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

4 distinct investors have filed 4 disclosed large-shareholding filings in Seigakusha Co.,Ltd. (2179), most recently on 2024-07-19. 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 Seigakusha Co.,Ltd. have?

Seigakusha Co.,Ltd. has 4 buy-side and 4 sell-side disclosures on record, covering ¥1.5B ($9.5M) in total reported value, spanning 2021-09-14 to 2024-07-19.

Where does StockDrifts get Seigakusha 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.

Seigakusha Co.,Ltd. 2179

Company

株式会社成学社Seigakusha Co.,Ltd.

Investors

Buys

Total Value

¥1.5B ($9.5M)

Avg Return

-4.55%

Last Filing

2024-07-19

Seigakusha Co.,Ltd. (2179) has 4 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥1.5B ($9.5M) in reported transaction value. The earliest filing StockDrifts holds for Seigakusha Co.,Ltd. is dated 2021-09-14; the most recent is 2024-07-19. 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 -4.55%, 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
2024-07-19	BUY	unknown	株式会社オーシャス Orious Co., Ltd.	activist	1.2M	¥807	-5.1%	¥682M ($4.4M)
2024-07-19	BUY	unknown	太田明弘 Ota Akihiro	activist	1.5M	¥807	-5.1%	¥1.2B ($7.7M)
2024-07-19	SELL	unknown	株式会社ニューウェーブ New Wave Co., Ltd.	unknown	0	¥807	+5.1%	¥683M ($4.4M)
2024-07-19	BUY	unknown	太田貴美子 Kimiko Ota	activist	174.0K	¥807	-5.1%	¥140M ($906K)
2024-07-08	BUY	unknown	株式会社ニューウェーブ New Wave Co., Ltd.	activist	1.2M	¥816	-6.1%	¥960M ($6.2M)
2024-07-08	BUY	unknown	太田貴美子 Kimiko Ota	activist	174.0K	¥816	-6.1%	¥142M ($916K)
2024-07-08	BUY	unknown	太田明弘 Ota Akihiro	activist	1.5M	¥816	-6.1%	¥1.2B ($7.7M)
2022-03-16	BUY	unknown	株式会社オーシャス Orious Co., Ltd.	activist	330.0K	¥788	-2.8%	¥260M ($1.7M)
2022-03-16	BUY	unknown	株式会社ニューウェーブ New Wave Co., Ltd.	activist	846.0K	¥788	-2.8%	¥667M ($4.3M)
2022-03-16	BUY	unknown	太田貴美子 Kimiko Ota	activist	174.0K	¥788	-2.8%	¥137M ($885K)
2022-03-16	BUY	unknown	太田明弘 Ota Akihiro	activist	1.5M	¥788	-2.8%	¥1.2B ($7.5M)
2022-03-16	BUY	unknown	株式会社オーシャス Orious Co., Ltd.	activist	330.0K	¥788	-2.8%	¥260M ($1.7M)
2022-03-16	BUY	unknown	株式会社ニューウェーブ New Wave Co., Ltd.	activist	846.0K	¥788	-2.8%	¥667M ($4.3M)
2022-03-16	BUY	unknown	太田貴美子 Kimiko Ota	activist	174.0K	¥788	-2.8%	¥137M ($885K)
2022-03-16	BUY	unknown	太田明弘 Ota Akihiro	activist	1.5M	¥788	-2.8%	¥1.2B ($7.5M)
2022-03-01	BUY	unknown	株式会社オーシャス Orious Co., Ltd.	activist	330.0K	¥787	-2.7%	¥260M ($1.7M)
2022-03-01	BUY	unknown	株式会社ニューウェーブ New Wave Co., Ltd.	activist	846.0K	¥787	-2.7%	¥666M ($4.3M)
2022-03-01	BUY	unknown	太田貴美子 Kimiko Ota	activist	174.0K	¥787	-2.7%	¥137M ($883K)
2022-03-01	BUY	unknown	株式会社オーシャス Orious Co., Ltd.	activist	330.0K	¥787	-2.7%	¥260M ($1.7M)
2022-03-01	BUY	unknown	株式会社ニューウェーブ New Wave Co., Ltd.	activist	846.0K	¥787	-2.7%	¥666M ($4.3M)
2022-03-01	BUY	unknown	太田貴美子 Kimiko Ota	activist	174.0K	¥787	-2.7%	¥137M ($883K)
