Who has been buying JMDC Inc. stock?

4 distinct investors have filed 4 disclosed large-shareholding filings in JMDC Inc. (4483), most recently on 2025-05-15. 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 JMDC Inc. have?

JMDC Inc. has 4 buy-side and 9 sell-side disclosures on record, covering ¥83.2B ($536.8M) in total reported value, spanning 2021-11-01 to 2025-05-15.

Where does StockDrifts get JMDC Inc. 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.

JMDC Inc. 4483

Company

株式会社JMDCJMDC Inc.

Investors

Buys

Total Value

¥83.2B ($536.8M)

Avg Return

-45.57%

Last Filing

2025-05-15

JMDC Inc. (4483) has 4 disclosed large-shareholding filings and 9 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥83.2B ($536.8M) in reported transaction value. The earliest filing StockDrifts holds for JMDC Inc. is dated 2021-11-01; the most recent is 2025-05-15. 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 -45.57%, 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
2025-05-15	SELL	unknown	ノーリツ鋼機株式会社 Noritsu Koki Co., Ltd.	strategic	3.1M	¥3,189	-10.7%	¥2.1B ($13.7M)
2025-04-04	SELL	unknown	ノーリツ鋼機株式会社 Noritsu Koki Co., Ltd.	strategic	3.8M	¥2,695.5	-31.0%	¥1.8B ($11.5M)
2023-10-17	SELL	unknown	ノーリツ鋼機株式会社 Noritsu Koki Co., Ltd.	strategic	4.3M	¥5,472	+35.5%	¥30.2B ($194.7M)
2023-10-16	BUY	block_purchase	オムロン株式会社 OMRON Corporation	strategic	35.5M	¥5,349	-34.0%	¥79.3B ($511.6M)
2022-10-05	SELL	Market Buy	ワサッチ・アドバイザーズ・インク Wasatch Advisors, Inc.	passive	2.5M	¥5,150	+31.5%	¥3.6B ($23.1M)
2022-09-14	SELL	negotiated	オムロン株式会社 OMRON Corporation	strategic	18.6M	¥5,660	+37.6%	¥1.3B ($8.6M)
2022-09-14	SELL	subscription	松島陽介 Yosuke Matsushima	activist	2.6M	¥5,660	+37.6%	¥3.3B ($21.1M)
2022-09-14	BUY	negotiated	オムロン株式会社 OMRON Corporation	strategic	18.6M	¥5,660	-37.6%	¥1.3B ($8.6M)
2022-09-12	SELL	unknown	ノーリツ鋼機株式会社 Noritsu Koki Co., Ltd.	strategic	8.9M	¥5,980	+41.0%	¥650M ($4.2M)
2022-08-18	SELL	Market Buy	ワサッチ・アドバイザーズ・インク Wasatch Advisors, Inc.	passive	2.8M	¥7,390	+52.2%	¥4.4B ($28.6M)
2022-03-03	BUY	Market Buy	ワサッチ・アドバイザーズ・インク Wasatch Advisors, Inc.	passive	3.4M	¥6,330	-44.2%	¥3.9B ($25.1M)
2022-03-01	SELL	unknown	ノーリツ鋼機株式会社 Noritsu Koki Co., Ltd.	strategic	8.9M	¥6,350	+44.4%	¥130.5B ($842.0M)
2022-03-01	BUY	acquisition	オムロン株式会社 OMRON Corporation	strategic	18.6M	¥6,350	-44.4%	¥118.4B ($763.8M)
2021-11-01	BUY	Market Buy	ワサッチ・アドバイザーズ・インク Wasatch Advisors, Inc.	passive	2.8M	¥8,740	-59.6%	¥24.6B ($158.7M)

Frequently asked questions

Who has been buying JMDC Inc. stock?: 4 distinct investors have filed 4 disclosed large-shareholding filings in JMDC Inc. (4483), most recently on 2025-05-15. 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 JMDC Inc. have?: JMDC Inc. has 4 buy-side and 9 sell-side disclosures on record, covering ¥83.2B ($536.8M) in total reported value, spanning 2021-11-01 to 2025-05-15.
Where does StockDrifts get JMDC Inc. 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 JMDC Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.