Who has been buying Vector Inc. stock?

6 distinct investors have filed 7 disclosed large-shareholding filings in Vector Inc. (6058), most recently on 2026-03-23. 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 Vector Inc. have?

Vector Inc. has 7 buy-side and 9 sell-side disclosures on record, covering ¥16.5B ($106.4M) in total reported value, spanning 2021-06-01 to 2026-03-23.

Where does StockDrifts get Vector 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.

Vector Inc. 6058

Company

株式会社ベクトルVector Inc.

Investors

Buys

Total Value

¥16.5B ($106.4M)

Avg Return

+6.21%

Last Filing

2026-03-23

Vector Inc. (6058) has 7 disclosed large-shareholding filings and 9 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥16.5B ($106.4M) in reported transaction value. The earliest filing StockDrifts holds for Vector Inc. is dated 2021-06-01; the most recent is 2026-03-23. 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 +6.21%, 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
2026-06-12	BUY	unknown	西江肇司 Keiji Nishie	activist	5.7M	¥1,472	+31.1%	¥8.4B ($54.3M)
2026-06-12	BUY	unknown	西江肇司 Keiji Nishie	activist	5.7M	¥1,472	+31.1%	¥8.4B ($54.3M)
2026-03-23	SELL	unknown	ベイリー・ギフォード・アンド・カンパニー(Baillie Gifford & Co) Baillie Gifford & Co	other	2.5M	¥1,215	+1.8%	¥593M ($3.8M)
2026-01-06	BUY	Market Buy	株式会社フリーウェイ Freeway Inc.	other	13.1M	¥1,263	-5.5%	¥1.7B ($11.3M)
2026-01-06	BUY	unknown	株式会社フリーウェイ Freeway Inc.	other	11.7M	¥1,263	-5.5%	¥14.8B ($95.5M)
2026-01-06	BUY	unknown	株式会社フリーウェイ Freeway Inc.	other	11.7M	¥1,263	-5.5%	¥14.8B ($95.5M)
2026-01-06	BUY	acquisition	株式会社フリーウェイ Freeway Inc.	other	11.7M	¥1,263	-5.5%	¥14.8B ($95.5M)
2026-01-05	SELL	unknown	西江肇司 Keiji Nishie	activist	5.7M	¥1,195	+0.2%	¥1.6B ($10.6M)
2026-01-05	SELL	unknown	西江肇司 Keiji Nishie	activist	7.1M	¥1,195	+0.2%	¥14.0B ($90.4M)
2025-09-08	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥1,149	+3.8%	¥21.6B ($139.5M)
2025-09-02	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥1,137	+4.9%	¥21.4B ($138.1M)
2025-04-25	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥883	+35.1%	¥16.6B ($107.2M)
2025-03-05	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥925	+29.0%	¥17.4B ($112.3M)
2025-02-27	SELL	unknown	メロン・インベストメンツ・コーポレーション Mellon Investments Corporation	other	48.9K	¥936	-27.5%	¥4M ($28K)
2025-02-27	SELL	unknown	ニュートン・インベストメント・マネジメント・ジャパン株式会社 Newton Investment Management Japan Ltd.	other	1.7M	¥936	-27.5%	¥672M ($4.3M)
2025-02-25	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥963	+23.9%	¥18.1B ($116.9M)
2025-02-17	BUY	unknown	メロン・インベストメンツ・コーポレーション Mellon Investments Corporation	other	49.4K	¥989	+20.6%	¥51M ($329K)
2025-02-17	SELL	unknown	ニュートン・インベストメント・マネジメント・ジャパン株式会社 Newton Investment Management Japan Ltd.	other	2.4M	¥989	-20.6%	¥766M ($4.9M)
2025-02-03	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥1,030	+15.8%	¥19.4B ($125.1M)
2025-01-08	BUY	Market Buy	ベイリー・ギフォード・アンド・カンパニー(Baillie Gifford & Co) Baillie Gifford & Co	other	3.0M	¥1,011	+18.0%	¥498M ($3.2M)
2025-01-07	BUY	Market Buy	西江肇司 Keiji Nishie	activist	18.8M	¥1,019	+17.1%	¥502M ($3.2M)
2024-05-16	SELL	unknown	ニュートン・インベストメント・マネジメント・ジャパン株式会社 Newton Investment Management Japan Ltd.	other	3.2M	¥1,339	+10.9%	¥666M ($4.3M)
2024-05-09	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー(Baillie Gifford & Co) Baillie Gifford & Co	other	2.5M	¥1,299	-8.2%	¥3.2B ($20.6M)
2023-12-08	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥1,049	+13.7%	¥19.7B ($127.4M)
2023-12-07	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥1,048	+13.8%	¥19.7B ($127.0M)
2023-12-07	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥1,048	+13.8%	¥56M ($358K)
2023-05-29	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥1,307	-8.7%	¥24.5B ($158.4M)
2023-03-17	BUY	unknown	ニュートン・インベストメント・マネジメント・ジャパン株式会社 Newton Investment Management Japan Ltd.	other	3.8M	¥1,431	-16.6%	¥5.4B ($34.9M)
2023-03-17	SELL	unknown	BNYメロン・インベストメント・マネジメント・ジャパン株式会社 BNY Mellon Investment Management Japan Limited	other	0	¥1,431	+16.6%	¥5.2B ($33.4M)
2022-10-13	BUY	Market Buy	BNYメロン・インベストメント・マネジメント・ジャパン株式会社 BNY Mellon Investment Management Japan Limited	other	3.6M	¥1,115	+7.0%	¥625M ($4.0M)
2022-08-10	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥1,266	-5.8%	¥23.8B ($153.4M)
2022-06-07	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥1,048	+13.8%	¥19.7B ($127.0M)
2022-02-16	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥1,071	+11.4%	¥20.1B ($129.8M)
2022-02-15	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥1,061	+12.4%	¥19.9B ($128.6M)
2022-02-08	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥1,050	+13.6%	¥19.7B ($127.2M)
2021-08-17	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥925	+29.0%	¥17.4B ($112.1M)
2021-07-02	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥978	+22.0%	¥18.4B ($118.5M)
2021-06-16	SELL	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥957	-24.7%	¥954M ($6.2M)
2021-06-01	BUY	unknown	西江肇司 Keiji Nishie	activist	20.5M	¥905	+31.8%	¥18.5B ($119.6M)
2021-06-01	BUY	unknown	西江肇司 Keiji Nishie	activist	18.8M	¥905	+31.8%	¥17.0B ($109.7M)

Frequently asked questions

Who has been buying Vector Inc. stock?: 6 distinct investors have filed 7 disclosed large-shareholding filings in Vector Inc. (6058), most recently on 2026-03-23. 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 Vector Inc. have?: Vector Inc. has 7 buy-side and 9 sell-side disclosures on record, covering ¥16.5B ($106.4M) in total reported value, spanning 2021-06-01 to 2026-03-23.
Where does StockDrifts get Vector 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 Vector Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.