Who has been buying Prime Strategy Co., Ltd. stock?

3 distinct investors have filed 3 disclosed large-shareholding filings in Prime Strategy Co., Ltd. (5250), most recently on 2026-01-14. 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 Prime Strategy Co., Ltd. have?

Prime Strategy Co., Ltd. has 3 buy-side and 10 sell-side disclosures on record, covering ¥4.6B ($29.5M) in total reported value, spanning 2023-02-28 to 2026-01-14.

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.

Prime Strategy Co., Ltd. 5250

Company

プライム・ストラテジー株式会社Prime Strategy Co., Ltd.

Investors

Buys

Total Value

¥4.6B ($29.5M)

Avg Return

-43.98%

Last Filing

2026-01-14

Prime Strategy Co., Ltd. (5250) has 3 disclosed large-shareholding filings and 10 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥4.6B ($29.5M) in reported transaction value. The earliest filing StockDrifts holds for Prime Strategy Co., Ltd. is dated 2023-02-28; the most recent is 2026-01-14. Across these filings the average return since disclosure is -43.98%, 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
2026-01-14	BUY	unknown	中村けん牛	strategic	290.7K	¥1,244	-	-
2026-01-14	BUY	unknown	中村八千代	strategic	24.7K	¥1,244	-	-
2026-01-14	BUY	unknown	中村けん牛	strategic	290.7K	¥1,244	-	-
2026-01-14	BUY	unknown	中村八千代	strategic	24.7K	¥1,244	-	-
2025-12-26	SELL	unknown	中村けん牛	strategic	290.7K	¥1,175	-1.2%	¥1.4B ($8.8M)
2025-12-26	SELL	unknown	中村けん牛	strategic	290.7K	¥1,175	-1.2%	¥1.4B ($8.8M)
2025-12-26	SELL	unknown	中村八千代	strategic	24.7K	¥1,175	-1.2%	¥730M ($4.7M)
2025-12-26	SELL	unknown	中村八千代	strategic	24.7K	¥1,175	-1.2%	¥730M ($4.7M)
2025-12-24	BUY	acquisition	GMOインターネットグループ株式会社 GMO internet group, Inc.	activist	2.2M	¥1,206	-1.4%	¥2.7B ($17.2M)
2025-12-01	SELL	unknown	中村八千代	strategic	646.4K	¥1,519	+21.7%	¥2M ($14K)
2025-12-01	SELL	unknown	中村けん牛	strategic	1.4M	¥1,519	+21.7%	¥5M ($31K)
2025-07-11	SELL	unknown	中村八千代 Yachiyo Nakamura	strategic	646.4K	¥1,200	+0.9%	¥9M ($60K)
2025-07-11	SELL	unknown	中村けん牛 Kengyu Nakamura	strategic	1.4M	¥1,200	+0.9%	¥22M ($140K)
2024-11-08	BUY	unknown	中村けん牛 Kengyu Nakamura	strategic	1.4M	¥1,080	-	-
2024-11-08	BUY	unknown	中村八千代 Yachiyo Nakamura	strategic	646.4K	¥1,080	-	-
2024-09-27	SELL	unknown	中村八千代 Yachiyo Nakamura	strategic	646.4K	¥1,227	+3.1%	¥45M ($291K)
2024-09-27	SELL	unknown	中村けん牛 Kengyu Nakamura	strategic	1.4M	¥1,227	+3.1%	¥100M ($646K)
2023-02-28	BUY	unknown	中村八千代 Yachiyo Nakamura	strategic	646.4K	¥2,950	-59.7%	¥1.9B ($12.3M)
2023-02-28	BUY	unknown	中村けん牛 Kengyu Nakamura	activist	1.4M	¥2,950	-59.7%	¥4.3B ($27.6M)

Frequently asked questions

Who has been buying Prime Strategy Co., Ltd. stock?: 3 distinct investors have filed 3 disclosed large-shareholding filings in Prime Strategy Co., Ltd. (5250), most recently on 2026-01-14. 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 Prime Strategy Co., Ltd. have?: Prime Strategy Co., Ltd. has 3 buy-side and 10 sell-side disclosures on record, covering ¥4.6B ($29.5M) in total reported value, spanning 2023-02-28 to 2026-01-14.
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.