StockDrifts LogoStockDrifts

Seibu Giken Co.,Ltd. 6223

Company
株式会社西部技研Seibu Giken Co.,Ltd.
Investors
3
Buys
4
Total Value
¥20.4B ($131.3M)
Avg Return
-12.64%
Last Filing
2024-12-05

Seibu Giken Co.,Ltd. (6223) has 4 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥20.4B ($131.3M) in reported transaction value. The earliest filing StockDrifts holds for Seibu Giken Co.,Ltd. is dated 2023-10-11; the most recent is 2024-12-05. 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 -12.64%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2024-12-05BUYunknown
株式会社グリーンフューチャー
Green Future Co., Ltd.
activist6.8M¥1,657+28.4%¥3.0B ($19.6M)
2024-12-05SELLunknown
隈 扶三郎
FUMIO KUMA
activist374.7K¥1,657-28.4%¥3.0B ($19.6M)
2023-11-06BUYunknown
株式会社グリーンフューチャー
Green Future Co., Ltd.
activist5.0M¥2,471-13.9%¥12.4B ($79.7M)
2023-11-06BUYunknown
株式会社グリーンフューチャー
Green Future Co., Ltd.
activist5.0M¥2,471-13.9%¥12.4B ($79.7M)
2023-11-06SELLunknown
隈 扶三郎
FUMIO KUMA
activist2.2M¥2,471+13.9%¥2.0B ($12.6M)
2023-11-06SELLunknown
隈 扶三郎
FUMIO KUMA
activist2.2M¥2,471+13.9%¥2.0B ($12.6M)
2023-10-11BUYunknown
隈 扶三郎
FUMIO KUMA
activist3.0M¥2,886-26.3%¥8.7B ($55.9M)
2023-10-11BUYunknown
株式会社グリーンフューチャー
Green Future Co., Ltd.
activist5.0M¥2,886-26.3%¥14.4B ($93.1M)
2023-10-11BUYunknown
公益財団法人隈科学技術・文化振興会
Kuma Science Engineering and Culture Promotional Foundation
strategic3.0M¥2,886-26.3%¥8.7B ($55.9M)
2023-10-11BUYunknown
公益財団法人隈科学技術・文化振興会
Kuma Science Engineering and Culture Promotional Foundation
strategic3.0M¥2,886-26.3%¥8.7B ($55.9M)

Frequently asked questions

Who has been buying Seibu Giken Co.,Ltd. stock?
3 distinct investors have filed 4 disclosed large-shareholding filings in Seibu Giken Co.,Ltd. (6223), most recently on 2024-12-05. 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 Seibu Giken Co.,Ltd. have?
Seibu Giken Co.,Ltd. has 4 buy-side and 3 sell-side disclosures on record, covering ¥20.4B ($131.3M) in total reported value, spanning 2023-10-11 to 2024-12-05.
Where does StockDrifts get Seibu Giken 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 Seibu Giken Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.