Who has been buying Fast Accounting Co.,Ltd. stock?

8 distinct investors have filed 16 disclosed large-shareholding filings in Fast Accounting Co.,Ltd. (5588), most recently on 2026-02-20. 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 Fast Accounting Co.,Ltd. have?

Fast Accounting Co.,Ltd. has 16 buy-side and 21 sell-side disclosures on record, covering ¥3.1B ($20.2M) in total reported value, spanning 2023-09-22 to 2026-02-20.

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.

Fast Accounting Co.,Ltd. 5588

Company

ファーストアカウンティング株式会社Fast Accounting Co.,Ltd.

Investors

Buys

Total Value

¥3.1B ($20.2M)

Avg Return

-8.59%

Last Filing

2026-02-20

Fast Accounting Co.,Ltd. (5588) has 16 disclosed large-shareholding filings and 21 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥3.1B ($20.2M) in reported transaction value. The earliest filing StockDrifts holds for Fast Accounting Co.,Ltd. is dated 2023-09-22; the most recent is 2026-02-20. Across these filings the average return since disclosure is -8.59%, 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
2026-06-01	BUY	unknown	株式会社プロシップ Pro-Ship Incorporated	strategic	566.9K	¥710	-	¥402M ($2.6M)
2026-06-01	BUY	acquisition	株式会社プロシップ Pro-Ship Incorporated	strategic	566.9K	¥710	+23.2%	¥402M ($2.6M)
2026-02-20	SELL	unknown	みずほ証券株式会社	other	27.1K	¥822	-6.5%	¥2M ($12K)
2026-02-20	SELL	unknown	アセットマネジメントOne株式会社	other	445.0K	¥822	-6.5%	¥112M ($720K)
2026-01-09	BUY	unknown	みずほ証券株式会社	other	28.7K	¥1,085	-	¥31M ($201K)
2026-01-09	SELL	unknown	アセットマネジメントOne株式会社	other	578.4K	¥1,085	+19.4%	¥151M ($972K)
2025-12-05	SELL	unknown	アセットマネジメントOne株式会社	other	715.0K	¥1,060	+17.4%	¥114M ($733K)
2025-12-05	SELL	unknown	みずほ証券株式会社	other	2.7K	¥1,060	+17.4%	¥18M ($115K)
2025-06-30	SELL	unknown	Mori Space Management株式会社 Mori Space Management Co., Ltd.	strategic	2.4M	¥1,635	+46.5%	¥9M ($57K)
2025-06-30	SELL	unknown	森啓太郎 Mori Keitaro	strategic	2.6M	¥1,635	+46.5%	¥11M ($69K)
2025-02-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	800.8K	¥1,570	+44.3%	¥265M ($1.7M)
2025-02-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	18.6K	¥1,570	-44.3%	¥10M ($66K)
2025-01-07	BUY	Market Buy	ヴォイチェフヤクブポドバス(Wojciech Jakub Podobas) Wojciech Jakub Podobas	passive	696.7K	¥1,797	-51.3%	¥240M ($1.5M)
2024-12-02	BUY	Market Buy	ヴォイチェフヤクブポドバス(Wojciech Jakub Podobas) Wojciech Jakub Podobas	passive	562.0K	¥1,537	-43.1%	¥864M ($5.6M)
2024-11-14	SELL	unknown	森啓太郎 Mori Keitaro	strategic	2.6M	¥1,466	+40.3%	¥88M ($565K)
2024-11-14	SELL	unknown	森啓太郎 Mori Keitaro	strategic	2.6M	¥1,466	+40.3%	¥88M ($565K)
2024-11-14	SELL	unknown	Mori Space Management株式会社 Mori Space Management Co., Ltd.	strategic	2.4M	¥1,466	+40.3%	¥81M ($524K)
2024-11-14	SELL	unknown	Mori Space Management株式会社 Mori Space Management Co., Ltd.	strategic	2.4M	¥1,466	+40.3%	¥81M ($524K)
2024-07-02	SELL	Market Buy	森啓太郎 Mori Keitaro	strategic	1.3M	¥1,029	+15.0%	¥14M ($92K)
2024-07-02	SELL	Market Buy	Mori Space Management株式会社 Mori Space Management Co., Ltd.	strategic	1.2M	¥1,029	+15.0%	¥13M ($85K)
2024-03-06	SELL	Market Buy	ビーネクスト・ツー・ピーティーイー・エルティーディー BEENEXT2 Pte. Ltd.	passive	0	¥1,505	+41.9%	¥13M ($87K)
