Who has been buying SOFT99corporation stock?

8 distinct investors have filed 9 disclosed large-shareholding filings in SOFT99corporation (4464), most recently on 2026-05-07. 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 SOFT99corporation have?

SOFT99corporation has 9 buy-side and 4 sell-side disclosures on record, covering ¥27.7B ($179.0M) in total reported value, spanning 2021-03-23 to 2026-05-07.

Where does StockDrifts get SOFT99corporation 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.

SOFT99corporation 4464

Company

株式会社ソフト99コーポレーションSOFT99corporation

Investors

Buys

Total Value

¥27.7B ($179.0M)

Avg Return

+48.04%

Last Filing

2026-05-07

SOFT99corporation (4464) has 9 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥27.7B ($179.0M) in reported transaction value. The earliest filing StockDrifts holds for SOFT99corporation is dated 2021-03-23; the most recent is 2026-05-07. 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 +48.04%, 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
2026-05-07	BUY	unknown	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	11.8M	¥3,665	-4.8%	¥43.4B ($279.9M)
2026-03-12	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	11.8M	¥3,885	-5.3%	¥15.7B ($101.1M)
2025-11-25	SELL	negotiated	KeePer技研株式会社代表取締役会長兼CEO 谷好通 KeePer Technical Laboratory Co., Ltd.	strategic	0	¥4,000	+8.0%	¥10.8B ($69.4M)
2025-11-21	BUY	unknown	サントレード株式会社 SUN TRADE CO.,LTD	other	3.2M	¥4,000	-8.0%	¥13.0B ($83.8M)
2025-11-21	BUY	unknown	鈴木幹子 MIKIKO SUZUKI	other	1.5M	¥4,000	-8.0%	¥6.0B ($38.5M)
2025-11-19	BUY	acquisition	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	activist	7.8M	¥4,005	-8.1%	¥31.3B ($201.7M)
2025-10-20	SELL	negotiated	三菱UFJ eスマート証券株式会社 Mitsubishi UFJ eSmart Securities Co., Ltd.	unknown	0	¥3,255	-13.1%	¥1.3B ($8.2M)
2025-10-20	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	strategic	144.0K	¥3,255	+13.1%	¥469M ($3.0M)
2025-10-20	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	799.2K	¥3,255	+13.1%	¥2.6B ($16.8M)
2025-09-30	BUY	negotiated	三菱UFJ eスマート証券株式会社 Mitsubishi UFJ eSmart Securities Co., Ltd.	other	392.8K	¥3,470	+6.0%	¥1.4B ($8.8M)
2025-09-30	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	strategic	144.0K	¥3,470	+6.0%	¥500M ($3.2M)
2025-09-30	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	799.2K	¥3,470	+6.0%	¥2.8B ($17.9M)
2025-09-17	BUY	negotiated	KeePer技研株式会社 KeePer Technical Laboratory Co., Ltd.	strategic	2.7M	¥3,465	+6.2%	¥9.3B ($60.1M)
2025-08-12	BUY	unknown	鈴木幹子 MIKIKO SUZUKI	other	1.5M	¥2,500	+47.2%	¥3.7B ($24.1M)
2025-08-12	SELL	unknown	サントレード株式会社 SUN TRADE CO.,LTD	other	3.2M	¥2,500	-47.2%	¥273M ($1.8M)
2025-08-12	BUY	unknown	鈴木幹子 MIKIKO SUZUKI	other	746.3K	¥2,500	+47.2%	¥1.9B ($12.0M)
2025-08-12	BUY	unknown	サントレード株式会社 SUN TRADE CO.,LTD	other	1.7M	¥2,500	+47.2%	¥4.2B ($27.1M)
2025-03-17	SELL	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	0	¥1,720	-114.0%	¥4.8B ($31.0M)
2025-03-14	BUY	unknown	KeePer技研株式会社 KeePer Technical Laboratory Co., Ltd.	other	2.7M	¥1,615	+127.9%	¥4.3B ($28.0M)
2021-03-23	BUY	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	2.8M	¥1,205.327	+205.3%	¥311M ($2.0M)

Frequently asked questions

Who has been buying SOFT99corporation stock?: 8 distinct investors have filed 9 disclosed large-shareholding filings in SOFT99corporation (4464), most recently on 2026-05-07. 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 SOFT99corporation have?: SOFT99corporation has 9 buy-side and 4 sell-side disclosures on record, covering ¥27.7B ($179.0M) in total reported value, spanning 2021-03-23 to 2026-05-07.
Where does StockDrifts get SOFT99corporation 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 SOFT99corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.