Who has been buying S Science Company, Ltd. stock?

9 distinct investors have filed 13 disclosed large-shareholding filings in S Science Company, Ltd. (5721), most recently on 2026-03-05. 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 S Science Company, Ltd. have?

S Science Company, Ltd. has 13 buy-side and 36 sell-side disclosures on record, covering ¥19.9B ($128.7M) in total reported value, spanning 2021-04-05 to 2026-03-05.

Where does StockDrifts get S Science Company, Ltd. 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.

S Science Company, Ltd. 5721

Company

株式会社エス・サイエンスS Science Company, Ltd.

Investors

Buys

Total Value

¥19.9B ($128.7M)

Avg Return

+64.57%

Last Filing

2026-03-05

S Science Company, Ltd. (5721) has 13 disclosed large-shareholding filings and 36 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥19.9B ($128.7M) in reported transaction value. The earliest filing StockDrifts holds for S Science Company, Ltd. is dated 2021-04-05; the most recent is 2026-03-05. 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 +64.57%, 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
2026-07-06	SELL	Market Buy	フィリップ証券株式会社 Phillip Securities Japan,Ltd.	passive	13.6M	¥64	+4.7%	¥10M ($66K)
2026-07-06	BUY	Market Buy	フィリップ証券株式会社 Phillip Securities Japan,Ltd.	passive	0	¥64	-4.7%	¥817M ($5.3M)
2026-03-05	BUY	Market Buy	フィリップ証券株式会社 Phillip Securities Japan,Ltd.	passive	13.6M	¥115	-12.2%	¥1.4B ($9.3M)
2026-03-05	BUY	Market Buy	フィリップ証券株式会社 Phillip Securities Japan,Ltd.	passive	13.6M	¥115	-12.2%	¥1.4B ($9.3M)
2026-03-04	BUY	Market Buy	フィリップ証券株式会社 Phillip Securities Japan,Ltd.	passive	13.6M	¥111	-9.0%	¥1.4B ($9.0M)
2026-03-04	BUY	Market Buy	フィリップ証券株式会社 Phillip Securities Japan,Ltd.	passive	13.6M	¥111	-9.0%	¥1.4B ($9.0M)
2026-01-26	SELL	unknown	KAY LEO BROTHERS LIMITED JAPAN株式会社	other	0	¥135	+25.2%	-
2026-01-26	BUY	unknown	ケイレオブラザーズリミテッド KAY LEO BROTHERS LIMITED	other	26.8M	¥135	-25.2%	¥2.7B ($17.5M)
2026-01-14	BUY	unknown	KAY LEO BROTHERS LIMITED JAPAN株式会社	other	9.3M	¥185	+45.4%	¥941M ($6.1M)
2026-01-14	SELL	unknown	ケイレオブラザーズリミテッド KAY LEO BROTHERS LIMITED	other	17.5M	¥185	+45.4%	¥1.8B ($11.4M)
2026-01-14	BUY	unknown	KAY LEO BROTHERS LIMITED JAPAN株式会社	other	9.3M	¥185	+45.4%	¥941M ($6.1M)
2026-01-14	SELL	unknown	ケイレオブラザーズリミテッド KAY LEO BROTHERS LIMITED	other	17.5M	¥185	+45.4%	¥1.8B ($11.4M)
2026-01-14	BUY	unknown	KAY LEO BROTHERS LIMITED JAPAN株式会社	other	9.3M	¥185	+45.4%	¥941M ($6.1M)
2026-01-14	SELL	unknown	ケイレオブラザーズリミテッド KAY LEO BROTHERS LIMITED	other	17.5M	¥185	+45.4%	¥1.8B ($11.4M)
2025-11-21	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	6.5M	¥116	+12.9%	¥264M ($1.7M)
2025-11-12	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	8.8M	¥146	+30.8%	¥288M ($1.9M)
2025-11-04	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	10.8M	¥133	+24.1%	¥228M ($1.5M)
2025-10-31	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	12.6M	¥144	-29.9%	¥698M ($4.5M)
2025-10-31	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	12.7M	¥144	+29.9%	¥688M ($4.4M)
2025-10-16	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	17.5M	¥140	+27.9%	¥233M ($1.5M)
2025-10-14	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	19.3M	¥155	-34.8%	¥3.0B ($19.3M)
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	19.3M	¥199	+49.3%	¥886M ($5.7M)
2025-09-12	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	24.3M	¥289	+65.0%	¥1.4B ($8.7M)
2025-09-12	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	24.3M	¥289	-65.0%	¥1.4B ($8.7M)
2025-09-11	BUY	Market Buy	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	9.3M	¥289	-65.0%	¥4.2B ($27.1M)
