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

11 distinct investors have filed 39 disclosed large-shareholding filings in Mitsuboshi Co., Ltd. (5820), most recently on 2026-04-28. 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 Mitsuboshi Co., Ltd. have?

Mitsuboshi Co., Ltd. has 39 buy-side and 31 sell-side disclosures on record, covering ¥1.8B ($11.5M) in total reported value, spanning 2021-09-06 to 2026-04-28.

Where does StockDrifts get Mitsuboshi 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.

Mitsuboshi Co., Ltd. 5820

Company

株式会社三ツ星Mitsuboshi Co., Ltd.

Investors

Buys

Total Value

¥1.8B ($11.5M)

Avg Return

-42.40%

Last Filing

2026-04-28

Mitsuboshi Co., Ltd. (5820) has 39 disclosed large-shareholding filings and 31 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥1.8B ($11.5M) in reported transaction value. The earliest filing StockDrifts holds for Mitsuboshi Co., Ltd. is dated 2021-09-06; the most recent is 2026-04-28. 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 -42.40%, 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
2026-07-17	SELL	Market Buy	Francis Capital IncCEO Lee Wan Yu Francis Capital Inc	passive	2.9M	¥711	-13.6%	¥202M ($1.3M)
2026-05-19	BUY	Market Buy	Francis Capital IncCEO Lee Wan Yu Francis Capital Inc	passive	3.0M	¥749	-13.2%	¥20M ($127K)
2026-05-19	SELL	Market Buy	Francis Capital IncCEO Lee Wan Yu Francis Capital Inc	passive	3.0M	¥749	+13.2%	¥29M ($185K)
2026-04-28	SELL	Market Buy	Francis Capital IncCEO Lee Wan Yu Francis Capital Inc	passive	3.1M	¥808	+9.7%	¥31M ($198K)
2026-04-28	BUY	Market Buy	Francis Capital IncCEO Lee Wan Yu Francis Capital Inc	passive	3.1M	¥808	-9.7%	¥31M ($198K)
2026-04-28	BUY	Market Buy	Francis Capital IncCEO Lee Wan Yu Francis Capital Inc	passive	3.1M	¥808	-9.7%	¥21M ($135K)
2026-03-13	SELL	Market Buy	Francis Capital IncCEO Lee Wan Yu Francis Capital Inc	passive	3.2M	¥907	+4.2%	¥95M ($611K)
2026-03-13	BUY	Market Buy	Francis Capital IncCEO Lee Wan Yu Francis Capital Inc	passive	3.2M	¥907	-4.2%	¥37M ($238K)
2026-03-05	BUY	Market Buy	Francis Capital IncCEO Lee Wan Yu Francis Capital Inc	passive	3.4M	¥1,060	-18.0%	¥28M ($179K)
2026-03-05	SELL	Market Buy	Francis Capital IncCEO Lee Wan Yu Francis Capital Inc	passive	3.4M	¥1,060	+18.0%	¥56M ($364K)
2026-01-23	BUY	Market Buy	Francis Capital IncCEO Lee Wan Yu Francis Capital Inc	passive	3.5M	¥701	+24.0%	¥2.5B ($15.8M)
2024-06-14	BUY	Market Buy	株式会社シンシア工務店 SINCERE KOUMUTEN CO., LTD.	passive	80.4K	¥1,820	-52.3%	¥27M ($173K)
2024-06-14	BUY	Market Buy	株式会社シンシア工務店 SINCERE KOUMUTEN CO., LTD.	passive	100.8K	¥1,820	-52.3%	¥37M ($239K)
2024-06-14	BUY	Market Buy	株式会社シンシア工務店 SINCERE KOUMUTEN CO., LTD.	passive	115.5K	¥1,820	-52.3%	¥27M ($173K)
2024-06-14	BUY	Market Buy	株式会社シンシア工務店 SINCERE KOUMUTEN CO., LTD.	passive	128.7K	¥1,820	-52.3%	¥24M ($155K)
2024-06-14	BUY	Market Buy	株式会社シンシア工務店 SINCERE KOUMUTEN CO., LTD.	passive	141.6K	¥1,820	-52.3%	¥24M ($152K)
2024-06-14	BUY	unknown	株式会社シンシア工務店 SINCERE KOUMUTEN CO., LTD.	other	143.3K	¥1,820	-52.3%	¥3M ($19K)
2024-06-14	SELL	Market Buy	株式会社シンシア工務店 SINCERE KOUMUTEN CO., LTD.	passive	80.3K	¥1,820	+52.3%	¥115M ($739K)
2024-06-14	BUY	unknown	株式会社シンシア工務店 SINCERE KOUMUTEN CO., LTD.	other	80.3K	¥1,820	-52.3%	¥115M ($739K)
2024-06-14	BUY	Market Buy	株式会社シンシア工務店 SINCERE KOUMUTEN CO., LTD.	passive	65.7K	¥1,820	-52.3%	¥120M ($771K)