2024-03-06	BUY	Market Buy	オールスター・サーズ・ファンド・ピーティーイー・エルティーディー ALL STAR SAAS FUND Pte. Ltd.	passive	222.5K	¥1,505	-41.9%	¥331M ($2.1M)
2024-02-07	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	470.3K	¥935	-6.4%	¥61M ($391K)
2024-02-07	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	5.9K	¥935	-	¥6M ($36K)
2024-01-22	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	405.4K	¥824.5	+6.1%	¥49M ($314K)
2024-01-11	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	5.1K	¥756.5	-15.7%	¥7M ($46K)
2024-01-11	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	344.9K	¥756.5	+15.7%	¥56M ($359K)
2023-12-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	14.8K	¥772	+13.3%	¥11M ($74K)
2023-12-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	271.4K	¥772	+13.3%	¥210M ($1.4M)
2023-10-26	SELL	Market Buy	森啓太郎 Mori Keitaro	strategic	1.3M	¥685	-27.7%	¥64M ($415K)
2023-10-26	SELL	Market Buy	森啓太郎 Mori Keitaro	strategic	1.3M	¥685	-27.7%	¥64M ($415K)
2023-10-26	BUY	Market Buy	株式会社Space Investment Space Investment Co., Ltd.	strategic	1.2M	¥685	-	¥822M ($5.3M)
2023-10-26	SELL	Market Buy	株式会社Space Investment Space Investment Co., Ltd.	strategic	1.2M	¥685	-27.7%	¥5M ($30K)
2023-10-03	BUY	Market Buy	オールスター・サーズ・ファンド・ピーティーイー・エルティーディー ALL STAR SAAS FUND Pte. Ltd.	passive	270.0K	¥953.5	-	-
2023-10-03	SELL	Market Buy	ビーネクスト・ツー・ピーティーイー・エルティーディー BEENEXT2 Pte. Ltd.	passive	9.1K	¥953.5	+8.2%	¥92M ($596K)
2023-10-02	SELL	Market Buy	ビーネクスト・ツー・ピーティーイー・エルティーディー BEENEXT2 Pte. Ltd.	passive	106.0K	¥950	+7.9%	¥157M ($1.0M)
2023-10-02	BUY	Market Buy	オールスター・サーズ・ファンド・ピーティーイー・エルティーディー ALL STAR SAAS FUND Pte. Ltd.	passive	270.0K	¥950	-	-
2023-09-27	BUY	negotiated	株式会社マイナビ Mynavi Corporation	strategic	250.0K	¥972.5	-	¥243M ($1.6M)
2023-09-27	BUY	Market Buy	森啓太郎 Mori Keitaro	strategic	1.4M	¥972.5	-10.0%	¥1.3B ($8.7M)
2023-09-27	BUY	Market Buy	株式会社Space Investment Space Investment Co., Ltd.	strategic	1.2M	¥972.5	-10.0%	¥1.2B ($7.5M)
2023-09-22	BUY	Market Buy	ビーネクスト・ツー・ピーティーイー・エルティーディー BEENEXT2 Pte. Ltd.	passive	271.0K	¥976.5	-10.4%	¥265M ($1.7M)
2023-09-22	BUY	Market Buy	ビーネクスト・ツー・ピーティーイー・エルティーディー BEENEXT2 Pte. Ltd.	passive	341.0K	¥976.5	-10.4%	¥333M ($2.1M)
2023-09-22	BUY	acquisition	株式会社マイナビ Mynavi Corporation	strategic	250.0K	¥976.5	-10.4%	¥244M ($1.6M)
2023-09-22	BUY	Market Buy	オールスター・サーズ・ファンド・ピーティーイー・エルティーディー ALL STAR SAAS FUND Pte. Ltd.	passive	340.0K	¥976.5	-10.4%	¥332M ($2.1M)
2023-09-22	BUY	Market Buy	オールスター・サーズ・ファンド・ピーティーイー・エルティーディー ALL STAR SAAS FUND Pte. Ltd.	passive	270.0K	¥976.5	-10.4%	¥264M ($1.7M)

Frequently asked questions

Who has been buying Fast Accounting Co.,Ltd. stock?: 8 distinct investors have filed 16 disclosed large-shareholding filings in Fast Accounting Co.,Ltd. (5588), most recently on 2026-02-20. 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 Fast Accounting Co.,Ltd. have?: Fast Accounting Co.,Ltd. has 16 buy-side and 21 sell-side disclosures on record, covering ¥3.1B ($20.2M) in total reported value, spanning 2023-09-22 to 2026-02-20.
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.