Who has been buying Seria Co., Ltd. stock?

6 distinct investors have filed 10 disclosed large-shareholding filings in Seria Co., Ltd. (2782), most recently on 2026-03-23. 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 Seria Co., Ltd. have?

Seria Co., Ltd. has 10 buy-side and 18 sell-side disclosures on record, covering ¥16.0B ($103.0M) in total reported value, spanning 2022-04-19 to 2026-03-23.

Where does StockDrifts get Seria Co., 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.

Seria Co., Ltd. 2782

Company

株式会社セリアSeria Co., Ltd.

Investors

Buys

Total Value

¥16.0B ($103.0M)

Avg Return

+35.93%

Last Filing

2026-03-23

Seria Co., Ltd. (2782) has 10 disclosed large-shareholding filings and 18 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥16.0B ($103.0M) in reported transaction value. The earliest filing StockDrifts holds for Seria Co., Ltd. is dated 2022-04-19; the most recent is 2026-03-23. 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 +35.93%, 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
2026-07-24	SELL	unknown	株式会社ヒロコーポレーション K.K. HIRO CORPORATION	other	9.6M	¥3,805	-7.5%	¥3.8B ($24.4M)
2026-05-28	BUY	unknown	株式会社ヒロコーポレーション K.K. HIRO CORPORATION	other	10.6M	¥3,735	-0.5%	¥39.5B ($254.7M)
2026-03-23	SELL	unknown	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	3.6M	¥3,995	+11.1%	¥3.2B ($20.7M)
2026-02-17	BUY	unknown	株式会社ヒロコーポレーション	other	10.6M	¥4,235	+16.2%	¥37.5B ($242.0M)
2026-02-17	BUY	unknown	河合秋代	other	1.2M	¥4,235	+16.2%	¥4.2B ($27.0M)
2025-12-26	BUY	unknown	河合秋代	other	1.2M	¥3,480	-2.0%	¥4.2B ($27.0M)
2025-12-26	SELL	unknown	株式会社ヒロコーポレーション	other	10.6M	¥3,480	-2.0%	¥37.5B ($242.0M)
2025-11-26	SELL	unknown	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	4.4M	¥3,280	-8.2%	¥2.9B ($18.5M)
2025-08-13	BUY	unknown	河合秋代 Akiyo Kawai	other	1.2M	¥3,055	+16.2%	¥3.6B ($23.3M)
2025-08-13	SELL	unknown	株式会社ヒロコーポレーション K.K. HIRO CORPORATION	other	12.6M	¥3,055	-16.2%	¥38.4B ($247.7M)
2025-07-22	BUY	unknown	株式会社ヒロコーポレーション K.K. HIRO CORPORATION	other	25.1M	¥2,926	+21.3%	¥73.5B ($474.5M)
2025-07-22	BUY	unknown	河合秋代 Akiyo Kawai	other	1.2M	¥2,926	+21.3%	¥3.5B ($22.3M)
2025-06-23	SELL	unknown	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	5.3M	¥2,749	-29.1%	¥2.2B ($14.0M)
2025-05-19	SELL	unknown	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	6.1M	¥2,895	-22.6%	¥2.6B ($16.7M)
2025-02-18	SELL	unknown	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	7.0M	¥2,516	-41.1%	¥2.1B ($13.3M)
2025-02-06	BUY	unknown	河合秋代 Akiyo Kawai	other	1.2M	¥2,582	+37.5%	¥3.0B ($19.7M)
2025-02-06	BUY	unknown	株式会社ヒロコーポレーション K.K. HIRO CORPORATION	other	25.1M	¥2,582	+37.5%	¥64.9B ($418.7M)
2024-12-05	SELL	unknown	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	7.8M	¥2,732	-29.9%	¥2.1B ($13.5M)
2024-09-12	BUY	unknown	河合秋代 Akiyo Kawai	other	1.2M	¥3,510	+1.1%	¥4.1B ($26.7M)
2024-09-12	BUY	unknown	株式会社ヒロコーポレーション K.K. HIRO CORPORATION	other	25.1M	¥3,510	+1.1%	¥88.2B ($569.2M)
2024-07-01	BUY	Market Buy	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	8.6M	¥2,892	+22.8%	¥2.3B ($14.6M)
2024-06-06	BUY	Market Buy	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	7.8M	¥2,754	+28.9%	¥2.1B ($13.7M)
2024-04-05	BUY	unknown	河合秋代 Akiyo Kawai	other	1.2M	¥2,934	+21.0%	¥3.5B ($22.3M)
