Who has been buying BPLATS,Inc. stock?

5 distinct investors have filed 6 disclosed large-shareholding filings in BPLATS,Inc. (4381), most recently on 2026-04-02. 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 BPLATS,Inc. have?

BPLATS,Inc. has 6 buy-side and 26 sell-side disclosures on record, covering ¥559M ($3.6M) in total reported value, spanning 2023-07-24 to 2026-04-02.

Where does StockDrifts get BPLATS,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.

BPLATS,Inc. 4381

Company

ビープラッツ株式会社BPLATS,Inc.

Investors

Buys

Total Value

¥559M ($3.6M)

Avg Return

-47.47%

Last Filing

2026-04-02

BPLATS,Inc. (4381) has 6 disclosed large-shareholding filings and 26 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥559M ($3.6M) in reported transaction value. The earliest filing StockDrifts holds for BPLATS,Inc. is dated 2023-07-24; the most recent is 2026-04-02. 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 -47.47%, 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
2026-08-14	SELL	unknown	古川徳厚	other	1.7M	¥429	+0.0%	¥6M ($38K)
2026-08-14	SELL	subscription	グロースパートナーズ株式会社	other	1.7M	¥429	+0.0%	¥6M ($38K)
2026-08-07	SELL	unknown	古川徳厚	other	1.7M	¥398	-7.8%	¥19M ($124K)
2026-08-07	SELL	unknown	古川徳厚	other	1.7M	¥398	-7.8%	¥129M ($831K)
2026-08-07	SELL	subscription	グロースパートナーズ株式会社	other	1.7M	¥398	-7.8%	¥129M ($831K)
2026-08-07	SELL	subscription	グロースパートナーズ株式会社	other	1.7M	¥398	-7.8%	¥19M ($124K)
2026-08-06	SELL	unknown	古川徳厚	other	1.7M	¥409	-4.9%	¥15M ($94K)
2026-08-06	SELL	subscription	グロースパートナーズ株式会社	other	1.7M	¥409	-4.9%	¥15M ($94K)
2026-07-30	SELL	unknown	古川徳厚	other	1.8M	¥272	-57.7%	¥9M ($61K)
2026-07-30	SELL	subscription	グロースパートナーズ株式会社	other	1.8M	¥272	-57.7%	¥9M ($61K)
2026-07-22	SELL	unknown	古川徳厚	other	1.8M	¥354	-21.2%	¥3M ($22K)
2026-07-22	SELL	subscription	グロースパートナーズ株式会社	other	1.8M	¥354	-21.2%	¥3M ($22K)
2026-07-17	SELL	subscription	グロースパートナーズ株式会社	other	1.8M	¥514	+16.5%	¥50M ($320K)
2026-07-17	SELL	unknown	古川徳厚	other	1.8M	¥514	+16.5%	¥50M ($320K)
2026-06-22	BUY	Market Buy	古川徳厚	other	1.9M	¥245	+109.8%	¥111M ($716K)
2026-06-22	BUY	subscription	グロースパートナーズ株式会社	other	1.9M	¥245	+109.8%	¥111M ($716K)
2026-06-22	BUY	Market Buy	古川徳厚	other	1.9M	¥245	+109.8%	¥113M ($726K)
2026-06-22	BUY	subscription	グロースパートナーズ株式会社	other	1.9M	¥245	+109.8%	¥113M ($726K)
2026-04-02	SELL	subscription	古川徳厚	other	927.1K	¥401	+1.3%	¥4M ($26K)
2026-04-02	SELL	subscription	グロースパートナーズ株式会社	other	927.1K	¥401	+1.3%	¥4M ($26K)
2026-03-31	SELL	subscription	古川徳厚	other	927.1K	¥430	+7.9%	¥7M ($48K)
2026-03-31	SELL	subscription	グロースパートナーズ株式会社	other	927.1K	¥430	+7.9%	¥7M ($48K)
2026-03-18	SELL	subscription	古川徳厚	other	949.9K	¥583	+31.2%	¥381M ($2.5M)
2026-03-18	SELL	subscription	グロースパートナーズ株式会社	other	949.9K	¥583	+31.2%	¥381M ($2.5M)
2026-03-11	SELL	subscription	古川徳厚	other	952.3K	¥542	+26.0%	¥382M ($2.5M)
