Who has been buying Chiome Bioscience Inc. stock?

7 distinct investors have filed 14 disclosed large-shareholding filings in Chiome Bioscience Inc. (4583), 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 Chiome Bioscience Inc. have?

Chiome Bioscience Inc. has 14 buy-side and 41 sell-side disclosures on record, covering ¥6.8B ($43.7M) in total reported value, spanning 2021-12-22 to 2026-04-21.

Where does StockDrifts get Chiome Bioscience 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.

Chiome Bioscience Inc. 4583

Company

株式会社カイオム・バイオサイエンスChiome Bioscience Inc.

Investors

Buys

Total Value

¥6.8B ($43.7M)

Avg Return

-29.18%

Last Filing

2026-04-21

Chiome Bioscience Inc. (4583) has 14 disclosed large-shareholding filings and 41 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥6.8B ($43.7M) in reported transaction value. The earliest filing StockDrifts holds for Chiome Bioscience Inc. is dated 2021-12-22; 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 -29.18%, 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
2026-07-08	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	3.3M	¥74	+5.4%	¥64M ($410K)
2026-06-24	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	4.2M	¥66	-9.1%	¥56M ($359K)
2026-06-16	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	5.1M	¥68	-7.3%	¥56M ($359K)
2026-06-05	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	6.0M	¥74	-2.7%	¥69M ($445K)
2026-05-26	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	7.8M	¥90	+25.6%	¥72M ($467K)
2026-05-26	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	6.9M	¥90	+25.6%	¥72M ($464K)
2026-04-21	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	8.7M	¥102	+10.8%	¥53M ($344K)
2026-04-06	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	9.3M	¥103	+1.9%	¥75M ($483K)
2026-03-25	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	10.1M	¥104	+1.0%	¥62M ($401K)
2026-03-12	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	10.8M	¥111	+7.2%	¥87M ($560K)
2026-02-26	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	11.7M	¥112	+8.0%	¥58M ($376K)
2026-02-03	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	12.3M	¥113	+8.8%	¥90M ($582K)
2026-01-16	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	13.2M	¥119	+13.4%	¥40M ($260K)
2025-12-22	BUY	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	13.6M	¥107	-3.7%	¥1.5B ($9.4M)
2024-12-09	SELL	Market Buy	ネクスト・グロース株式会社 Next Growth Co., Ltd.	passive	1.1M	¥227	+54.6%	¥1M ($10K)
2024-12-09	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	1.9M	¥227	+54.6%	¥175M ($1.1M)
2024-12-04	SELL	Market Buy	ネクスト・グロース株式会社 Next Growth Co., Ltd.	passive	1.1M	¥179	+42.5%	¥1M ($8K)
2024-12-04	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	2.7M	¥179	+42.5%	¥151M ($977K)
2024-12-02	SELL	Market Buy	ネクスト・グロース株式会社 Next Growth Co., Ltd.	passive	1.1M	¥188	+45.2%	¥1M ($8K)
2024-12-02	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	3.5M	¥188	+45.2%	¥136M ($875K)
2024-11-29	SELL	Market Buy	ネクスト・グロース株式会社 Next Growth Co., Ltd.	passive	1.1M	¥207	+50.2%	¥4M ($26K)
2024-11-29	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	4.3M	¥207	+50.2%	¥52M ($333K)
2024-11-14	SELL	Market Buy	ネクスト・グロース株式会社 Next Growth Co., Ltd.	passive	1.1M	¥103	+0.0%	¥1M ($8K)
