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Japan System Techniques Co., Ltd. 4323

Company
日本システム技術株式会社Japan System Techniques Co., Ltd.
Investors
13
Buys
51
Total Value
¥2.2B ($14.1M)
Avg Return
+213.39%
Last Filing
2026-04-22

Japan System Techniques Co., Ltd. (4323) has 51 disclosed large-shareholding filings and 22 disclosed disposals on record, filed by 13 distinct investors. Together those filings cover ¥2.2B ($14.1M) in reported transaction value. The earliest filing StockDrifts holds for Japan System Techniques Co., Ltd. is dated 2021-03-29; the most recent is 2026-04-22. Across these filings the average return since disclosure is +213.39%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2026-04-22BUYMarket Buy
平林 武昭
activist485.9K¥1,964-3.5%¥200M ($1.3M)
2026-04-22BUYMarket Buy
平林 武昭
activist492.1K¥1,964-3.5%¥10M ($63K)
2026-04-22BUYMarket Buy
平林 武昭
activist492.1K¥1,964-3.5%¥10M ($63K)
2026-04-22BUYMarket Buy
平林 卓
strategic561.3K¥1,964-3.5%¥5M ($31K)
2026-04-22BUYunknown
平林 真実
strategic320¥1,964--
2026-04-22BUYunknown
株式会社ジャスト
strategic5.8M¥1,964--
2026-04-22BUYunknown
平林 恵美子
strategic60.0K¥1,964--
2026-04-22BUYunknown
平林 大
strategic240.7K¥1,964--
2026-04-22BUYMarket Buy
平林 武昭
activist485.9K¥1,964-3.5%¥200M ($1.3M)
2026-04-22BUYMarket Buy
平林 卓
strategic558.7K¥1,964-3.5%¥5M ($31K)
2026-04-22BUYunknown
平林 真実
strategic320¥1,964--
2026-04-22BUYunknown
株式会社ジャスト
strategic5.8M¥1,964--
2026-04-22BUYunknown
平林 恵美子
strategic60.0K¥1,964--
2026-04-22BUYMarket Buy
平林 大
strategic240.7K¥1,964-3.5%¥5M ($31K)
2026-04-22SELLnegotiated
平林 武昭
activist192.6K¥1,964+3.5%¥22M ($142K)
2026-04-22SELLunknown
平林 卓
strategic278.6K¥1,964+3.5%¥300M ($1.9M)
2026-04-22BUYunknown
平林 真実
strategic160¥1,964--
2026-04-22SELLunknown
株式会社ジャスト
strategic2.9M¥1,964+3.5%¥607M ($3.9M)
2026-04-22SELLunknown
平林 恵美子
strategic30.0K¥1,964+3.5%¥7M ($47K)
2026-04-22BUYMarket Buy
平林 大
strategic119.0K¥1,964-3.5%¥234M ($1.5M)
2026-04-22BUYMarket Buy
平林 卓
strategic561.3K¥1,964-3.5%¥5M ($31K)
2026-04-22BUYunknown
平林 真実
strategic320¥1,964--
2026-04-22BUYunknown
株式会社ジャスト
strategic5.8M¥1,964--
2026-04-22BUYunknown
平林 恵美子
strategic60.0K¥1,964--
2026-04-22BUYunknown
平林 大
strategic240.7K¥1,964--
2026-04-22BUYMarket Buy
平林 卓
strategic558.7K¥1,964-3.5%¥5M ($31K)
2026-04-22BUYMarket Buy
平林 大
strategic240.7K¥1,964-3.5%¥5M ($31K)
2026-04-22SELLunknown
平林 卓
strategic278.6K¥1,964+3.5%¥300M ($1.9M)
2026-04-22BUYunknown
平林 真実
strategic160¥1,964--
2026-04-22SELLunknown
株式会社ジャスト
strategic2.9M¥1,964+3.5%¥607M ($3.9M)
2026-04-22SELLunknown
平林 恵美子
strategic30.0K¥1,964+3.5%¥7M ($47K)
2026-04-22BUYMarket Buy
平林 大
strategic119.0K¥1,964-3.5%¥234M ($1.5M)
2026-04-22BUYunknown
平林 真実
strategic320¥1,964--
2026-04-22BUYunknown
株式会社ジャスト
strategic5.8M¥1,964--
2026-04-22BUYunknown
平林 恵美子
strategic60.0K¥1,964--
2026-04-22SELLnegotiated
平林 武昭
activist192.6K¥1,964+3.5%¥22M ($142K)
2026-02-12BUYMarket Buy
ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC)
MIRI Capital Management LLC
activist7.3M¥2,446-22.5%¥626M ($4.0M)
2025-12-18BUYMarket Buy
ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC)
MIRI Capital Management LLC
activist7.0M¥2,432-22.0%¥610M ($3.9M)
2025-09-25BUYMarket Buy
ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC)
MIRI Capital Management LLC
activist6.8M¥2,434-22.1%¥617M ($4.0M)
2024-12-02BUYMarket Buy
ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC)
MIRI Capital Management LLC
activist6.5M¥1,921-1.3%¥487M ($3.1M)
2024-09-26BUYMarket Buy
ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC)
MIRI Capital Management LLC
activist6.3M¥1,961-3.3%¥511M ($3.3M)
2024-01-12BUYMarket Buy
ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC)
MIRI Capital Management LLC
activist3.0M¥1,610+17.8%¥202M ($1.3M)
2023-08-30BUYMarket Buy
ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC)
MIRI Capital Management LLC
activist2.9M¥1,086+74.6%¥136M ($879K)
2023-04-18BUYMarket Buy
ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC)
MIRI Capital Management LLC
activist2.8M¥997.5+90.1%¥125M ($807K)
2023-01-24BUYMarket Buy
ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC)
MIRI Capital Management LLC
activist2.6M¥842+125.2%¥108M ($695K)
2022-12-28BUYMarket Buy
ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC)
MIRI Capital Management LLC
activist2.5M¥821+130.9%¥103M ($664K)
2022-12-05SELLunknown
ノムラ インターナショナル ピーエルシー
NOMURA INTERNATIONAL PLC
other-9.1K¥811-141.9%¥21M ($136K)
2022-12-05SELLunknown
野村證券株式会社
Nomura Securities Co.,Ltd.
other313.7K¥811-133.8%¥75M ($481K)
2022-12-05BUYunknown
野村アセットマネジメント株式会社
Nomura Asset Management Co., Ltd.
other246.6K¥811+133.8%¥12M ($78K)
2022-11-16BUYMarket Buy
ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC)
MIRI Capital Management LLC
activist2.4M¥841.5+125.3%¥109M ($701K)

Showing the 50 most recent of 113 filings.

Frequently asked questions

Who has been buying Japan System Techniques Co., Ltd. stock?
13 distinct investors have filed 51 disclosed large-shareholding filings in Japan System Techniques Co., Ltd. (4323), most recently on 2026-04-22. 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 Japan System Techniques Co., Ltd. have?
Japan System Techniques Co., Ltd. has 51 buy-side and 22 sell-side disclosures on record, covering ¥2.2B ($14.1M) in total reported value, spanning 2021-03-29 to 2026-04-22.
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.