2022-03-01	BUY	unknown	太田明弘 Ota Akihiro	activist	1.5M	¥787	-2.7%	¥1.2B ($7.5M)
2022-03-01	BUY	unknown	太田明弘 Ota Akihiro	activist	1.5M	¥787	-2.7%	¥1.2B ($7.5M)
2021-10-05	BUY	unknown	株式会社オーシャス Orious Co., Ltd.	activist	330.0K	¥775	-1.2%	¥256M ($1.6M)
2021-10-05	BUY	unknown	株式会社ニューウェーブ New Wave Co., Ltd.	activist	846.0K	¥775	-1.2%	¥656M ($4.2M)
2021-10-05	BUY	unknown	太田貴美子 Kimiko Ota	activist	174.0K	¥775	-1.2%	¥135M ($870K)
2021-10-05	BUY	unknown	株式会社オーシャス Orious Co., Ltd.	activist	330.0K	¥775	-1.2%	¥256M ($1.6M)
2021-10-05	BUY	unknown	株式会社ニューウェーブ New Wave Co., Ltd.	activist	846.0K	¥775	-1.2%	¥656M ($4.2M)
2021-10-05	BUY	unknown	太田貴美子 Kimiko Ota	activist	174.0K	¥775	-1.2%	¥135M ($870K)
2021-10-05	BUY	unknown	株式会社オーシャス Orious Co., Ltd.	activist	330.0K	¥775	-1.2%	¥256M ($1.6M)
2021-10-05	BUY	unknown	株式会社ニューウェーブ New Wave Co., Ltd.	activist	846.0K	¥775	-1.2%	¥656M ($4.2M)
2021-10-05	BUY	unknown	太田貴美子 Kimiko Ota	activist	174.0K	¥775	-1.2%	¥135M ($870K)
2021-10-05	BUY	unknown	太田明弘 Ota Akihiro	activist	1.5M	¥775	-1.2%	¥1.1B ($7.4M)
2021-10-05	BUY	unknown	太田明弘 Ota Akihiro	activist	1.5M	¥775	-1.2%	¥1.1B ($7.4M)
2021-10-05	BUY	unknown	太田明弘 Ota Akihiro	activist	1.5M	¥775	-1.2%	¥1.1B ($7.4M)
2021-09-14	BUY	unknown	株式会社オーシャス Orious Co., Ltd.	activist	330.0K	¥801	-4.4%	¥265M ($1.7M)
2021-09-14	SELL	unknown	株式会社ニューウェーブ New Wave Co., Ltd.	activist	846.0K	¥801	+4.4%	¥264M ($1.7M)
2021-09-14	BUY	unknown	太田貴美子 Kimiko Ota	activist	174.0K	¥801	-4.4%	¥139M ($899K)
2021-09-14	BUY	unknown	株式会社オーシャス Orious Co., Ltd.	activist	330.0K	¥801	-4.4%	¥265M ($1.7M)
2021-09-14	SELL	unknown	株式会社ニューウェーブ New Wave Co., Ltd.	activist	846.0K	¥801	+4.4%	¥264M ($1.7M)
2021-09-14	BUY	unknown	太田貴美子 Kimiko Ota	activist	174.0K	¥801	-4.4%	¥139M ($899K)
2021-09-14	BUY	unknown	株式会社オーシャス Orious Co., Ltd.	activist	330.0K	¥801	-4.4%	¥265M ($1.7M)
2021-09-14	SELL	unknown	株式会社ニューウェーブ New Wave Co., Ltd.	activist	846.0K	¥801	+4.4%	¥264M ($1.7M)
2021-09-14	BUY	unknown	太田貴美子 Kimiko Ota	activist	174.0K	¥801	-4.4%	¥139M ($899K)
2021-09-14	BUY	unknown	太田明弘 Ota Akihiro	activist	1.5M	¥801	-4.4%	¥1.2B ($7.6M)
2021-09-14	BUY	unknown	太田明弘 Ota Akihiro	activist	1.5M	¥801	-4.4%	¥1.2B ($7.6M)
2021-09-14	BUY	unknown	太田明弘 Ota Akihiro	activist	1.5M	¥801	-4.4%	¥1.2B ($7.6M)

Frequently asked questions

Who has been buying Seigakusha Co.,Ltd. stock?: 4 distinct investors have filed 4 disclosed large-shareholding filings in Seigakusha Co.,Ltd. (2179), most recently on 2024-07-19. 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 Seigakusha Co.,Ltd. have?: Seigakusha Co.,Ltd. has 4 buy-side and 4 sell-side disclosures on record, covering ¥1.5B ($9.5M) in total reported value, spanning 2021-09-14 to 2024-07-19.
Where does StockDrifts get Seigakusha 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 Seigakusha Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.