Who has been buying Aucnet Inc. stock?

9 distinct investors have filed 16 disclosed large-shareholding filings in Aucnet Inc. (3964), most recently on 2026-03-31. 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 Aucnet Inc. have?

Aucnet Inc. has 16 buy-side and 15 sell-side disclosures on record, covering ¥2.7B ($17.4M) in total reported value, spanning 2021-04-22 to 2026-03-31.

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.

Aucnet Inc. 3964

Company

株式会社オークネットAucnet Inc.

Investors

Buys

Total Value

¥2.7B ($17.4M)

Avg Return

+130.52%

Last Filing

2026-03-31

Aucnet Inc. (3964) has 16 disclosed large-shareholding filings and 15 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥2.7B ($17.4M) in reported transaction value. The earliest filing StockDrifts holds for Aucnet Inc. is dated 2021-04-22; the most recent is 2026-03-31. Across these filings the average return since disclosure is +130.52%, 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
2026-08-21	BUY	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	1.5M	¥1,427	-	-
2026-08-21	SELL	unknown	エフアイエーエムエルエルシー FIAM LLC	other	1.0M	¥1,427	+4.2%	¥69M ($442K)
2026-08-21	BUY	unknown	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	155.8K	¥1,427	-	-
2026-08-21	SELL	unknown	エフエムアールインベストメントマネジメントユーケーリミテッドLimited) FMR Investment Management (UK	other	1.9M	¥1,427	+4.2%	¥1.5B ($9.4M)
2026-08-21	SELL	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	7.7M	¥1,427	+4.2%	¥1.6B ($10.1M)
2026-07-23	BUY	Market Buy	エフアイエーエムエルエルシー FIAM LLC	other	1.1M	¥1,401	-2.4%	¥242M ($1.6M)
2026-07-23	BUY	Market Buy	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	155.8K	¥1,401	-2.4%	¥27M ($174K)
2026-07-23	BUY	unknown	エフエムアールインベストメントマネジメントユーケーリミテッドLimited) FMR Investment Management (UK	other	2.9M	¥1,401	-	¥4.1B ($26.5M)
2026-07-23	SELL	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	1.5M	¥1,401	+2.4%	¥5.5B ($35.2M)
2026-06-10	BUY	Market Buy	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	1.4M	¥1,437	-4.9%	¥153M ($987K)
2026-06-10	BUY	Market Buy	エフアイエーエムエルエルシー FIAM LLC	other	238.4K	¥1,437	-4.9%	¥210M ($1.4M)
2026-06-10	BUY	Market Buy	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	34.3K	¥1,437	-4.9%	¥11M ($69K)
2026-06-08	BUY	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	1.3M	¥1,377	-0.7%	¥1.8B ($11.5M)
2026-06-08	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	92.6K	¥1,377	-0.7%	¥128M ($823K)
2026-06-08	BUY	unknown	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	28.3K	¥1,377	-0.7%	¥39M ($251K)
2026-03-31	BUY	Market Buy	株式会社Blue Peak	strategic	4.8M	¥1,188	+15.1%	¥171M ($1.1M)
2026-03-31	BUY	Market Buy	藤崎真弘	activist	509.7K	¥1,188	+15.1%	¥11M ($74K)
2026-03-24	SELL	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	4.4M	¥1,196.5	-14.3%	¥575M ($3.7M)
2025-08-06	SELL	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	5.0M	¥881.5	-55.1%	¥437M ($2.8M)
2025-02-26	SELL	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	2.8M	¥594.75	-129.8%	¥433M ($2.8M)
2024-11-27	BUY	unknown	株式会社Blue Peak Corporation Blue Peak	strategic	2.4M	¥645.5	+111.8%	¥1.6B ($10.1M)
2024-11-27	SELL	unknown	フレックスコーポレーション株式会社 FLEX Corporation	strategic	9.4M	¥645.5	-111.8%	¥1.2B ($7.8M)
2024-11-27	BUY	unknown	藤崎真弘 Masahiro Fujisaki	activist	257.2K	¥645.5	+111.8%	¥166M ($1.1M)
