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.

Where does StockDrifts get Delta-Fly Pharma, 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.

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. 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 -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
2026-08-06	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	+1.9%	¥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	-3.9%	¥26M ($168K)
2026-07-30	BUY	unknown	江島淸 Kiyoshi Eshima	activist	887.0K	¥97	+9.3%	¥15M ($97K)
2026-07-30	SELL	unknown	江島淸 Kiyoshi Eshima	activist	887.0K	¥97	-9.3%	¥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	+1.6%	¥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	+9.5%	¥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	+15.2%	¥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	+16.5%	¥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	+9.2%	¥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	+3.1%	¥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	+1.0%	¥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	+8.8%	¥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	+9.2%	¥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	-5.5%	¥496M ($3.2M)
2026-01-26	SELL	unknown	江島京子	strategic	25.0K	¥244	+15.2%	¥5M ($33K)
2026-01-26	SELL	unknown	江島淸	activist	887.0K	¥244	+15.2%	¥184M ($1.2M)
2026-01-08	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	606.3K	¥551	+62.4%	¥3M ($22K)
2025-12-19	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	593.1K	¥500	-58.6%	¥297M ($1.9M)
2025-12-04	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	556.4K	¥512	+59.6%	¥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	+59.6%	¥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	+58.6%	¥72M ($465K)
2025-11-07	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	722.6K	¥497	-58.4%	¥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	+55.2%	¥63M ($406K)
2025-10-21	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	682.0K	¥473	-56.2%	¥37M ($239K)
2025-10-07	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	603.4K	¥534	-61.2%	¥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	+70.9%	¥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	+73.1%	¥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	+67.9%	¥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	+67.5%	¥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	+67.3%	¥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	+65.7%	¥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	+62.7%	¥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	+54.5%	¥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	-54.6%	¥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	+54.5%	¥54M ($351K)
2025-04-18	SELL	unknown	江島京子 Kyoko Ejima	strategic	25.0K	¥456	+54.6%	¥2M ($11K)
2025-04-18	SELL	unknown	江島京子 Kyoko Ejima	strategic	25.0K	¥456	+54.6%	¥2M ($11K)
2025-04-18	BUY	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	706.9K	¥456	-54.6%	¥70M ($452K)
2025-04-18	SELL	unknown	江島淸 Kiyoshi Eshima	activist	887.0K	¥456	+54.6%	¥73M ($472K)
2025-04-18	SELL	unknown	江島淸 Kiyoshi Eshima	activist	887.0K	¥456	+54.6%	¥71M ($455K)
2025-03-28	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	545.0K	¥582	+64.4%	¥83M ($533K)
2025-01-31	BUY	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	695.0K	¥538	-61.5%	¥76M ($493K)
2025-01-07	SELL	unknown	ジェー・ピー・モルガン・プライム・インク J.P. Morgan Prime Inc.	other	5.9K	¥544	+62.0%	¥4M ($24K)
2025-01-07	BUY	unknown	ジェー・ピー・モルガン・セキュリティーズ・エルエルシー J.P. Morgan Securities LLC	other	194.3K	¥544	-62.0%	¥16M ($102K)
2025-01-07	SELL	unknown	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	45.2K	¥544	+62.0%	¥14M ($92K)
2025-01-07	SELL	unknown	JPモルガン証券株式会社 JPMorgan Securities Japan Co., Ltd.	other	52.1K	¥544	+62.0%	¥107M ($693K)
2024-12-27	SELL	Market Buy	マッコーリーバンクリミテッド Macquarie Bank Limited	passive	545.0K	¥570	+63.7%	¥244M ($1.6M)
2024-12-18	BUY	unknown	ジェー・ピー・モルガン・プライム・インク J.P. Morgan Prime Inc.	other	12.8K	¥692	-70.1%	¥9M ($57K)
2024-12-18	BUY	unknown	ジェー・ピー・モルガン・セキュリティーズ・エルエルシー J.P. Morgan Securities LLC	other	165.7K	¥692	-70.1%	¥115M ($740K)
2024-12-18	BUY	unknown	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	71.0K	¥692	-70.1%	¥49M ($317K)

Showing the 50 most recent of 114 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.
Where does StockDrifts get Delta-Fly Pharma, 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 Delta-Fly Pharma, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.