Who has been buying Delta-Fly Pharma, Inc. stock?

16 distinct investors have filed 32 disclosed large-shareholding filings in Delta-Fly Pharma, Inc. (4598), most recently on 2026-04-24. 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 Delta-Fly Pharma, Inc. have?

Delta-Fly Pharma, Inc. has 32 buy-side and 71 sell-side disclosures on record, covering ¥2.4B ($15.5M) in total reported value, spanning 2021-03-19 to 2026-04-24.

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.

Delta-Fly Pharma, Inc. 4598

Company

ＤｅｌｔａーＦｌｙ　Ｐｈａｒｍａ株式会社Delta-Fly Pharma, Inc.

Investors

Buys

Total Value

¥2.4B ($15.5M)

Avg Return

-68.27%

Last Filing

2026-04-24

Delta-Fly Pharma, Inc. (4598) has 32 disclosed large-shareholding filings and 71 disclosed disposals on record, filed by 16 distinct investors. Together those filings cover ¥2.4B ($15.5M) in reported transaction value. The earliest filing StockDrifts holds for Delta-Fly Pharma, Inc. is dated 2021-03-19; the most recent is 2026-04-24. Across these filings the average return since disclosure is -68.27%, 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
2026-09-25	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	1.2M	¥117	+0.0%	¥142M ($913K)
2026-09-16	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥109	-	-
2026-09-16	SELL	private	エボファンド Evo Fund	engagement	5.5M	¥109	-7.3%	¥197M ($1.3M)
2026-09-09	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥125	-	-
2026-09-09	SELL	private	エボファンド Evo Fund	engagement	7.8M	¥125	+6.4%	¥27M ($175K)
2026-09-08	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥127	-	-
2026-09-08	SELL	private	エボファンド Evo Fund	engagement	8.1M	¥127	+7.9%	¥177M ($1.1M)
2026-09-08	BUY	unknown	アーカス・インベストメント・リミテッド Arcus Investment Limited Director/Executive Director Edward Cartwright	other	743.7K	¥127	-7.9%	¥94M ($609K)
2026-08-28	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥105	-	-
2026-08-28	SELL	private	エボファンド Evo Fund	engagement	10.2M	¥105	-11.4%	¥19M ($121K)
2026-08-17	BUY	private	エボファンド Evo Fund	engagement	10.5M	¥106	+10.4%	¥1.1B ($7.2M)
2026-08-17	BUY	Market Buy	エボリューション・キャピタル・マネジメント・エルエルシー Evolution Capital Management LLC	passive	0	¥106	+10.4%	-
2026-08-17	SELL	subscription	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	0	¥106	-10.4%	¥147M ($948K)
2026-08-06	SELL	unknown	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	558.0K	¥108	-8.3%	¥24M ($153K)
2026-07-31	SELL	subscription	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	1.5M	¥102	-14.7%	¥26M ($168K)
2026-07-30	BUY	unknown	江島淸 Kiyoshi Eshima	activist	887.0K	¥97	-	¥15M ($97K)
2026-07-30	SELL	unknown	江島淸 Kiyoshi Eshima	activist	887.0K	¥97	-20.6%	¥40M ($258K)
2026-06-19	BUY	unknown	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	774.1K	¥122	-4.1%	¥94M ($609K)
2026-06-03	SELL	subscription	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	1.8M	¥147	+20.4%	¥24M ($156K)
2026-04-24	SELL	subscription	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	2.0M	¥197	+40.6%	¥29M ($185K)
2026-04-23	SELL	subscription	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	2.1M	¥200	+41.5%	¥92M ($596K)
2026-04-20	SELL	subscription	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	2.7M	¥207	+43.5%	¥24M ($157K)
2026-04-07	BUY	subscription	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	2.8M	¥192	-39.1%	¥16M ($104K)
2026-04-01	SELL	subscription	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	2.7M	¥200	+41.5%	¥28M ($182K)
2026-03-17	SELL	subscription	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	2.9M	¥227	+48.5%	¥35M ($228K)
2026-03-04	SELL	subscription	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	3.1M	¥228	+48.7%	¥144M ($929K)
2026-02-06	BUY	Market Buy	マッコーリー　バンク　リミテッド Macquarie Bank Limited	passive	3.8M	¥219	-46.6%	¥496M ($3.2M)
2026-01-26	SELL	unknown	江島淸	activist	887.0K	¥244	+52.0%	¥53M ($345K)
2026-01-26	SELL	unknown	江島京子	strategic	25.0K	¥244	+52.0%	¥1M ($10K)
2026-01-08	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	606.3K	¥551	+78.8%	¥3M ($22K)
2025-12-19	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	593.1K	¥500	-76.6%	¥297M ($1.9M)
2025-12-04	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	556.4K	¥512	+77.2%	¥93M ($599K)
2025-11-14	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	723.9K	¥512	+77.2%	¥242M ($1.6M)
2025-11-12	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	1.2M	¥500	+76.6%	¥72M ($465K)
2025-11-07	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	722.6K	¥497	-76.5%	¥20M ($129K)
2025-10-24	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	1.4M	¥462	+74.7%	¥63M ($406K)
2025-10-21	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	682.0K	¥473	-75.3%	¥37M ($239K)
2025-10-07	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	603.4K	¥534	-78.1%	¥322M ($2.1M)
2025-08-01	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	1.5M	¥711	+83.5%	¥84M ($545K)
2025-07-11	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	1.6M	¥770	+84.8%	¥121M ($780K)
2025-07-02	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	1.8M	¥644	+81.8%	¥156M ($1.0M)
2025-06-05	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	2.1M	¥636	+81.6%	¥85M ($547K)
2025-06-02	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	2.3M	¥632	+81.5%	¥120M ($774K)
2025-05-28	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	2.5M	¥603	+80.6%	¥89M ($575K)
2025-05-22	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	2.6M	¥555	+78.9%	¥140M ($903K)
2025-05-12	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	3.0M	¥455	+74.3%	¥14M ($89K)
2025-05-08	BUY	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	3.0M	¥456	-74.3%	¥797M ($5.1M)
2025-05-07	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	581.1K	¥455	+74.3%	¥54M ($351K)
2025-04-18	SELL	unknown	江島京子 Kyoko Ejima	strategic	25.0K	¥456	+74.3%	¥2M ($11K)
2025-04-18	SELL	unknown	江島淸 Kiyoshi Eshima	activist	887.0K	¥456	+74.3%	¥71M ($455K)

Showing the 50 most recent of 127 filings.

Frequently asked questions

Who has been buying Delta-Fly Pharma, Inc. stock?: 16 distinct investors have filed 32 disclosed large-shareholding filings in Delta-Fly Pharma, Inc. (4598), most recently on 2026-04-24. 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 Delta-Fly Pharma, Inc. have?: Delta-Fly Pharma, Inc. has 32 buy-side and 71 sell-side disclosures on record, covering ¥2.4B ($15.5M) in total reported value, spanning 2021-03-19 to 2026-04-24.
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.