Who has been buying M3, Inc. stock?

17 distinct investors have filed 21 disclosed large-shareholding filings in M3, Inc. (2413), most recently on 2026-05-11. 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 M3, Inc. have?

M3, Inc. has 21 buy-side and 12 sell-side disclosures on record, covering ¥329.8B ($2.1B) in total reported value, spanning 2021-04-05 to 2026-05-11.

Where does StockDrifts get M3, 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.

M3, Inc. 2413

Company

エムスリー株式会社M3, Inc.

Investors

Buys

Total Value

¥329.8B ($2.1B)

Avg Return

-15.79%

Last Filing

2026-05-11

M3, Inc. (2413) has 21 disclosed large-shareholding filings and 12 disclosed disposals on record, filed by 17 distinct investors. Together those filings cover ¥329.8B ($2.1B) in reported transaction value. The earliest filing StockDrifts holds for M3, Inc. is dated 2021-04-05; the most recent is 2026-05-11. 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 -15.79%, 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
2026-08-10	BUY	acquisition	オアシスマネジメントカンパニーリミテッド(Oasis Management Company Ltd.) Oasis Management Company Ltd.	activist	34.2M	¥1,538	+10.4%	¥52.5B ($339.0M)
2026-05-22	BUY	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ.	passive	5.7M	¥1,417.5	+15.5%	¥193M ($1.2M)
2026-05-22	BUY	Market Buy	ブラックロック・ファンド・アドバイザーズ	passive	8.9M	¥1,417.5	+15.5%	¥578M ($3.7M)
2026-05-22	BUY	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド	passive	3.5M	¥1,417.5	+15.5%	¥674M ($4.3M)
2026-05-22	SELL	Market Buy	BlackRockS.A. Luxembourg	passive	31.4K	¥1,417.5	-15.5%	¥4.4B ($28.6M)
2026-05-22	SELL	Market Buy	BlackRock Fund Managers Limited	passive	1.1M	¥1,417.5	-15.5%	¥578M ($3.7M)
2026-05-22	BUY	Market Buy	BlackRockBV Netherlands	passive	1.2M	¥1,417.5	+15.5%	¥578M ($3.7M)
2026-05-22	SELL	Market Buy	ブラックロック・アドバイザーズ・エルエルシー	passive	300.6K	¥1,417.5	-15.5%	¥2.2B ($14.3M)
2026-05-22	BUY	Market Buy	アペリオ・グループ・エルエルシー Aperio Group, LLC	passive	915.1K	¥1,417.5	+15.5%	¥289M ($1.9M)
2026-05-22	SELL	Market Buy	ブラックロック・ジャパン株式会社	passive	9.3M	¥1,417.5	-15.5%	¥2.0B ($13.0M)
2026-05-22	BUY	Market Buy	BlackRock Investment ManagementLimited UK	passive	998.3K	¥1,417.5	+15.5%	¥1.4B ($9.1M)
2026-05-11	SELL	unknown	野村アセットマネジメント株式会社	other	38.6M	¥1,350.5	-17.7%	¥917M ($5.9M)
2026-05-11	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	3.8M	¥1,350.5	+17.7%	¥2.2B ($14.2M)
2026-05-11	BUY	unknown	野村證券株式会社	other	95.0K	¥1,350.5	+17.7%	¥128M ($828K)
2026-04-06	BUY	unknown	野村アセットマネジメント株式会社	other	39.3M	¥1,636	-8.5%	¥7.7B ($49.5M)
2026-04-06	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	2.1M	¥1,636	+8.5%	¥2.9B ($18.6M)
2026-04-06	SELL	unknown	野村證券株式会社	other	67.5K	¥1,636	+8.5%	¥222M ($1.4M)
2026-02-19	BUY	Market Buy	野村アセットマネジメント株式会社	other	34.6M	¥1,602	-1.0%	¥54.9B ($354.3M)
2026-02-19	BUY	Market Buy	野村證券株式会社	other	191.2K	¥1,602	-1.0%	¥303M ($2.0M)
2026-02-19	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	3.9M	¥1,602	+1.0%	¥6.1B ($39.5M)
2025-11-07	BUY	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	33.4M	¥2,104.5	-24.7%	¥8.6B ($55.3M)
2025-11-07	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	4.4M	¥2,104.5	+24.7%	¥6.1B ($39.6M)
2025-11-07	SELL	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	20.8K	¥2,104.5	+24.7%	¥715M ($4.6M)
