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

4 distinct investors have filed 5 disclosed large-shareholding filings in Writeup Co.,Ltd. (6580), most recently on 2026-02-24. 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 Writeup Co.,Ltd. have?

Writeup Co.,Ltd. has 5 buy-side and 5 sell-side disclosures on record, covering ¥892M ($5.8M) in total reported value, spanning 2021-11-29 to 2026-02-24.

Where does StockDrifts get Writeup 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.

Writeup Co.,Ltd. 6580

Company

株式会社ライトアップWriteup Co.,Ltd.

Investors

Buys

Total Value

¥892M ($5.8M)

Avg Return

-31.58%

Last Filing

2026-02-24

Writeup Co.,Ltd. (6580) has 5 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥892M ($5.8M) in reported transaction value. The earliest filing StockDrifts holds for Writeup Co.,Ltd. is dated 2021-11-29; the most recent is 2026-02-24. 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 -31.58%, 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
2026-02-24	BUY	Market Buy	志野文哉	passive	63.3K	¥1,503	+21.2%	¥75M ($484K)
2026-02-24	BUY	Market Buy	ウィル・フィールド・キャピタル・ピーティーイー・エルティーディー WILL FIELD CAPITAL PTE.LTD.	passive	290.6K	¥1,503	+21.2%	¥344M ($2.2M)
2025-07-29	BUY	Market Buy	ウィル・フィールド・キャピタル・ピーティーイー・エルティーディー(WILL FIELD CAPITAL PTE.LTD.) WILL FIELD CAPITAL PTE.LTD.	passive	290.6K	¥2,680	-55.8%	¥779M ($5.0M)
2025-07-29	BUY	Market Buy	ウィル・フィールド・キャピタル・ピーティーイー・エルティーディー(WILL FIELD CAPITAL PTE.LTD.) WILL FIELD CAPITAL PTE.LTD.	passive	290.6K	¥2,680	-55.8%	¥779M ($5.0M)
2025-05-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	197.2K	¥1,607	+26.3%	¥195M ($1.3M)
2025-03-24	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	318.5K	¥1,428	+17.1%	¥109M ($701K)
2024-12-06	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	394.8K	¥1,224	+3.3%	¥117M ($757K)
2024-08-07	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	490.5K	¥843	+40.5%	¥59M ($382K)
2024-02-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	420.6K	¥705	-67.9%	¥51M ($330K)
2022-10-05	BUY	unknown	白石崇 Takashi Shiraishi	activist	2.5M	¥932	+27.0%	¥2.3B ($14.8M)
2022-09-21	BUY	unknown	白石崇 Takashi Shiraishi	activist	2.5M	¥972	+21.8%	¥2.4B ($15.4M)
2022-09-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	492.8K	¥1,040	-13.8%	¥89M ($573K)
2022-06-07	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	578.0K	¥1,893	-37.5%	¥254M ($1.6M)
2022-05-11	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	443.9K	¥2,550	-53.6%	¥1.1B ($7.3M)
2022-03-25	BUY	Market Buy	白石崇 Takashi Shiraishi	activist	2.5M	¥2,442	-51.5%	¥54M ($348K)
2021-11-29	BUY	unknown	白石崇 Takashi Shiraishi	activist	2.4M	¥3,495	-66.1%	¥8.5B ($55.0M)

Frequently asked questions

Who has been buying Writeup Co.,Ltd. stock?: 4 distinct investors have filed 5 disclosed large-shareholding filings in Writeup Co.,Ltd. (6580), most recently on 2026-02-24. 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 Writeup Co.,Ltd. have?: Writeup Co.,Ltd. has 5 buy-side and 5 sell-side disclosures on record, covering ¥892M ($5.8M) in total reported value, spanning 2021-11-29 to 2026-02-24.
Where does StockDrifts get Writeup 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 Writeup Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.