2024-08-28	BUY	unknown	フレックスコーポレーション株式会社 FLEX Corporation	strategic	11.2M	¥592.75	-	-
2024-05-22	BUY	Market Buy	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	1.7M	¥639	+113.9%	¥165M ($1.1M)
2024-05-22	BUY	Market Buy	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	1.7M	¥639	+113.9%	¥165M ($1.1M)
2024-02-07	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	1.4M	¥531.75	+157.1%	¥750M ($4.8M)
2024-02-07	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	1.4M	¥531.75	+157.1%	¥750M ($4.8M)
2024-01-11	SELL	unknown	ユナイテッド・マネージャーズ・ジャパン株式会社 United Managers Japan Inc.	unknown	0	¥483.75	-182.6%	¥659M ($4.3M)
2024-01-11	BUY	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	3.5M	¥483.75	+182.6%	¥972M ($6.3M)
2023-12-25	BUY	Market Buy	フレックスコーポレーション株式会社 FLEX Corporation	strategic	11.2M	¥451	+203.1%	¥795M ($5.1M)
2023-07-05	BUY	unknown	藤崎清孝 Kiyotaka Fujisaki	activist	614.4K	¥436.75	+213.0%	¥1M ($7K)
2023-07-05	SELL	unknown	株式会社ナマイ・アセットマネジメント NAMAI ASSET MANAGEMENT	strategic	500.0K	¥436.75	-213.0%	¥153M ($984K)
2023-07-05	SELL	unknown	株式会社オリエントコーポレーション Orient Corporation	strategic	1.3M	¥436.75	-213.0%	¥565M ($3.6M)
2023-06-13	BUY	Market Buy	株式会社ナマイ・アセットマネジメント NAMAI ASSET MANAGEMENT	strategic	850.0K	¥419.75	+225.7%	¥19M ($122K)
2023-06-13	BUY	Market Buy	株式会社オリエントコーポレーション Orient Corporation	strategic	2.6M	¥419.75	+225.7%	¥40M ($258K)
2023-06-13	BUY	Market Buy	藤崎清孝 Kiyotaka Fujisaki	activist	611.8K	¥419.75	-	-
2023-01-18	BUY	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	1.6M	¥440.5	+210.3%	¥118M ($760K)
2022-11-21	BUY	Market Buy	ユナイテッド・マネージャーズ・ジャパン株式会社 United Managers Japan Inc.	activist	1.5M	¥465.25	+193.8%	¥60M ($386K)
2022-10-11	BUY	unknown	株式会社ナマイ・アセットマネジメント NAMAI ASSET MANAGEMENT	strategic	850.0K	¥557.75	+145.1%	¥464M ($3.0M)
2022-10-11	SELL	unknown	フレックスコーポレーション株式会社 FLEX Corporation	strategic	10.7M	¥557.75	-145.1%	¥279M ($1.8M)
2022-10-11	BUY	unknown	藤崎清孝 Kiyotaka Fujisaki	activist	646.6K	¥557.75	-	-
2022-09-14	SELL	unknown	フレックスコーポレーション株式会社 FLEX Corporation	strategic	11.2M	¥563.5	-142.6%	¥2M ($10K)
2022-09-14	SELL	unknown	株式会社ナマイ・アセットマネジメント NAMAI ASSET MANAGEMENT	strategic	1.9M	¥563.5	-142.6%	¥65M ($417K)
2022-09-14	SELL	unknown	藤崎清孝 Kiyotaka Fujisaki	activist	646.6K	¥563.5	-142.6%	¥36M ($234K)
2021-12-01	BUY	Market Buy	ユナイテッド・マネージャーズ・ジャパン株式会社 United Managers Japan Inc.	activist	1.4M	¥429	+218.7%	¥604M ($3.9M)
2021-11-22	BUY	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	1.4M	¥454.5	+200.8%	¥635M ($4.1M)
2021-08-20	BUY	unknown	フレックスコーポレーション株式会社 FLEX Corporation	strategic	11.2M	¥467.5	-	¥193M ($1.2M)
2021-08-20	SELL	unknown	フレックスコーポレーション株式会社 FLEX Corporation	strategic	11.2M	¥467.5	-192.4%	¥193M ($1.2M)
2021-06-22	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	1.2M	¥354.75	-285.3%	¥127M ($818K)

Showing the 50 most recent of 52 filings.

Frequently asked questions

Who has been buying Aucnet Inc. stock?: 9 distinct investors have filed 16 disclosed large-shareholding filings in Aucnet Inc. (3964), most recently on 2026-03-31. 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 Aucnet Inc. have?: Aucnet Inc. has 16 buy-side and 15 sell-side disclosures on record, covering ¥2.7B ($17.4M) in total reported value, spanning 2021-04-22 to 2026-03-31.
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.