2026-03-11	SELL	subscription	グロースパートナーズ株式会社	other	952.3K	¥542	+26.0%	¥382M ($2.5M)
2026-02-04	SELL	unknown	グロースパートナーズ株式会社 Growth Partners Co., Ltd.	other	2.0M	¥558	+28.1%	¥15M ($99K)
2026-02-04	SELL	unknown	グロースパートナーズ株式会社 Growth Partners Co., Ltd.	other	2.0M	¥558	+28.1%	¥15M ($99K)
2026-01-05	SELL	unknown	古川徳厚	other	998.7K	¥530	+24.3%	¥400M ($2.6M)
2026-01-05	SELL	unknown	グロースパートナーズ株式会社	other	998.7K	¥530	+24.3%	¥400M ($2.6M)
2025-12-09	SELL	unknown	古川徳厚	other	1.0M	¥569	+29.5%	¥408M ($2.6M)
2025-12-09	SELL	unknown	グロースパートナーズ株式会社	other	1.0M	¥569	+29.5%	¥408M ($2.6M)
2025-12-05	SELL	unknown	古川徳厚	other	1.0M	¥594	+32.5%	¥418M ($2.7M)
2025-12-05	SELL	unknown	グロースパートナーズ株式会社	other	1.0M	¥594	+32.5%	¥418M ($2.7M)
2025-12-05	SELL	unknown	古川徳厚	other	1.0M	¥594	+32.5%	¥418M ($2.7M)
2025-12-05	SELL	unknown	グロースパートナーズ株式会社	other	1.0M	¥594	+32.5%	¥418M ($2.7M)
2025-04-18	BUY	unknown	古川徳厚 Noritsu Furukawa	other	1.0M	¥460	-12.8%	¥479M ($3.1M)
2025-04-18	BUY	unknown	グロースパートナーズ株式会社 Growth Partners Co., Ltd.	other	1.0M	¥460	-12.8%	¥479M ($3.1M)
2024-08-13	SELL	unknown	TKSパートナーズ株式会社 TKS Partners Co., Ltd.	other	32.0K	¥689	+41.8%	¥510K ($3K)
2024-08-13	SELL	unknown	TKSアセットマネジメント株式会社 TKS Asset Management Co., Ltd.	other	100.0K	¥689	+41.8%	¥2M ($11K)
2024-08-13	SELL	Market Buy	TKSパートナーズ株式会社 TKS Partners Co., Ltd.	other	32.0K	¥689	+41.8%	¥170K ($1K)
2024-08-13	SELL	Market Buy	TKSアセットマネジメント株式会社 TKS Asset Management Co., Ltd.	other	100.0K	¥689	+41.8%	¥850K ($5K)
2024-08-13	BUY	Market Buy	藤田健治 Kenji Fujita	other	83.7K	¥689	-41.8%	¥3M ($18K)
2024-08-13	BUY	unknown	藤田健治 Kenji Fujita	other	83.7K	¥689	-41.8%	¥3M ($18K)
2023-07-24	SELL	unknown	TKSパートナーズ株式会社 TKS Partners Co., Ltd.	other	32.0K	¥3,285	+87.8%	¥4M ($26K)
2023-07-24	SELL	unknown	TKSアセットマネジメント株式会社 TKS Asset Management Co., Ltd.	other	100.0K	¥3,285	+87.8%	¥14M ($92K)
2023-07-24	SELL	Market Buy	TKSパートナーズ株式会社 TKS Partners Co., Ltd.	other	32.0K	¥3,285	+87.8%	¥6M ($36K)
2023-07-24	SELL	Market Buy	TKSアセットマネジメント株式会社 TKS Asset Management Co., Ltd.	other	100.0K	¥3,285	+87.8%	¥18M ($117K)
2023-07-24	BUY	Market Buy	藤田健治 Kenji Fujita	other	78.9K	¥3,285	-87.8%	¥37M ($240K)
2023-07-24	BUY	unknown	藤田健治 Kenji Fujita	other	78.9K	¥3,285	-87.8%	¥37M ($240K)

Frequently asked questions

Who has been buying BPLATS,Inc. stock?: 5 distinct investors have filed 6 disclosed large-shareholding filings in BPLATS,Inc. (4381), most recently on 2026-04-02. 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 BPLATS,Inc. have?: BPLATS,Inc. has 6 buy-side and 26 sell-side disclosures on record, covering ¥559M ($3.6M) in total reported value, spanning 2023-07-24 to 2026-04-02.
Where does StockDrifts get BPLATS,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 BPLATS,Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.