Who has been buying T&S inc. stock?

11 distinct investors have filed 8 disclosed large-shareholding filings in T&S inc. (4055), most recently on 2025-12-15. 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 T&S inc. have?

T&S inc. has 8 buy-side and 14 sell-side disclosures on record, covering ¥9.0B ($58.4M) in total reported value, spanning 2021-07-20 to 2025-12-15.

Where does StockDrifts get T&S 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.

T&S inc. 4055

Company

ティアンドエス株式会社T&S inc.

Investors

Buys

Total Value

¥9.0B ($58.4M)

Avg Return

-4.27%

Last Filing

2025-12-15

T&S inc. (4055) has 8 disclosed large-shareholding filings and 14 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥9.0B ($58.4M) in reported transaction value. The earliest filing StockDrifts holds for T&S inc. is dated 2021-07-20; the most recent is 2025-12-15. 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 -4.27%, 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
2026-05-29	BUY	unknown	合同会社TY&D	activist	190.9K	¥2,069	-10.9%	¥395M ($2.5M)
2026-05-29	BUY	unknown	合同会社RINGO	activist	190.9K	¥2,069	-10.9%	¥395M ($2.5M)
2026-05-29	BUY	unknown	合同会社尚創	activist	381.7K	¥2,069	-10.9%	¥790M ($5.1M)
2026-05-29	BUY	unknown	武川義浩	activist	1.9M	¥2,069	-10.9%	¥3.8B ($24.8M)
2026-05-15	BUY	unknown	渡辺貴美子	strategic	44.4K	¥2,055	-1.6%	¥91M ($589K)
2026-05-15	SELL	unknown	渡辺照男	strategic	446.4K	¥2,055	+1.6%	¥165M ($1.1M)
2026-05-15	SELL	unknown	渡辺照男	strategic	446.4K	¥2,055	+1.6%	¥165M ($1.1M)
2026-05-15	BUY	unknown	渡辺貴美子	strategic	44.4K	¥2,055	-1.6%	¥91M ($589K)
2025-12-15	BUY	unknown	合同会社TY&D	activist	190.9K	¥1,430	-18.3%	¥323M ($2.1M)
2025-12-15	BUY	unknown	合同会社RINGO	activist	190.9K	¥1,430	-18.3%	¥323M ($2.1M)
2025-12-15	BUY	unknown	武川義浩	activist	1.9M	¥1,430	-18.3%	¥3.1B ($20.3M)
2025-10-08	BUY	Market Buy	横浜キャピタル株式会社 Yokohama Capital	passive	1.1M	¥1,350	+25.3%	¥1.5B ($9.8M)
2025-10-08	BUY	Market Buy	横浜キャピタル株式会社 Yokohama Capital	passive	1.1M	¥1,350	+25.3%	¥1.5B ($9.8M)
2025-07-15	BUY	unknown	合同会社TY&D LLC TY&D	activist	190.9K	¥1,134	+49.1%	¥216M ($1.4M)
2025-07-15	BUY	unknown	合同会社RINGO RINGO LLC	activist	190.9K	¥1,134	+49.1%	¥216M ($1.4M)
2025-07-15	SELL	unknown	武川義浩 Yoshihiro Takekawa	activist	1.9M	¥1,134	-49.1%	¥433M ($2.8M)
2025-04-07	BUY	unknown	武川義浩 Yoshihiro Takekawa	activist	2.2M	¥861	+96.4%	¥1.9B ($12.5M)
2024-06-28	SELL	unknown	日下理 Satoshi Kusaka	strategic	562.8K	¥1,599	-5.8%	¥52M ($339K)
2023-05-30	SELL	unknown	日下藍子 Aiko Kusaka	strategic	0	¥2,691	+37.2%	¥31M ($199K)
2023-05-30	BUY	unknown	日下理 Satoshi Kusaka	strategic	595.2K	¥2,691	-37.2%	¥1.6B ($10.2M)