2025-09-11	BUY	unknown	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	9.3M	¥289	-65.0%	¥4.2B ($27.1M)
2025-09-11	BUY	unknown	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	26.8M	¥289	-65.0%	¥4.2B ($27.1M)
2025-09-10	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	31.9M	¥311	+67.5%	¥441M ($2.8M)
2025-09-10	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	29.6M	¥311	+67.5%	¥635M ($4.1M)
2025-09-09	BUY	Market Buy	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	9.3M	¥311	-67.5%	¥4.5B ($29.2M)
2025-09-09	BUY	unknown	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	9.3M	¥311	-67.5%	¥2.9B ($18.7M)
2025-09-08	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	33.5M	¥263	-61.6%	¥8.8B ($56.8M)
2025-06-16	SELL	Market Buy	株式会社グローバルエナジー GlobalEnergy Co., Ltd.	passive	2.9M	¥342	+70.5%	¥2.2B ($14.2M)
2025-05-07	SELL	Market Buy	株式会社ミュージックコーポレーション MUSIC CORPORATION CO., LTD.	passive	3.6M	¥70	-44.3%	¥617M ($4.0M)
2025-05-01	BUY	unknown	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	9.3M	¥68	+48.5%	¥1.5B ($9.5M)
2025-05-01	SELL	unknown	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	9.3M	¥68	-48.5%	¥1.5B ($9.5M)
2025-05-01	BUY	Market Buy	株式会社ミュージックコーポレーション MUSIC COPORATION CO.,LTD.	passive	12.4M	¥68	+48.5%	¥845M ($5.5M)
2025-05-01	BUY	Market Buy	株式会社グローバルエナジー GlobalEnergy Co., Ltd.	passive	9.3M	¥68	+48.5%	¥634M ($4.1M)
2025-04-07	BUY	unknown	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	31.1M	¥72	+40.3%	¥2.2B ($14.4M)
2025-04-07	BUY	unknown	ケイレオブラザーズリミテッド(KAY LEO BROTHERS LIMITED) KAY LEO BROTHERS LIMITED	other	31.1M	¥72	+40.3%	¥2.2B ($14.4M)
2025-03-12	SELL	unknown	株式会社エルアイイーエイチ Life Intelligent Enterprise Holdings Co.,Ltd.	unknown	0	¥26	-288.5%	¥807M ($5.2M)
2025-03-12	BUY	unknown	株式会社エルアイイーエイチ Life Intelligent Enterprise Holdings Co.,Ltd.	unknown	0	¥26	+288.5%	¥857M ($5.5M)
2022-07-04	BUY	Market Buy	株式会社エルアイイーエイチ Life Intelligent Enterprise Holdings Co.,Ltd.	strategic	31.1M	¥28	+260.7%	¥311M ($2.0M)
2022-07-04	BUY	negotiated	株式会社エルアイイーエイチ Life Intelligent Enterprise Holdings Co.,Ltd.	strategic	31.1M	¥28	+260.7%	¥870M ($5.6M)
2022-07-04	BUY	negotiated	株式会社エルアイイーエイチ Life Intelligent Enterprise Holdings Co.,Ltd.	strategic	31.1M	¥28	+260.7%	¥870M ($5.6M)
2022-01-31	BUY	private	EVOLUTION JAPANアセットマネジメント株式会社(Evolution Japan Asset Management Co. EVOLUTION JAPAN Asset Management Co., Ltd.	passive	0	¥23	+339.1%	-
2022-01-31	SELL	private	エボファンド Evo Fund	activist	6.8M	¥23	-339.1%	¥332K ($2K)
2022-01-11	BUY	private	EVOLUTION JAPANアセットマネジメント株式会社(Evolution Japan Asset Management Co. EVOLUTION JAPAN Asset Management Co., Ltd.	passive	0	¥24	+320.8%	-
2022-01-11	SELL	private	エボファンド Evo Fund	activist	8.3M	¥24	-320.8%	¥362K ($2K)
2021-12-13	BUY	private	EVOLUTION JAPANアセットマネジメント株式会社(Evolution Japan Asset Management Co. EVOLUTION JAPAN Asset Management Co., Ltd.	passive	0	¥29	+248.3%	-

Showing the 50 most recent of 89 filings.

Frequently asked questions

Who has been buying S Science Company, Ltd. stock?: 9 distinct investors have filed 13 disclosed large-shareholding filings in S Science Company, Ltd. (5721), most recently on 2026-03-05. 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 S Science Company, Ltd. have?: S Science Company, Ltd. has 13 buy-side and 36 sell-side disclosures on record, covering ¥19.9B ($128.7M) in total reported value, spanning 2021-04-05 to 2026-03-05.
Where does StockDrifts get S Science Company, Ltd. 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 S Science Company, Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.