2024-11-14	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	4.5M	¥103	+0.0%	¥81M ($522K)
2024-10-28	SELL	Market Buy	ネクスト・グロース株式会社 Next Growth Co., Ltd.	passive	1.1M	¥101	-2.0%	¥2M ($12K)
2024-10-28	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	5.4M	¥101	-2.0%	¥70M ($452K)
2024-09-30	BUY	Market Buy	ネクスト・グロース株式会社 Next Growth Co., Ltd.	passive	1.1M	¥122	-15.6%	¥11M ($72K)
2024-09-30	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	6.1M	¥122	+15.6%	¥106M ($684K)
2024-09-17	BUY	Market Buy	ネクスト・グロース株式会社 Next Growth Co., Ltd.	passive	1.1M	¥111	-7.2%	¥122M ($788K)
2024-09-17	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	7.2M	¥111	+7.2%	¥77M ($499K)
2024-09-06	BUY	Market Buy	ネクスト・グロース株式会社 Next Growth Co., Ltd.	passive	1.1M	¥105	-1.9%	¥116M ($745K)
2024-09-06	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	7.9M	¥105	+1.9%	¥64M ($415K)
2024-08-27	BUY	Market Buy	ネクスト・グロース株式会社 Next Growth Co., Ltd.	passive	1.1M	¥122	-15.6%	¥134M ($866K)
2024-08-27	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	8.6M	¥122	+15.6%	¥60M ($388K)
2024-08-19	BUY	Market Buy	ネクスト・グロース株式会社 Next Growth Co., Ltd.	passive	1.1M	¥115	-10.4%	¥127M ($816K)
2024-08-19	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	9.2M	¥115	+10.4%	¥73M ($469K)
2024-08-07	BUY	Market Buy	ネクスト・グロース株式会社 Next Growth Co., Ltd.	passive	1.1M	¥100	+3.0%	¥110M ($710K)
2024-08-07	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	10.0M	¥100	-3.0%	¥19M ($122K)
2024-07-24	BUY	Market Buy	ネクスト・グロース株式会社 Next Growth Co., Ltd.	passive	1.1M	¥122	-15.6%	¥134M ($866K)
2024-07-24	BUY	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	10.2M	¥122	-15.6%	¥1.2B ($8.0M)
2024-04-05	BUY	unknown	バークレイズ証券株式会社 Barclays Securities Co., Ltd.	other	0	¥135	-23.7%	-
2024-04-05	SELL	unknown	バークレイズ・キャピタル・セキュリティーズ・リミテッド Barclays Capital Securities Ltd.	other	272.1K	¥135	+23.7%	¥3M ($19K)
2024-04-05	BUY	unknown	バークレイズ・バンク・ピーエルシー Barclays Bank PLC	other	2.5M	¥135	-23.7%	¥315M ($2.0M)
2024-02-19	BUY	unknown	バークレイズ・キャピタル・セキュリティーズ・リミテッド Barclays Capital Securities Ltd.	other	284.7K	¥159	-35.2%	¥19M ($124K)
2024-02-19	BUY	unknown	バークレイズ証券株式会社 Barclays Securities Co., Ltd.	other	0	¥159	-35.2%	-
2024-02-19	BUY	unknown	バークレイズ・バンク・ピーエルシー Barclays Bank PLC	other	3.2M	¥159	-35.2%	¥513M ($3.3M)
2024-01-29	BUY	unknown	バークレイズ・キャピタル・セキュリティーズ・リミテッド Barclays Capital Securities Ltd.	other	162.1K	¥140	-26.4%	¥14M ($90K)
2024-01-29	BUY	unknown	バークレイズ証券株式会社 Barclays Securities Co., Ltd.	other	0	¥140	-26.4%	-
2024-01-29	BUY	unknown	バークレイズ・バンク・ピーエルシー Barclays Bank PLC	other	3.2M	¥140	-26.4%	¥421M ($2.7M)
2024-01-24	SELL	Market Buy	グロース・キャピタル株式会社 Growth Capital Inc.	passive	2.6M	¥149	+30.9%	¥86M ($553K)

Showing the 50 most recent of 72 filings.

Frequently asked questions

Who has been buying Chiome Bioscience Inc. stock?: 7 distinct investors have filed 14 disclosed large-shareholding filings in Chiome Bioscience Inc. (4583), 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 Chiome Bioscience Inc. have?: Chiome Bioscience Inc. has 14 buy-side and 41 sell-side disclosures on record, covering ¥6.8B ($43.7M) in total reported value, spanning 2021-12-22 to 2026-04-21.
Where does StockDrifts get Chiome Bioscience 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 Chiome Bioscience Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.