Who has been buying Quantum Solutions Co.,Ltd. stock?

16 distinct investors have filed 33 disclosed large-shareholding filings in Quantum Solutions Co.,Ltd. (2338), most recently on 2026-03-12. 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 Quantum Solutions Co.,Ltd. have?

Quantum Solutions Co.,Ltd. has 33 buy-side and 42 sell-side disclosures on record, covering ¥9.0B ($58.1M) in total reported value, spanning 2021-03-26 to 2026-03-12.

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.

Quantum Solutions Co.,Ltd. 2338

Company

株式会社ビットワングループQuantum Solutions Co.,Ltd.

Investors

Buys

Total Value

¥9.0B ($58.1M)

Avg Return

-63.14%

Last Filing

2026-03-12

Quantum Solutions Co.,Ltd. (2338) has 33 disclosed large-shareholding filings and 42 disclosed disposals on record, filed by 16 distinct investors. Together those filings cover ¥9.0B ($58.1M) in reported transaction value. The earliest filing StockDrifts holds for Quantum Solutions Co.,Ltd. is dated 2021-03-26; the most recent is 2026-03-12. Across these filings the average return since disclosure is -63.14%, 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
2026-08-31	BUY	Market Buy	Blackwell Cloud Co., Limited	activist	12.3M	¥125	-12.0%	¥1.3B ($8.5M)
2026-08-31	BUY	Market Buy	Blackwell Cloud Co., Limited	activist	12.3M	¥125	-12.0%	¥1.3B ($8.5M)
2026-08-31	BUY	Market Buy	Blackwell Cloud Co., Limited	activist	12.3M	¥125	-	¥1.3B ($8.5M)
2026-08-31	BUY	Market Buy	Blackwell Cloud Co., Limited	activist	12.3M	¥125	-	¥1.3B ($8.5M)
2026-08-31	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	33.8M	¥125	-12.0%	¥398M ($2.6M)
2026-03-12	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	24.1M	¥159	+30.8%	¥104M ($672K)
2026-03-06	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	25.1M	¥117	+6.0%	¥65M ($416K)
2026-02-05	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	25.9M	¥202	+45.5%	¥99M ($642K)
2025-12-11	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	26.6M	¥430	+74.4%	¥502M ($3.2M)
2025-11-26	BUY	Market Buy	Integrated Asset Management (Asia) Limited	passive	7.0M	¥433	-74.6%	¥2.6B ($17.0M)
2025-10-24	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	27.2M	¥565	-80.5%	¥412M ($2.7M)
2025-10-21	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	27.2M	¥605	-81.8%	¥16.5B ($106.2M)
2025-05-30	SELL	Market Buy	エイペックチャイナデベロップメントリミテッドDEVELOPMENT LIMITED) APEC (CHINA	passive	1.9M	¥461	+76.1%	¥8M ($55K)
2025-05-30	SELL	Market Buy	ティンヤンチュンリミテッド Ting Yan Chun Limited	passive	18.3M	¥461	+76.1%	¥246M ($1.6M)
2025-04-07	SELL	Market Buy	エイペックチャイナデベロップメントリミテッドDEVELOPMENT LIMITED) APEC (CHINA	passive	1.9M	¥444	+75.2%	¥4M ($26K)
2025-04-07	SELL	Market Buy	ティンヤンチュンリミテッド Ting Yan Chun Limited	passive	19.0M	¥444	+75.2%	¥228M ($1.5M)
2025-03-31	SELL	Market Buy	シャープエッジベンチャーズリミテッド(SHARP EDGE VENTURES LIMITED) SHARP EDGE VENTURES LIMITED	passive	3.3M	¥495	+77.8%	¥272M ($1.8M)
2025-03-31	SELL	Market Buy	シャープエッジベンチャーズリミテッド(SHARP EDGE VENTURES LIMITED) SHARP EDGE VENTURES LIMITED	passive	1.2M	¥495	+77.8%	¥109M ($701K)
2025-02-07	SELL	Market Buy	エイペックチャイナデベロップメントリミテッドDEVELOPMENT LIMITED) APEC (CHINA	passive	1.9M	¥530	+79.3%	¥57M ($371K)
2025-02-07	BUY	Market Buy	ティンヤンチュンリミテッド Ting Yan Chun Limited	passive	19.7M	¥530	-	-
2024-09-30	SELL	Market Buy	エイペックチャイナデベロップメントリミテッドDEVELOPMENT LIMITED) APEC (CHINA	passive	2.0M	¥432	+74.5%	¥445M ($2.9M)
2024-09-30	BUY	Market Buy	ティンヤンチュンリミテッド Ting Yan Chun Limited	passive	19.7M	¥432	-	-
2024-07-26	SELL	Market Buy	ファースト・リンク・インク・リミテッド(First Link Inc Limited) First Link Inc Limited	passive	4.7M	¥438	+74.9%	¥206M ($1.3M)
2024-07-26	SELL	Market Buy	ファースト・リンク・インク・リミテッド(First Link Inc Limited) First Link Inc Limited	passive	5.1M	¥438	+74.9%	¥359M ($2.3M)
2024-07-26	SELL	Market Buy	エイペックチャイナデベロップメントリミテッドDEVELOPMENT LIMITED) APEC (CHINA	passive	3.0M	¥438	+74.9%	¥101M ($652K)