2024-04-05	BUY	unknown	株式会社ヒロコーポレーション K.K. HIRO CORPORATION	other	25.1M	¥2,934	+21.0%	¥73.7B ($475.8M)
2024-03-29	SELL	unknown	河合秋代 Akiyo Kawai	other	1.2M	¥3,010	-17.9%	¥2.8B ($18.0M)
2024-03-29	BUY	unknown	株式会社ヒロコーポレーション K.K. HIRO CORPORATION	other	25.1M	¥3,010	+17.9%	¥7.0B ($45.4M)
2024-03-29	SELL	unknown	河合宏光 KAWAI HIROMITSU	unknown	0	¥3,010	-17.9%	¥5.2B ($33.3M)
2023-08-18	SELL	unknown	河合宏光 KAWAI HIROMITSU	other	1.7M	¥2,299	-54.4%	¥1.8B ($11.4M)
2023-08-18	BUY	unknown	河合秋代 Akiyo Kawai	other	2.1M	¥2,299	+54.4%	¥4.9B ($31.3M)
2023-08-18	BUY	unknown	株式会社ヒロコーポレーション K.K. HIRO CORPORATION	other	22.8M	¥2,299	+54.4%	¥52.4B ($338.2M)
2023-08-18	BUY	unknown	河合秋代 Akiyo Kawai	other	2.1M	¥2,299	+54.4%	¥4.9B ($31.3M)
2023-08-18	BUY	unknown	株式会社ヒロコーポレーション K.K. HIRO CORPORATION	other	22.8M	¥2,299	+54.4%	¥52.4B ($338.2M)
2023-08-18	SELL	unknown	河合宏光 KAWAI HIROMITSU	other	1.7M	¥2,299	-54.4%	¥1.8B ($11.4M)
2023-05-29	BUY	Market Buy	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	7.0M	¥2,275	+56.0%	¥1.8B ($11.4M)
2023-05-19	BUY	Market Buy	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	6.2M	¥2,415	+47.0%	¥1.9B ($12.1M)
2023-03-09	SELL	unknown	河合宏光 KAWAI HIROMITSU	activist	2.5M	¥2,640	-34.5%	¥2.0B ($12.9M)
2023-03-09	SELL	unknown	河合秋代 Akiyo Kawai	strategic	2.1M	¥2,640	-34.5%	¥40M ($258K)
2023-03-09	BUY	unknown	株式会社ヒロコーポレーション K.K. HIRO CORPORATION	other	22.8M	¥2,640	+34.5%	¥60.2B ($388.3M)
2023-03-09	SELL	unknown	河合秋代 Akiyo Kawai	strategic	2.1M	¥2,640	-34.5%	¥40M ($258K)
2023-03-09	BUY	unknown	株式会社ヒロコーポレーション K.K. HIRO CORPORATION	other	22.8M	¥2,640	+34.5%	¥60.2B ($388.3M)
2023-03-09	SELL	unknown	河合宏光 KAWAI HIROMITSU	activist	2.5M	¥2,640	-34.5%	¥2.0B ($12.9M)
2022-11-18	BUY	Market Buy	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	5.5M	¥2,707	+31.1%	¥2.1B ($13.5M)
2022-11-09	BUY	Market Buy	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	4.7M	¥2,583	+37.4%	¥2.0B ($13.0M)
2022-09-16	SELL	unknown	オービス・インベストメント・マネジメント・リミテッド Orbis Investment Management Limited	other	2.2M	¥2,582	-37.5%	¥1.1B ($7.2M)
2022-09-16	SELL	unknown	オービス・インベストメント・マネジメント・(ガーンジー)・リミテッドLimited) Orbis Investment Management (Guernsey	other	1.0M	¥2,582	-37.5%	¥881M ($5.7M)
2022-07-04	BUY	unknown	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	3.9M	¥2,500	+42.0%	¥9.8B ($63.1M)
2022-07-04	BUY	unknown	スプラウスグローブ・インベストメント・マネジメント・リミテッド(Sprucegrove Investment Management Ltd.) Sprucegrove Investment Management Ltd.	other	3.9M	¥2,500	+42.0%	¥9.8B ($63.1M)
2022-04-19	BUY	unknown	オービス・インベストメント・マネジメント・リミテッド Orbis Investment Management Limited	other	2.6M	¥2,572	+38.0%	¥6.7B ($43.1M)
2022-04-19	BUY	unknown	オービス・インベストメント・マネジメント・(ガーンジー)・リミテッドLimited) Orbis Investment Management (Guernsey	other	1.4M	¥2,572	+38.0%	¥3.5B ($22.5M)

Frequently asked questions

Who has been buying Seria Co., Ltd. stock?: 6 distinct investors have filed 10 disclosed large-shareholding filings in Seria Co., Ltd. (2782), most recently on 2026-03-23. 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 Seria Co., Ltd. have?: Seria Co., Ltd. has 10 buy-side and 18 sell-side disclosures on record, covering ¥16.0B ($103.0M) in total reported value, spanning 2022-04-19 to 2026-03-23.
Where does StockDrifts get Seria Co., 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 Seria Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.