Who has been buying Carta Holdings, Inc. stock?

8 distinct investors have filed 11 disclosed large-shareholding filings in Carta Holdings, Inc. (3688), most recently on 2025-10-06. 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 Carta Holdings, Inc. have?

Carta Holdings, Inc. has 11 buy-side and 5 sell-side disclosures on record, covering ¥29.3B ($188.8M) in total reported value, spanning 2021-09-22 to 2025-10-06.

Where does StockDrifts get Carta Holdings, 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.

Carta Holdings, Inc. 3688

Company

株式会社CARTA HOLDINGSCarta Holdings, Inc.

Investors

Buys

Total Value

¥29.3B ($188.8M)

Avg Return

+0.09%

Last Filing

2025-10-06

Carta Holdings, Inc. (3688) has 11 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥29.3B ($188.8M) in reported transaction value. The earliest filing StockDrifts holds for Carta Holdings, Inc. is dated 2021-09-22; the most recent is 2025-10-06. 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 +0.09%, 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
2025-10-06	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	116.4K	¥2,089	+0.1%	¥236M ($1.5M)
2025-10-06	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	168.6K	¥2,089	+0.1%	¥329M ($2.1M)
2025-10-06	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	2.0K	¥2,089	-0.1%	¥21M ($136K)
2025-09-22	BUY	unknown	合同会社533 LLC 533	activist	100.0K	¥2,085	+0.3%	¥209M ($1.3M)
2025-09-22	BUY	unknown	合同会社533 LLC 533	activist	100.0K	¥2,085	+0.3%	¥209M ($1.3M)
2025-09-22	SELL	unknown	宇佐美進典 Shinnori Usami	activist	1.9M	¥2,085	-0.3%	¥390M ($2.5M)
2025-09-22	SELL	unknown	合同会社533 LLC 533	unknown	0	¥2,085	-0.3%	¥21.1B ($136.1M)
2025-09-22	SELL	unknown	宇佐美進典 Shinnori Usami	unknown	0	¥2,085	-0.3%	¥3.9B ($25.2M)
2025-09-22	BUY	unknown	宇佐美進典 Shinnori Usami	activist	1.9M	¥2,085	+0.3%	¥3.9B ($25.2M)
2025-09-19	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	348.1K	¥2,086	+0.2%	¥5M ($34K)
2025-09-19	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	1.2M	¥2,086	+0.2%	¥734M ($4.7M)
2025-09-19	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	262.0K	¥2,086	+0.2%	¥16M ($102K)
2025-09-17	BUY	acquisition	株式会社電通グループ DENTSU GROUP INC.	activist	13.4M	¥2,088	+0.1%	¥28.1B ($181.1M)
2025-09-17	BUY	acquisition	株式会社NTTドコモ NTT DOCOMO, INC.	activist	9.6M	¥2,088	+0.1%	¥20.0B ($129.0M)
2025-09-05	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	346.6K	¥2,096	-0.2%	¥726M ($4.7M)
2025-09-05	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	843.2K	¥2,096	-0.2%	¥1.8B ($11.4M)
2025-09-05	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	255.7K	¥2,096	-0.2%	¥536M ($3.5M)
2025-06-27	BUY	Market Buy	株式会社電通グループ DENTSU GROUP INC.	activist	13.4M	¥2,081	+0.5%	¥126M ($815K)
2021-09-22	SELL	unknown	りそなアセットマネジメント株式会社 Resona Asset Management Co.,Ltd.	other	947.3K	¥2,591	+19.3%	¥1.2B ($7.5M)

Frequently asked questions

Who has been buying Carta Holdings, Inc. stock?: 8 distinct investors have filed 11 disclosed large-shareholding filings in Carta Holdings, Inc. (3688), most recently on 2025-10-06. 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 Carta Holdings, Inc. have?: Carta Holdings, Inc. has 11 buy-side and 5 sell-side disclosures on record, covering ¥29.3B ($188.8M) in total reported value, spanning 2021-09-22 to 2025-10-06.
Where does StockDrifts get Carta Holdings, 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 Carta Holdings, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.