Who has been buying Fonfun Corporation stock?

11 distinct investors have filed 16 disclosed large-shareholding filings in Fonfun Corporation (2323), most recently on 2026-03-27. 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 Fonfun Corporation have?

Fonfun Corporation has 16 buy-side and 31 sell-side disclosures on record, covering ¥704M ($4.5M) in total reported value, spanning 2021-10-29 to 2026-03-27.

Where does StockDrifts get Fonfun Corporation 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.

Fonfun Corporation 2323

Company

株式会社fonfunFonfun Corporation

Investors

Buys

Total Value

¥704M ($4.5M)

Avg Return

+242.58%

Last Filing

2026-03-27

Fonfun Corporation (2323) has 16 disclosed large-shareholding filings and 31 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥704M ($4.5M) in reported transaction value. The earliest filing StockDrifts holds for Fonfun Corporation is dated 2021-10-29; the most recent is 2026-03-27. 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 +242.58%, 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
2026-03-27	SELL	unknown	水口翼	unknown	1.5M	¥347	-3.2%	¥552M ($3.6M)
2026-03-27	SELL	unknown	サイブリッジグループ株式会社	activist	3.0M	¥347	-3.2%	¥1.1B ($6.9M)
2026-03-27	SELL	unknown	水口翼	unknown	1.5M	¥347	-3.2%	¥552M ($3.6M)
2026-03-27	SELL	unknown	サイブリッジグループ株式会社	activist	3.0M	¥347	-3.2%	¥1.1B ($6.9M)
2026-03-05	BUY	unknown	水口翼	unknown	257.0K	¥344	-4.1%	¥92M ($594K)
2026-03-05	BUY	unknown	サイブリッジ合同会社	activist	1.7M	¥344	-4.1%	¥601M ($3.9M)
2026-03-05	BUY	subscription	サイブリッジグループ株式会社	unknown	505.3K	¥344	+4.1%	¥181M ($1.2M)
2026-03-05	BUY	subscription	水口翼	other	257.0K	¥344	+4.1%	¥92M ($594K)
2026-03-05	BUY	unknown	水口翼	unknown	257.0K	¥344	-4.1%	¥92M ($594K)
2026-03-05	BUY	unknown	サイブリッジ合同会社	activist	1.7M	¥344	-4.1%	¥601M ($3.9M)
2026-03-05	BUY	subscription	サイブリッジグループ株式会社	unknown	505.3K	¥344	+4.1%	¥181M ($1.2M)
2026-03-05	BUY	subscription	水口翼	other	257.0K	¥344	+4.1%	¥92M ($594K)
2024-11-08	BUY	unknown	水口翼 Tsubasa Mizuguchi	unknown	257.0K	¥146.17	+144.9%	¥38M ($242K)
2024-11-08	BUY	unknown	水口翼 Tsubasa Mizuguchi	unknown	257.0K	¥146.17	+144.9%	¥38M ($242K)
2024-11-08	BUY	unknown	サイブリッジ合同会社 CYBRiDGE LLC.	activist	2.2M	¥146.17	+144.9%	¥319M ($2.1M)
2024-11-08	BUY	unknown	サイブリッジ合同会社 CYBRiDGE LLC	activist	1.7M	¥146.17	+144.9%	¥245M ($1.6M)
2024-11-08	BUY	unknown	サイブリッジ合同会社 CYBRiDGE LLC	activist	1.7M	¥146.17	+144.9%	¥245M ($1.6M)
2024-05-10	BUY	unknown	水口翼 Tsubasa Mizuguchi	unknown	257.0K	¥133.33	+168.5%	¥34M ($221K)
2024-05-10	BUY	unknown	水口翼 Tsubasa Mizuguchi	unknown	257.0K	¥133.33	+168.5%	¥34M ($221K)
2024-05-10	SELL	Market Buy	サイブリッジコーポレーション株式会社 CYBRiDGE CORPORATION.	activist	0	¥133.33	-168.5%	¥67M ($435K)
2024-05-10	BUY	unknown	水口翼 Tsubasa Mizuguchi	unknown	257.0K	¥133.33	+168.5%	¥34M ($221K)
2024-05-10	BUY	unknown	水口翼 Tsubasa Mizuguchi	unknown	257.0K	¥133.33	+168.5%	¥34M ($221K)
2024-05-10	BUY	unknown	サイブリッジ合同会社 CYBRiDGE LLC	activist	1.7M	¥133.33	+168.5%	¥224M ($1.4M)
2024-05-10	BUY	unknown	サイブリッジグループ株式会社 CYBRiDGE GROUP CORPORATION.	activist	505.3K	¥133.33	+168.5%	¥67M ($435K)
