Who has been buying TSI Holdings Co.,Ltd. stock?

23 distinct investors have filed 38 disclosed large-shareholding filings in TSI Holdings Co.,Ltd. (3608), most recently on 2026-05-12. 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 TSI Holdings Co.,Ltd. have?

TSI Holdings Co.,Ltd. has 38 buy-side and 15 sell-side disclosures on record, covering ¥21.6B ($139.4M) in total reported value, spanning 2021-03-22 to 2026-05-12.

Where does StockDrifts get TSI Holdings Co.,Ltd. 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.

TSI Holdings Co.,Ltd. 3608

Company

株式会社TSIホールディングスTSI Holdings Co.,Ltd.

Investors

Buys

Total Value

¥21.6B ($139.4M)

Avg Return

+136.30%

Last Filing

2026-05-12

TSI Holdings Co.,Ltd. (3608) has 38 disclosed large-shareholding filings and 15 disclosed disposals on record, filed by 23 distinct investors. Together those filings cover ¥21.6B ($139.4M) in reported transaction value. The earliest filing StockDrifts holds for TSI Holdings Co.,Ltd. is dated 2021-03-22; the most recent is 2026-05-12. 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 +136.30%, 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
2026-06-05	BUY	unknown	株式会社三井住友銀行	other	2.2M	¥1,139	+3.4%	¥2.5B ($16.1M)
2026-06-05	BUY	Market Buy	三井住友DSアセットマネジメント株式会社	passive	95.3K	¥1,139	+3.4%	¥109M ($700K)
2026-06-05	SELL	unknown	株式会社SMBC信託銀行	other	135.9K	¥1,139	-3.4%	¥1.2B ($7.9M)
2026-05-12	BUY	Market Buy	三井住友DSアセットマネジメント株式会社	passive	97.2K	¥1,195	-4.7%	¥116M ($749K)
2026-05-12	BUY	unknown	株式会社三井住友銀行	other	2.2M	¥1,195	-4.7%	¥2.6B ($16.9M)
2026-05-12	BUY	unknown	株式会社SMBC信託銀行	other	1.2M	¥1,195	-4.7%	¥1.4B ($9.3M)
2026-04-03	BUY	Market Buy	アセットマネジメントOne株式会社	other	1.1M	¥1,098	+16.4%	¥174M ($1.1M)
2026-04-03	BUY	Market Buy	みずほ信託銀行株式会社	other	3.0M	¥1,098	+16.4%	¥2.9B ($18.9M)
2026-04-03	BUY	Market Buy	株式会社みずほ銀行	strategic	2.9M	¥1,098	+16.4%	¥174M ($1.1M)
2025-07-31	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	189.3K	¥1,059	+39.7%	¥12.5B ($80.8M)
2025-06-19	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	7.1M	¥1,103	+34.1%	¥850M ($5.5M)
2024-10-17	BUY	unknown	三宅淳子 Junko Miyake	other	120.0K	¥996	+48.5%	¥120M ($771K)
2024-10-17	SELL	unknown	株式会社テキスタイル Textile Co., Ltd.	strategic	523.2K	¥996	-48.5%	¥128M ($826K)
2024-10-17	SELL	unknown	有限会社三昭興産 Sansho Kosan Co., Ltd.	strategic	1.6M	¥996	-48.5%	¥128M ($826K)
2024-10-17	SELL	unknown	三宅孝彦 TAKAHIKO MIYAKE	other	1.5M	¥996	-48.5%	¥752M ($4.9M)
2024-08-13	BUY	unknown	三宅淳子 Junko Miyake	other	120.0K	¥824	+79.5%	¥99M ($638K)
2024-08-13	BUY	unknown	株式会社テキスタイル Textile Co., Ltd.	strategic	650.0K	¥824	+79.5%	¥536M ($3.5M)
2024-08-13	BUY	unknown	有限会社三昭興産 Sansho Kosan Co., Ltd.	strategic	1.7M	¥824	+79.5%	¥1.4B ($9.1M)
2024-08-13	BUY	unknown	株式会社テキスタイル Textile Co., Ltd.	strategic	650.0K	¥824	+79.5%	¥536M ($3.5M)
2024-08-13	BUY	unknown	有限会社三昭興産 Sansho Kosan Co., Ltd.	strategic	1.7M	¥824	+79.5%	¥1.4B ($9.1M)
2024-08-13	BUY	unknown	三宅孝彦 TAKAHIKO MIYAKE	other	2.3M	¥824	+79.5%	¥695M ($4.5M)
2024-08-13	SELL	unknown	三宅孝彦 TAKAHIKO MIYAKE	other	2.3M	¥824	-79.5%	¥695M ($4.5M)
2024-08-13	BUY	unknown	三宅淳子 Junko Miyake	other	120.0K	¥824	+79.5%	¥99M ($638K)
2024-07-23	BUY	unknown	株式会社テキスタイル Textile Co., Ltd.	strategic	650.0K	¥861	+71.8%	¥560M ($3.6M)
