Who has been buying Naigai Co.,Ltd. stock?

10 distinct investors have filed 8 disclosed large-shareholding filings in Naigai Co.,Ltd. (8013), 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 Naigai Co.,Ltd. have?

Naigai Co.,Ltd. has 8 buy-side and 8 sell-side disclosures on record, covering ¥141M ($911K) in total reported value, spanning 2021-11-22 to 2026-03-31.

Where does StockDrifts get Naigai Co.,Ltd. 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.

Naigai Co.,Ltd. 8013

Company

株式会社ナイガイNaigai Co.,Ltd.

Investors

Buys

Total Value

¥141M ($911K)

Avg Return

+7.82%

Last Filing

2026-03-31

Naigai Co.,Ltd. (8013) has 8 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥141M ($911K) in reported transaction value. The earliest filing StockDrifts holds for Naigai Co.,Ltd. is dated 2021-11-22; the most recent is 2026-03-31. 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 +7.82%, 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
2026-07-28	BUY	Market Buy	重田光時 Mitsutoki Shigeta	activist	783.8K	¥374	-5.9%	¥31M ($200K)
2026-05-29	BUY	Market Buy	重田光時 Mitsutoki Shigeta	activist	700.8K	¥378	-10.1%	¥31M ($202K)
2026-03-31	BUY	Market Buy	重田光時 Mitsutoki Shigeta	passive	618.3K	¥294	+9.2%	¥24M ($157K)
2026-03-05	BUY	unknown	タビオ株式会社 Tabio	strategic	908.5K	¥293	+5.1%	¥266M ($1.7M)
2025-12-24	BUY	Market Buy	重田光時 Mitsutoki Shigeta	passive	534.9K	¥277	+11.2%	¥23M ($150K)
2025-12-19	BUY	Market Buy	タビオ株式会社 Tabio	strategic	908.5K	¥276	+11.6%	¥29M ($184K)
2025-09-24	SELL	Market Buy	重田光時 Mitsutoki Shigeta	passive	494.1K	¥340	+9.4%	¥39M ($251K)
2025-09-24	BUY	Market Buy	重田光時 Mitsutoki Shigeta	passive	450.9K	¥340	-9.4%	¥53M ($344K)
2025-06-24	BUY	Market Buy	重田光時 Mitsutoki Shigeta	passive	608.1K	¥289	+6.6%	¥25M ($159K)
2024-05-08	BUY	Market Buy	エフィッシモキャピタルマネージメントピーティーイーエルティーディー(Effissimo Capital Management Pte. Ltd.) Effissimo Capital Management Pte. Ltd.	passive	490.9K	¥259	+18.9%	¥127M ($820K)
2023-11-08	BUY	acquisition	タビオ株式会社 Tabio	strategic	805.4K	¥268	+14.9%	¥216M ($1.4M)
2023-11-08	BUY	unknown	タビオ株式会社 Tabio	strategic	805.4K	¥268	+14.9%	¥216M ($1.4M)
2023-11-08	BUY	unknown	タビオ株式会社 Tabio	strategic	805.4K	¥268	+14.9%	¥216M ($1.4M)
2023-10-19	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	62.7K	¥282	-9.2%	¥6M ($36K)
2023-10-19	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	200.0K	¥282	+9.2%	¥56M ($364K)
2023-10-19	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	119.3K	¥282	-9.2%	¥18M ($117K)
2023-08-22	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	366.1K	¥279	+10.4%	¥102M ($659K)
2023-08-22	BUY	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	3.6K	¥279	+10.4%	¥54M ($346K)
2023-02-21	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	81.8K	¥260	-18.5%	¥4M ($23K)
2023-02-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	200.0K	¥260	+18.5%	¥52M ($335K)
2023-02-21	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	182.9K	¥260	-18.5%	¥6M ($37K)
2022-01-11	SELL	unknown	日鉄物産株式会社 NIPPON STEEL TRADING CORPORATION	unknown	0	¥301	-2.3%	¥245M ($1.6M)
2021-12-21	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	96.1K	¥306	-0.7%	¥754K ($5K)
2021-12-21	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	200.0K	¥306	+0.7%	¥61M ($395K)
2021-12-21	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	205.2K	¥306	-0.7%	¥754K ($5K)
2021-12-15	BUY	Market Buy	重田光時 Mitsutoki Shigeta	passive	522.7K	¥311	-1.0%	¥7M ($43K)
2021-12-15	BUY	Market Buy	株式会社鹿児島東インド会社 Kagoshima East India Inc	passive	1.0K	¥311	-1.0%	¥311K ($2K)
2021-11-22	BUY	Market Buy	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	136.6K	¥309	-0.3%	¥28M ($180K)
2021-11-22	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	366.1K	¥309	-0.3%	¥113M ($730K)

Frequently asked questions

Who has been buying Naigai Co.,Ltd. stock?: 10 distinct investors have filed 8 disclosed large-shareholding filings in Naigai Co.,Ltd. (8013), 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 Naigai Co.,Ltd. have?: Naigai Co.,Ltd. has 8 buy-side and 8 sell-side disclosures on record, covering ¥141M ($911K) in total reported value, spanning 2021-11-22 to 2026-03-31.
Where does StockDrifts get Naigai Co.,Ltd. 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 Naigai Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.