Who has been buying SAMCO Inc. stock?

12 distinct investors have filed 33 disclosed large-shareholding filings in SAMCO Inc. (6387), most recently on 2026-05-07. 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 SAMCO Inc. have?

SAMCO Inc. has 33 buy-side and 24 sell-side disclosures on record, covering ¥9.8B ($63.4M) in total reported value, spanning 2021-03-18 to 2026-05-07.

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.

SAMCO Inc. 6387

Company

サムコ株式会社SAMCO Inc.

Investors

Buys

Total Value

¥9.8B ($63.4M)

Avg Return

+126.32%

Last Filing

2026-05-07

SAMCO Inc. (6387) has 33 disclosed large-shareholding filings and 24 disclosed disposals on record, filed by 12 distinct investors. Together those filings cover ¥9.8B ($63.4M) in reported transaction value. The earliest filing StockDrifts holds for SAMCO Inc. is dated 2021-03-18; the most recent is 2026-05-07. Across these filings the average return since disclosure is +126.32%, 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
2026-09-07	SELL	unknown	野村アセットマネジメント株式会社	other	488.7K	¥9,140	+14.8%	¥66M ($427K)
2026-09-07	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	3.4K	¥9,140	+14.8%	¥7M ($47K)
2026-09-07	SELL	unknown	野村證券株式会社	other	118.9K	¥9,140	+14.8%	¥515M ($3.3M)
2026-06-22	BUY	Market Buy	野村證券株式会社	other	175.3K	¥15,590	-50.0%	¥75M ($485K)
2026-06-22	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	3.9K	¥15,590	+50.0%	¥589M ($3.8M)
2026-06-22	SELL	unknown	野村アセットマネジメント株式会社	other	496.4K	¥15,590	+50.0%	¥88M ($566K)
2026-05-21	SELL	unknown	野村證券株式会社	other	170.7K	¥10,820	+28.0%	¥9M ($56K)
2026-05-21	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	41.9K	¥10,820	+28.0%	¥496M ($3.2M)
2026-05-21	BUY	Market Buy	野村アセットマネジメント株式会社	other	501.6K	¥10,820	-28.0%	¥17M ($112K)
2026-05-07	BUY	unknown	野村證券株式会社	other	171.1K	¥14,370	-	-
2026-05-07	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	87.8K	¥14,370	+45.8%	¥1.3B ($8.1M)
2026-05-07	BUY	Market Buy	野村アセットマネジメント株式会社	other	500.6K	¥14,370	-45.8%	¥23M ($149K)
2026-04-30	BUY	Market Buy	野村證券株式会社	other	171.0K	¥11,560	-32.6%	¥223M ($1.4M)
2026-04-30	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	175.3K	¥11,560	+32.6%	¥65M ($420K)
2026-04-30	BUY	Market Buy	野村アセットマネジメント株式会社	other	498.4K	¥11,560	-32.6%	¥19M ($120K)
2026-04-06	BUY	Market Buy	野村證券株式会社	other	152.1K	¥8,430	-7.6%	¥1.3B ($8.1M)
2026-04-06	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	181.3K	¥8,430	+7.6%	¥1.1B ($6.8M)
2026-04-06	BUY	Market Buy	野村アセットマネジメント株式会社	other	497.4K	¥8,430	-	-
2026-04-03	SELL	unknown	SBIアセットマネジメント株式会社	passive	227.0K	¥8,270	+5.8%	¥1.3B ($8.3M)
2026-04-03	SELL	unknown	株式会社SBI証券	other	20.2K	¥8,270	+5.8%	¥100M ($644K)
2026-03-31	BUY	Market Buy	野村證券株式会社	other	2.1K	¥8,150	-4.4%	¥20M ($127K)
2026-03-31	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	306.6K	¥8,150	-4.4%	¥1.1B ($6.9M)
2026-03-31	BUY	Market Buy	野村アセットマネジメント株式会社	other	496.9K	¥8,150	-4.4%	¥7M ($42K)
2026-03-17	SELL	unknown	野村證券株式会社	other	-37	¥7,210	-32.5%	¥353K ($2K)
2026-03-17	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	174.6K	¥7,210	+8.0%	¥1.1B ($7.3M)
2026-03-17	BUY	unknown	野村アセットマネジメント株式会社	other	495.9K	¥7,210	+8.0%	¥6M ($37K)
2025-12-19	SELL	Market Buy	野村證券株式会社	other	1.3K	¥3,810	-104.5%	¥43M ($277K)
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	18.2K	¥3,810	-	¥69M ($448K)
2025-12-19	SELL	Market Buy	野村アセットマネジメント株式会社	other	495.6K	¥3,810	-104.5%	¥9M ($59K)
2025-07-22	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	2.4K	¥2,923	+166.5%	¥599M ($3.9M)
2025-07-22	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	498.0K	¥2,923	+166.5%	¥56M ($364K)
2025-07-22	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	12.8K	¥2,923	+166.5%	¥3.5B ($22.8M)
2025-02-07	BUY	Market Buy	SBIアセットマネジメント株式会社 SBI Asset Management Co., Ltd.	passive	382.0K	¥2,999	+159.8%	¥1.1B ($7.4M)
2025-02-07	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	32.2K	¥2,999	+159.8%	¥97M ($624K)
2024-11-20	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	478.2K	¥2,929	+166.0%	¥212M ($1.4M)
2024-11-20	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	516	¥2,929	-166.0%	¥18.4B ($118.5M)
2024-11-20	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	36.1K	¥2,929	-166.0%	¥146M ($942K)
2024-10-18	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	63.2K	¥3,405	-128.8%	¥238M ($1.5M)
2024-10-18	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	86.4K	¥3,405	+128.8%	¥241M ($1.6M)
2024-10-18	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	406.3K	¥3,405	-128.8%	¥3M ($18K)
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	15.4K	¥3,445	-126.1%	¥288M ($1.9M)
2024-08-07	SELL	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	133.3K	¥3,445	-126.1%	¥94M ($608K)
2024-08-07	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	407.1K	¥3,445	-	-
2024-07-18	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.5K	¥4,490	+73.5%	¥361M ($2.3M)
2024-07-18	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	99.0K	¥4,490	+73.5%	¥343M ($2.2M)
2024-07-18	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	406.9K	¥4,490	-73.5%	¥372M ($2.4M)
2024-07-04	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.0K	¥4,135	-	¥4M ($27K)
2024-07-04	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	22.2K	¥4,135	+88.4%	¥50M ($322K)
2024-07-04	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	489.9K	¥4,135	-88.4%	¥17M ($107K)
2023-11-08	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	10.2K	¥4,345	-79.3%	¥234M ($1.5M)

Showing the 50 most recent of 76 filings.

Frequently asked questions

Who has been buying SAMCO Inc. stock?: 12 distinct investors have filed 33 disclosed large-shareholding filings in SAMCO Inc. (6387), most recently on 2026-05-07. 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 SAMCO Inc. have?: SAMCO Inc. has 33 buy-side and 24 sell-side disclosures on record, covering ¥9.8B ($63.4M) in total reported value, spanning 2021-03-18 to 2026-05-07.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.