Who has been buying Johnan Academic Preparatory Institute, Inc. stock?

6 distinct investors have filed 2 disclosed large-shareholding filings in Johnan Academic Preparatory Institute, Inc. (4720), most recently on 2026-03-23. 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 Johnan Academic Preparatory Institute, Inc. have?

Johnan Academic Preparatory Institute, Inc. has 2 buy-side and 13 sell-side disclosures on record, covering ¥159M ($1.0M) in total reported value, spanning 2021-12-07 to 2026-03-23.

Where does StockDrifts get Johnan Academic Preparatory Institute, 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.

Johnan Academic Preparatory Institute, Inc. 4720

Company

株式会社城南進学研究社Johnan Academic Preparatory Institute, Inc.

Investors

Buys

Total Value

¥159M ($1.0M)

Avg Return

-12.22%

Last Filing

2026-03-23

Johnan Academic Preparatory Institute, Inc. (4720) has 2 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥159M ($1.0M) in reported transaction value. The earliest filing StockDrifts holds for Johnan Academic Preparatory Institute, Inc. is dated 2021-12-07; the most recent is 2026-03-23. 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 -12.22%, 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
2026-03-23	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	538.6K	¥296	-14.2%	¥159M ($1.0M)
2026-03-16	BUY	negotiated	有限会社シモムラ	activist	2.7M	¥296	+14.2%	¥683M ($4.4M)
2026-03-16	BUY	negotiated	山崎杏里	strategic	379.0K	¥296	+14.2%	¥96M ($621K)
2026-03-16	BUY	negotiated	下村友里	strategic	379.0K	¥296	+14.2%	¥96M ($621K)
2026-03-16	SELL	negotiated	下村勝己	activist	582.6K	¥296	+14.2%	¥148M ($955K)
2026-03-11	BUY	negotiated	有限会社シモムラ	activist	2.7M	¥290	+12.4%	¥683M ($4.4M)
2026-03-11	BUY	negotiated	山崎杏里	strategic	379.0K	¥290	+12.4%	¥96M ($621K)
2026-03-11	BUY	negotiated	下村友里	strategic	379.0K	¥290	+12.4%	¥96M ($621K)
2026-03-11	SELL	negotiated	下村勝己	activist	588.6K	¥290	+12.4%	¥150M ($965K)
2026-03-06	SELL	negotiated	下村勝己	activist	594.6K	¥292	+13.0%	¥151M ($974K)
2026-03-06	BUY	negotiated	有限会社シモムラ	activist	2.7M	¥292	+13.0%	¥683M ($4.4M)
2026-03-06	BUY	negotiated	山崎杏里	strategic	379.0K	¥292	+13.0%	¥96M ($621K)
2026-03-06	BUY	negotiated	下村友里	strategic	379.0K	¥292	+13.0%	¥96M ($621K)
2026-03-06	BUY	negotiated	有限会社シモムラ	activist	2.7M	¥292	+13.0%	¥683M ($4.4M)
2026-03-06	BUY	negotiated	山崎杏里	strategic	379.0K	¥292	+13.0%	¥96M ($621K)
2026-03-06	BUY	negotiated	下村友里	strategic	379.0K	¥292	+13.0%	¥96M ($621K)
2026-03-06	SELL	negotiated	下村勝己	activist	594.6K	¥292	+13.0%	¥151M ($974K)
2026-02-06	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	433.2K	¥283	+10.3%	¥39M ($251K)
2026-02-05	SELL	negotiated	下村　勝己 KATSUMI SHIMOMURA	activist	4.1M	¥288	+11.8%	¥26M ($169K)
2026-01-23	BUY	negotiated	山崎杏里	strategic	379.0K	¥285	+10.9%	¥96M ($621K)
2026-01-23	BUY	negotiated	有限会社シモムラ	activist	2.7M	¥285	+10.9%	¥683M ($4.4M)
2026-01-23	BUY	negotiated	下村友里	strategic	379.0K	¥285	+10.9%	¥96M ($621K)
2026-01-23	SELL	negotiated	下村勝己	activist	773.8K	¥285	+10.9%	¥197M ($1.3M)
