Who has been buying Yamadai Corporation stock?

3 distinct investors have filed 3 disclosed large-shareholding filings in Yamadai Corporation (7426), most recently on 2026-05-15. 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 Yamadai Corporation have?

Yamadai Corporation has 3 buy-side and 1 sell-side disclosures on record, covering ¥490M ($3.2M) in total reported value, spanning 2024-03-04 to 2026-05-15.

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.

Yamadai Corporation 7426

Company

株式会社山大Yamadai Corporation

Investors

Buys

Total Value

¥490M ($3.2M)

Avg Return

-27.14%

Last Filing

2026-05-15

Yamadai Corporation (7426) has 3 disclosed large-shareholding filings and 1 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥490M ($3.2M) in reported transaction value. The earliest filing StockDrifts holds for Yamadai Corporation is dated 2024-03-04; the most recent is 2026-05-15. Across these filings the average return since disclosure is -27.14%, 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
2026-09-11	BUY	Market Buy	山本裕治 Yuji Yamamoto	passive	254.2K	¥599	-1.0%	¥7M ($46K)
2026-08-14	BUY	Market Buy	山本裕治 Yuji Yamamoto	passive	242.3K	¥625	-5.1%	¥24M ($157K)
2026-08-12	BUY	acquisition	有限会社エステートヤマダイン ESTATE YAMADAIN	strategic	0	¥603	-	¥179M ($1.2M)
2026-08-12	SELL	acquisition	有限会社エステートヤマダイン ESTATE YAMADAIN	strategic	0	¥603	+1.7%	¥179M ($1.2M)
2026-08-07	BUY	acquisition	ナイス株式会社 Nice Corporation	activist	703.8K	¥600	-1.2%	¥422M ($2.7M)
2026-08-06	BUY	Market Buy	山本裕治 Yuji Yamamoto	passive	203.4K	¥600	-1.2%	¥8M ($49K)
2026-08-05	SELL	unknown	高橋いち恵	unknown	0	¥602	+1.5%	¥8M ($50K)
2026-08-05	BUY	acquisition	有限会社エステートヤマダイン	strategic	297.2K	¥602	-	-
2026-07-23	BUY	Market Buy	山本裕治 Yuji Yamamoto	passive	190.8K	¥601	-1.3%	¥7M ($47K)
2026-07-13	BUY	Market Buy	山本裕治 Yuji Yamamoto	passive	178.6K	¥599	-1.0%	¥7M ($46K)
2026-07-02	BUY	Market Buy	山本裕治 Yuji Yamamoto	passive	166.7K	¥601	-1.3%	¥7M ($48K)
2026-06-25	BUY	Market Buy	山本裕治 Yuji Yamamoto	passive	154.2K	¥599	-1.0%	¥10M ($63K)
2026-06-22	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	33	¥599	+1.0%	¥68M ($437K)
2026-06-18	BUY	Market Buy	山本裕治 Yuji Yamamoto	passive	138.0K	¥599	-1.0%	¥11M ($69K)
2026-06-10	BUY	Market Buy	山本裕治 Yuji Yamamoto	passive	120.2K	¥601	-1.3%	¥11M ($69K)
2026-06-09	BUY	unknown	高橋いち恵	strategic	13.0K	¥603	-	-
2026-06-09	BUY	block_purchase	山本裕治 Yuji Yamamoto	passive	102.5K	¥603	-1.7%	¥11M ($70K)
2026-06-09	BUY	acquisition	有限会社エステートヤマダイン	strategic	297.2K	¥603	-	-
2026-06-09	BUY	unknown	有限会社エステートヤマダイン	strategic	297.2K	¥603	-	-
2026-06-09	BUY	unknown	有限会社エステートヤマダイン	strategic	1.5M	¥603	-	-
2026-06-09	BUY	acquisition	有限会社エステートヤマダイン	strategic	297.2K	¥603	-	-
2026-06-09	BUY	unknown	高橋いち恵	strategic	13.0K	¥603	-	-
2026-06-09	BUY	unknown	有限会社エステートヤマダイン	strategic	297.2K	¥603	-	-
2026-06-09	BUY	unknown	高橋いち恵	strategic	13.0K	¥603	-	-
2026-06-09	BUY	unknown	高橋いち恵	strategic	65.0K	¥603	-	-
2026-06-09	BUY	unknown	高橋いち恵	strategic	65.0K	¥603	-	-
2026-06-09	BUY	unknown	高橋いち恵	strategic	13.0K	¥603	-	-
2026-06-09	BUY	unknown	有限会社エステートヤマダイン	strategic	1.5M	¥603	-	-
2026-06-04	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	113.1K	¥604	-1.8%	¥9M ($57K)
2026-05-27	BUY	Market Buy	山本裕治 Yuji Yamamoto	passive	84.4K	¥507	+17.0%	¥6M ($41K)
2026-05-22	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	98.5K	¥519	+14.3%	¥12M ($78K)
2026-05-15	BUY	Market Buy	山本裕治 Yuji Yamamoto	passive	72.0K	¥497	+19.3%	¥6M ($38K)
2026-05-15	BUY	acquisition	山本裕治 Yuji Yamamoto	passive	60.1K	¥497	+19.3%	¥30M ($193K)
2026-05-12	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	75.2K	¥495	+19.8%	¥37M ($240K)
2024-03-12	BUY	unknown	塩満健一 shiomitsu kenichi	unknown	0	¥3,055	-	¥293M ($1.9M)
2024-03-12	SELL	Market Buy	塩満健一 shiomitsu kenichi	passive	0	¥3,055	+80.6%	¥293M ($1.9M)
2024-03-04	BUY	Market Buy	塩満健一 shiomitsu kenichi	passive	95.8K	¥4,405	-	¥422M ($2.7M)
2024-03-04	BUY	Market Buy	塩満健一 shiomitsu kenichi	passive	95.8K	¥4,405	-86.5%	¥422M ($2.7M)

Frequently asked questions

Who has been buying Yamadai Corporation stock?: 3 distinct investors have filed 3 disclosed large-shareholding filings in Yamadai Corporation (7426), most recently on 2026-05-15. 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 Yamadai Corporation have?: Yamadai Corporation has 3 buy-side and 1 sell-side disclosures on record, covering ¥490M ($3.2M) in total reported value, spanning 2024-03-04 to 2026-05-15.
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.