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UMC Electronics Co., Ltd. 6615

Company
ユー・エム・シー・エレクトロニクス株式会社UMC Electronics Co., Ltd.
Investors
9
Buys
6
Total Value
¥11.2B ($72.1M)
Avg Return
-32.59%
Last Filing
2026-05-13

UMC Electronics Co., Ltd. (6615) has 6 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥11.2B ($72.1M) in reported transaction value. The earliest filing StockDrifts holds for UMC Electronics Co., Ltd. is dated 2021-03-30; the most recent is 2026-05-13. 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 -32.59%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2026-05-13BUYunknown
アセットマネジメントOne株式会社
other193.7K¥312-16.7%¥60M ($390K)
2026-05-13BUYunknown
みずほ信託銀行株式会社
other137.8K¥312-16.7%¥43M ($277K)
2026-05-13BUYunknown
株式会社みずほ銀行
strategic22.2M¥312-16.7%¥6.9B ($44.8M)
2021-04-08BUYunknown
株式会社アイシン
AISIN CORPORATION
other2.2M¥1,011-70.3%¥2.2B ($14.4M)
2021-03-31BUYMarket Buy
株式会社豊田自動織機
TOYOTA INDUSTRIES CORPORATION
strategic9.8M¥869.293-65.5%¥7.3B ($47.0M)
2021-03-31BUYunknown
アイシン精機株式会社
AISIN SEIKI CO., LTD.
other2.2M¥869.293-65.5%¥1.9B ($12.4M)
2021-03-31BUYunknown
株式会社ネクスティエレクトロニクス
NEXTY Electronics Corporation
other2.2M¥869.293-65.5%¥1.9B ($12.4M)
2021-03-31BUYunknown
アイシン精機株式会社
AISIN SEIKI CO., LTD.
other2.2M¥869.293-65.5%¥1.9B ($12.4M)
2021-03-30SELLprivate
S・ウチヤマ・ホールディングス有限会社
S-Uchiyama Holdings Ltd.
strategic721.1K¥921.413+67.4%¥2.7B ($17.1M)
2021-03-30SELLprivate
H・ウチヤマ・ホールディングス有限会社
H-Uchiyama Holdings Ltd.
strategic741.4K¥921.413+67.4%¥684M ($4.4M)
2021-03-30SELLprivate
O・ウチヤマ・ホールディングス有限会社
O-Uchiyama Holdings Ltd.
strategic626.8K¥921.413+67.4%¥578M ($3.7M)

Frequently asked questions

Who has been buying UMC Electronics Co., Ltd. stock?
9 distinct investors have filed 6 disclosed large-shareholding filings in UMC Electronics Co., Ltd. (6615), most recently on 2026-05-13. 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 UMC Electronics Co., Ltd. have?
UMC Electronics Co., Ltd. has 6 buy-side and 3 sell-side disclosures on record, covering ¥11.2B ($72.1M) in total reported value, spanning 2021-03-30 to 2026-05-13.
Where does StockDrifts get UMC Electronics 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 UMC Electronics Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.