Who has been buying Stella Pharma Corporation stock?

6 distinct investors have filed 14 disclosed large-shareholding filings in Stella Pharma Corporation (4888), most recently on 2026-04-27. 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 Stella Pharma Corporation have?

Stella Pharma Corporation has 14 buy-side and 17 sell-side disclosures on record, covering ¥20.2B ($130.4M) in total reported value, spanning 2021-04-26 to 2026-04-27.

Where does StockDrifts get Stella Pharma Corporation 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.

Stella Pharma Corporation 4888

Company

ステラファーマ株式会社Stella Pharma Corporation

Investors

Buys

Total Value

¥20.2B ($130.4M)

Avg Return

+66.21%

Last Filing

2026-04-27

Stella Pharma Corporation (4888) has 14 disclosed large-shareholding filings and 17 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥20.2B ($130.4M) in reported transaction value. The earliest filing StockDrifts holds for Stella Pharma Corporation is dated 2021-04-26; the most recent is 2026-04-27. 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 +66.21%, 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
2026-07-01	BUY	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	2.1M	¥307	+0.0%	¥290M ($1.9M)
2026-06-29	BUY	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	¥310	+4.2%	¥961M ($6.2M)
2026-06-29	BUY	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	¥310	+4.2%	¥961M ($6.2M)
2026-04-27	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	1.1M	¥540	-15.0%	¥524M ($3.4M)
2026-04-23	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	2.0M	¥543	-15.5%	¥1.1B ($7.2M)
2025-11-20	BUY	unknown	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	65.5K	¥254	+181.9%	¥1.2B ($7.5M)
2025-09-19	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	2.0M	¥350	+104.6%	¥17M ($108K)
2025-05-08	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.9M	¥327	-119.0%	¥224M ($1.4M)
2025-03-21	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.6M	¥410	-74.6%	¥322M ($2.1M)
2024-07-05	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	1.5M	¥410	-74.6%	¥176M ($1.1M)
2024-06-21	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	2.0M	¥370	-93.5%	¥210M ($1.4M)
2024-06-07	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	2.6M	¥357	-100.6%	¥193M ($1.2M)
2023-08-22	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	3.2M	¥318	-125.2%	¥100M ($644K)
2023-06-22	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	3.5M	¥323	-121.7%	¥99M ($637K)
2023-05-22	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	3.9M	¥347	-106.3%	¥106M ($684K)
2023-04-12	SELL	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	4.2M	¥374	-91.4%	¥113M ($730K)
2023-03-08	BUY	subscription	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	13.4K	¥411	+74.2%	¥582M ($3.8M)
2023-03-08	BUY	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	4.6M	¥411	+74.2%	¥1.6B ($10.4M)
2023-02-14	BUY	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	4.8M	¥404	+77.2%	¥1.7B ($10.7M)
2023-02-14	BUY	subscription	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	45.6K	¥404	+77.2%	¥18M ($119K)
2023-01-17	SELL	subscription	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	45.6K	¥356	-101.1%	¥5M ($33K)
2023-01-17	BUY	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	5.2M	¥356	+101.1%	¥1.6B ($10.1M)
2023-01-11	BUY	subscription	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	60.6K	¥386	+85.5%	¥23M ($151K)
2023-01-11	BUY	subscription	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	5.5M	¥386	+85.5%	¥2.1B ($13.6M)
2023-01-10	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.8M	¥379	+88.9%	¥203M ($1.3M)
2022-05-25	SELL	Market Buy	株式会社INCJ INCJ, Ltd.	passive	1.0M	¥434	-65.0%	¥495M ($3.2M)
2022-03-15	SELL	unknown	ステラケミファ株式会社 STELLA CHEMIFA CORPORATION	activist	11.4M	¥599	-19.5%	¥1.1B ($7.1M)
2022-03-15	BUY	unknown	ステラケミファ株式会社 STELLA CHEMIFA CORPORATION	activist	11.4M	¥599	+19.5%	¥1.1B ($7.1M)
2022-02-09	SELL	Market Buy	株式会社INCJ INCJ, Ltd.	passive	2.2M	¥647	-10.7%	¥206M ($1.3M)
2022-01-27	SELL	Market Buy	株式会社INCJ INCJ, Ltd.	passive	2.5M	¥621	-15.3%	¥224M ($1.4M)
2022-01-13	SELL	Market Buy	株式会社INCJ INCJ, Ltd.	passive	2.9M	¥913	+21.6%	¥374M ($2.4M)
2021-10-21	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.3M	¥557	+28.6%	¥230M ($1.5M)
2021-10-06	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.9M	¥660	+8.5%	¥1.2B ($8.1M)
2021-06-25	SELL	Market Buy	株式会社INCJ INCJ, Ltd.	passive	3.3M	¥586	-22.2%	¥250M ($1.6M)
2021-05-06	SELL	Market Buy	株式会社INCJ INCJ, Ltd.	passive	3.6M	¥571	-25.4%	¥2.0B ($12.7M)
2021-04-30	BUY	Market Buy	株式会社INCJ INCJ, Ltd.	passive	7.0M	¥555	+29.0%	¥3.9B ($25.1M)
2021-04-26	BUY	unknown	ステラケミファ株式会社 STELLA CHEMIFA CORPORATION	strategic	12.8M	¥636	+12.6%	¥8.1B ($52.4M)
2021-04-26	BUY	unknown	ステラケミファ株式会社 STELLA CHEMIFA CORPORATION	strategic	12.8M	¥636	+12.6%	¥8.1B ($52.4M)

Frequently asked questions

Who has been buying Stella Pharma Corporation stock?: 6 distinct investors have filed 14 disclosed large-shareholding filings in Stella Pharma Corporation (4888), most recently on 2026-04-27. 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 Stella Pharma Corporation have?: Stella Pharma Corporation has 14 buy-side and 17 sell-side disclosures on record, covering ¥20.2B ($130.4M) in total reported value, spanning 2021-04-26 to 2026-04-27.
Where does StockDrifts get Stella Pharma Corporation 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 Stella Pharma Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.