2023-05-30	SELL	unknown	遠藤玲 Akira Endo	strategic	294.8K	¥2,691	+37.2%	¥253M ($1.6M)
2023-04-27	BUY	unknown	渡辺貴美子 Kimiko Watanabe	strategic	44.4K	¥1,813	-6.7%	¥80M ($519K)
2023-04-27	BUY	unknown	武川義浩 Yoshihiro Takekawa	activist	2.2M	¥1,813	-6.7%	¥4.1B ($26.2M)
2023-04-27	BUY	unknown	渡辺照男 Teruo Watanabe	strategic	526.4K	¥1,813	-6.7%	¥944M ($6.1M)
2023-04-26	BUY	unknown	武川義浩 Yoshihiro Takekawa	activist	2.2M	¥1,820	-7.1%	¥4.1B ($26.3M)
2023-04-26	BUY	unknown	武川義浩 Yoshihiro Takekawa	activist	2.2M	¥1,820	-7.1%	¥4.1B ($26.3M)
2022-10-21	SELL	unknown	武川義浩 Yoshihiro Takekawa	activist	2.2M	¥1,208	-40.0%	¥461M ($3.0M)
2022-10-21	BUY	unknown	合同会社尚創 Syoso LLC	activist	381.7K	¥1,208	+40.0%	¥461M ($3.0M)
2022-04-27	BUY	unknown	武川義浩 Yoshihiro Takekawa	activist	2.6M	¥1,484	+13.9%	¥3.9B ($25.1M)
2022-04-18	SELL	unknown	日下藍子 Aiko Kusaka	strategic	31.2K	¥1,688	-0.2%	¥57M ($366K)
2022-04-18	BUY	unknown	日下理 Satoshi Kusaka	strategic	712.8K	¥1,688	+0.2%	¥1.2B ($7.7M)
2022-04-08	SELL	unknown	日下藍子 Aiko Kusaka	strategic	11.2K	¥2,050	+17.5%	¥41M ($262K)
2022-04-08	SELL	unknown	日下藍子 Aiko Kusaka	strategic	41.2K	¥2,050	+17.5%	¥49M ($313K)
2022-04-08	BUY	unknown	日下理 Satoshi Kusaka	strategic	662.8K	¥2,050	-17.5%	¥1.3B ($8.7M)
2022-04-08	BUY	unknown	日下理 Satoshi Kusaka	strategic	662.8K	¥2,050	-17.5%	¥1.3B ($8.7M)
2021-12-17	SELL	unknown	武川義浩 Yoshihiro Takekawa	activist	2.6M	¥1,450	-16.6%	¥350M ($2.3M)
2021-12-17	BUY	unknown	武川義浩 Yoshihiro Takekawa	activist	2.6M	¥1,450	+16.6%	¥350M ($2.3M)
2021-11-19	SELL	unknown	遠藤玲 Akira Endo	strategic	194.2K	¥2,045	+17.3%	¥61M ($393K)
2021-10-22	SELL	unknown	遠藤玲 Akira Endo	strategic	224.2K	¥1,912.5	+11.6%	¥80M ($518K)
2021-09-14	SELL	unknown	渡辺貴美子 Kimiko Watanabe	strategic	22.2K	¥2,132.5	+20.7%	¥55M ($357K)
2021-09-14	BUY	unknown	渡辺照男 Teruo Watanabe	strategic	313.2K	¥2,132.5	-20.7%	¥660M ($4.3M)
2021-08-30	SELL	unknown	日下寛之 Hiroyuki Kusaka	strategic	167.2K	¥2,190	+22.8%	¥77M ($495K)
2021-07-20	SELL	unknown	日下寛之 Hiroyuki Kusaka	strategic	202.2K	¥2,252.5	+24.9%	¥89M ($576K)

Frequently asked questions

Who has been buying T&S inc. stock?: 11 distinct investors have filed 8 disclosed large-shareholding filings in T&S inc. (4055), most recently on 2025-12-15. 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 T&S inc. have?: T&S inc. has 8 buy-side and 14 sell-side disclosures on record, covering ¥9.0B ($58.4M) in total reported value, spanning 2021-07-20 to 2025-12-15.
Where does StockDrifts get T&S 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 T&S inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.