Who has been buying Rebase, Inc. stock?

7 distinct investors have filed 23 disclosed large-shareholding filings in Rebase, Inc. (5138), most recently on 2026-03-05. 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 Rebase, Inc. have?

Rebase, Inc. has 23 buy-side and 11 sell-side disclosures on record, covering ¥5.3B ($34.0M) in total reported value, spanning 2022-12-23 to 2026-03-05.

Where does StockDrifts get Rebase, 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.

Rebase, Inc. 5138

Company

株式会社RebaseRebase, Inc.

Investors

Buys

Total Value

¥5.3B ($34.0M)

Avg Return

-40.78%

Last Filing

2026-03-05

Rebase, Inc. (5138) has 23 disclosed large-shareholding filings and 11 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥5.3B ($34.0M) in reported transaction value. The earliest filing StockDrifts holds for Rebase, Inc. is dated 2022-12-23; the most recent is 2026-03-05. 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 -40.78%, 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
2026-03-05	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	206.4K	¥599	-0.3%	¥61M ($391K)
2026-02-19	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	55.8K	¥646	+7.0%	¥185M ($1.2M)
2026-01-21	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	341.4K	¥852	-29.5%	¥51M ($330K)
2026-01-08	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	281.5K	¥934	-35.6%	¥263M ($1.7M)
2024-08-21	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	288.3K	¥1,063	-43.5%	¥58M ($373K)
2024-06-20	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	234.0K	¥871	+31.0%	¥53M ($344K)
2024-04-19	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	295.2K	¥806	-25.4%	¥40M ($256K)
2023-12-21	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	245.8K	¥800	-24.9%	¥197M ($1.3M)
2023-09-14	SELL	unknown	株式会社elpido elpido Co., Ltd.	activist	1.5M	¥1,078	+44.3%	¥2M ($16K)
2023-09-14	SELL	unknown	株式会社elpido elpido Co., Ltd.	activist	1.5M	¥1,078	+44.3%	¥2M ($16K)
2023-09-14	SELL	unknown	佐藤海 Kai Sato	activist	815.5K	¥1,078	+44.3%	¥1M ($10K)
2023-09-14	SELL	unknown	佐藤海 Kai Sato	activist	815.5K	¥1,078	+44.3%	¥1M ($10K)
2023-04-11	BUY	Market Buy	SBIインベストメント株式会社 SBI Investment Co., Ltd.	passive	186.5K	¥931	-35.5%	¥171M ($1.1M)
2023-04-11	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	14.9K	¥931	-35.5%	¥1M ($8K)
2023-04-05	BUY	unknown	株式会社El Monte Garage El Monte Garage Co., Ltd.	activist	396.0K	¥933	-35.6%	¥369M ($2.4M)
2023-04-05	BUY	unknown	髙畠裕二 Yuji Takabatake	activist	359.5K	¥933	-35.6%	¥335M ($2.2M)
2023-04-03	SELL	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	13.3K	¥1,006	+40.3%	¥2M ($15K)
2023-04-03	BUY	Market Buy	SBIインベストメント株式会社 SBI Investment Co., Ltd.	passive	268.7K	¥1,006	-40.3%	¥267M ($1.7M)
2023-01-18	BUY	unknown	株式会社El Monte Garage El Monte Garage Co., Ltd.	activist	396.0K	¥1,090	-44.9%	¥432M ($2.8M)
2023-01-18	BUY	unknown	株式会社elpido elpido Co., Ltd.	activist	1.5M	¥1,090	-44.9%	¥1.7B ($10.8M)
2023-01-18	BUY	unknown	株式会社El Monte Garage El Monte Garage Co., Ltd.	activist	396.0K	¥1,090	-44.9%	¥432M ($2.8M)
2023-01-18	BUY	unknown	髙畠裕二 Yuji Takabatake	activist	359.5K	¥1,090	-44.9%	¥70M ($453K)
2023-01-18	SELL	unknown	佐藤海 Kai Sato	activist	815.5K	¥1,090	+44.9%	¥70M ($453K)
2023-01-18	BUY	unknown	株式会社elpido elpido Co., Ltd.	activist	1.5M	¥1,090	-44.9%	¥1.7B ($10.8M)
2023-01-18	SELL	unknown	佐藤海 Kai Sato	activist	815.5K	¥1,090	+44.9%	¥70M ($453K)
2023-01-18	SELL	unknown	髙畠裕二 Yuji Takabatake	activist	359.5K	¥1,090	+44.9%	¥70M ($453K)
2022-12-26	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	15.7K	¥1,052	-42.9%	¥17M ($107K)
2022-12-26	BUY	Market Buy	SBIインベストメント株式会社 SBI Investment Co., Ltd.	passive	313.8K	¥1,052	-42.9%	¥326M ($2.1M)
2022-12-26	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	15.7K	¥1,052	-42.9%	¥17M ($107K)
2022-12-26	BUY	Market Buy	SBIインベストメント株式会社 SBI Investment Co., Ltd.	passive	313.8K	¥1,052	-42.9%	¥326M ($2.1M)
2022-12-23	BUY	unknown	株式会社El Monte Garage El Monte Garage Co., Ltd.	activist	396.0K	¥1,088	-44.8%	¥431M ($2.8M)
2022-12-23	BUY	unknown	株式会社El Monte Garage El Monte Garage Co., Ltd.	activist	396.0K	¥1,088	-44.8%	¥431M ($2.8M)
2022-12-23	BUY	unknown	株式会社elpido elpido Co., Ltd.	activist	1.5M	¥1,088	-44.8%	¥1.7B ($10.8M)
2022-12-23	BUY	unknown	株式会社elpido elpido Co., Ltd.	activist	1.5M	¥1,088	-44.8%	¥1.7B ($10.8M)
2022-12-23	BUY	unknown	株式会社El Monte Garage El Monte Garage Co., Ltd.	activist	396.0K	¥1,088	-44.8%	¥431M ($2.8M)
2022-12-23	BUY	unknown	髙畠裕二 Yuji Takabatake	activist	424.0K	¥1,088	-44.8%	¥461M ($3.0M)
2022-12-23	BUY	unknown	佐藤海 Kai Sato	activist	880.0K	¥1,088	-44.8%	¥957M ($6.2M)
2022-12-23	BUY	Market Buy	SBIインベストメント株式会社 SBI Investment Co., Ltd.	passive	370.0K	¥1,088	-44.8%	¥403M ($2.6M)
2022-12-23	BUY	unknown	佐藤海 Kai Sato	activist	880.0K	¥1,088	-44.8%	¥957M ($6.2M)
2022-12-23	BUY	unknown	髙畠裕二 Yuji Takabatake	activist	424.0K	¥1,088	-44.8%	¥461M ($3.0M)
2022-12-23	BUY	unknown	髙畠裕二 Yuji Takabatake	activist	424.0K	¥1,088	-44.8%	¥461M ($3.0M)
2022-12-23	BUY	Market Buy	SBIインベストメント株式会社 SBI Investment Co., Ltd.	passive	370.0K	¥1,088	-44.8%	¥403M ($2.6M)

Frequently asked questions

Who has been buying Rebase, Inc. stock?: 7 distinct investors have filed 23 disclosed large-shareholding filings in Rebase, Inc. (5138), most recently on 2026-03-05. 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 Rebase, Inc. have?: Rebase, Inc. has 23 buy-side and 11 sell-side disclosures on record, covering ¥5.3B ($34.0M) in total reported value, spanning 2022-12-23 to 2026-03-05.
Where does StockDrifts get Rebase, 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 Rebase, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.