2024-06-13	BUY	Market Buy	株式会社和円商事 Waen Shoji Co., Ltd.	passive	25.0K	¥1,777	-51.1%	¥44M ($287K)
2024-06-13	SELL	Market Buy	株式会社和円商事 Waen Shoji Co., Ltd.	passive	0	¥1,777	+51.1%	¥8M ($51K)
2024-06-13	SELL	Market Buy	株式会社和円商事 Waen Shoji Co., Ltd.	passive	4.4K	¥1,777	+51.1%	¥36M ($235K)
2024-06-13	BUY	Market Buy	株式会社和円商事 Waen Shoji Co., Ltd.	passive	25.0K	¥1,777	-51.1%	¥44M ($287K)
2024-06-13	BUY	Market Buy	本多敏行 HONDA TOSHIYUKI	passive	65.7K	¥1,777	-51.1%	¥117M ($753K)
2024-06-13	BUY	Market Buy	本多敏行 HONDA TOSHIYUKI	passive	79.5K	¥1,777	-51.1%	¥25M ($158K)
2024-06-13	BUY	Market Buy	本多敏行 HONDA TOSHIYUKI	passive	92.3K	¥1,777	-51.1%	¥23M ($147K)
2024-06-13	SELL	Market Buy	本多敏行 HONDA TOSHIYUKI	passive	67.3K	¥1,777	+51.1%	¥45M ($288K)
2024-06-13	BUY	Market Buy	本多敏行 HONDA TOSHIYUKI	passive	67.3K	¥1,777	-51.1%	¥120M ($772K)
2024-06-13	BUY	Market Buy	本多敏行 HONDA TOSHIYUKI	passive	54.3K	¥1,777	-51.1%	¥95M ($615K)
2024-06-13	BUY	Market Buy	本多敏行 HONDA TOSHIYUKI	passive	65.2K	¥1,777	-51.1%	¥116M ($747K)
2024-06-13	SELL	Market Buy	本多敏行 HONDA TOSHIYUKI	passive	67.3K	¥1,777	+51.1%	¥45M ($288K)
2023-05-31	SELL	unknown	スリースター有限会社 surisuta	other	90.6K	¥2,158	+59.7%	¥4M ($26K)
2023-04-06	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	2.5K	¥2,373.33	-63.4%	¥4M ($29K)
2023-04-03	BUY	unknown	スリースター有限会社 surisuta	other	56.8K	¥2,490	-65.1%	¥89M ($576K)
2023-04-03	BUY	unknown	スリースター有限会社 surisuta	other	56.8K	¥2,490	-65.1%	¥84M ($543K)
2023-04-03	SELL	unknown	塚本粹子 Suiko Tsukamoto	unknown	0	¥2,490	+65.1%	¥28M ($179K)
2023-04-03	BUY	unknown	スリースター有限会社 surisuta	other	92.6K	¥2,490	-65.1%	¥231M ($1.5M)
2023-04-03	BUY	unknown	スリースター有限会社 surisuta	other	92.6K	¥2,490	-65.1%	¥231M ($1.5M)
2023-04-03	BUY	unknown	スリースター有限会社 surisuta	other	92.6K	¥2,490	-65.1%	¥231M ($1.5M)
2023-04-03	BUY	unknown	スリースター有限会社 surisuta	other	92.6K	¥2,490	-65.1%	¥228M ($1.5M)
2023-04-03	SELL	unknown	塚本粹子 Suiko Tsukamoto	unknown	0	¥2,490	+65.1%	¥27M ($173K)
2023-04-03	SELL	unknown	スリースター有限会社 surisuta	other	56.8K	¥2,490	+65.1%	¥67M ($435K)
2023-04-03	SELL	unknown	塚本粹子 Suiko Tsukamoto	unknown	0	¥2,490	+65.1%	¥28M ($179K)
2023-04-03	SELL	unknown	塚本粹子 Suiko Tsukamoto	unknown	0	¥2,490	+65.1%	¥28M ($179K)
2023-03-29	SELL	unknown	塚本粹子 Suiko Tsukamoto	unknown	0	¥2,560	+66.0%	¥28M ($184K)
2023-03-29	BUY	unknown	スリースター有限会社 surisuta	strategic	92.6K	¥2,560	-66.0%	¥237M ($1.5M)
2023-03-22	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	64.2K	¥2,330	-62.7%	¥295K ($2K)
2023-03-14	BUY	unknown	スリースター有限会社 surisuta	strategic	92.6K	¥1,780	-51.2%	¥163M ($1.1M)
2023-03-14	BUY	unknown	スリースター有限会社 surisuta	strategic	92.6K	¥1,780	-51.2%	¥165M ($1.1M)

Showing the 50 most recent of 120 filings.

Frequently asked questions

Who has been buying Mitsuboshi Co., Ltd. stock?: 11 distinct investors have filed 39 disclosed large-shareholding filings in Mitsuboshi Co., Ltd. (5820), most recently on 2026-04-28. 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 Mitsuboshi Co., Ltd. have?: Mitsuboshi Co., Ltd. has 39 buy-side and 31 sell-side disclosures on record, covering ¥1.8B ($11.5M) in total reported value, spanning 2021-09-06 to 2026-04-28.
Where does StockDrifts get Mitsuboshi 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 Mitsuboshi Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.