Who has been buying TESEC Corporation stock?

5 distinct investors have filed 3 disclosed large-shareholding filings in TESEC Corporation (6337), most recently on 2026-01-22. 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 TESEC Corporation have?

TESEC Corporation has 3 buy-side and 4 sell-side disclosures on record, covering ¥1.3B ($8.5M) in total reported value, spanning 2023-06-16 to 2026-01-22.

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.

TESEC Corporation 6337

Company

株式会社テセックTESEC Corporation

Investors

Buys

Total Value

¥1.3B ($8.5M)

Avg Return

+19.51%

Last Filing

2026-01-22

TESEC Corporation (6337) has 3 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥1.3B ($8.5M) in reported transaction value. The earliest filing StockDrifts holds for TESEC Corporation is dated 2023-06-16; the most recent is 2026-01-22. Across these filings the average return since disclosure is +19.51%, 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
2026-06-19	SELL	unknown	田中綏子 Tanaka Yasuko	strategic	274.2K	¥2,604	-32.9%	¥163M ($1.0M)
2026-06-08	BUY	unknown	田中綏子 Tanaka Yasuko	strategic	336.9K	¥2,507	-	¥161M ($1.0M)
2026-06-08	SELL	unknown	田中綏子 Tanaka Yasuko	strategic	336.9K	¥2,507	-38.0%	¥161M ($1.0M)
2026-01-22	SELL	negotiated	みずほ証券株式会社	strategic	57.0K	¥2,456	-40.9%	¥319M ($2.1M)
2026-01-22	BUY	negotiated	みずほ信託銀行株式会社	other	150.0K	¥2,456	-	-
2025-11-21	BUY	negotiated	みずほ証券株式会社 Mizuho Securities Co., Ltd.	strategic	186.9K	¥1,978	+74.9%	¥370M ($2.4M)
2025-11-21	BUY	negotiated	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	150.0K	¥1,978	+74.9%	¥297M ($1.9M)
2023-09-22	SELL	unknown	大和アセットマネジメント株式会社 Daiwa Asset Management Co.Ltd.	other	245.2K	¥2,930	-18.1%	¥190M ($1.2M)
2023-09-12	SELL	unknown	村井昭 murai akira	strategic	276.6K	¥3,155	-9.7%	¥222M ($1.4M)
2023-08-04	BUY	unknown	大和アセットマネジメント株式会社 Daiwa Asset Management Co.Ltd.	other	310.0K	¥3,310	+4.5%	¥1.0B ($6.6M)
2023-06-16	BUY	unknown	田中綏子 TanakaYasuko	strategic	401.0K	¥2,604	-	¥214M ($1.4M)
2023-06-16	SELL	unknown	田中綏子 TanakaYasuko	strategic	401.0K	¥2,604	-32.9%	¥215M ($1.4M)

Frequently asked questions

Who has been buying TESEC Corporation stock?: 5 distinct investors have filed 3 disclosed large-shareholding filings in TESEC Corporation (6337), most recently on 2026-01-22. 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 TESEC Corporation have?: TESEC Corporation has 3 buy-side and 4 sell-side disclosures on record, covering ¥1.3B ($8.5M) in total reported value, spanning 2023-06-16 to 2026-01-22.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.