Who has been buying Astena Holdings Co., Ltd. stock?

6 distinct investors have filed 18 disclosed large-shareholding filings in Astena Holdings Co., Ltd. (8095), most recently on 2025-10-20. 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 Astena Holdings Co., Ltd. have?

Astena Holdings Co., Ltd. has 18 buy-side and 33 sell-side disclosures on record, covering ¥993M ($6.4M) in total reported value, spanning 2021-03-30 to 2025-10-20.

Where does StockDrifts get Astena Holdings Co., Ltd. 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.

Astena Holdings Co., Ltd. 8095

Company

イワキ株式会社Astena Holdings Co., Ltd.

Investors

Buys

Total Value

¥993M ($6.4M)

Avg Return

-6.42%

Last Filing

2025-10-20

Astena Holdings Co., Ltd. (8095) has 18 disclosed large-shareholding filings and 33 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥993M ($6.4M) in reported transaction value. The earliest filing StockDrifts holds for Astena Holdings Co., Ltd. is dated 2021-03-30; the most recent is 2025-10-20. 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 -6.42%, 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
2025-10-20	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	96.0K	¥478	+2.9%	¥46M ($296K)
2025-10-20	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	257.5K	¥478	+2.9%	¥4M ($25K)
2025-10-20	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	686.3K	¥478	+2.9%	¥20M ($127K)
2025-10-20	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	665.7K	¥478	-2.9%	¥251M ($1.6M)
2024-12-16	SELL	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	38.4K	¥480	-2.5%	¥275M ($1.8M)
2024-12-16	SELL	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	249.4K	¥480	-2.5%	¥2M ($13K)
2024-12-16	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	642.3K	¥480	+2.5%	¥4M ($25K)
2024-12-16	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.2M	¥480	+2.5%	¥571M ($3.7M)
2024-11-18	BUY	Market Buy	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	610.0K	¥498	-1.2%	¥245M ($1.6M)
2024-11-18	BUY	Market Buy	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	253.7K	¥498	-1.2%	¥4M ($26K)
2024-11-18	BUY	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	633.8K	¥498	-1.2%	¥20M ($132K)
2024-11-18	BUY	Market Buy	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.2M	¥498	-1.2%	¥592M ($3.8M)
2024-07-29	SELL	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	119.2K	¥565	+12.9%	¥7M ($45K)
2024-07-29	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	246.8K	¥565	-12.9%	¥139M ($900K)
2024-07-29	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	594.0K	¥565	-12.9%	¥25M ($164K)
2024-07-29	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.2M	¥565	-12.9%	¥672M ($4.3M)
2024-07-01	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	133.2K	¥545	-9.7%	¥73M ($468K)
2024-07-01	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	245.6K	¥545	-9.7%	¥134M ($864K)
2024-07-01	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	548.6K	¥545	-9.7%	¥299M ($1.9M)
2024-07-01	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.2M	¥545	-9.7%	¥648M ($4.2M)
2022-01-21	SELL	Market Buy	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	62.1K	¥388	-26.8%	¥136M ($875K)
2022-01-21	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.3M	¥388	+26.8%	¥511M ($3.3M)
2021-12-20	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	535.9K	¥474	-3.8%	¥212M ($1.4M)
2021-12-20	SELL	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	162.7K	¥474	-3.8%	¥19M ($124K)
2021-12-20	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.2M	¥474	-3.8%	¥83M ($534K)
2021-12-07	BUY	Market Buy	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	409.8K	¥497	-1.0%	¥204M ($1.3M)
2021-12-07	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.7M	¥497	-1.0%	¥838M ($5.4M)
2021-07-26	SELL	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	80.2K	¥567	+13.2%	¥548M ($3.5M)
2021-07-26	BUY	unknown	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.6M	¥567	-13.2%	¥9M ($57K)
2021-07-07	SELL	subscription	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.6M	¥652	+24.5%	¥33M ($211K)
2021-07-07	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	1.1M	¥652	+24.5%	¥398M ($2.6M)
2021-06-22	BUY	subscription	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.6M	¥655	-24.9%	¥1.1B ($6.8M)
2021-06-22	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	1.7M	¥655	+24.9%	¥339M ($2.2M)
2021-06-07	SELL	subscription	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.6M	¥665	+26.0%	¥3M ($16K)
2021-06-07	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	2.3M	¥665	+26.0%	¥289M ($1.9M)
2021-05-31	SELL	subscription	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.6M	¥695	+29.2%	¥85M ($546K)
2021-05-31	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	2.7M	¥695	+29.2%	¥56M ($358K)
2021-05-21	SELL	subscription	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.6M	¥688	+28.5%	¥51M ($330K)
2021-05-21	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	2.7M	¥688	+28.5%	¥200M ($1.3M)
2021-05-12	BUY	subscription	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.7M	¥703	-30.0%	¥1.2B ($7.7M)
2021-05-12	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	3.0M	¥703	+30.0%	¥112M ($722K)
2021-05-10	SELL	subscription	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.7M	¥759	+35.2%	¥11M ($69K)
2021-05-10	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	3.2M	¥759	+35.2%	¥333M ($2.1M)
2021-05-07	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	11.2K	¥765	-35.7%	¥626M ($4.0M)
2021-05-07	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	175.8K	¥765	-35.7%	¥87M ($559K)
2021-05-07	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	857.7K	¥765	+35.7%	¥149M ($961K)
2021-05-07	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.2M	¥765	+35.7%	¥24M ($157K)
2021-04-28	SELL	subscription	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.7M	¥721	+31.8%	¥8M ($49K)
2021-04-28	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	3.7M	¥721	+31.8%	¥276M ($1.8M)
2021-04-26	SELL	subscription	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.7M	¥748	+34.2%	¥21M ($136K)

Showing the 50 most recent of 59 filings.

Frequently asked questions

Who has been buying Astena Holdings Co., Ltd. stock?: 6 distinct investors have filed 18 disclosed large-shareholding filings in Astena Holdings Co., Ltd. (8095), most recently on 2025-10-20. 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 Astena Holdings Co., Ltd. have?: Astena Holdings Co., Ltd. has 18 buy-side and 33 sell-side disclosures on record, covering ¥993M ($6.4M) in total reported value, spanning 2021-03-30 to 2025-10-20.
Where does StockDrifts get Astena Holdings Co., Ltd. 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 Astena Holdings Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.