Who has been buying Mandom Corporation stock?

19 distinct investors have filed 32 disclosed large-shareholding filings in Mandom Corporation (4917), most recently on 2026-05-15. 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 Mandom Corporation have?

Mandom Corporation has 32 buy-side and 23 sell-side disclosures on record, covering ¥67.4B ($435.1M) in total reported value, spanning 2022-04-14 to 2026-05-15.

Where does StockDrifts get Mandom Corporation 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.

Mandom Corporation 4917

Company

株式会社マンダムMandom Corporation

Investors

Buys

Total Value

¥67.4B ($435.1M)

Avg Return

+38.97%

Last Filing

2026-05-15

Mandom Corporation (4917) has 32 disclosed large-shareholding filings and 23 disclosed disposals on record, filed by 19 distinct investors. Together those filings cover ¥67.4B ($435.1M) in reported transaction value. The earliest filing StockDrifts holds for Mandom Corporation is dated 2022-04-14; the most recent is 2026-05-15. 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 +38.97%, 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
2026-05-15	BUY	Market Buy	クレディアンドスリエルエコメルシアル(CREDIT INDUSTRIEL ET COMMERCIAL) CREDIT INDUSTRIEL ET COMMERCIAL	passive	2.6M	¥3,085	+0.0%	¥7.9B ($50.8M)
2026-03-05	SELL	Market Buy	野村アセットマネジメント株式会社	other	1.1M	¥3,080	-0.2%	¥3.5B ($22.7M)
2026-03-05	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	211.5K	¥3,080	-0.2%	¥653M ($4.2M)
2026-03-05	BUY	Market Buy	野村證券株式会社	other	58.9K	¥3,080	+0.2%	¥182M ($1.2M)
2026-03-04	BUY	unknown	西村健	unknown	47.8K	¥3,085	+0.0%	¥147M ($951K)
2026-03-04	SELL	unknown	西村健	strategic	47.8K	¥3,085	+0.0%	¥147M ($951K)
2026-03-04	SELL	unknown	ひびき・パース・アドバイザーズ・エスピーシー(Hibiki Path Advisors SPC) Hibiki Path Advisors SPC	unknown	0	¥3,085	+0.0%	¥7.7B ($49.7M)
2026-03-04	SELL	unknown	西村健	strategic	47.8K	¥3,085	+0.0%	¥147M ($951K)
2026-03-04	SELL	unknown	西村元延	strategic	45.5K	¥3,085	+0.0%	¥140M ($906K)
2026-03-04	BUY	unknown	M・Nホールディングス株式会社	strategic	1.1M	¥3,085	+0.0%	¥3.3B ($21.3M)
2026-03-04	BUY	unknown	公益財団法人西村奨学財団	other	3.6M	¥3,085	+0.0%	¥11.1B ($71.7M)
2026-03-04	SELL	unknown	西村元延	strategic	45.5K	¥3,085	+0.0%	¥140M ($906K)
2026-03-04	BUY	unknown	M・Nホールディングス株式会社	strategic	1.1M	¥3,085	+0.0%	¥3.3B ($21.3M)
2026-03-04	BUY	unknown	公益財団法人西村奨学財団	other	3.6M	¥3,085	+0.0%	¥11.1B ($71.7M)
2026-03-04	BUY	unknown	西村元延	unknown	45.5K	¥3,085	+0.0%	¥140M ($906K)
2026-03-04	BUY	unknown	M・Nホールディングス株式会社	unknown	1.1M	¥3,085	+0.0%	¥3.3B ($21.3M)
2026-03-04	BUY	unknown	カロンホールディングス株式会社	activist	32.4M	¥3,085	+0.0%	¥99.8B ($644.1M)
2026-03-04	BUY	acquisition	西村元延	unknown	45.5K	¥3,085	+0.0%	¥140M ($906K)
2026-03-04	BUY	acquisition	M・Nホールディングス株式会社	unknown	1.1M	¥3,085	+0.0%	¥3.3B ($21.3M)
2026-03-04	BUY	acquisition	カロンホールディングス株式会社	activist	32.4M	¥3,085	+0.0%	¥99.8B ($644.1M)
2026-03-04	SELL	unknown	株式会社ATRA	unknown	0	¥3,085	+0.0%	-
2026-03-04	SELL	unknown	株式会社シティインデックスファースト	unknown	0	¥3,085	+0.0%	-
