Who has been buying MBK Co.,Ltd. stock?

6 distinct investors have filed 23 disclosed large-shareholding filings in MBK Co.,Ltd. (3121), most recently on 2026-04-13. 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 MBK Co.,Ltd. have?

MBK Co.,Ltd. has 23 buy-side and 29 sell-side disclosures on record, covering ¥634M ($4.1M) in total reported value, spanning 2021-04-12 to 2026-04-13.

Where does StockDrifts get MBK 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.

MBK Co.,Ltd. 3121

Company

マーチャント・バンカーズ株式会社MBK Co.,Ltd.

Investors

Buys

Total Value

¥634M ($4.1M)

Avg Return

-19.05%

Last Filing

2026-04-13

MBK Co.,Ltd. (3121) has 23 disclosed large-shareholding filings and 29 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥634M ($4.1M) in reported transaction value. The earliest filing StockDrifts holds for MBK Co.,Ltd. is dated 2021-04-12; the most recent is 2026-04-13. 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 -19.05%, 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
2026-06-24	SELL	Market Buy	トータルネットワークホールディングスリミテッド (TOTAL NETWORK HOLDINGS LIMITED) TOTAL NETWORK HOLDINGS LIMITED	passive	917.4K	¥217	+0.0%	¥342M ($2.2M)
2026-06-24	BUY	Market Buy	トータルネットワークホールディングスリミテッド (TOTAL NETWORK HOLDINGS LIMITED) TOTAL NETWORK HOLDINGS LIMITED	passive	917.4K	¥217	+0.0%	¥342M ($2.2M)
2026-06-23	BUY	Market Buy	中村昌弘 Masahiro Nakamura	passive	4.0M	¥215	+0.9%	¥191M ($1.2M)
2026-06-01	SELL	Market Buy	株式会社ぽると Porte, Inc.	passive	4.0M	¥225	+4.9%	¥185M ($1.2M)
2026-06-01	BUY	Market Buy	株式会社ぽると Porte, Inc.	passive	4.0M	¥225	-4.9%	¥185M ($1.2M)
2026-05-15	BUY	Market Buy	トータルネットワークホールディングスリミテッド (TOTAL NETWORK HOLDINGS LIMITED) TOTAL NETWORK HOLDINGS LIMITED	passive	2.4M	¥220	+1.4%	¥173M ($1.1M)
2026-05-15	SELL	Market Buy	トータルネットワークホールディングスリミテッド (TOTAL NETWORK HOLDINGS LIMITED) TOTAL NETWORK HOLDINGS LIMITED	passive	2.4M	¥220	-1.4%	¥173M ($1.1M)
2026-04-13	SELL	Market Buy	株式会社ぽると Porte, Inc.	passive	4.7M	¥233	+9.9%	¥76M ($488K)
2026-04-03	SELL	Market Buy	トータルネットワークホールディングスリミテッド (TOTAL NETWORK HOLDINGS LIMITED) TOTAL NETWORK HOLDINGS LIMITED	passive	4.5M	¥230	+8.7%	¥73M ($472K)
2026-04-03	SELL	Market Buy	トータルネットワークホールディングスリミテッド (TOTAL NETWORK HOLDINGS LIMITED) TOTAL NETWORK HOLDINGS LIMITED	passive	3.2M	¥230	+8.7%	¥293M ($1.9M)
2026-03-06	BUY	Market Buy	アートポートインベスト株式会社代表取締役松下順一 Art Port Invest, Inc.	strategic	11.5M	¥213	+6.6%	¥83M ($538K)
2025-12-15	BUY	Market Buy	アートポートインベスト株式会社代表取締役松下順一 Art Port Invest, Inc.	strategic	11.1M	¥214	+6.1%	¥137M ($883K)
2025-12-15	BUY	negotiated	アートポートインベスト株式会社代表取締役松下順一 Art Port Invest, Inc.	strategic	11.1M	¥214	+6.1%	¥137M ($883K)
2025-11-04	BUY	Market Buy	アートポートインベスト株式会社代表取締役松下順一 Art Port Invest, Inc.	strategic	10.4M	¥250	-9.2%	¥87M ($559K)
2025-10-06	BUY	Market Buy	Hong Kong Sunlight House Limited	engagement	1.3M	¥275	-17.4%	¥370M ($2.4M)
2025-10-06	BUY	Market Buy	Hong Kong Sunlight House Limited	engagement	1.3M	¥275	-17.4%	¥267M ($1.7M)
2025-10-06	BUY	Market Buy	アートポートインベスト株式会社代表取締役松下順一 Art Port Invest, Inc.	strategic	10.1M	¥275	-17.4%	¥91M ($587K)
2025-09-17	SELL	Market Buy	Hong Kong Sunlight House Limited	engagement	2.3M	¥274	+17.1%	¥1.8B ($11.7M)
2025-09-17	BUY	Market Buy	Hong Kong Sunlight House Limited	engagement	2.0M	¥274	-17.1%	¥541M ($3.5M)
2025-09-17	BUY	Market Buy	Hong Kong Sunlight House Limited	engagement	2.0M	¥274	-17.1%	¥541M ($3.5M)
2025-08-07	SELL	negotiated	アートポートインベスト株式会社代表取締役松下順一 Art Port Invest, Inc.	strategic	9.8M	¥293	+22.5%	¥137M ($884K)
2025-07-23	BUY	acquisition	Hong Kong Sunlight House Limited	engagement	2.3M	¥338	-32.8%	¥783M ($5.1M)
