Who has been buying Japan Business Systems, Inc. stock?

6 distinct investors have filed 14 disclosed large-shareholding filings in Japan Business Systems, Inc. (5036), most recently on 2025-09-02. 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 Japan Business Systems, Inc. have?

Japan Business Systems, Inc. has 14 buy-side and 4 sell-side disclosures on record, covering ¥34.9B ($225.4M) in total reported value, spanning 2022-08-02 to 2025-09-02.

Where does StockDrifts get Japan Business Systems, Inc. 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.

Japan Business Systems, Inc. 5036

Company

日本ビジネスシステムズ株式会社Japan Business Systems, Inc.

Investors

Buys

Total Value

¥34.9B ($225.4M)

Avg Return

+15.17%

Last Filing

2025-09-02

Japan Business Systems, Inc. (5036) has 14 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥34.9B ($225.4M) in reported transaction value. The earliest filing StockDrifts holds for Japan Business Systems, Inc. is dated 2022-08-02; the most recent is 2025-09-02. 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 +15.17%, 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
2026-05-20	SELL	unknown	三菱総研DCS株式会社	unknown	0	¥1,851	+18.6%	¥492M ($3.2M)
2026-05-20	BUY	Market Buy	株式会社三菱総合研究所	strategic	7.3M	¥1,851	-18.6%	¥483M ($3.1M)
2025-09-02	BUY	Market Buy	株式会社ロマネ Romanee Co., Ltd.	activist	19.5M	¥1,525	-3.1%	¥29.7B ($191.5M)
2025-09-02	BUY	Market Buy	牧田京子 Kyoko Makita	activist	70.0K	¥1,525	-3.1%	¥107M ($689K)
2025-09-02	BUY	Market Buy	牧田幸弘 Makita Yukihiro	activist	1.4M	¥1,525	-3.1%	¥2.2B ($14.2M)
2025-08-29	SELL	unknown	三菱総研DCS株式会社 Mitsubishi Research Institute DCS Co., Ltd.	strategic	264.0K	¥1,564	+5.5%	¥2.7B ($17.1M)
2025-08-29	BUY	unknown	株式会社三菱総合研究所 Mitsubishi Research Institute,Inc.	strategic	7.0M	¥1,564	-5.5%	¥11.0B ($70.7M)
2025-06-03	BUY	unknown	三菱総研DCS株式会社 Mitsubishi Research Institute DCS Co., Ltd.	strategic	2.0M	¥1,446	+2.2%	¥2.8B ($18.3M)
2025-06-03	BUY	unknown	株式会社三菱総合研究所 Mitsubishi Research Institute,Inc.	strategic	7.0M	¥1,446	+2.2%	¥10.1B ($65.4M)
2024-04-03	BUY	unknown	牧田京子 Kyoko Makita	activist	70.0K	¥1,353	+9.2%	¥95M ($611K)
2024-04-03	BUY	unknown	株式会社ロマネ Romanee Co., Ltd.	activist	19.5M	¥1,353	+9.2%	¥26.3B ($169.9M)
2024-04-03	BUY	unknown	牧田幸弘 Makita Yukihiro	activist	1.4M	¥1,353	+9.2%	¥1.9B ($12.6M)
2023-09-29	BUY	unknown	牧田幸弘 Makita Yukihiro	activist	1.4M	¥1,204	+22.8%	¥1.7B ($11.2M)
2023-09-29	BUY	unknown	株式会社ロマネ Romanee Co., Ltd.	activist	19.5M	¥1,204	+22.8%	¥23.4B ($151.2M)
2023-09-29	BUY	unknown	牧田京子 Kyoko Makita	activist	70.0K	¥1,204	+22.8%	¥84M ($544K)
2023-07-18	BUY	unknown	牧田幸弘 Makita Yukihiro	activist	1.4M	¥1,502	-1.6%	¥2.2B ($14.0M)
2023-07-18	BUY	unknown	株式会社ロマネ Romanee Co., Ltd.	activist	19.5M	¥1,502	-1.6%	¥29.2B ($188.6M)