2026-03-04	SELL	unknown	野村絢	unknown	0	¥3,085	+0.0%	-
2026-03-04	BUY	unknown	株式会社シティインデックスイレブンス	unknown	0	¥3,085	+0.0%	-
2026-03-04	BUY	acquisition	西村健	unknown	47.8K	¥3,085	+0.0%	¥147M ($951K)
2026-01-22	SELL	unknown	ひびき・パース・アドバイザーズ(Hibiki Path Advisors Pte. Ltd.) Hibiki Path Advisors Pte. Ltd.	unknown	0	¥3,140	+1.8%	¥7.6B ($49.0M)
2026-01-22	BUY	Market Buy	ひびき・パース・アドバイザーズ・エスピーシー(Hibiki Path Advisors SPC) Hibiki Path Advisors SPC	activist	2.5M	¥3,140	-1.8%	¥7.8B ($50.6M)
2026-01-09	BUY	unknown	野村アセットマネジメント株式会社	other	1.1M	¥2,845	+8.4%	¥3.5B ($22.8M)
2026-01-09	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.7M	¥2,845	-8.4%	¥5.1B ($33.2M)
2026-01-09	BUY	unknown	野村證券株式会社	other	4.9K	¥2,845	-8.4%	¥15M ($97K)
2025-12-19	BUY	Market Buy	野村アセットマネジメント株式会社	other	1.1M	¥2,795	-10.4%	¥3.5B ($22.6M)
2025-12-19	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	2.6M	¥2,795	+10.4%	¥7.9B ($51.3M)
2025-12-19	BUY	Market Buy	野村證券株式会社	other	5.2K	¥2,795	-10.4%	¥16M ($103K)
2025-12-16	BUY	unknown	株式会社ATRA	activist	678.6K	¥2,804	-10.0%	¥2.1B ($13.5M)
2025-12-16	BUY	unknown	株式会社シティインデックスファースト	activist	4.5M	¥2,804	-10.0%	¥13.9B ($89.5M)
2025-12-16	BUY	unknown	野村絢	activist	4.5M	¥2,804	-10.0%	¥13.9B ($89.6M)
2025-12-16	BUY	unknown	株式会社シティインデックスイレブンス	activist	100	¥2,804	-10.0%	¥309K ($2K)
2025-12-04	BUY	Market Buy	株式会社ATRA	activist	678.6K	¥2,513	+22.8%	¥2.1B ($13.5M)
2025-12-04	BUY	Market Buy	株式会社シティインデックスファースト	activist	4.5M	¥2,513	-22.8%	¥13.9B ($89.5M)
2025-12-04	BUY	Market Buy	野村絢	activist	4.5M	¥2,513	-22.8%	¥13.9B ($89.6M)
2025-12-04	BUY	Market Buy	株式会社シティインデックスイレブンス	activist	100	¥2,513	-22.8%	¥309K ($2K)
2025-12-03	BUY	unknown	西村健	strategic	100.1K	¥2,513	-22.8%	¥309M ($2.0M)
2025-12-03	BUY	unknown	西村元延	strategic	933.0K	¥2,513	-22.8%	¥2.9B ($18.6M)
2025-12-03	BUY	unknown	M・Nホールディングス株式会社	strategic	1.1M	¥2,513	-22.8%	¥3.3B ($21.3M)
2025-12-03	BUY	unknown	公益財団法人西村奨学財団	other	3.6M	¥2,513	-22.8%	¥11.1B ($71.7M)
2025-12-03	BUY	unknown	西村健	strategic	100.1K	¥2,513	-22.8%	¥309M ($2.0M)
2025-12-03	BUY	unknown	西村元延	strategic	933.0K	¥2,513	-22.8%	¥2.9B ($18.6M)
2025-12-03	BUY	unknown	M・Nホールディングス株式会社	strategic	1.1M	¥2,513	-22.8%	¥3.3B ($21.3M)
2025-12-03	BUY	unknown	公益財団法人西村奨学財団	other	3.6M	¥2,513	-22.8%	¥11.1B ($71.7M)
2025-12-03	BUY	unknown	M・Nホールディングス株式会社	strategic	1.1M	¥2,513	-22.8%	¥3.3B ($21.3M)

Showing the 50 most recent of 120 filings.

Frequently asked questions

Who has been buying Mandom Corporation stock?: 19 distinct investors have filed 32 disclosed large-shareholding filings in Mandom Corporation (4917), most recently on 2026-05-15. 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 Mandom Corporation have?: Mandom Corporation has 32 buy-side and 23 sell-side disclosures on record, covering ¥67.4B ($435.1M) in total reported value, spanning 2022-04-14 to 2026-05-15.
Where does StockDrifts get Mandom Corporation 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 Mandom Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.