Who has been buying PeptiDream Inc. stock?

20 distinct investors have filed 34 disclosed large-shareholding filings in PeptiDream Inc. (4587), most recently on 2026-03-23. 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 PeptiDream Inc. have?

PeptiDream Inc. has 34 buy-side and 19 sell-side disclosures on record, covering ¥237.0B ($1.5B) in total reported value, spanning 2021-03-30 to 2026-03-23.

Where does StockDrifts get PeptiDream 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.

PeptiDream Inc. 4587

Company

ペプチドリーム株式会社PeptiDream Inc.

Investors

Buys

Total Value

¥237.0B ($1.5B)

Avg Return

-37.50%

Last Filing

2026-03-23

PeptiDream Inc. (4587) has 34 disclosed large-shareholding filings and 19 disclosed disposals on record, filed by 20 distinct investors. Together those filings cover ¥237.0B ($1.5B) in reported transaction value. The earliest filing StockDrifts holds for PeptiDream Inc. is dated 2021-03-30; the most recent is 2026-03-23. 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 -37.50%, 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
2026-06-22	SELL	unknown	アセットマネジメントOne株式会社	other	3.7M	¥976.2	+0.1%	¥1.3B ($8.6M)
2026-06-22	BUY	unknown	みずほ証券株式会社	other	144.2K	¥976.2	-0.1%	¥141M ($908K)
2026-06-22	SELL	unknown	みずほ信託銀行株式会社	other	1.4M	¥976.2	+0.1%	¥63M ($409K)
2026-03-23	BUY	unknown	アセットマネジメントOne株式会社	other	5.0M	¥1,162	+2.6%	¥6.0B ($38.6M)
2026-03-23	BUY	unknown	みずほ信託銀行株式会社	other	1.5M	¥1,162	+2.6%	¥1.8B ($11.5M)
2026-03-23	BUY	Market Buy	M&Gインベストメンツ(シンガポール)ピーティーイー・リミテッドPte. Ltd.) M&G Investments (Singapore	passive	12.4M	¥1,162	-2.6%	¥14.8B ($95.4M)
2026-03-23	BUY	Market Buy	M&Gインベストメント・マネジメント・リミテッド、M&Gインベストメンツ(シンガポール)ピーティーイー・リミテッドPte. Ltd.) M&G Investment Management Limited	passive	12.4M	¥1,162	+2.6%	¥14.8B ($95.4M)
2025-09-22	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	unknown	0	¥1,664	+28.4%	¥519M ($3.3M)
2025-09-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	4.6M	¥1,664	-28.4%	¥7.5B ($48.5M)
2025-09-22	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	796.1K	¥1,664	-28.4%	¥64.9B ($418.7M)
2025-04-22	BUY	Market Buy	M&Gインベストメンツ(シンガポール)ピーティーイー・リミテッドPte. Ltd.) M&G Investments (Singapore	passive	11.0M	¥1,877	-36.5%	¥20.7B ($133.8M)
2025-04-22	BUY	Market Buy	M&Gインベストメント・マネジメント・リミテッド、M&Gインベストメンツ(シンガポール)ピーティーイー・リミテッドPte. Ltd.) M&G Investment Management Limited	passive	11.0M	¥1,877	-36.5%	¥2.5B ($15.9M)
2025-02-06	SELL	Market Buy	タイヨウ・パシフィック・パートナーズ・エルピー (Taiyo Pacific Partners L.P.) Taiyo Pacific Partners L.P.	activist	5.1M	¥2,014	+40.8%	¥3.2B ($20.4M)
2025-01-31	SELL	Market Buy	タイヨウ・パシフィック・パートナーズ・エルピー (Taiyo Pacific Partners L.P.) Taiyo Pacific Partners L.P.	activist	6.6M	¥2,146	+44.5%	¥3.0B ($19.3M)
2024-11-06	SELL	Market Buy	タイヨウ・パシフィック・パートナーズ・エルピー (Taiyo Pacific Partners L.P.) Taiyo Pacific Partners L.P.	activist	8.0M	¥2,853.5	+58.2%	¥3.8B ($24.4M)
2024-09-24	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	398.3K	¥2,561	-53.5%	¥1.0B ($6.6M)
2024-09-24	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	313.1K	¥2,561	-53.5%	¥802M ($5.2M)
2024-09-24	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	5.9M	¥2,561	-53.5%	¥15.1B ($97.4M)
2024-09-06	BUY	Market Buy	M&Gインベストメンツ(シンガポール)ピーティーイー・リミテッドPte. Ltd.) M&G Investments (Singapore	passive	9.7M	¥2,524	-52.8%	¥24.6B ($158.6M)
2024-09-06	BUY	Market Buy	M&Gインベストメント・マネジメント・リミテッド、M&Gインベストメンツ(シンガポール)ピーティーイー・リミテッドPte. Ltd.) M&G Investment Management Limited	passive	9.7M	¥2,524	-52.8%	¥24.3B ($157.0M)
2023-12-22	BUY	Market Buy	M&Gインベストメント・マネジメント・リミテッド(M&G Investment Management Limited) M&G Investment Management Limited	passive	9.8M	¥1,319	-9.6%	¥1.7B ($11.3M)
2023-10-20	BUY	Market Buy	M&Gインベストメント・マネジメント・リミテッド(M&G Investment Management Limited) M&G Investment Management Limited	passive	8.5M	¥1,256	-5.1%	¥1.8B ($11.4M)
