Who has been buying Wakachiku Construction Co., Ltd. stock?

10 distinct investors have filed 38 disclosed large-shareholding filings in Wakachiku Construction Co., Ltd. (1888), most recently on 2026-03-19. 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 Wakachiku Construction Co., Ltd. have?

Wakachiku Construction Co., Ltd. has 38 buy-side and 8 sell-side disclosures on record, covering ¥5.4B ($34.7M) in total reported value, spanning 2021-06-30 to 2026-03-19.

Where does StockDrifts get Wakachiku Construction 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.

Wakachiku Construction Co., Ltd. 1888

Company

若築建設株式会社Wakachiku Construction Co., Ltd.

Investors

Buys

Total Value

¥5.4B ($34.7M)

Avg Return

+55.04%

Last Filing

2026-03-19

Wakachiku Construction Co., Ltd. (1888) has 38 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥5.4B ($34.7M) in reported transaction value. The earliest filing StockDrifts holds for Wakachiku Construction Co., Ltd. is dated 2021-06-30; the most recent is 2026-03-19. 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 +55.04%, 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
2026-07-07	BUY	Market Buy	株式会社麻生	activist	5.4M	¥3,360	+6.1%	¥18.2B ($117.6M)
2026-07-07	BUY	unknown	ACVEホールディングス合同会社	activist	1.1M	¥3,360	+6.1%	¥3.6B ($23.2M)
2026-03-19	BUY	negotiated	アモーヴァ・アセットマネジメント株式会社	other	84.7K	¥4,400	+13.0%	¥324M ($2.1M)
2026-03-19	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社	other	119.2K	¥4,400	+13.0%	¥457M ($2.9M)
2026-03-19	SELL	negotiated	三井住友信託銀行株式会社	strategic	110.3K	¥4,400	+13.0%	¥422M ($2.7M)
2026-03-18	BUY	Market Buy	ACVEホールディングス合同会社	activist	1.1M	¥4,550	+15.8%	¥4.1B ($26.5M)
2026-03-18	BUY	Market Buy	株式会社麻生	activist	5.4M	¥4,550	+15.8%	¥20.8B ($134.0M)
2026-02-19	BUY	Market Buy	株式会社麻生 Aso Corporation	activist	5.4M	¥4,890	-21.7%	¥577M ($3.7M)
2025-08-20	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	5.3M	¥5,840	-34.4%	¥787M ($5.1M)
2025-08-07	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	5.2M	¥6,090	-37.1%	¥837M ($5.4M)
2025-04-21	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	84.8K	¥3,970	+3.5%	¥62M ($398K)
2025-04-21	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	147.5K	¥3,970	+3.5%	¥453M ($2.9M)
2025-04-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	527.6K	¥3,970	-3.5%	¥2.1B ($13.5M)
2025-04-15	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	5.0M	¥3,785	+1.2%	¥515M ($3.3M)
2024-12-06	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	4.9M	¥3,745	+2.3%	¥486M ($3.1M)
2024-09-20	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	4.8M	¥3,430	+11.7%	¥449M ($2.9M)
2024-08-09	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	4.6M	¥3,425	+11.8%	¥448M ($2.9M)
2024-06-20	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	100.4K	¥3,470	+10.4%	¥13M ($87K)
2024-06-20	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	261.6K	¥3,470	-10.4%	¥468M ($3.0M)
2024-06-20	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	527.6K	¥3,470	+10.4%	¥1.8B ($11.8M)
2024-05-08	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	4.5M	¥3,325	+15.2%	¥448M ($2.9M)
2023-10-03	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	4.4M	¥2,912	+31.5%	¥385M ($2.5M)
2023-09-01	SELL	unknown	德永明彦 Tokunaga Akihiko	strategic	0	¥3,035	-26.2%	¥2.8B ($18.0M)
2023-09-01	BUY	unknown	上野世志史 Ueno Yoshihumi	strategic	988.0K	¥3,035	+26.2%	¥3.0B ($19.3M)
2023-05-10	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	4.2M	¥4,555	-15.9%	¥673M ($4.3M)
2023-04-13	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	4.1M	¥3,905	-1.9%	¥521M ($3.4M)
2023-03-23	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	4.0M	¥3,565	+7.4%	¥522M ($3.4M)
2023-03-03	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	3.8M	¥3,350	+14.3%	¥447M ($2.9M)
2023-01-12	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	3.7M	¥2,731	+40.2%	¥358M ($2.3M)
2022-11-30	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	3.5M	¥2,733	+40.1%	¥379M ($2.4M)
2022-11-04	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	3.4M	¥2,510	+52.6%	¥345M ($2.2M)
2022-09-29	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	3.3M	¥2,280	+68.0%	¥319M ($2.1M)
2022-07-25	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	3.1M	¥2,368	+61.7%	¥338M ($2.2M)
2022-07-06	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	3.0M	¥2,211	+73.2%	¥312M ($2.0M)
2022-06-16	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	2.8M	¥2,132	+79.6%	¥279M ($1.8M)
2022-05-30	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	2.7M	¥1,981	+93.3%	¥280M ($1.8M)
2022-05-10	SELL	unknown	宮内輝司 Miyauti Terushi	strategic	0	¥1,939	-97.5%	¥1.6B ($10.4M)
2022-05-10	BUY	unknown	德永明彦 Tokunaga Akihiko	strategic	921.6K	¥1,939	+97.5%	¥1.8B ($11.5M)
2022-04-06	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	2.6M	¥1,971	+94.3%	¥268M ($1.7M)
2021-11-12	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	2.4M	¥2,038	+87.9%	¥264M ($1.7M)
2021-10-15	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	2.3M	¥2,028	+88.9%	¥302M ($2.0M)
2021-09-15	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	2.2M	¥2,178	+75.8%	¥313M ($2.0M)
2021-09-08	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	2.0M	¥2,136	+79.3%	¥282M ($1.8M)
2021-09-06	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	1.9M	¥2,066	+85.4%	¥316M ($2.0M)
2021-09-01	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	1.7M	¥1,995	+92.0%	¥339M ($2.2M)
2021-08-24	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	1.6M	¥1,828	+109.5%	¥249M ($1.6M)
2021-08-20	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	315.0K	¥1,787	+114.3%	¥563M ($3.6M)
2021-08-20	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	171.0K	¥1,787	-114.3%	¥294M ($1.9M)
2021-08-18	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	1.4M	¥1,845	+107.6%	¥275M ($1.8M)
2021-08-10	BUY	Market Buy	株式会社麻生 ASO CORPORATION	strategic	1.3M	¥1,828	+109.5%	¥256M ($1.7M)

Showing the 50 most recent of 54 filings.

Frequently asked questions

Who has been buying Wakachiku Construction Co., Ltd. stock?: 10 distinct investors have filed 38 disclosed large-shareholding filings in Wakachiku Construction Co., Ltd. (1888), most recently on 2026-03-19. 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 Wakachiku Construction Co., Ltd. have?: Wakachiku Construction Co., Ltd. has 38 buy-side and 8 sell-side disclosures on record, covering ¥5.4B ($34.7M) in total reported value, spanning 2021-06-30 to 2026-03-19.
Where does StockDrifts get Wakachiku Construction 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 Wakachiku Construction Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.