Who has been buying Kidswell Bio Corporation stock?

2 distinct investors have filed 7 disclosed large-shareholding filings in Kidswell Bio Corporation (4584), most recently on 2025-09-26. 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 Kidswell Bio Corporation have?

Kidswell Bio Corporation has 7 buy-side and 38 sell-side disclosures on record, covering ¥96M ($617K) in total reported value, spanning 2021-04-15 to 2025-09-26.

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.

Kidswell Bio Corporation 4584

Company

株式会社ジーンテクノサイエンスKidswell Bio Corporation

Investors

Buys

Total Value

¥96M ($617K)

Avg Return

+13.29%

Last Filing

2025-09-26

Kidswell Bio Corporation (4584) has 7 disclosed large-shareholding filings and 38 disclosed disposals on record, filed by 2 distinct investors. Together those filings cover ¥96M ($617K) in reported transaction value. The earliest filing StockDrifts holds for Kidswell Bio Corporation is dated 2021-04-15; the most recent is 2025-09-26. Across these filings the average return since disclosure is +13.29%, 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
2026-07-29	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	2.3M	¥138	-20.3%	¥40M ($261K)
2026-05-21	SELL	unknown	ノーリツ鋼機株式会社 Noritsu Koki Co.,Ltd.	strategic	9.5M	¥186	+10.8%	¥1.2B ($8.1M)
2025-09-26	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	2.6M	¥278	+40.3%	¥136M ($880K)
2025-08-27	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	3.1M	¥238	+30.3%	¥145M ($936K)
2025-08-21	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	3.7M	¥258	+35.7%	¥186M ($1.2M)
2025-04-23	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	4.2M	¥136	-22.1%	¥117M ($758K)
2025-04-22	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	5.2M	¥130	-27.7%	¥130M ($836K)
2025-04-15	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	6.4M	¥136	-22.1%	¥65M ($419K)
2025-04-10	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	6.9M	¥111	-49.5%	¥63M ($409K)
2025-04-09	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	7.6M	¥107	-55.1%	¥22M ($139K)
2025-03-31	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	8.2M	¥112	-48.2%	¥49M ($314K)
2025-03-14	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	8.8M	¥137	-21.2%	¥98M ($631K)
2025-03-06	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	9.4M	¥128	-29.7%	¥52M ($337K)
2025-03-05	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	9.8M	¥129	-28.7%	¥42M ($271K)
2025-02-27	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	10.6M	¥153	-8.5%	¥56M ($362K)
2025-01-21	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	11.2M	¥103	-61.2%	¥35M ($224K)
2025-01-09	SELL	Market Buy	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	11.7M	¥108	-53.7%	¥24M ($156K)
2024-09-05	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	11.7M	¥125	-32.8%	¥53M ($343K)
2024-08-27	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	12.4M	¥149	-11.4%	¥34M ($220K)
2024-07-17	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	12.8M	¥147	-12.9%	¥87M ($561K)
2024-07-10	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	13.9M	¥134	-23.9%	¥53M ($344K)
2024-04-19	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	14.3M	¥141	-17.7%	¥11M ($73K)
2024-01-15	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	14.1M	¥133	-24.8%	¥51M ($331K)
2023-12-13	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	14.6M	¥127	-30.7%	¥14M ($92K)
2023-11-15	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	15.0M	¥142	-16.9%	¥161M ($1.0M)
2023-10-23	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	15.6M	¥129	-28.7%	¥49M ($313K)
2023-10-10	BUY	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	16.3M	¥160	+3.8%	¥5M ($35K)
2023-10-04	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	16.4M	¥157	-5.7%	¥151M ($971K)
2023-10-03	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	17.9M	¥166	+0.0%	¥26M ($167K)
2023-09-11	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	18.8M	¥170	+2.4%	¥59M ($383K)
2023-09-07	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	18.8M	¥175	+5.1%	¥58M ($371K)
2023-08-25	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	19.3M	¥184	+9.8%	¥70M ($452K)
2023-08-18	BUY	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	19.7M	¥175	-5.1%	¥62M ($398K)
2023-08-02	BUY	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	19.7M	¥194	-14.4%	¥1.6B ($10.1M)
2023-07-18	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	4.7M	¥216	+23.1%	¥35M ($223K)
2023-03-07	BUY	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	4.9M	¥266	-37.6%	¥113M ($726K)
2022-12-12	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	4.3M	¥294	+43.5%	¥99M ($639K)
2022-11-29	BUY	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	4.7M	¥300	-44.7%	¥13M ($85K)
2022-07-22	BUY	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	4.7M	¥265	-	¥1.2B ($8.0M)
2022-07-22	BUY	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	4.7M	¥265	-37.4%	¥686M ($4.4M)
2022-06-03	BUY	unknown	大友宏一 KOICHI OTOMO	unknown	1.5M	¥287	-42.2%	¥90M ($582K)
2021-10-12	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	1.5M	¥498	+66.7%	¥180M ($1.2M)
2021-09-29	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	1.9M	¥591	+71.9%	¥158M ($1.0M)
2021-09-14	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	2.2M	¥835	+80.1%	¥178M ($1.1M)
2021-08-19	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	2.4M	¥673	+75.3%	¥203M ($1.3M)
2021-06-30	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	2.7M	¥643	+74.2%	¥198M ($1.3M)
2021-05-20	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	3.1M	¥439	+62.2%	¥135M ($873K)
2021-04-15	SELL	subscription	ハイツ・キャピタル・マネジメント・インク(Heights Capital Management, Inc.) Heights Capital Management, Inc.	passive	3.4M	¥486	+65.8%	¥144M ($929K)

Frequently asked questions

Who has been buying Kidswell Bio Corporation stock?: 2 distinct investors have filed 7 disclosed large-shareholding filings in Kidswell Bio Corporation (4584), most recently on 2025-09-26. 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 Kidswell Bio Corporation have?: Kidswell Bio Corporation has 7 buy-side and 38 sell-side disclosures on record, covering ¥96M ($617K) in total reported value, spanning 2021-04-15 to 2025-09-26.
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.