Who has been buying KAINOS Laboratories, Inc. stock?

11 distinct investors have filed 18 disclosed large-shareholding filings in KAINOS Laboratories, Inc. (4556), most recently on 2026-04-07. 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 KAINOS Laboratories, Inc. have?

KAINOS Laboratories, Inc. has 18 buy-side and 11 sell-side disclosures on record, covering ¥9.3B ($60.3M) in total reported value, spanning 2021-05-18 to 2026-04-07.

Where does StockDrifts get KAINOS Laboratories, 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.

KAINOS Laboratories, Inc. 4556

Company

株式会社カイノスKAINOS Laboratories, Inc.

Investors

Buys

Total Value

¥9.3B ($60.3M)

Avg Return

+83.20%

Last Filing

2026-04-07

KAINOS Laboratories, Inc. (4556) has 18 disclosed large-shareholding filings and 11 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥9.3B ($60.3M) in reported transaction value. The earliest filing StockDrifts holds for KAINOS Laboratories, Inc. is dated 2021-05-18; the most recent is 2026-04-07. 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 +83.20%, 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
2026-04-07	SELL	unknown	みずほ信託銀行株式会社	other	54.2K	¥2,267	-0.3%	¥406M ($2.6M)
2026-04-07	SELL	unknown	みずほ証券株式会社	other	6.0K	¥2,267	-0.3%	¥299M ($1.9M)
2026-04-07	BUY	unknown	旭化成セラピューティクス株式会社 ASAHI KASEI THERAPEUTICS CORPORATION	other	940.0K	¥2,267	+0.3%	¥2.1B ($13.7M)
2026-04-07	BUY	unknown	旭化成セラピューティクス株式会社 ASAHI KASEI THERAPEUTICS CORPORATION	other	940.0K	¥2,267	+0.3%	¥2.1B ($13.7M)
2026-04-01	SELL	unknown	株式会社エスアイエル	unknown	0	¥2,261	-0.3%	¥137M ($884K)
2026-04-01	SELL	unknown	株式会社UH Partners 3	unknown	0	¥2,261	-0.3%	¥581M ($3.8M)
2026-04-01	SELL	unknown	株式会社UH Partners 2	unknown	0	¥2,261	-0.3%	¥756M ($4.9M)
2026-04-01	SELL	unknown	光通信株式会社	unknown	0	¥2,261	-0.3%	¥740M ($4.8M)
2026-04-01	BUY	unknown	Flowers株式会社	activist	3.2M	¥2,261	+0.3%	¥7.3B ($47.0M)
2026-03-31	BUY	unknown	旭化成ファーマ株式会社	other	940.0K	¥2,263	+0.2%	¥2.1B ($13.7M)
2026-03-31	SELL	unknown	杉山晶子 Akiko Sugiyama	unknown	0	¥2,263	-0.2%	¥1.0B ($6.5M)
2026-03-27	SELL	unknown	シスメックス株式会社 Sysmex Corporation	unknown	0	¥2,259	-0.3%	¥520M ($3.4M)
2026-03-23	BUY	unknown	みずほ信託銀行株式会社	other	233.5K	¥2,256	-0.4%	¥529M ($3.4M)
2026-03-23	BUY	unknown	みずほ証券株式会社	other	137.8K	¥2,256	+0.4%	¥312M ($2.0M)
2026-03-06	SELL	unknown	みずほ信託銀行株式会社	other	233.5K	¥2,279	+0.6%	¥529M ($3.4M)
2026-03-06	BUY	unknown	みずほ証券株式会社	other	72.7K	¥2,279	+0.6%	¥165M ($1.1M)
2026-02-27	BUY	unknown	シスメックス株式会社 SYSMEX CORPORATION	strategic	230.0K	¥2,278	-0.5%	¥524M ($3.4M)
2026-02-27	BUY	unknown	シスメックス株式会社 SYSMEX CORPORATION	strategic	230.0K	¥2,278	-0.5%	¥524M ($3.4M)
2026-02-20	BUY	Market Buy	株式会社エスアイエル	passive	60.8K	¥2,278	+0.5%	¥138M ($889K)
2026-02-20	BUY	Market Buy	株式会社UH Partners 3	passive	257.2K	¥2,278	-0.5%	¥583M ($3.8M)
2026-02-20	BUY	Market Buy	株式会社UH Partners 2	passive	334.2K	¥2,278	+0.5%	¥757M ($4.9M)
2026-02-20	BUY	Market Buy	光通信株式会社	passive	327.1K	¥2,278	+0.5%	¥741M ($4.8M)
2026-02-13	BUY	unknown	杉山晶子 Akiko Sugiyama	strategic	445.0K	¥2,277	-0.5%	¥1.0B ($6.5M)
2026-02-09	BUY	unknown	旭化成ファーマ株式会社 ASAHI KASEI PHARMA CORPORATION	other	940.0K	¥1,604	+41.3%	¥1.5B ($9.7M)
2025-09-26	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	60.8K	¥1,285	+76.3%	¥78M ($504K)
