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Sigmakoki Co., Ltd. 7713

Company
シグマ光機株式会社Sigmakoki Co., Ltd.
Investors
2
Buys
4
Total Value
¥235M ($1.5M)
Avg Return
+22.01%
Last Filing
2025-12-12

Sigmakoki Co., Ltd. (7713) has 4 disclosed large-shareholding filings and 0 disclosed disposals on record, filed by 2 distinct investors. Together those filings cover ¥235M ($1.5M) in reported transaction value. The earliest filing StockDrifts holds for Sigmakoki Co., Ltd. is dated 2024-05-08; the most recent is 2025-12-12. Across these filings the average return since disclosure is +22.01%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2025-12-12BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive476.6K¥1,511+63.9%¥114M ($736K)
2025-09-29BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive400.9K¥1,595+55.2%¥36M ($233K)
2025-09-04BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive378.5K¥1,463+69.2%¥554M ($3.6M)
2024-05-08BUYMarket Buy
シグマ光機取引先持株会 理事長 山之上 道廣
Michihiro Yamanoue
other455.6K¥1,607+54.1%¥121M ($783K)

Frequently asked questions

Who has been buying Sigmakoki Co., Ltd. stock?
2 distinct investors have filed 4 disclosed large-shareholding filings in Sigmakoki Co., Ltd. (7713), most recently on 2025-12-12. 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 Sigmakoki Co., Ltd. have?
Sigmakoki Co., Ltd. has 4 buy-side and 0 sell-side disclosures on record, covering ¥235M ($1.5M) in total reported value, spanning 2024-05-08 to 2025-12-12.
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.