2026-01-23	BUY	negotiated	有限会社シモムラ	activist	2.7M	¥285	+10.9%	¥683M ($4.4M)
2026-01-23	BUY	negotiated	山崎杏里	strategic	379.0K	¥285	+10.9%	¥96M ($621K)
2026-01-23	BUY	negotiated	下村友里	strategic	379.0K	¥285	+10.9%	¥96M ($621K)
2026-01-23	SELL	negotiated	下村勝己	activist	701.8K	¥285	+10.9%	¥178M ($1.2M)
2026-01-09	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	571.0K	¥283	-10.3%	¥162M ($1.0M)
2025-12-26	BUY	negotiated	山崎杏里	strategic	379.0K	¥282	+9.9%	¥96M ($621K)
2025-12-26	BUY	negotiated	有限会社シモムラ	activist	2.7M	¥282	+9.9%	¥683M ($4.4M)
2025-12-26	BUY	negotiated	下村友里	strategic	379.0K	¥282	+9.9%	¥96M ($621K)
2025-12-26	SELL	negotiated	下村勝己	activist	882.0K	¥282	+9.9%	¥224M ($1.4M)
2025-12-26	BUY	negotiated	有限会社シモムラ	activist	2.7M	¥282	+9.9%	¥683M ($4.4M)
2025-12-26	BUY	negotiated	山崎杏里	strategic	379.0K	¥282	+9.9%	¥96M ($621K)
2025-12-26	BUY	negotiated	下村友里	strategic	379.0K	¥282	+9.9%	¥96M ($621K)
2025-12-26	SELL	negotiated	下村勝己	activist	882.0K	¥282	+9.9%	¥224M ($1.4M)
2025-12-16	BUY	negotiated	有限会社シモムラ	activist	2.7M	¥282	+9.9%	¥683M ($4.4M)
2025-12-16	BUY	negotiated	山崎杏里	strategic	379.0K	¥282	+9.9%	¥96M ($621K)
2025-12-16	BUY	negotiated	下村友里	strategic	379.0K	¥282	+9.9%	¥96M ($621K)
2025-12-16	BUY	negotiated	下村勝己	activist	977.0K	¥282	+9.9%	¥248M ($1.6M)
2025-11-10	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	280.0K	¥235	+8.1%	¥66M ($425K)
2025-11-10	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	97.6K	¥235	-8.1%	¥22M ($144K)
2023-03-07	BUY	negotiated	下村友里 Yuri Shimomura	strategic	379.0K	¥401	-36.7%	¥152M ($981K)
2023-03-07	BUY	negotiated	山崎杏里 Anri Yamazaki	strategic	379.0K	¥401	-36.7%	¥152M ($981K)
2023-03-07	BUY	negotiated	有限会社シモムラ Shimomura Ltd.	activist	2.7M	¥401	-36.7%	¥1.1B ($7.0M)
2023-03-07	BUY	negotiated	山崎杏里 Anri Yamazaki	strategic	379.0K	¥401	-36.7%	¥152M ($981K)
2023-03-07	BUY	negotiated	下村友里 Yuri Shimomura	strategic	379.0K	¥401	-36.7%	¥152M ($981K)
2023-03-07	BUY	negotiated	有限会社シモムラ Shimomura Ltd.	activist	2.7M	¥401	-36.7%	¥1.1B ($7.0M)
2023-03-07	BUY	negotiated	山崎杏里 Anri Yamazaki	strategic	379.0K	¥401	-36.7%	¥152M ($981K)
2023-03-07	BUY	negotiated	有限会社シモムラ Shimomura Ltd.	activist	2.7M	¥401	-36.7%	¥1.1B ($7.0M)

Showing the 50 most recent of 60 filings.

Frequently asked questions

Who has been buying Johnan Academic Preparatory Institute, Inc. stock?: 6 distinct investors have filed 2 disclosed large-shareholding filings in Johnan Academic Preparatory Institute, Inc. (4720), most recently on 2026-03-23. 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 Johnan Academic Preparatory Institute, Inc. have?: Johnan Academic Preparatory Institute, Inc. has 2 buy-side and 13 sell-side disclosures on record, covering ¥159M ($1.0M) in total reported value, spanning 2021-12-07 to 2026-03-23.
Where does StockDrifts get Johnan Academic Preparatory Institute, 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 Johnan Academic Preparatory Institute, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.