2025-09-26	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	241.5K	¥1,285	+76.3%	¥54M ($348K)
2025-09-26	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	334.2K	¥1,285	+76.3%	¥429M ($2.8M)
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	327.1K	¥1,285	+76.3%	¥420M ($2.7M)
2025-06-30	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	327.1K	¥1,239	+82.9%	¥405M ($2.6M)
2025-06-30	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	60.8K	¥1,239	+82.9%	¥75M ($486K)
2025-06-30	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	199.9K	¥1,239	+82.9%	¥75M ($485K)
2025-06-30	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	334.2K	¥1,239	+82.9%	¥414M ($2.7M)
2025-05-08	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	334.2K	¥1,252	+81.0%	¥418M ($2.7M)
2025-05-08	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	60.8K	¥1,252	+81.0%	¥76M ($491K)
2025-05-08	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	139.1K	¥1,252	+81.0%	¥62M ($401K)
2025-05-08	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	327.1K	¥1,252	+81.0%	¥410M ($2.6M)
2025-01-20	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	60.8K	¥1,284	+76.5%	¥78M ($504K)
2025-01-20	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	89.2K	¥1,284	+76.5%	¥77M ($498K)
2025-01-20	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	334.2K	¥1,284	+76.5%	¥429M ($2.8M)
2025-01-20	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	327.1K	¥1,284	+76.5%	¥420M ($2.7M)
2024-11-05	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	60.8K	¥1,170	+93.7%	¥71M ($459K)
2024-11-05	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	29.4K	¥1,170	+93.7%	¥34M ($222K)
2024-11-05	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	334.2K	¥1,170	+93.7%	¥19M ($124K)
2024-11-05	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	327.1K	¥1,170	+93.7%	¥383M ($2.5M)
2024-08-01	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	60.8K	¥1,191	+90.3%	¥72M ($467K)
2024-08-01	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	317.7K	¥1,191	+90.3%	¥75M ($487K)
2024-08-01	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	327.1K	¥1,191	+90.3%	¥390M ($2.5M)
2024-06-06	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	60.8K	¥1,153	+96.5%	¥70M ($452K)
2024-06-06	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	254.5K	¥1,153	+96.5%	¥53M ($339K)
2024-06-06	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	327.1K	¥1,153	+96.5%	¥377M ($2.4M)

Showing the 50 most recent of 70 filings.

Frequently asked questions

Who has been buying KAINOS Laboratories, Inc. stock?: 11 distinct investors have filed 18 disclosed large-shareholding filings in KAINOS Laboratories, Inc. (4556), most recently on 2026-04-07. 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 KAINOS Laboratories, Inc. have?: KAINOS Laboratories, Inc. has 18 buy-side and 11 sell-side disclosures on record, covering ¥9.3B ($60.3M) in total reported value, spanning 2021-05-18 to 2026-04-07.
Where does StockDrifts get KAINOS Laboratories, 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 KAINOS Laboratories, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.