21

Ascentech K.K. (3565) has 37 disclosed large-shareholding filings and 33 disclosed disposals on record, filed by 16 distinct investors. Together those filings cover ¥21.5B ($138.7M) in reported transaction value. The earliest filing StockDrifts holds for Ascentech K.K. is dated 2021-04-20; the most recent is 2026-04-21. 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 +33.93%, 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
2026-06-26	BUY	Market Buy	古屋雅章 MASAAKI FURUYA	passive	2.8M	¥379	+11.1%	¥207M ($1.3M)
2026-06-23	BUY	Market Buy	古屋雅章 MASAAKI FURUYA	passive	2.2M	¥349	+18.1%	¥769M ($5.0M)
2026-06-04	BUY	unknown	佐藤直浩 Naohiro Sato	activist	3.0M	¥487	-13.8%	¥1.5B ($9.4M)
2026-04-21	BUY	Market Buy	野村アセットマネジメント株式会社	other	251.6K	¥443.667	+7.7%	¥52M ($334K)
2026-04-21	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	348.8K	¥443.667	-7.7%	¥49M ($317K)
2026-04-21	SELL	unknown	野村證券株式会社	other	38.4K	¥443.667	-7.7%	¥69M ($447K)
2026-03-06	SELL	unknown	松浦崇 Takashi Matsuura	activist	747.0K	¥1,257	-5.3%	¥137M ($887K)
2026-02-19	BUY	unknown	野村アセットマネジメント株式会社	other	135.4K	¥1,342	-1.4%	¥179M ($1.2M)
2026-02-19	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	459.3K	¥1,342	-1.4%	¥608M ($3.9M)
2026-02-19	SELL	unknown	野村證券株式会社	other	193.3K	¥1,342	+1.4%	¥256M ($1.6M)
2026-02-06	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	815.7K	¥1,412	-6.3%	¥1.2B ($7.4M)
2025-09-24	SELL	unknown	佐藤直浩 Naohiro Sato	activist	1.0M	¥1,612	+17.9%	¥773M ($5.0M)
2025-09-24	SELL	unknown	永森信一 Shinichi Nagamori	strategic	431.6K	¥1,612	+17.9%	¥4.6B ($29.6M)
2025-09-24	BUY	unknown	合同会社ルビィ ruby	other	3.3M	¥1,612	-17.9%	¥5.4B ($34.6M)
2025-09-01	BUY	unknown	佐藤直浩 Naohiro Sato	activist	1.5M	¥1,780	-25.7%	¥2.6B ($17.0M)
2025-08-20	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	43.7K	¥1,681	+21.3%	¥216M ($1.4M)
2025-08-20	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	188.2K	¥1,681	-21.3%	¥316M ($2.0M)
2025-08-20	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	213.3K	¥1,681	+21.3%	¥422M ($2.7M)
2025-08-12	BUY	unknown	永森信一 Shinichi Nagamori	strategic	3.3M	¥1,839	-28.1%	¥6.0B ($38.9M)
2025-08-06	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	188.3K	¥1,674	-21.0%	¥315M ($2.0M)
2025-08-06	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	463.7K	¥1,674	-21.0%	¥776M ($5.0M)
2025-08-06	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	172.2K	¥1,674	-21.0%	¥288M ($1.9M)
2025-07-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	318.6K	¥1,679	-21.2%	¥525M ($3.4M)
2025-07-07	SELL	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	602	¥1,679	+21.2%	¥218M ($1.4M)
2025-07-07	SELL	Market Buy	SBIアセットマネジメント株式会社 SBI Asset Management Co., Ltd.	passive	560.0K	¥1,679	+21.2%	¥135M ($869K)
2025-07-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	144.9K	¥1,679	-21.2%	¥9.5B ($61.6M)
2025-06-23	SELL	unknown	永森信一 Shinichi Nagamori	strategic	3.3M	¥1,728	+23.4%	¥522M ($3.4M)
2025-06-05	SELL	unknown	佐藤直浩 Naohiro Sato	activist	1.5M	¥1,433	+7.7%	¥251M ($1.6M)
2025-04-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	644.1K	¥1,174	+12.7%	¥756M ($4.9M)
2025-04-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	88.0K	¥1,174	+12.7%	¥103M ($667K)
2025-03-07	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	126.5K	¥1,060	+24.8%	¥134M ($865K)
2025-03-07	BUY	Market Buy	SBIアセットマネジメント株式会社 SBI Asset Management Co., Ltd.	passive	626.0K	¥1,060	+24.8%	¥664M ($4.3M)
2024-04-19	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	193.2K	¥517	-155.9%	¥27M ($176K)
2024-04-19	BUY	unknown	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	182.5K	¥517	+155.9%	¥91M ($589K)
2024-04-04	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	246.8K	¥533	-148.2%	¥76M ($489K)
2024-04-04	SELL	unknown	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	605.7K	¥533	-148.2%	¥43M ($279K)
2023-05-09	SELL	unknown	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	686.0K	¥572	-131.3%	¥83M ($535K)
2023-05-09	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	388.9K	¥572	+131.3%	¥12M ($75K)
2022-11-04	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	210.2K	¥506	-161.5%	¥8M ($49K)
2022-11-04	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	309.8K	¥506	+161.5%	¥10M ($62K)
2022-11-04	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	136.5K	¥506	-161.5%	¥75M ($486K)
2022-09-22	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	224.9K	¥593	+123.1%	¥133M ($860K)
2022-09-22	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	291.1K	¥593	-123.1%	¥14M ($88K)
2022-09-22	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	285.7K	¥593	-123.1%	¥36M ($233K)
2022-08-18	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	225.3K	¥660	+100.5%	¥4M ($23K)
2022-08-18	SELL	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	313.9K	¥660	-100.5%	¥93M ($599K)
2022-08-18	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	346.9K	¥660	+100.5%	¥69M ($444K)
2022-06-21	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	219.7K	¥623	+112.4%	¥4M ($27K)
2022-06-21	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	454.3K	¥623	-112.4%	¥10M ($65K)
2022-06-21	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	242.3K	¥623	-112.4%	¥24M ($152K)

Showing the 50 most recent of 86 filings.

Frequently asked questions

Who has been buying Ascentech K.K. stock?: 16 distinct investors have filed 37 disclosed large-shareholding filings in Ascentech K.K. (3565), most recently on 2026-04-21. 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 Ascentech K.K. have?: Ascentech K.K. has 37 buy-side and 33 sell-side disclosures on record, covering ¥21.5B ($138.7M) in total reported value, spanning 2021-04-20 to 2026-04-21.
Where does StockDrifts get Ascentech 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 Ascentech K.K.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.