Who has been buying JACCS Co., Ltd. stock?

6 distinct investors have filed 4 disclosed large-shareholding filings in JACCS Co., Ltd. (8584), most recently on 2025-09-24. 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 JACCS Co., Ltd. have?

JACCS Co., Ltd. has 4 buy-side and 6 sell-side disclosures on record, covering ¥41.2B ($266.0M) in total reported value, spanning 2022-01-11 to 2025-09-24.

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.

JACCS Co., Ltd. 8584

Company

株式会社ジャックスJACCS Co., Ltd.

Investors

Buys

Total Value

¥41.2B ($266.0M)

Avg Return

+13.90%

Last Filing

2025-09-24

JACCS Co., Ltd. (8584) has 4 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥41.2B ($266.0M) in reported transaction value. The earliest filing StockDrifts holds for JACCS Co., Ltd. is dated 2022-01-11; the most recent is 2025-09-24. Across these filings the average return since disclosure is +13.90%, 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
2025-09-24	BUY	unknown	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	corporate	17.6M	¥4,350	-15.5%	¥2.5B ($15.8M)
2025-09-24	BUY	unknown	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	188.3K	¥4,350	-	-
2025-09-24	BUY	unknown	三菱UFJニコス株式会社 Mitsubishi UFJ Nicos Co., Ltd.	strategic	88.9K	¥4,350	-	-
2025-09-24	SELL	unknown	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	356.3K	¥4,350	+15.5%	¥2.5B ($15.8M)
2025-09-22	BUY	block_purchase	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	corporate	17.0M	¥4,325	-15.0%	¥34.5B ($222.8M)
2025-09-22	SELL	block_purchase	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	920.8K	¥4,325	+15.0%	¥819M ($5.3M)
2025-09-22	SELL	block_purchase	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	187.9K	¥4,325	+15.0%	¥78M ($503K)
2025-09-22	SELL	block_purchase	三菱UFJニコス株式会社 Mitsubishi UFJ Nicos Co., Ltd.	strategic	88.9K	¥4,325	+15.0%	¥97M ($629K)
2024-07-23	BUY	unknown	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	activist	7.0M	¥4,835	-	-
2024-07-23	SELL	unknown	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	861.9K	¥4,835	+24.0%	¥984M ($6.3M)
2024-07-23	SELL	unknown	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	161.7K	¥4,835	+24.0%	¥34.8B ($224.8M)
2024-07-23	BUY	unknown	三菱UFJニコス株式会社 Mitsubishi UFJ Nicos Co., Ltd.	strategic	88.9K	¥4,835	-	-
2022-01-11	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	1.4M	¥3,070	+19.7%	¥4.2B ($27.4M)
2022-01-11	BUY	Market Buy	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	11.5K	¥3,070	+19.7%	¥2.7B ($17.5M)

Frequently asked questions

Who has been buying JACCS Co., Ltd. stock?: 6 distinct investors have filed 4 disclosed large-shareholding filings in JACCS Co., Ltd. (8584), most recently on 2025-09-24. 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 JACCS Co., Ltd. have?: JACCS Co., Ltd. has 4 buy-side and 6 sell-side disclosures on record, covering ¥41.2B ($266.0M) in total reported value, spanning 2022-01-11 to 2025-09-24.
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.