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MK Seiko Co., Ltd. 5906

Company
エムケー精工株式会社MK Seiko Co., Ltd.
Investors
6
Buys
4
Total Value
¥293M ($1.9M)
Avg Return
+127.97%
Last Filing
2025-05-26

MK Seiko Co., Ltd. (5906) has 4 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥293M ($1.9M) in reported transaction value. The earliest filing StockDrifts holds for MK Seiko Co., Ltd. is dated 2021-05-18; the most recent is 2025-05-26. 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 +127.97%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2025-05-26BUYnegotiated
八十二リース株式会社
Eighty Two Lease Co., Ltd.
strategic5.8K¥469+89.8%¥3M ($18K)
2025-05-26SELLnegotiated
株式会社長野銀行
Nagano Bank, Ltd.
strategic0¥469-89.8%¥99M ($637K)
2025-05-26SELLnegotiated
株式会社八十二銀行
The Hachijuni Bank, Ltd.
strategic688.0K¥469-89.8%¥15M ($99K)
2025-04-04BUYunknown
丸山 はる代
Haruyo Maruyama
strategic825.8K¥433+105.5%¥291M ($1.9M)
2025-04-04SELLunknown
丸山 永樹(相続人代表 丸山 はる代)
Eiki Maruyama (Heir Representative Haruyo Maruyama)
unknown0¥433-105.5%¥588M ($3.8M)
2023-06-08BUYnegotiated
八十二リース株式会社
Eighty Two Lease Co., Ltd.
strategic5.8K¥378+135.4%¥2M ($14K)
2023-06-08BUYnegotiated
株式会社長野銀行
Nagano Bank, Ltd.
strategic210.0K¥378+135.4%¥79M ($512K)
2023-06-08BUYnegotiated
株式会社八十二銀行
The Hachijuni Bank, Ltd.
strategic721.0K¥378+135.4%¥273M ($1.8M)
2021-05-18SELLMarket Buy
東京中小企業投資育成株式会社
TOKYO SMALL AND MEDIUM BUSINESS INVESTMENT & CONSULTATION CO.,LTD
passive1.2M¥422-110.9%¥47M ($301K)

Frequently asked questions

Who has been buying MK Seiko Co., Ltd. stock?
6 distinct investors have filed 4 disclosed large-shareholding filings in MK Seiko Co., Ltd. (5906), most recently on 2025-05-26. 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 MK Seiko Co., Ltd. have?
MK Seiko Co., Ltd. has 4 buy-side and 4 sell-side disclosures on record, covering ¥293M ($1.9M) in total reported value, spanning 2021-05-18 to 2025-05-26.
Where does StockDrifts get MK Seiko 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 MK Seiko Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.