2023-07-18	BUY	unknown	牧田京子 Kyoko Makita	activist	70.0K	¥1,502	-1.6%	¥105M ($678K)
2023-07-18	BUY	unknown	株式会社ロマネ Romanee Co., Ltd.	activist	19.5M	¥1,502	-1.6%	¥29.2B ($188.6M)
2023-07-18	BUY	unknown	牧田京子 Kyoko Makita	activist	70.0K	¥1,502	-1.6%	¥105M ($678K)
2023-07-18	BUY	unknown	牧田幸弘 Makita Yukihiro	activist	1.4M	¥1,502	-1.6%	¥2.2B ($14.0M)
2023-05-16	BUY	unknown	株式会社ロマネ Romanee Co., Ltd.	activist	19.5M	¥1,286	+14.9%	¥2.9B ($18.7M)
2023-05-16	BUY	unknown	牧田京子 Kyoko Makita	activist	70.0K	¥1,286	+14.9%	¥90M ($581K)
2023-05-16	BUY	unknown	株式会社ロマネ Romanee Co., Ltd.	activist	19.5M	¥1,286	+14.9%	¥2.9B ($18.7M)
2023-05-16	BUY	unknown	牧田京子 Kyoko Makita	activist	70.0K	¥1,286	+14.9%	¥90M ($581K)
2023-05-16	SELL	unknown	牧田幸弘 Makita Yukihiro	activist	1.4M	¥1,286	-14.9%	¥2.9B ($18.7M)
2023-05-16	SELL	unknown	牧田幸弘 Makita Yukihiro	activist	1.4M	¥1,286	-14.9%	¥2.9B ($18.7M)
2023-02-09	SELL	subscription	長井一浩 Nagai Kazuhiro	activist	1.3M	¥1,770	+16.5%	¥788M ($5.1M)
2022-08-09	BUY	unknown	株式会社ロマネ Romanee Co., Ltd.	activist	8.6M	¥1,352	+9.3%	¥11.6B ($75.0M)
2022-08-09	BUY	unknown	牧田京子 Kyoko Makita	activist	35.0K	¥1,352	+9.3%	¥47M ($305K)
2022-08-09	BUY	unknown	株式会社ロマネ Romanee Co., Ltd.	activist	8.6M	¥1,352	+9.3%	¥11.6B ($75.0M)
2022-08-09	BUY	unknown	牧田京子 Kyoko Makita	activist	35.0K	¥1,352	+9.3%	¥47M ($305K)
2022-08-09	BUY	unknown	株式会社ロマネ Romanee Co., Ltd.	activist	8.6M	¥1,352	+9.3%	¥11.6B ($75.0M)
2022-08-09	BUY	unknown	牧田京子 Kyoko Makita	activist	35.0K	¥1,352	+9.3%	¥47M ($305K)
2022-08-09	BUY	subscription	長井一浩 Nagai Kazuhiro	activist	1.8M	¥1,352	+9.3%	¥2.4B ($15.3M)
2022-08-09	BUY	unknown	牧田幸弘 Makita Yukihiro	activist	1.9M	¥1,352	+9.3%	¥2.5B ($16.1M)
2022-08-09	BUY	unknown	牧田幸弘 Makita Yukihiro	activist	1.9M	¥1,352	+9.3%	¥2.5B ($16.1M)
2022-08-09	BUY	unknown	牧田幸弘 Makita Yukihiro	activist	1.9M	¥1,352	+9.3%	¥2.5B ($16.1M)
2022-08-02	BUY	unknown	三菱総研DCS株式会社 Mitsubishi Research Institute DCS Co., Ltd.	strategic	982.0K	¥1,021.5	+44.7%	¥1.0B ($6.5M)
2022-08-02	BUY	unknown	株式会社三菱総合研究所 Mitsubishi Research Institute,Inc.	strategic	3.5M	¥1,021.5	+44.7%	¥3.6B ($23.1M)

Frequently asked questions

Who has been buying Japan Business Systems, Inc. stock?: 6 distinct investors have filed 14 disclosed large-shareholding filings in Japan Business Systems, Inc. (5036), most recently on 2025-09-02. 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 Japan Business Systems, Inc. have?: Japan Business Systems, Inc. has 14 buy-side and 4 sell-side disclosures on record, covering ¥34.9B ($225.4M) in total reported value, spanning 2022-08-02 to 2025-09-02.
Where does StockDrifts get Japan Business Systems, Inc. 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 Japan Business Systems, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.