Who has been buying SEMITEC Corporation stock?

4 distinct investors have filed 8 disclosed large-shareholding filings in SEMITEC Corporation (6626), most recently on 2025-09-05. 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 SEMITEC Corporation have?

SEMITEC Corporation has 8 buy-side and 11 sell-side disclosures on record, covering ¥3.1B ($19.9M) in total reported value, spanning 2021-10-06 to 2025-09-05.

Where does StockDrifts get SEMITEC Corporation 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.

SEMITEC Corporation 6626

Company

SEMITEC株式会社SEMITEC Corporation

Investors

Buys

Total Value

¥3.1B ($19.9M)

Avg Return

+0.36%

Last Filing

2025-09-05

SEMITEC Corporation (6626) has 8 disclosed large-shareholding filings and 11 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥3.1B ($19.9M) in reported transaction value. The earliest filing StockDrifts holds for SEMITEC Corporation is dated 2021-10-06; the most recent is 2025-09-05. 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 +0.36%, 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
2025-09-05	SELL	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	549.7K	¥2,380	-1.7%	¥471M ($3.0M)
2025-07-07	SELL	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	747.1K	¥2,054	-17.9%	¥262M ($1.7M)
2025-02-07	SELL	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	874.3K	¥1,853	-30.6%	¥240M ($1.5M)
2024-05-09	SELL	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	1.0M	¥1,801	-34.4%	¥219M ($1.4M)
2024-02-20	BUY	unknown	石塚みどり Midori Ishizuka	strategic	339.0K	¥1,753	+38.1%	¥594M ($3.8M)
2024-02-20	SELL	unknown	石塚二朗 Ishizuka Jirou	strategic	632.3K	¥1,753	-38.1%	¥16M ($103K)
2024-02-01	SELL	unknown	石塚二朗 Ishizuka Jirou	strategic	641.0K	¥1,810	-33.8%	¥208M ($1.3M)
2024-02-01	BUY	unknown	石塚みどり Midori Ishizuka	strategic	339.0K	¥1,810	+33.8%	¥614M ($4.0M)
2023-11-15	BUY	unknown	石塚二朗 Ishizuka Jirou	strategic	756.1K	¥1,890	+28.1%	¥1.4B ($9.1M)
2023-11-15	SELL	unknown	石塚みどり Midori Ishizuka	strategic	339.0K	¥1,890	-28.1%	¥2M ($14K)
2023-11-15	SELL	unknown	石塚みどり Midori Ishizuka	strategic	339.0K	¥1,890	-28.1%	¥2M ($14K)
2023-11-15	BUY	unknown	石塚二朗 Ishizuka Jirou	strategic	756.1K	¥1,890	+28.1%	¥1.4B ($9.1M)
2022-05-19	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	131.2K	¥1,540	-57.2%	¥48M ($308K)
2022-04-06	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	162.2K	¥1,785	-35.6%	¥85M ($550K)
2022-02-04	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	210.1K	¥2,545	-4.9%	¥96M ($621K)
2022-01-07	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	172.4K	¥3,500	+30.8%	¥182M ($1.2M)
2021-12-22	BUY	Market Buy	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	281.5K	¥2,767.5	-12.5%	¥179M ($1.2M)
2021-12-06	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	224.3K	¥2,370	+2.1%	¥141M ($913K)
2021-11-22	BUY	Market Buy	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	216.9K	¥2,657.5	-8.9%	¥101M ($653K)
2021-10-22	BUY	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	178.8K	¥2,952.5	-18.0%	¥528M ($3.4M)
2021-10-06	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	164.7K	¥2,725	-11.2%	¥449M ($2.9M)

Frequently asked questions

Who has been buying SEMITEC Corporation stock?: 4 distinct investors have filed 8 disclosed large-shareholding filings in SEMITEC Corporation (6626), most recently on 2025-09-05. 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 SEMITEC Corporation have?: SEMITEC Corporation has 8 buy-side and 11 sell-side disclosures on record, covering ¥3.1B ($19.9M) in total reported value, spanning 2021-10-06 to 2025-09-05.
Where does StockDrifts get SEMITEC Corporation 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 SEMITEC Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.