Who has been buying Shinpo Co., Ltd. stock?

3 distinct investors have filed 6 disclosed large-shareholding filings in Shinpo Co., Ltd. (5903), most recently on 2026-05-07. 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 Shinpo Co., Ltd. have?

Shinpo Co., Ltd. has 6 buy-side and 0 sell-side disclosures on record, covering ¥80M ($513K) in total reported value, spanning 2021-04-06 to 2026-05-07.

Where does StockDrifts get Shinpo 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.

Shinpo Co., Ltd. 5903

Company

シンポ株式会社Shinpo Co., Ltd.

Investors

Buys

Total Value

¥80M ($513K)

Avg Return

+5.18%

Last Filing

2026-05-07

Shinpo Co., Ltd. (5903) has 6 disclosed large-shareholding filings and 0 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥80M ($513K) in reported transaction value. The earliest filing StockDrifts holds for Shinpo Co., Ltd. is dated 2021-04-06; the most recent is 2026-05-07. 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 +5.18%, 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
2026-07-06	BUY	Market Buy	ヤマタケ総業株式会社 Yamatake Sogyo Co., Ltd.	activist	5.5M	¥1,684	+0.1%	¥446M ($2.9M)
2026-06-23	SELL	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	0	¥1,681	-0.2%	¥1.9B ($12.2M)
2026-06-22	SELL	unknown	山田清久	unknown	0	¥1,682	-0.2%	¥113M ($726K)
2026-06-22	BUY	Market Buy	ヤマタケ総業株式会社	other	5.2M	¥1,682	+0.2%	¥5.5B ($35.6M)
2026-06-19	BUY	unknown	山田清久	strategic	66.8K	¥1,682	+0.2%	¥112M ($724K)
2026-06-19	BUY	unknown	ヤマタケ総業有限会社	strategic	2.0M	¥1,682	+0.2%	¥3.3B ($21.2M)
2026-06-19	BUY	unknown	山田清久	strategic	66.8K	¥1,682	+0.2%	¥112M ($724K)
2026-06-19	BUY	unknown	ヤマタケ総業株式会社	activist	2.0M	¥1,682	+0.2%	¥3.3B ($21.2M)
2026-05-07	BUY	unknown	山田清久	strategic	66.8K	¥1,696	+0.1%	¥113M ($730K)
2026-05-07	BUY	unknown	ヤマタケ総業株式会社	activist	2.0M	¥1,696	+0.1%	¥3.3B ($21.4M)
2026-05-07	BUY	unknown	山田清久	strategic	66.8K	¥1,696	+0.1%	¥113M ($730K)
2026-05-07	BUY	unknown	ヤマタケ総業株式会社	strategic	2.0M	¥1,696	+0.1%	¥3.3B ($21.4M)
2026-05-07	BUY	unknown	山田清久	strategic	66.8K	¥1,696	+0.1%	¥113M ($730K)
2026-05-07	BUY	unknown	ヤマタケ総業株式会社	activist	2.0M	¥1,696	+0.1%	¥3.3B ($21.4M)
2026-05-07	BUY	unknown	ヤマタケ総業株式会社	strategic	2.0M	¥1,696	+0.1%	¥3.3B ($21.4M)
2026-05-07	BUY	unknown	山田清久	strategic	66.8K	¥1,696	+0.1%	¥113M ($730K)
2024-08-15	BUY	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	1.1M	¥1,258	-3.2%	¥80M ($513K)
2023-12-06	BUY	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	1.1M	¥1,202	+1.3%	¥74M ($476K)
2022-07-15	BUY	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	1.0M	¥1,065	+14.4%	¥66M ($426K)
2022-02-03	BUY	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	940.1K	¥1,186	+2.7%	¥74M ($479K)
2021-08-17	BUY	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	877.6K	¥1,232	-1.1%	¥78M ($503K)
2021-04-06	BUY	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	814.1K	¥1,041.195	+17.0%	¥66M ($425K)

Frequently asked questions

Who has been buying Shinpo Co., Ltd. stock?: 3 distinct investors have filed 6 disclosed large-shareholding filings in Shinpo Co., Ltd. (5903), most recently on 2026-05-07. 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 Shinpo Co., Ltd. have?: Shinpo Co., Ltd. has 6 buy-side and 0 sell-side disclosures on record, covering ¥80M ($513K) in total reported value, spanning 2021-04-06 to 2026-05-07.
Where does StockDrifts get Shinpo 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 Shinpo Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.