2024-07-23	BUY	unknown	有限会社三昭興産 Sansho Kosan Co., Ltd.	strategic	1.7M	¥861	+71.8%	¥1.5B ($9.6M)
2024-07-23	BUY	unknown	三宅孝彦 TAKAHIKO MIYAKE	other	3.1M	¥861	+71.8%	¥2.7B ($17.3M)
2024-07-23	BUY	unknown	三宅淳子 Junko Miyake	other	120.0K	¥861	+71.8%	¥103M ($667K)
2024-05-07	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	7.4M	¥916	+61.5%	¥814M ($5.2M)
2024-03-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.3M	¥647	-128.6%	¥6M ($36K)
2024-03-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	486.2K	¥647	+128.6%	¥315M ($2.0M)
2024-03-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	59.0K	¥647	-128.6%	¥400M ($2.6M)
2024-03-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	3.8M	¥647	+128.6%	¥2.5B ($15.9M)
2024-02-07	SELL	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.3M	¥680	-117.5%	¥219M ($1.4M)
2024-02-07	BUY	Market Buy	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	486.2K	¥680	+117.5%	¥41M ($267K)
2024-02-07	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	675.0K	¥680	+117.5%	¥459M ($3.0M)
2024-02-07	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	3.8M	¥680	+117.5%	¥53M ($344K)
2023-10-20	SELL	Market Buy	大和アセットマネジメント株式会社 Daiwa Asset Management Co.Ltd.	other	934.1K	¥767	-92.8%	¥28M ($178K)
2023-10-20	BUY	Market Buy	大和PIパートナーズ株式会社 Daiwa PI Partners Co. Ltd.	passive	1.3M	¥767	+92.8%	¥947M ($6.1M)
2023-08-28	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	6.8M	¥713	+107.4%	¥688M ($4.4M)
2023-07-20	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	5.8M	¥764	+93.6%	¥957M ($6.2M)
2023-05-10	SELL	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	109.7K	¥669	-121.1%	¥48M ($311K)
2023-05-10	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	3.4M	¥669	+121.1%	¥2.3B ($14.6M)
2023-03-01	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	¥613	+141.3%	¥2.8B ($18.1M)
2023-02-07	BUY	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	178.9K	¥560	+164.1%	¥100M ($646K)
2023-02-07	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	4.4M	¥560	+164.1%	¥2.5B ($15.8M)
2023-02-06	BUY	Market Buy	大和アセットマネジメント株式会社 Daiwa Asset Management Co.Ltd.	other	970.4K	¥535	+176.4%	¥519M ($3.3M)
2023-02-06	BUY	Market Buy	大和アセットマネジメント株式会社 Daiwa Asset Management Co.Ltd.	other	970.4K	¥535	+176.4%	¥519M ($3.3M)
2023-02-06	BUY	Market Buy	大和PIパートナーズ株式会社 Daiwa PI Partners Co. Ltd.	passive	3.7M	¥535	+176.4%	¥2.0B ($12.7M)
2023-02-06	BUY	Market Buy	大和PIパートナーズ株式会社 Daiwa PI Partners Co. Ltd.	passive	3.7M	¥535	+176.4%	¥2.0B ($12.7M)
2022-12-06	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	979.4K	¥469	+215.3%	¥9M ($58K)

Showing the 50 most recent of 67 filings.

Frequently asked questions

Who has been buying TSI Holdings Co.,Ltd. stock?: 23 distinct investors have filed 38 disclosed large-shareholding filings in TSI Holdings Co.,Ltd. (3608), most recently on 2026-05-12. 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 TSI Holdings Co.,Ltd. have?: TSI Holdings Co.,Ltd. has 38 buy-side and 15 sell-side disclosures on record, covering ¥21.6B ($139.4M) in total reported value, spanning 2021-03-22 to 2026-05-12.
Where does StockDrifts get TSI Holdings Co.,Ltd. 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 TSI Holdings Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.