Who has been buying Port Inc. stock?

6 distinct investors have filed 18 disclosed large-shareholding filings in Port Inc. (7047), most recently on 2026-01-21. 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 Port Inc. have?

Port Inc. has 18 buy-side and 15 sell-side disclosures on record, covering ¥32.6B ($210.5M) in total reported value, spanning 2021-04-14 to 2026-01-21.

Where does StockDrifts get Port 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.

Port Inc. 7047

Company

ポート株式会社Port Inc.

Investors

Buys

Total Value

¥32.6B ($210.5M)

Avg Return

+88.64%

Last Filing

2026-01-21

Port Inc. (7047) has 18 disclosed large-shareholding filings and 15 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥32.6B ($210.5M) in reported transaction value. The earliest filing StockDrifts holds for Port Inc. is dated 2021-04-14; the most recent is 2026-01-21. 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 +88.64%, 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
2026-01-21	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	708.3K	¥2,187	+12.5%	¥1.5B ($10.0M)
2025-12-04	SELL	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	598.1K	¥2,166	-13.6%	¥376M ($2.4M)
2025-09-04	SELL	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	770.3K	¥2,173	-13.3%	¥413M ($2.7M)
2025-06-05	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	959.0K	¥1,614	+52.5%	¥227M ($1.5M)
2025-05-08	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	817.0K	¥1,928	+27.6%	¥1.6B ($10.2M)
2024-11-08	BUY	unknown	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	697.1K	¥1,843	+33.5%	¥1.3B ($8.2M)
2024-11-08	SELL	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	0	¥1,843	-33.5%	¥345M ($2.2M)
2024-09-18	BUY	unknown	ゲーム株式会社 Game Co., Ltd.	activist	41.0K	¥1,939	+26.9%	¥2.4B ($15.7M)
2024-09-18	SELL	unknown	春日博文 Hirofumi Kasuga	activist	4.7M	¥1,939	-26.9%	¥5M ($35K)
2024-09-06	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	187.2K	¥1,972	+24.8%	¥190M ($1.2M)
2024-09-06	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	704.3K	¥1,972	+24.8%	¥127M ($818K)
2024-08-07	BUY	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	90.6K	¥1,563	+57.5%	¥142M ($914K)
2024-08-07	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	639.9K	¥1,563	+57.5%	¥1.0B ($6.5M)
2024-06-05	SELL	unknown	ゲーム株式会社 Game Co., Ltd.	activist	28.0K	¥2,230	-10.4%	¥623M ($4.0M)
2024-06-05	BUY	unknown	春日博文 Hirofumi Kasuga	activist	4.7M	¥2,230	+10.4%	¥10.1B ($65.5M)
2024-05-08	SELL	unknown	丸山侑佑 Yusuke Maruyama	activist	683.2K	¥2,053	-19.9%	¥80M ($518K)
2024-05-08	BUY	unknown	丸山侑佑 Yusuke Maruyama	activist	683.2K	¥2,053	+19.9%	¥80M ($518K)
2023-10-02	BUY	unknown	ゲーム株式会社 Game Co., Ltd.	activist	28.0K	¥2,181	+12.8%	¥61M ($394K)
2023-10-02	SELL	unknown	春日博文 Hirofumi Kasuga	activist	4.7M	¥2,181	-12.8%	¥11M ($71K)
2023-06-13	BUY	unknown	ゲーム株式会社 Game Co., Ltd.	activist	28.0K	¥1,824	+34.9%	¥4.9B ($31.8M)
2023-06-13	BUY	unknown	春日博文 Hirofumi Kasuga	activist	4.7M	¥1,824	+34.9%	¥8.3B ($53.6M)
2022-11-22	SELL	unknown	丸山侑佑 Yusuke Maruyama	activist	632.4K	¥1,160	-112.2%	¥142M ($915K)
2022-08-23	SELL	Market Buy	志野文哉 Shino Fumiya	passive	391.9K	¥1,002	-145.6%	¥565M ($3.6M)
2022-06-27	BUY	Market Buy	丸山侑佑 Yusuke Maruyama	activist	753.7K	¥748	+229.0%	¥18M ($116K)
2022-06-10	SELL	unknown	ゲーム株式会社 Game Co., Ltd.	activist	70.2K	¥742	-231.7%	¥3.0B ($19.3M)
2022-06-10	SELL	unknown	ゲーム株式会社 Game Co., Ltd.	activist	70.2K	¥742	-231.7%	¥3.0B ($19.3M)
2022-06-10	SELL	unknown	春日博文 Hirofumi Kasuga	activist	4.7M	¥742	-231.7%	¥21M ($133K)
2022-06-10	SELL	unknown	春日博文 Hirofumi Kasuga	activist	4.7M	¥742	-231.7%	¥21M ($133K)
2022-03-24	SELL	Market Buy	志野文哉 Shino Fumiya	passive	1.1M	¥825	-198.3%	¥25M ($160K)
2022-03-24	SELL	Market Buy	志野文哉 Shino Fumiya	passive	955.2K	¥825	-198.3%	¥94M ($609K)
2021-09-08	BUY	Market Buy	ゲーム株式会社 Game Co., Ltd.	activist	42.2K	¥852	+188.8%	¥36M ($232K)
2021-09-08	BUY	Market Buy	春日博文 Hirofumi Kasuga	activist	4.7M	¥852	+188.8%	¥27M ($174K)
2021-09-03	BUY	unknown	ゲーム株式会社 Game Co., Ltd.	activist	42.2K	¥862	+185.5%	¥36M ($235K)
2021-09-03	BUY	unknown	ゲーム株式会社 Game Co., Ltd.	activist	42.2K	¥862	+185.5%	¥36M ($235K)
2021-09-03	BUY	unknown	春日博文 Hirofumi Kasuga	activist	4.7M	¥862	+185.5%	¥3.8B ($24.5M)
2021-09-03	BUY	unknown	春日博文 Hirofumi Kasuga	activist	4.7M	¥862	+185.5%	¥3.8B ($24.5M)
2021-06-30	BUY	Market Buy	志野文哉 Shino Fumiya	passive	1.1M	¥779	+215.9%	¥101M ($653K)
2021-04-14	BUY	Market Buy	志野文哉 Shino Fumiya	passive	938.6K	¥840	+193.0%	¥135M ($868K)

Frequently asked questions

Who has been buying Port Inc. stock?: 6 distinct investors have filed 18 disclosed large-shareholding filings in Port Inc. (7047), most recently on 2026-01-21. 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 Port Inc. have?: Port Inc. has 18 buy-side and 15 sell-side disclosures on record, covering ¥32.6B ($210.5M) in total reported value, spanning 2021-04-14 to 2026-01-21.
Where does StockDrifts get Port 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 Port Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.