Who has been buying Mimasu Semiconductor Industry Co., Ltd. stock?

11 distinct investors have filed 20 disclosed large-shareholding filings in Mimasu Semiconductor Industry Co., Ltd. (8155), most recently on 2024-08-22. 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 Mimasu Semiconductor Industry Co., Ltd. have?

Mimasu Semiconductor Industry Co., Ltd. has 20 buy-side and 14 sell-side disclosures on record, covering ¥81.6B ($526.3M) in total reported value, spanning 2021-11-04 to 2024-08-22.

Where does StockDrifts get Mimasu Semiconductor Industry 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.

Mimasu Semiconductor Industry Co., Ltd. 8155

Company

三益半導体工業株式会社Mimasu Semiconductor Industry Co., Ltd.

Investors

Buys

Total Value

¥81.6B ($526.3M)

Avg Return

+19.22%

Last Filing

2024-08-22

Mimasu Semiconductor Industry Co., Ltd. (8155) has 20 disclosed large-shareholding filings and 14 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥81.6B ($526.3M) in reported transaction value. The earliest filing StockDrifts holds for Mimasu Semiconductor Industry Co., Ltd. is dated 2021-11-04; the most recent is 2024-08-22. 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 +19.22%, 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
2024-08-22	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	562.0K	¥3,685	-0.1%	¥105M ($675K)
2024-08-22	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	130.9K	¥3,685	-0.1%	¥1.7B ($11.0M)
2024-08-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	260.8K	¥3,685	+0.1%	¥897M ($5.8M)
2024-08-22	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	6.0K	¥3,685	-0.1%	¥41M ($268K)
2024-08-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	78.5K	¥3,685	+0.1%	¥273M ($1.8M)
2024-08-09	SELL	acquisition	信越半導体株式会社 Shin-Etsu Semiconductor Co., Ltd.	unknown	0	¥3,675	-0.4%	¥1.3B ($8.5M)
2024-08-09	BUY	acquisition	信越化学工業株式会社 Shin-Etsu Chemical Co., Ltd.	activist	28.4M	¥3,675	+0.4%	¥53.9B ($347.4M)
2024-08-07	SELL	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	589.9K	¥3,685	-0.1%	¥13M ($84K)
2024-08-07	SELL	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	592.9K	¥3,685	-0.1%	¥392M ($2.5M)
2024-08-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	388.7K	¥3,685	+0.1%	¥1.4B ($9.2M)
2024-08-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	1.6M	¥3,685	+0.1%	¥5.8B ($37.4M)
2024-08-07	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.8M	¥3,685	+0.1%	¥13M ($84K)
2024-08-06	SELL	unknown	中澤正幸 Nakazawa Masayuki	unknown	0	¥3,680	-0.3%	¥7.2B ($46.8M)
2024-07-22	BUY	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	699.1K	¥3,700	-0.3%	¥2.2B ($14.0M)
2024-07-22	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.8M	¥3,700	-0.3%	¥1.6B ($10.3M)
2024-07-22	SELL	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	594.3K	¥3,700	+0.3%	¥79M ($508K)
2024-06-21	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.4M	¥3,690	+0.0%	¥2.2B ($14.4M)
2024-06-21	SELL	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	613.6K	¥3,690	+0.0%	¥26M ($169K)
2024-06-21	SELL	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	114.2K	¥3,690	+0.0%	¥1.6B ($10.2M)
2024-05-21	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	621.7K	¥3,710	-0.5%	¥2.3B ($14.9M)
2024-05-21	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	541.6K	¥3,710	-0.5%	¥2.0B ($13.0M)
2024-05-21	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	799.8K	¥3,710	-0.5%	¥3.0B ($19.1M)
2024-03-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.5M	¥3,195	-15.5%	¥1.2B ($7.8M)
2023-11-21	SELL	Market Buy	シュローダー・インベストメント・マネージメント・リミテッド Schroder Investment Management Limited	passive	40.8K	¥2,726	-35.4%	¥165M ($1.1M)
2023-11-21	BUY	Market Buy	シュローダー・インベストメント・マネジメント株式会社 Schroder Investment Management(Japan)Limited	passive	1.5M	¥2,726	+35.4%	¥4.1B ($26.5M)
2023-04-20	SELL	Market Buy	シュローダー・インベストメント・マネージメント・リミテッド Schroder Investment Management Limited	passive	98.6K	¥2,696	-36.9%	¥3.7B ($24.1M)
2023-04-20	BUY	Market Buy	シュローダー・インベストメント・マネジメント株式会社 Schroder Investment Management(Japan)Limited	passive	1.8M	¥2,696	+36.9%	¥3.2B ($20.4M)
2022-12-22	BUY	Market Buy	米国みずほ証券 Mizuho Securities USA LLC	unknown	0	¥2,427	+52.0%	-
2022-12-22	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	10.3K	¥2,427	+52.0%	¥2.4B ($15.7M)
2022-12-22	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.9M	¥2,427	+52.0%	¥60M ($389K)
2022-12-21	BUY	Market Buy	シュローダー・インベストメント・マネージメント・リミテッド Schroder Investment Management Limited	passive	1.5M	¥2,399	+53.8%	¥903M ($5.8M)
2022-12-21	SELL	Market Buy	シュローダー・インベストメント・マネジメント株式会社 Schroder Investment Management(Japan)Limited	passive	649.1K	¥2,399	-53.8%	¥119M ($769K)
2022-12-07	BUY	unknown	米国みずほ証券 Mizuho Securities USA LLC	other	0	¥2,567	+43.8%	-
2022-12-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.8M	¥2,567	+43.8%	¥4.7B ($30.1M)
2022-12-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	63.7K	¥2,567	+43.8%	¥164M ($1.1M)
2022-04-21	BUY	Market Buy	シュローダー・インベストメント・マネージメント・リミテッド Schroder Investment Management Limited	passive	1.1M	¥2,368	+55.8%	¥2.6B ($17.0M)
2022-04-21	BUY	Market Buy	シュローダー・インベストメント・マネジメント株式会社 Schroder Investment Management(Japan)Limited	passive	700.0K	¥2,368	+55.8%	¥1.7B ($10.7M)
2021-11-04	BUY	negotiated	信越半導体株式会社 Shin-Etsu Semiconductor Co., Ltd.	strategic	359.4K	¥2,487	+48.4%	¥894M ($5.8M)
2021-11-04	BUY	negotiated	信越化学工業株式会社 Shin-Etsu Chemical Co., Ltd.	strategic	13.7M	¥2,487	+48.4%	¥34.2B ($220.4M)

Frequently asked questions

Who has been buying Mimasu Semiconductor Industry Co., Ltd. stock?: 11 distinct investors have filed 20 disclosed large-shareholding filings in Mimasu Semiconductor Industry Co., Ltd. (8155), most recently on 2024-08-22. 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 Mimasu Semiconductor Industry Co., Ltd. have?: Mimasu Semiconductor Industry Co., Ltd. has 20 buy-side and 14 sell-side disclosures on record, covering ¥81.6B ($526.3M) in total reported value, spanning 2021-11-04 to 2024-08-22.
Where does StockDrifts get Mimasu Semiconductor Industry 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 Mimasu Semiconductor Industry Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.