2023-07-21	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.8M	¥1,807	-34.0%	¥3.3B ($21.0M)
2023-07-21	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	4.4M	¥1,807	+34.0%	¥1.0B ($6.7M)
2023-07-07	BUY	Market Buy	M&Gインベストメント・マネジメント・リミテッド(M&G Investment Management Limited) M&G Investment Management Limited	passive	7.1M	¥1,985	-40.0%	¥14.0B ($90.5M)
2023-06-12	SELL	unknown	窪田規一 Kiichi Kubota	other	13.0M	¥2,388	+50.1%	¥3.3B ($21.2M)
2023-04-06	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.8M	¥1,894	+37.1%	¥25M ($159K)
2023-04-06	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	5.0M	¥1,894	+37.1%	¥74M ($477K)
2023-02-21	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	5.1M	¥1,845	+35.4%	¥648M ($4.2M)
2023-02-21	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.8M	¥1,845	-35.4%	¥24M ($155K)
2022-12-21	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	5.4M	¥1,542	-22.7%	¥461M ($3.0M)
2022-12-21	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.8M	¥1,542	-22.7%	¥40M ($259K)
2022-10-06	SELL	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.8M	¥1,771	+32.7%	¥414M ($2.7M)
2022-10-06	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	5.1M	¥1,771	-32.7%	¥691M ($4.5M)
2022-09-05	BUY	Market Buy	タイヨウ・パシフィック・パートナーズ・エルピー (Taiyo Pacific Partners L.P.) Taiyo Pacific Partners L.P.	activist	9.4M	¥1,552	-23.2%	¥2.1B ($13.5M)
2022-08-02	BUY	Market Buy	タイヨウ・パシフィック・パートナーズ・エルピー (Taiyo Pacific Partners L.P.) Taiyo Pacific Partners L.P.	activist	8.0M	¥1,583	-24.7%	¥2.1B ($13.5M)
2022-06-23	BUY	acquisition	タイヨウ・パシフィック・パートナーズ・エルピー (Taiyo Pacific Partners L.P.) Taiyo Pacific Partners L.P.	activist	6.7M	¥1,258	-5.3%	¥8.4B ($54.2M)
2022-04-06	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.0M	¥2,301	-48.2%	¥4.6B ($29.9M)
2022-04-06	BUY	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	4.7M	¥2,301	-48.2%	¥10.9B ($70.1M)
2021-12-10	BUY	Market Buy	ジェイオーエイチシーエム(シンガポール)・ピーティーイー・リミテッドPte. Limited) JOHCM (Singapore	passive	5.7M	¥2,779	-57.1%	¥15.8B ($101.7M)
2021-12-10	BUY	Market Buy	ジェイオーエイチシーエム(ユーエスエー)・インクInc) JOHCM (USA	passive	0	¥2,779	-57.1%	-
2021-12-10	BUY	Market Buy	ジェイ・オー・ハンブロ・キャピタル・マネージメント・リミテッド J O Hambro Capital Management Limited	passive	0	¥2,779	-57.1%	-
2021-12-08	BUY	Market Buy	ジェイオーエイチシーエム(ユーエスエー)・インクInc) JOHCM (USA	passive	0	¥2,743	-56.5%	-
2021-12-08	BUY	Market Buy	ジェイオーエイチシーエム(シンガポール)・ピーティーイー・リミテッドPte. Limited) JOHCM (Singapore	passive	7.2M	¥2,743	-56.5%	¥19.4B ($125.3M)
2021-12-08	BUY	Market Buy	ジェイ・オー・ハンブロ・キャピタル・マネージメント・リミテッド J O Hambro Capital Management Limited	passive	0	¥2,743	-56.5%	-
2021-12-07	BUY	Market Buy	ジェイオーエイチシーエム(ユーエスエー)・インクInc) JOHCM (USA	passive	0	¥2,617	-54.5%	-
2021-12-07	BUY	Market Buy	ジェイオーエイチシーエム(シンガポール)・ピーティーイー・リミテッドPte. Limited) JOHCM (Singapore	passive	8.2M	¥2,617	-54.5%	¥291M ($1.9M)
2021-12-07	BUY	Market Buy	ジェイオーエイチシーエム(ユーエスエー)・インクInc) JOHCM (USA	passive	0	¥2,617	-54.5%	-
2021-12-07	BUY	Market Buy	ジェイオーエイチシーエム(シンガポール)・ピーティーイー・リミテッドPte. Limited) JOHCM (Singapore	passive	9.4M	¥2,617	-54.5%	¥24.4B ($157.2M)
2021-12-07	BUY	Market Buy	ジェイオーエイチシーエム(ユーエスエー)・インクInc) JOHCM (USA	passive	0	¥2,617	-54.5%	-

Showing the 50 most recent of 80 filings.

Frequently asked questions

Who has been buying PeptiDream Inc. stock?: 20 distinct investors have filed 34 disclosed large-shareholding filings in PeptiDream Inc. (4587), most recently on 2026-03-23. 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 PeptiDream Inc. have?: PeptiDream Inc. has 34 buy-side and 19 sell-side disclosures on record, covering ¥237.0B ($1.5B) in total reported value, spanning 2021-03-30 to 2026-03-23.
Where does StockDrifts get PeptiDream 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 PeptiDream Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.