2025-07-23	SELL	Market Buy	トータルネットワークホールディングスリミテッド (TOTAL NETWORK HOLDINGS LIMITED) TOTAL NETWORK HOLDINGS LIMITED	passive	4.8M	¥338	+32.8%	¥129M ($832K)
2025-07-23	BUY	Market Buy	Hong Kong Sunlight House Limited	engagement	11.5M	¥338	-32.8%	¥3.9B ($25.1M)
2025-07-23	BUY	Market Buy	Hong Kong Sunlight House Limited	engagement	11.5M	¥338	-32.8%	¥3.9B ($25.1M)
2025-07-22	SELL	Market Buy	株式会社ぽると Porte, Inc.	passive	5.0M	¥338	+32.8%	¥201M ($1.3M)
2025-07-18	SELL	Market Buy	トータルネットワークホールディングスリミテッド (TOTAL NETWORK HOLDINGS LIMITED) TOTAL NETWORK HOLDINGS LIMITED	passive	4.8M	¥335	+32.2%	¥100M ($644K)
2025-06-24	SELL	Market Buy	トータルネットワークホールディングスリミテッド (TOTAL NETWORK HOLDINGS LIMITED) TOTAL NETWORK HOLDINGS LIMITED	passive	5.1M	¥375	+39.5%	¥123M ($792K)
2025-06-12	SELL	Market Buy	株式会社ぽると Porte, Inc.	passive	5.2M	¥334	+32.0%	¥104M ($674K)
2025-05-02	BUY	Market Buy	トータルネットワークホールディングスリミテッド (TOTAL NETWORK HOLDINGS LIMITED) TOTAL NETWORK HOLDINGS LIMITED	passive	5.4M	¥288	-21.2%	¥161M ($1.0M)
2025-05-02	SELL	Market Buy	トータルネットワークホールディングスリミテッド (TOTAL NETWORK HOLDINGS LIMITED) TOTAL NETWORK HOLDINGS LIMITED	passive	5.4M	¥288	+21.2%	¥161M ($1.0M)
2024-12-18	BUY	Market Buy	株式会社ぽると Porte, Inc.	passive	5.5M	¥294	-22.8%	¥88M ($565K)
2024-11-22	BUY	Market Buy	株式会社ぽると Porte, Inc.	passive	5.2M	¥271	-16.2%	¥97M ($624K)
2024-11-22	BUY	Market Buy	株式会社ぽると Porte, Inc.	passive	5.2M	¥271	-16.2%	¥97M ($624K)
2024-09-05	SELL	Market Buy	株式会社JKMTファイナンス JKMT Finance, Inc.	passive	1.2M	¥300	+24.3%	¥245M ($1.6M)
2024-08-07	BUY	Market Buy	株式会社ぽると Porte, Inc.	passive	4.8M	¥296	-23.3%	¥89M ($574K)
2024-07-05	SELL	Market Buy	株式会社JKMTファイナンス JKMT Finance, Inc.	passive	2.3M	¥309	+26.5%	¥91M ($588K)
2024-05-16	SELL	Market Buy	株式会社JKMTファイナンス JKMT Finance, Inc.	passive	2.3M	¥288	+21.2%	¥86M ($553K)
2024-03-29	SELL	Market Buy	株式会社JKMTファイナンス JKMT Finance, Inc.	passive	2.6M	¥274	+17.1%	¥86M ($558K)
2024-02-19	BUY	Market Buy	株式会社ぽると Porte, Inc.	passive	4.5M	¥272	-16.5%	¥87M ($564K)
2024-01-31	BUY	Market Buy	株式会社JKMTファイナンス JKMT Finance, Inc.	passive	2.9M	¥285	-20.4%	¥88M ($569K)
2024-01-31	SELL	Market Buy	株式会社JKMTファイナンス JKMT Finance, Inc.	passive	2.9M	¥285	+20.4%	¥88M ($569K)
2024-01-05	SELL	negotiated	株式会社JKMTファイナンス JKMT Finance, Inc.	strategic	3.2M	¥329	+31.0%	¥103M ($664K)
2023-12-22	SELL	negotiated	株式会社JKMTファイナンス JKMT Finance, Inc.	strategic	3.5M	¥344	+34.0%	¥102M ($661K)
2023-12-01	SELL	negotiated	株式会社JKMTファイナンス JKMT Finance, Inc.	strategic	3.8M	¥325	+30.1%	¥99M ($637K)
2023-11-09	SELL	negotiated	株式会社JKMTファイナンス JKMT Finance, Inc.	strategic	4.1M	¥306	+25.8%	¥90M ($582K)
2023-11-09	BUY	negotiated	株式会社JKMTファイナンス JKMT Finance, Inc.	strategic	4.1M	¥306	-25.8%	¥90M ($582K)
2023-10-20	BUY	Market Buy	株式会社ぽると Porte, Inc.	passive	4.2M	¥311	-27.0%	¥92M ($592K)
2023-08-17	BUY	Market Buy	株式会社ぽると Porte, Inc.	passive	3.9M	¥300	-24.3%	¥92M ($594K)
2023-07-19	SELL	negotiated	株式会社JKMTファイナンス JKMT Finance, Inc.	strategic	4.4M	¥298	+23.8%	¥88M ($567K)

Showing the 50 most recent of 77 filings.

Frequently asked questions

Who has been buying MBK Co.,Ltd. stock?: 6 distinct investors have filed 23 disclosed large-shareholding filings in MBK Co.,Ltd. (3121), most recently on 2026-04-13. 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 MBK Co.,Ltd. have?: MBK Co.,Ltd. has 23 buy-side and 29 sell-side disclosures on record, covering ¥634M ($4.1M) in total reported value, spanning 2021-04-12 to 2026-04-13.
Where does StockDrifts get MBK 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 MBK Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.