Who has been buying Dream Incubator Inc. stock?

12 distinct investors have filed 21 disclosed large-shareholding filings in Dream Incubator Inc. (4310), most recently on 2025-12-12. 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 Dream Incubator Inc. have?

Dream Incubator Inc. has 21 buy-side and 11 sell-side disclosures on record, covering ¥12.5B ($80.7M) in total reported value, spanning 2021-03-18 to 2025-12-12.

Where does StockDrifts get Dream Incubator 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.

Dream Incubator Inc. 4310

Company

株式会社ドリームインキュベータDream Incubator Inc.

Investors

Buys

Total Value

¥12.5B ($80.7M)

Avg Return

+61.38%

Last Filing

2025-12-12

Dream Incubator Inc. (4310) has 21 disclosed large-shareholding filings and 11 disclosed disposals on record, filed by 12 distinct investors. Together those filings cover ¥12.5B ($80.7M) in reported transaction value. The earliest filing StockDrifts holds for Dream Incubator Inc. is dated 2021-03-18; the most recent is 2025-12-12. 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 +61.38%, 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
2025-12-12	BUY	unknown	田村稔郎 TAMURA TOSHIRO	other	739.0K	¥2,460	+3.9%	¥237M ($1.5M)
2025-12-12	BUY	unknown	田村稔郎 TAMURA TOSHIRO	other	739.0K	¥2,460	+3.9%	¥237M ($1.5M)
2025-12-12	BUY	Market Buy	田村稔郎 TAMURA TOSHIRO	other	739.0K	¥2,460	+3.9%	¥237M ($1.5M)
2025-01-14	SELL	Market Buy	古谷昇 kotani noboru	passive	382.1K	¥3,350	+23.7%	¥351M ($2.3M)
2024-12-26	SELL	Market Buy	古谷昇 kotani noboru	passive	487.1K	¥3,200	+20.2%	¥339M ($2.2M)
2024-04-22	SELL	negotiated	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	280.9K	¥2,361	-8.2%	¥5.0B ($32.0M)
2024-04-02	SELL	negotiated	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	2.4M	¥2,549	-0.2%	¥131M ($843K)
2024-04-01	BUY	negotiated	株式会社山口フィナンシャルグループ Yamaguchi Financial Group, Inc.	strategic	2.1M	¥2,609	-2.1%	¥5.5B ($35.3M)
2024-01-11	BUY	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	2.4M	¥3,170	-19.4%	¥3.8B ($24.2M)
2024-01-11	SELL	unknown	ユナイテッド・マネージャーズ・ジャパン株式会社 United Managers Japan Inc.	unknown	0	¥3,170	+19.4%	¥3.6B ($23.4M)
2023-05-25	BUY	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	1.2M	¥2,443	+4.6%	¥258M ($1.7M)
2023-02-15	BUY	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	1.1M	¥2,597	-1.6%	¥274M ($1.8M)
2023-01-24	SELL	unknown	ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC) MIRI Capital Management LLC	activist	486.5K	¥2,629	+2.8%	¥300M ($1.9M)
2022-12-06	BUY	unknown	田村稔郎 Toshiro Tamura	other	705.4K	¥2,685	-4.8%	¥1.9B ($12.2M)
2022-11-22	SELL	unknown	ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC) MIRI Capital Management LLC	activist	601.1K	¥2,742	+6.8%	¥296M ($1.9M)
2022-11-21	BUY	Market Buy	ユナイテッド・マネージャーズ・ジャパン株式会社 United Managers Japan Inc.	activist	1.1M	¥2,789	-8.4%	¥201M ($1.3M)
2022-11-15	SELL	subscription	ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC) MIRI Capital Management LLC	activist	708.8K	¥2,567	+0.5%	¥473M ($3.1M)
2022-03-04	BUY	Market Buy	ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC) MIRI Capital Management LLC	activist	889.5K	¥2,133	+19.8%	¥238M ($1.5M)
2022-02-02	BUY	Market Buy	ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC) MIRI Capital Management LLC	activist	777.9K	¥2,100	+21.7%	¥245M ($1.6M)
2022-02-01	BUY	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	1.0M	¥1,970	+29.7%	¥236M ($1.5M)
2022-01-31	BUY	Market Buy	ユナイテッド・マネージャーズ・ジャパン株式会社 United Managers Japan Inc.	activist	1.1M	¥1,907	+34.0%	¥209M ($1.3M)
2022-01-26	BUY	Market Buy	ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC) MIRI Capital Management LLC	activist	661.2K	¥1,753	+45.8%	¥194M ($1.3M)
2022-01-20	BUY	unknown	ミリ・キャピタル・マネジメント・エルエルシー (MIRI Capital Management LLC) MIRI Capital Management LLC	activist	550.2K	¥1,900	+34.5%	¥1.0B ($6.7M)
2021-12-27	BUY	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	913.1K	¥1,460	+75.0%	¥166M ($1.1M)
2021-12-20	BUY	Market Buy	ユナイテッド・マネージャーズ・ジャパン株式会社 United Managers Japan Inc.	activist	956.4K	¥1,321	+93.4%	¥168M ($1.1M)
2021-12-07	BUY	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	798.9K	¥1,215	+110.3%	¥265M ($1.7M)
2021-12-07	BUY	Market Buy	ユナイテッド・マネージャーズ・ジャパン株式会社 United Managers Japan Inc.	activist	828.8K	¥1,215	+110.3%	¥270M ($1.7M)
2021-11-30	BUY	Market Buy	株式会社ヴァレックス・パートナーズ VARECS Partners Limited	activist	581.2K	¥827	+208.9%	¥481M ($3.1M)
2021-11-30	BUY	Market Buy	ユナイテッド・マネージャーズ・ジャパン株式会社 United Managers Japan Inc.	activist	607.2K	¥827	+208.9%	¥502M ($3.2M)
2021-07-26	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	57.7K	¥925	+176.2%	¥53M ($344K)
2021-07-26	BUY	Market Buy	レオス・キャピタルワークス株式会社 RHEOS CAPITAL WORKS Inc.	passive	382.7K	¥925	+176.2%	¥349M ($2.3M)
2021-05-21	SELL	unknown	株式会社ワイズマン Wiseman Co., Ltd.	other	0	¥1,042	-145.2%	¥4M ($27K)
2021-05-21	SELL	unknown	堀紘一 Koichi Hori	strategic	1.0K	¥1,042	-145.2%	¥14M ($89K)
2021-05-20	BUY	negotiated	株式会社電通グループ DENTSU GROUP INC.	strategic	2.2M	¥1,029	+148.3%	¥2.3B ($14.6M)
2021-05-20	BUY	negotiated	株式会社電通グループ DENTSU GROUP INC.	strategic	2.2M	¥1,029	+148.3%	¥2.3B ($14.6M)
2021-03-18	SELL	unknown	ベイリー・ギフォード・アンド・カンパニー(Baillie Gifford & Co) Baillie Gifford & Co	other	0	¥933.079	-173.8%	¥505M ($3.3M)

Frequently asked questions

Who has been buying Dream Incubator Inc. stock?: 12 distinct investors have filed 21 disclosed large-shareholding filings in Dream Incubator Inc. (4310), most recently on 2025-12-12. 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 Dream Incubator Inc. have?: Dream Incubator Inc. has 21 buy-side and 11 sell-side disclosures on record, covering ¥12.5B ($80.7M) in total reported value, spanning 2021-03-18 to 2025-12-12.
Where does StockDrifts get Dream Incubator 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 Dream Incubator Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.