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Nova System Co.,Ltd. 5257

Company
ノバシステム株式会社Nova System Co.,Ltd.
Investors
2
Buys
4
Total Value
¥1.3B ($8.1M)
Avg Return
-0.54%
Last Filing
2025-05-16

Nova System Co.,Ltd. (5257) has 4 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 2 distinct investors. Together those filings cover ¥1.3B ($8.1M) in reported transaction value. The earliest filing StockDrifts holds for Nova System Co.,Ltd. is dated 2023-04-05; the most recent is 2025-05-16. Across these filings the average return since disclosure is -0.54%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2025-05-16SELLMarket Buy
芳山 政安
yoshiyama masayasu
activist1.7K¥2,700-7.3%¥86M ($552K)
2025-05-16BUYMarket Buy
株式会社シリウス
Sirius Co., Ltd.
activist472.0K¥2,700+7.3%¥540M ($3.5M)
2024-11-25SELLunknown
芳山 政安
yoshiyama masayasu
activist200.0K¥2,260-28.2%¥226M ($1.5M)
2024-11-25BUYunknown
株式会社シリウス
Sirius Co., Ltd.
activist272.0K¥2,260+28.2%¥226M ($1.5M)
2023-07-14SELLunknown
芳山 政安
yoshiyama masayasu
activist300.0K¥2,939+1.4%¥34M ($221K)
2023-07-14SELLunknown
株式会社シリウス
Sirius Co., Ltd.
activist172.0K¥2,939+1.4%¥20M ($128K)
2023-04-05BUYunknown
芳山 政安
yoshiyama masayasu
activist300.0K¥2,818+2.8%¥845M ($5.5M)
2023-04-05BUYunknown
株式会社シリウス
Sirius Co., Ltd.
activist172.0K¥2,818+2.8%¥485M ($3.1M)

Frequently asked questions

Who has been buying Nova System Co.,Ltd. stock?
2 distinct investors have filed 4 disclosed large-shareholding filings in Nova System Co.,Ltd. (5257), most recently on 2025-05-16. 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 Nova System Co.,Ltd. have?
Nova System Co.,Ltd. has 4 buy-side and 4 sell-side disclosures on record, covering ¥1.3B ($8.1M) in total reported value, spanning 2023-04-05 to 2025-05-16.
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.