2024-05-10	BUY	unknown	サイブリッジ合同会社 CYBRiDGE LLC	activist	1.7M	¥133.33	+168.5%	¥224M ($1.4M)
2024-05-10	BUY	unknown	サイブリッジグループ株式会社 CYBRiDGE GROUP CORPORATION.	activist	505.3K	¥133.33	+168.5%	¥67M ($435K)
2024-05-10	BUY	unknown	サイブリッジグループ株式会社 CYBRiDGE GROUP CORPORATION.	activist	505.3K	¥133.33	+168.5%	¥67M ($435K)
2024-05-10	BUY	unknown	サイブリッジ合同会社 CYBRiDGE LLC	activist	1.7M	¥133.33	+168.5%	¥224M ($1.4M)
2024-05-10	BUY	unknown	サイブリッジ合同会社 CYBRiDGE LLC	activist	1.7M	¥133.33	+168.5%	¥224M ($1.4M)
2023-11-24	SELL	Market Buy	株式会社EGIJ EGIJ Co., Ltd.	passive	61.6K	¥122.33	-192.7%	¥579K ($4K)
2023-11-24	SELL	Market Buy	賀川志麻子 Shimako Kagawa	passive	15.0K	¥122.33	-192.7%	¥2M ($14K)
2023-11-24	SELL	Market Buy	株式会社EGIJ EGIJ Co., Ltd.	passive	61.6K	¥122.33	-192.7%	¥579K ($4K)
2023-11-24	SELL	Market Buy	株式会社EGIJ EGIJ Co., Ltd.	passive	61.6K	¥122.33	-192.7%	¥579K ($4K)
2023-11-24	SELL	Market Buy	賀川正宣 Kagawa Masanori	passive	108.9K	¥122.33	-192.7%	¥3M ($17K)
2023-11-24	SELL	Market Buy	賀川志麻子 Shimako Kagawa	passive	15.0K	¥122.33	-192.7%	¥2M ($14K)
2023-11-24	SELL	Market Buy	賀川志麻子 Shimako Kagawa	passive	15.0K	¥122.33	-192.7%	¥2M ($14K)
2023-11-24	SELL	Market Buy	株式会社EGIJ EGIJ Co., Ltd.	passive	61.6K	¥122.33	-192.7%	¥579K ($4K)
2023-11-24	SELL	Market Buy	賀川志麻子 Shimako Kagawa	passive	15.0K	¥122.33	-192.7%	¥2M ($14K)
2023-11-24	SELL	Market Buy	賀川正宣 Kagawa Masanori	passive	89.3K	¥122.33	-192.7%	¥5M ($32K)
2023-11-24	SELL	Market Buy	賀川正宣 Kagawa Masanori	passive	108.9K	¥122.33	-192.7%	¥3M ($17K)
2023-11-24	SELL	Market Buy	賀川正宣 Kagawa Masanori	passive	108.9K	¥122.33	-192.7%	¥3M ($17K)
2023-08-30	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	7.0K	¥86.83	+312.3%	¥172K ($1K)
2023-08-30	BUY	Market Buy	サイブリッジコーポレーション株式会社 CYBRiDGE CORPORATION.	activist	505.3K	¥86.83	+312.3%	¥44M ($283K)
2023-08-24	BUY	Market Buy	サイブリッジコーポレーション株式会社 CYBRiDGE CORPORATION.	activist	505.3K	¥88.83	+303.0%	¥45M ($290K)
2023-08-24	BUY	Market Buy	サイブリッジコーポレーション株式会社 CYBRiDGE CORPORATION.	activist	505.3K	¥88.83	+303.0%	¥45M ($290K)
2023-08-23	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	512.2K	¥83	+331.3%	¥43M ($274K)
2023-08-08	BUY	Market Buy	賀川志麻子 Shimako Kagawa	passive	32.3K	¥84.67	+322.8%	¥3M ($18K)
2023-08-08	SELL	Market Buy	株式会社EGIJ EGIJ Co., Ltd.	passive	66.2K	¥84.67	-322.8%	¥3M ($20K)
2023-08-08	SELL	Market Buy	株式会社EGIJ EGIJ Co., Ltd.	passive	66.2K	¥84.67	-322.8%	¥3M ($20K)
2023-08-08	SELL	Market Buy	株式会社NSKKホールディングス NSKK Holdings Co., Ltd.	unknown	0	¥84.67	-322.8%	¥10M ($66K)

Showing the 50 most recent of 76 filings.

Frequently asked questions

Who has been buying Fonfun Corporation stock?: 11 distinct investors have filed 16 disclosed large-shareholding filings in Fonfun Corporation (2323), most recently on 2026-03-27. 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 Fonfun Corporation have?: Fonfun Corporation has 16 buy-side and 31 sell-side disclosures on record, covering ¥704M ($4.5M) in total reported value, spanning 2021-10-29 to 2026-03-27.
Where does StockDrifts get Fonfun Corporation 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 Fonfun Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.