2025-05-20	BUY	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ.(BlackRock Institutional Trust Company BlackRock Institutional Trust Company, N.A.	passive	5.6M	¥1,983.5	-20.1%	¥11.1B ($71.7M)
2025-05-20	BUY	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	8.5M	¥1,983.5	-20.1%	¥16.9B ($108.9M)
2025-05-20	BUY	Market Buy	ブラックロック(ルクセンブルグ)エス・エーS.A.) BlackRock (Luxembourg	passive	3.2M	¥1,983.5	-20.1%	¥6.3B ($40.3M)
2025-05-20	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	807.0K	¥1,983.5	-20.1%	¥1.6B ($10.3M)
2025-05-20	BUY	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	3.1M	¥1,983.5	-20.1%	¥6.1B ($39.1M)
2025-05-20	BUY	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	1.4M	¥1,983.5	-20.1%	¥2.8B ($18.2M)
2025-05-20	BUY	Market Buy	ブラックロック・アドバイザーズ・エルエルシー(BlackRock Advisers BlackRock Advisers, LLC	passive	1.8M	¥1,983.5	-20.1%	¥3.6B ($23.5M)
2025-05-20	BUY	Market Buy	アペリオ・グループ・エルエルシー(Aperio Group Aperio Group, LLC	passive	679.8K	¥1,983.5	-20.1%	¥1.3B ($8.7M)
2025-05-20	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	10.6M	¥1,983.5	-20.1%	¥21.1B ($136.1M)
2025-04-03	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	29.3M	¥1,643.5	-3.5%	¥47.6B ($306.8M)
2025-04-03	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	7.4M	¥1,643.5	-3.5%	¥12.1B ($78.0M)
2025-04-03	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	305.9K	¥1,643.5	-3.5%	¥503M ($3.2M)
2024-08-06	BUY	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	24.6M	¥1,214	+30.6%	¥29.4B ($189.8M)
2024-08-06	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	3.5M	¥1,214	+30.6%	¥4.2B ($27.1M)
2024-07-03	BUY	Market Buy	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	35.4M	¥1,504.5	+5.4%	¥52.6B ($339.1M)
2024-07-03	BUY	Market Buy	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	3.5M	¥1,504.5	+5.4%	¥1.4B ($9.2M)
2023-12-05	BUY	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	44.2M	¥2,266.5	-30.1%	¥99.0B ($638.8M)
2023-12-05	SELL	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	2.5M	¥2,266.5	+30.1%	¥4.0B ($25.8M)
2023-07-21	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	17.7M	¥3,089	+48.7%	¥1.5B ($9.5M)
2023-07-21	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	14.4M	¥3,089	+48.7%	¥5.5B ($35.2M)
2022-11-07	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	18.2M	¥4,146	-61.8%	¥75.3B ($486.1M)
2022-11-07	BUY	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	16.1M	¥4,146	-61.8%	¥66.9B ($431.8M)
2021-12-06	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	18.1M	¥5,752	+72.4%	¥7.8B ($50.4M)
2021-12-06	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	13.8M	¥5,752	+72.4%	¥5.9B ($37.8M)
2021-04-05	SELL	unknown	ソニーグループ株式会社 Sony Group Corporation	other	230.5M	¥8,014	+80.2%	¥2.7B ($17.5M)

Frequently asked questions

Who has been buying M3, Inc. stock?: 17 distinct investors have filed 21 disclosed large-shareholding filings in M3, Inc. (2413), most recently on 2026-05-11. 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 M3, Inc. have?: M3, Inc. has 21 buy-side and 12 sell-side disclosures on record, covering ¥329.8B ($2.1B) in total reported value, spanning 2021-04-05 to 2026-05-11.
Where does StockDrifts get M3, 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 M3, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.