Who has been buying OncoTherapy Science, Inc. stock?

3 distinct investors have filed 6 disclosed large-shareholding filings in OncoTherapy Science, Inc. (4564), most recently on 2026-04-21. 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 OncoTherapy Science, Inc. have?

OncoTherapy Science, Inc. has 6 buy-side and 50 sell-side disclosures on record, covering ¥4.0B ($26.1M) in total reported value, spanning 2021-05-10 to 2026-04-21.

Where does StockDrifts get OncoTherapy Science, 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.

OncoTherapy Science, Inc. 4564

Company

オンコセラピー・サイエンス株式会社OncoTherapy Science, Inc.

Investors

Buys

Total Value

¥4.0B ($26.1M)

Avg Return

+8.11%

Last Filing

2026-04-21

OncoTherapy Science, Inc. (4564) has 6 disclosed large-shareholding filings and 50 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥4.0B ($26.1M) in reported transaction value. The earliest filing StockDrifts holds for OncoTherapy Science, Inc. is dated 2021-05-10; the most recent is 2026-04-21. 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 +8.11%, 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
2026-06-15	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	19.6M	¥20	+5.0%	¥96M ($622K)
2026-06-11	BUY	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	24.6M	¥19	+0.0%	¥467M ($3.0M)
2026-06-10	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	24.6M	¥19	+0.0%	¥93M ($601K)
2026-04-21	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	29.8M	¥27	+25.9%	¥122M ($785K)
2026-04-20	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	34.6M	¥31	+35.5%	¥171M ($1.1M)
2026-04-20	BUY	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	34.6M	¥31	-35.5%	¥1.1B ($6.9M)
2026-04-13	BUY	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	40.6M	¥24	+0.0%	¥21M ($138K)
2026-03-24	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	39.6M	¥21	-47.6%	¥101M ($650K)
2026-02-06	SELL	Market Buy	ロング　コリドー　アセット　マネジメント　リミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	44.9M	¥20	-55.0%	¥62M ($401K)
2026-01-30	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	48.4M	¥20	-55.0%	¥86M ($554K)
2026-01-14	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	53.2M	¥22	-40.9%	¥86M ($556K)
2025-12-26	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	57.6M	¥20	-55.0%	¥8M ($49K)
2025-12-24	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	58.0M	¥21	-47.6%	¥122M ($785K)
2025-12-24	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	64.6M	¥21	-47.6%	¥89M ($573K)
2025-12-19	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	69.6M	¥20	-55.0%	¥84M ($543K)
2025-12-19	BUY	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	74.6M	¥20	+55.0%	¥1.5B ($9.6M)
2025-12-15	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	74.6M	¥21	-47.6%	¥86M ($557K)
2025-12-12	BUY	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	79.6M	¥21	+47.6%	¥1.7B ($10.8M)
2025-12-12	BUY	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	79.6M	¥21	+47.6%	¥1.7B ($10.8M)
2025-12-10	BUY	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	79.6M	¥22	+40.9%	¥1.8B ($11.3M)
2025-10-01	BUY	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	13.6M	¥23	+34.8%	¥106M ($683K)
2025-10-01	BUY	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	13.6M	¥23	+34.8%	¥106M ($683K)
2025-10-01	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	13.6M	¥23	-34.8%	¥106M ($683K)
2025-10-01	BUY	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	13.6M	¥23	+34.8%	¥106M ($683K)
2025-09-30	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	18.2M	¥26	-19.2%	¥125M ($807K)
2025-09-25	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	23.0M	¥27	-14.8%	¥135M ($873K)
2025-09-08	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	28.0M	¥29	-6.9%	¥81M ($520K)
2025-09-01	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	31.0M	¥28	-10.7%	¥78M ($501K)
2025-08-18	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	34.0M	¥26	-19.2%	¥116M ($751K)
2025-07-01	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	39.0M	¥29	-6.9%	¥325M ($2.1M)
2025-06-30	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	51.4M	¥31	+0.0%	¥27M ($177K)
2025-06-27	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	52.4M	¥27	-14.8%	¥117M ($754K)
2025-06-23	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	57.5M	¥23	-34.8%	¥10M ($64K)
2025-06-17	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	58.0M	¥23	-34.8%	¥86M ($554K)
2025-05-30	SELL	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	62.5M	¥22	-40.9%	¥63M ($406K)
2025-05-07	BUY	Market Buy	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	66.0M	¥23	+34.8%	¥1.5B ($9.8M)
2024-07-16	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	10.8M	¥33	+6.1%	¥182M ($1.2M)
2024-07-05	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	16.5M	¥36	+13.9%	¥9M ($61K)
2024-07-02	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	16.8M	¥39	+20.5%	¥228M ($1.5M)
2024-07-01	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	23.0M	¥38	+18.4%	¥138M ($888K)
2024-06-18	BUY	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	26.8M	¥32	-3.1%	¥858M ($5.5M)
2024-06-10	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	26.8M	¥23	-34.8%	¥115M ($740K)
2024-06-07	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	32.3M	¥23	-34.8%	¥42M ($271K)
2024-05-28	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	34.3M	¥30	-3.3%	¥256M ($1.7M)
2024-05-24	BUY	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	44.0M	¥33	-6.1%	¥1.5B ($9.4M)
2024-05-23	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	44.0M	¥22	-40.9%	¥74M ($479K)
2024-05-16	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	48.0M	¥15	-106.7%	¥25M ($164K)
2024-05-08	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	50.0M	¥18	-72.2%	¥59M ($382K)
2024-05-07	SELL	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	54.0M	¥17	-82.3%	¥28M ($182K)
2024-04-25	BUY	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	56.0M	¥18	+72.2%	¥555M ($3.6M)

Showing the 50 most recent of 69 filings.

Frequently asked questions

Who has been buying OncoTherapy Science, Inc. stock?: 3 distinct investors have filed 6 disclosed large-shareholding filings in OncoTherapy Science, Inc. (4564), most recently on 2026-04-21. 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 OncoTherapy Science, Inc. have?: OncoTherapy Science, Inc. has 6 buy-side and 50 sell-side disclosures on record, covering ¥4.0B ($26.1M) in total reported value, spanning 2021-05-10 to 2026-04-21.
Where does StockDrifts get OncoTherapy Science, 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 OncoTherapy Science, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.