Who has been buying CTS Co., Ltd. stock?

11 distinct investors have filed 17 disclosed large-shareholding filings in CTS Co., Ltd. (4345), most recently on 2025-12-04. 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 CTS Co., Ltd. have?

CTS Co., Ltd. has 17 buy-side and 6 sell-side disclosures on record, covering ¥20.7B ($133.3M) in total reported value, spanning 2021-07-26 to 2025-12-04.

Where does StockDrifts get CTS 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.

CTS Co., Ltd. 4345

Company

株式会社シーティーエスCTS Co., Ltd.

Investors

Buys

Total Value

¥20.7B ($133.3M)

Avg Return

+9.21%

Last Filing

2025-12-04

CTS Co., Ltd. (4345) has 17 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥20.7B ($133.3M) in reported transaction value. The earliest filing StockDrifts holds for CTS Co., Ltd. is dated 2021-07-26; the most recent is 2025-12-04. 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 +9.21%, 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
2026-08-07	BUY	unknown	エフエムアールインベストメントマネジメントユーケーリミテッドLimited) FMR Investment Management (UK	other	189.8K	¥821	+3.0%	¥156M ($1.0M)
2026-08-07	BUY	unknown	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	63.2K	¥821	+3.0%	¥52M ($335K)
2026-08-07	BUY	Market Buy	エフアイエーエムエルエルシー FIAM LLC	other	1.6M	¥821	+3.0%	¥431M ($2.8M)
2026-08-07	SELL	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	929.4K	¥821	-3.0%	¥321M ($2.1M)
2026-06-05	BUY	unknown	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	60.2K	¥814	+3.4%	¥49M ($316K)
2026-06-05	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	927.5K	¥814	+3.4%	¥755M ($4.9M)
2026-06-05	BUY	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	559.3K	¥814	+3.4%	¥455M ($2.9M)
2026-06-05	BUY	Market Buy	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	63.2K	¥814	+3.4%	¥3M ($22K)
2026-06-05	BUY	Market Buy	エフアイエーエムエルエルシー FIAM LLC	other	1.1M	¥814	+3.4%	¥113M ($728K)
2026-06-05	BUY	Market Buy	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	1.3M	¥814	+3.4%	¥619M ($4.0M)
2026-06-05	BUY	unknown	エフエムアールインベストメントマネジメントユーケーリミテッドLimited) FMR Investment Management (UK	other	720.0K	¥814	+3.4%	¥586M ($3.8M)
2025-12-04	BUY	Market Buy	横島泰蔵	activist	100.0K	¥907	-0.6%	¥90M ($582K)
2025-12-04	BUY	Market Buy	有限会社横島	strategic	16.4M	¥907	-0.6%	¥14.8B ($95.7M)
2025-12-04	BUY	Market Buy	横島泰蔵	activist	100.0K	¥907	+0.6%	¥90M ($582K)
2025-12-04	BUY	Market Buy	有限会社横島	strategic	16.0M	¥907	-0.6%	¥14.4B ($93.2M)
2025-07-23	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	2.3M	¥837	+7.8%	¥1.9B ($12.2M)
2025-06-30	SELL	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.5M	¥806	-11.9%	¥511M ($3.3M)
2025-06-30	BUY	Market Buy	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	11.3K	¥806	+11.9%	¥955M ($6.2M)
2025-06-30	BUY	Market Buy	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	354.0K	¥806	+11.9%	¥17M ($109K)
2024-09-02	BUY	Market Buy	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	74.4K	¥839	+7.5%	¥25M ($159K)
2024-09-02	BUY	Market Buy	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	332.9K	¥839	+7.5%	¥60M ($386K)
2024-09-02	BUY	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	2.2M	¥839	+7.5%	¥268M ($1.7M)
2023-09-07	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	640.0K	¥707	+27.6%	¥452M ($2.9M)
2023-09-07	SELL	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.3M	¥707	-27.6%	¥350M ($2.3M)
2022-11-22	SELL	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.8M	¥847	-6.5%	¥401M ($2.6M)
2022-11-22	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	640.0K	¥847	+6.5%	¥542M ($3.5M)
2022-03-23	SELL	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	151.3K	¥838	-7.6%	¥18M ($117K)
2022-03-23	BUY	Market Buy	レオス・キャピタルワークス株式会社 RHEOS CAPITAL WORKS Inc.	passive	1.6M	¥838	+7.6%	¥1.3B ($8.4M)
2022-01-11	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	2.2M	¥774	+16.5%	¥386M ($2.5M)
2022-01-11	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	640.0K	¥774	+16.5%	¥495M ($3.2M)
2022-01-07	BUY	Market Buy	エム・ユー投資顧問株式会社 M.U. Investment Advisors Co., Ltd.	passive	2.9K	¥759	+18.8%	¥273M ($1.8M)
2022-01-07	SELL	Market Buy	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	47.7K	¥759	-18.8%	¥43M ($276K)
2022-01-07	SELL	Market Buy	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	269.3K	¥759	-18.8%	¥283M ($1.8M)
2022-01-07	BUY	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.9M	¥759	+18.8%	¥412M ($2.7M)
2021-07-26	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	173.5K	¥816	+10.5%	¥142M ($913K)
2021-07-26	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	1.7M	¥816	+10.5%	¥1.4B ($9.2M)
2021-07-26	BUY	Market Buy	レオス・キャピタルワークス株式会社 RHEOS CAPITAL WORKS Inc.	passive	2.0M	¥816	+10.5%	¥1.6B ($10.6M)
2021-07-26	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	640.0K	¥816	+10.5%	¥522M ($3.4M)

Frequently asked questions

Who has been buying CTS Co., Ltd. stock?: 11 distinct investors have filed 17 disclosed large-shareholding filings in CTS Co., Ltd. (4345), most recently on 2025-12-04. 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 CTS Co., Ltd. have?: CTS Co., Ltd. has 17 buy-side and 6 sell-side disclosures on record, covering ¥20.7B ($133.3M) in total reported value, spanning 2021-07-26 to 2025-12-04.
Where does StockDrifts get CTS 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 CTS Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.