2024-07-26	SELL	Market Buy	ティンヤンチュンリミテッド Ting Yan Chun Limited	passive	19.7M	¥438	+74.9%	¥4M ($25K)
2024-07-26	SELL	Market Buy	エイペックチャイナデベロップメントリミテッド(APEC (CHINA) DEVELOPMENT LIMITED) APEC (CHINA) DEVELOPMENT LIMITED	passive	2.0M	¥438	+74.9%	¥297M ($1.9M)
2024-07-18	BUY	Market Buy	ティンヤンチュンリミテッド Ting Yan Chun Limited	passive	6.6M	¥469	-	¥3.1B ($19.8M)
2024-07-18	SELL	Market Buy	エイペックチャイナデベロップメントリミテッド(APEC (CHINA) DEVELOPMENT LIMITED) APEC (CHINA) DEVELOPMENT LIMITED	passive	2.6M	¥469	+76.5%	¥237M ($1.5M)
2024-07-18	BUY	Market Buy	エイペックチャイナデベロップメントリミテッドDEVELOPMENT LIMITED) APEC (CHINA	passive	1.1M	¥469	-76.5%	¥12M ($75K)
2024-06-28	SELL	Market Buy	ティンヤンチュンリミテッド(Ting Yan Chun Limited) Ting Yan Chun Limited	passive	19.7M	¥490	+77.5%	¥4M ($28K)
2024-06-28	BUY	Market Buy	ティンヤンチュンリミテッド(Ting Yan Chun Limited) Ting Yan Chun Limited	passive	19.7M	¥490	-	¥4M ($28K)
2024-06-24	SELL	Market Buy	ファースト・リンク・インク・リミテッド(First Link Inc Limited) First Link Inc Limited	passive	5.9M	¥528	+79.2%	¥792M ($5.1M)
2024-06-13	SELL	Market Buy	ファースト・リンク・インク・リミテッド(First Link Inc Limited) First Link Inc Limited	passive	7.4M	¥495	+77.8%	¥233M ($1.5M)
2024-05-24	BUY	Market Buy	ファースト・リンク・インク・リミテッド(First Link Inc Limited) First Link Inc Limited	passive	7.8M	¥456	-	-
2024-05-24	SELL	unknown	ホニー・リンク・コインベストメント・エル・ピー (Hony Link Co-Investment, L.P.) Hony Link Co-Investment, L.P.	unknown	0	¥456	+75.9%	¥1.0B ($6.5M)
2024-05-17	SELL	Market Buy	ファースト・リンク・インク・リミテッド(First Link Inc Limited) First Link Inc Limited	passive	8.3M	¥471	+76.7%	¥470M ($3.0M)
2024-05-17	SELL	Market Buy	ファースト・リンク・インク・リミテッド(First Link Inc Limited) First Link Inc Limited	passive	7.8M	¥471	+76.7%	¥236M ($1.5M)
2024-02-27	SELL	Market Buy	ファースト・リンク・インク・リミテッド(First Link Inc Limited) First Link Inc Limited	passive	3.1M	¥398	+72.4%	¥105M ($676K)
2024-02-26	BUY	Market Buy	ホニー・リンク・コインベストメント・エル・ピー (Hony Link Co-Investment, L.P.) Hony Link Co-Investment, L.P.	passive	742.0K	¥376	-70.7%	¥279M ($1.8M)
2024-02-16	BUY	Market Buy	ティンヤンチュンリミテッド(Ting Yan Chun Limited) Ting Yan Chun Limited	passive	6.6M	¥391.33	-71.9%	¥2.6B ($16.6M)
2024-02-16	BUY	Market Buy	ティンヤンチュンリミテッド(Ting Yan Chun Limited) Ting Yan Chun Limited	passive	6.6M	¥391.33	-	¥2.6B ($16.6M)
2024-02-07	SELL	unknown	ティンヤンチュン(Ting Yan Chun) Ting Yan Chun	unknown	0	¥440	+75.0%	¥2.1B ($13.4M)
2023-12-05	SELL	Market Buy	チャンユクシャンシャーリー(Cheung Yuk Shan Shirley) Cheung Yuk Shan Shirley	passive	1.1M	¥1,101.67	+90.0%	¥152M ($981K)
2023-11-30	SELL	Market Buy	チャンアリー(Chan Allie) Chan Allie	passive	1.3M	¥1,070	+89.7%	¥214M ($1.4M)
2023-11-22	SELL	Market Buy	エイペックチャイナデベロップメントリミテッド(APEC (CHINA) DEVELOPMENT LIMITED) APEC (CHINA) DEVELOPMENT LIMITED	passive	970.5K	¥1,130	+90.3%	¥175M ($1.1M)
2023-11-22	BUY	Market Buy	エイペックチャイナデベロップメントリミテッド(APEC (CHINA) DEVELOPMENT LIMITED) APEC (CHINA) DEVELOPMENT LIMITED	passive	1.1M	¥1,130	-90.3%	¥154M ($997K)
2023-10-27	SELL	Market Buy	シャープエッジベンチャーズリミテッド(SHARP EDGE VENTURES LIMITED) SHARP EDGE VENTURES LIMITED	passive	1.4M	¥1,066.67	+89.7%	¥149M ($960K)
2023-10-12	BUY	Market Buy	チャンアリー(Chan Allie) Chan Allie	passive	1.5M	¥760	-85.5%	¥266M ($1.7M)
2023-09-27	BUY	Market Buy	チャンアリー(Chan Allie) Chan Allie	passive	1.1M	¥640.67	-82.8%	¥730M ($4.7M)

Showing the 50 most recent of 94 filings.

Frequently asked questions

Who has been buying Quantum Solutions Co.,Ltd. stock?: 16 distinct investors have filed 33 disclosed large-shareholding filings in Quantum Solutions Co.,Ltd. (2338), most recently on 2026-03-12. 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 Quantum Solutions Co.,Ltd. have?: Quantum Solutions Co.,Ltd. has 33 buy-side and 42 sell-side disclosures on record, covering ¥9.0B ($58.1M) in total reported value, spanning 2021-03-26 to 2026-03-12.
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.