Who has been buying Sharingtechnology, Inc. stock?

10 distinct investors have filed 30 disclosed large-shareholding filings in Sharingtechnology, Inc. (3989), most recently on 2026-03-18. 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 Sharingtechnology, Inc. have?

Sharingtechnology, Inc. has 30 buy-side and 13 sell-side disclosures on record, covering ¥3.0B ($19.5M) in total reported value, spanning 2021-08-20 to 2026-03-18.

Where does StockDrifts get Sharingtechnology, 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.

Sharingtechnology, Inc. 3989

Company

シェアリングテクノロジー株式会社Sharingtechnology, Inc.

Investors

Buys

Total Value

¥3.0B ($19.5M)

Avg Return

+52.83%

Last Filing

2026-03-18

Sharingtechnology, Inc. (3989) has 30 disclosed large-shareholding filings and 13 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥3.0B ($19.5M) in reported transaction value. The earliest filing StockDrifts holds for Sharingtechnology, Inc. is dated 2021-08-20; the most recent is 2026-03-18. 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 +52.83%, 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
2026-03-18	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	6.9M	¥1,218	-4.3%	¥324M ($2.1M)
2026-03-04	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	6.6M	¥1,199	-2.8%	¥305M ($2.0M)
2026-02-19	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	6.4M	¥1,119	+4.2%	¥760M ($4.9M)
2026-02-18	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	5.7M	¥1,090	+7.0%	¥266M ($1.7M)
2026-02-04	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	5.4M	¥1,137	+2.5%	¥308M ($2.0M)
2026-01-05	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	5.2M	¥1,160	+0.5%	¥298M ($1.9M)
2025-12-22	SELL	Market Buy	株式会社ポートフォリア Portfolia Inc.	passive	1.2M	¥1,190	+2.0%	¥305M ($2.0M)
2025-12-16	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	4.9M	¥1,177	-0.9%	¥313M ($2.0M)
2025-12-04	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	4.6M	¥1,122	+3.9%	¥359M ($2.3M)
2025-11-11	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	4.3M	¥922	+26.5%	¥257M ($1.7M)
2025-09-24	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	4.0M	¥1,050	+11.1%	¥272M ($1.8M)
2025-09-22	SELL	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	1.1M	¥1,050	-11.1%	¥477M ($3.1M)
2025-09-10	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	3.8M	¥1,028	+13.4%	¥254M ($1.6M)
2025-08-22	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	3.5M	¥1,154	+1.0%	¥414M ($2.7M)
2025-05-09	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	191.0K	¥1,102	+5.8%	¥211M ($1.4M)
2025-05-09	BUY	Market Buy	SBIアセットマネジメント株式会社 SBI Asset Management Co., Ltd.	passive	1.0M	¥1,102	+5.8%	¥1.1B ($7.1M)
2025-02-06	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	3.0M	¥867	+34.5%	¥212M ($1.4M)
2025-01-27	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	2.8M	¥889	+31.2%	¥242M ($1.6M)
2025-01-16	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	2.5M	¥854	+36.5%	¥232M ($1.5M)
2024-12-20	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	2.2M	¥934	+24.8%	¥221M ($1.4M)
2024-12-16	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	2.0M	¥1,018	+14.5%	¥274M ($1.8M)
2024-12-11	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	1.7M	¥988	+18.0%	¥266M ($1.7M)
2024-12-09	SELL	Market Buy	綿引一 Watahiki Hajime	passive	1.1M	¥986	-18.3%	¥236M ($1.5M)
2024-12-06	BUY	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	1.4M	¥943	+23.6%	¥1.4B ($8.8M)
2024-12-02	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	1.5M	¥921	+26.6%	¥235M ($1.5M)
2024-11-29	SELL	Market Buy	綿引一 Watahiki Hajime	passive	1.4M	¥922	-26.5%	¥219M ($1.4M)
2024-11-29	BUY	Market Buy	綿引一 Watahiki Hajime	passive	1.4M	¥922	+26.5%	¥227M ($1.5M)
2024-10-15	SELL	Market Buy	綿引一 Watahiki Hajime	passive	1.6M	¥820	-42.2%	¥270M ($1.7M)
2024-10-15	BUY	Market Buy	綿引一 Watahiki Hajime	passive	1.6M	¥820	+42.2%	¥270M ($1.7M)
2024-09-24	SELL	Market Buy	株式会社ポートフォリア Portfolia Inc.	passive	1.4M	¥835	-39.6%	¥515M ($3.3M)
2024-08-21	BUY	Market Buy	アセット・バリュー・インベスターズ・リミテッド (Asset Value Investors Limited) Asset Value Investors Limited	activist	1.2M	¥686	+70.0%	¥827M ($5.3M)
2024-06-07	BUY	Market Buy	株式会社ポートフォリア Portfolia Inc.	passive	2.0M	¥563	+107.1%	¥181M ($1.2M)
2024-03-07	BUY	Market Buy	株式会社ポートフォリア Portfolia Inc.	passive	1.6M	¥495	+135.6%	¥812M ($5.2M)
2023-06-02	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	312.5K	¥648	+79.9%	¥194M ($1.2M)
2023-06-02	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	412.2K	¥648	+79.9%	¥261M ($1.7M)
2023-05-29	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.3M	¥570	+104.6%	¥761M ($4.9M)
2023-05-29	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	953.7K	¥570	+104.6%	¥544M ($3.5M)
2023-01-04	SELL	unknown	綿引一 Hajime Watahiki	strategic	1.8M	¥236	-394.1%	¥59M ($379K)
2023-01-04	SELL	unknown	綿引一 Hajime Watahiki	strategic	2.1M	¥236	-394.1%	¥143M ($924K)
2022-05-10	SELL	unknown	引字圭祐 KEISUKE HIKIJI	strategic	1.7M	¥124	-840.3%	¥185M ($1.2M)
2022-05-10	SELL	unknown	引字圭祐 KEISUKE HIKIJI	strategic	860.6K	¥124	-840.3%	¥44M ($286K)
2022-04-19	SELL	unknown	引字圭祐 KEISUKE HIKIJI	strategic	2.9M	¥136	-757.4%	¥31M ($197K)
2022-04-19	BUY	unknown	引字圭祐 KEISUKE HIKIJI	strategic	1.2M	¥136	+757.4%	¥30M ($195K)
2022-01-20	SELL	unknown	楽天証券株式会社 Rakuten Securities Inc	other	264.5K	¥91	-1181.3%	¥92M ($593K)
2021-11-08	BUY	unknown	楽天証券株式会社 Rakuten Securities Inc	other	1.3M	¥162	+619.8%	¥206M ($1.3M)
2021-08-20	SELL	unknown	引字圭祐 KEISUKE HIKIJI	strategic	3.1M	¥184	-533.7%	¥47M ($300K)
2021-08-20	BUY	unknown	引字圭祐 KEISUKE HIKIJI	strategic	1.4M	¥184	+533.7%	¥43M ($275K)

Frequently asked questions

Who has been buying Sharingtechnology, Inc. stock?: 10 distinct investors have filed 30 disclosed large-shareholding filings in Sharingtechnology, Inc. (3989), most recently on 2026-03-18. 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 Sharingtechnology, Inc. have?: Sharingtechnology, Inc. has 30 buy-side and 13 sell-side disclosures on record, covering ¥3.0B ($19.5M) in total reported value, spanning 2021-08-20 to 2026-03-18.
Where does StockDrifts get Sharingtechnology, 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 Sharingtechnology, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.