Who has been buying Tacmina Corporation stock?

4 distinct investors have filed 3 disclosed large-shareholding filings in Tacmina Corporation (6322), most recently on 2026-05-08. 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 Tacmina Corporation have?

Tacmina Corporation has 3 buy-side and 2 sell-side disclosures on record, covering ¥155M ($999K) in total reported value, spanning 2022-07-11 to 2026-05-08.

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.

Tacmina Corporation 6322

Company

株式会社タクミナTacmina Corporation

Investors

Buys

Total Value

¥155M ($999K)

Avg Return

+23.41%

Last Filing

2026-05-08

Tacmina Corporation (6322) has 3 disclosed large-shareholding filings and 2 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥155M ($999K) in reported transaction value. The earliest filing StockDrifts holds for Tacmina Corporation is dated 2022-07-11; the most recent is 2026-05-08. Across these filings the average return since disclosure is +23.41%, 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
2026-05-08	BUY	Market Buy	合同会社N.K.Freudel	strategic	540.0K	¥1,574	+1.8%	¥63M ($408K)
2026-05-08	BUY	Market Buy	合同会社N.K.Freudel	strategic	540.0K	¥1,574	+1.8%	¥63M ($408K)
2026-05-08	BUY	unknown	山田圭祐	strategic	134.5K	¥1,574	-	¥212M ($1.4M)
2026-05-08	BUY	unknown	山田圭祐	strategic	134.5K	¥1,574	-	¥212M ($1.4M)
2026-02-05	SELL	unknown	山田義彦 Yoshihiko Yamada	strategic	521.6K	¥1,575	-1.7%	¥125M ($809K)
2024-04-19	SELL	unknown	坪田康信 TSUBOTA YASUNOBU	other	1.0M	¥1,930	+17.0%	¥155M ($1.0M)
2024-04-19	BUY	unknown	坪田康信 TSUBOTA YASUNOBU	other	1.0M	¥1,930	-	¥155M ($1.0M)
2022-08-10	BUY	unknown	坪田康信 TSUBOTA YASUNOBU	other	906.0K	¥1,146	-	¥92M ($590K)
2022-08-10	BUY	Market Buy	坪田康信 TSUBOTA YASUNOBU	other	906.0K	¥1,146	+39.8%	¥92M ($590K)
2022-07-11	BUY	unknown	坪田康信 TSUBOTA YASUNOBU	other	906.0K	¥1,179	-	¥94M ($607K)
2022-07-11	BUY	unknown	坪田康信 TSUBOTA YASUNOBU	other	906.0K	¥1,179	-	¥94M ($607K)
2022-07-11	BUY	Market Buy	坪田康信 TSUBOTA YASUNOBU	other	906.0K	¥1,179	+35.9%	¥94M ($607K)

Frequently asked questions

Who has been buying Tacmina Corporation stock?: 4 distinct investors have filed 3 disclosed large-shareholding filings in Tacmina Corporation (6322), most recently on 2026-05-08. 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 Tacmina Corporation have?: Tacmina Corporation has 3 buy-side and 2 sell-side disclosures on record, covering ¥155M ($999K) in total reported value, spanning 2022-07-11 to 2026-05-08.
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.