Who has been buying KAYAC Inc. stock?

4 distinct investors have filed 2 disclosed large-shareholding filings in KAYAC Inc. (3904), most recently on 2025-12-08. 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 KAYAC Inc. have?

KAYAC Inc. has 2 buy-side and 10 sell-side disclosures on record, covering ¥1.2B ($8.0M) in total reported value, spanning 2022-06-17 to 2025-12-08.

Where does StockDrifts get KAYAC Inc. 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.

KAYAC Inc. 3904

Company

株式会社カヤックKAYAC Inc.

Investors

Buys

Total Value

¥1.2B ($8.0M)

Avg Return

-50.22%

Last Filing

2025-12-08

KAYAC Inc. (3904) has 2 disclosed large-shareholding filings and 10 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥1.2B ($8.0M) in reported transaction value. The earliest filing StockDrifts holds for KAYAC Inc. is dated 2022-06-17; the most recent is 2025-12-08. 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 -50.22%, 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
2026-08-04	SELL	unknown	久場智喜 TOMOYOSHI KUBA	activist	2.2M	¥412	-3.4%	¥111M ($715K)
2026-08-04	SELL	unknown	貝畑政徳 MASANORI KAIHATA	activist	2.8M	¥412	-3.4%	¥78M ($501K)
2026-08-04	SELL	unknown	柳澤大輔 DAISUKE YANAGISAWA	activist	3.4M	¥412	-3.4%	¥78M ($501K)
2025-12-08	BUY	unknown	久場智喜 TOMOYOSHI KUBA	activist	2.5M	¥539	-20.2%	¥222M ($1.4M)
2025-12-08	SELL	unknown	久場智喜 TOMOYOSHI KUBA	activist	2.5M	¥539	+20.2%	¥225M ($1.5M)
2025-12-05	BUY	unknown	貝畑政徳 MASANORI KAIHATA	activist	3.0M	¥531	-19.0%	¥160M ($1.0M)
2025-12-05	BUY	unknown	柳澤大輔 DAISUKE YANAGISAWA	activist	3.5M	¥531	-19.0%	¥125M ($806K)
2025-12-05	BUY	unknown	柳澤大輔 DAISUKE YANAGISAWA	activist	3.5M	¥531	-19.0%	¥125M ($806K)
2025-12-05	SELL	unknown	貝畑政徳 MASANORI KAIHATA	activist	3.0M	¥531	+19.0%	¥160M ($1.0M)
2025-12-05	SELL	unknown	柳澤大輔 DAISUKE YANAGISAWA	activist	3.5M	¥531	+19.0%	¥152M ($982K)
2025-06-05	SELL	unknown	大和証券株式会社 Daiwa Securities Co.Ltd.	other	500	¥449	+4.2%	¥550M ($3.6M)
2025-04-11	SELL	unknown	柳澤大輔 DAISUKE YANAGISAWA	activist	3.8M	¥440	+2.3%	¥23M ($146K)
2024-06-06	SELL	unknown	久場智喜 TOMOYOSHI KUBA	activist	2.9M	¥663	+35.1%	¥129M ($833K)
2024-06-06	BUY	unknown	久場智喜 TOMOYOSHI KUBA	activist	2.9M	¥663	-35.1%	¥129M ($833K)
2024-03-11	SELL	unknown	柳澤大輔 DAISUKE YANAGISAWA	activist	3.8M	¥711	+39.5%	¥142M ($916K)
2024-03-11	SELL	unknown	貝畑政徳 MASANORI KAIHATA	activist	3.3M	¥711	+39.5%	¥255M ($1.6M)
2024-03-11	BUY	unknown	貝畑政徳 MASANORI KAIHATA	activist	3.3M	¥711	-39.5%	¥253M ($1.6M)
2024-03-11	BUY	unknown	柳澤大輔 DAISUKE YANAGISAWA	activist	3.8M	¥711	-39.5%	¥142M ($916K)
2023-09-05	SELL	unknown	久場智喜 Tomoyoshi Kuba	activist	3.1M	¥774	+44.4%	¥135M ($870K)
2023-05-18	SELL	unknown	久場智喜 Tomoyoshi Kuba	activist	3.3M	¥877	+51.0%	¥140M ($903K)
2022-08-24	BUY	unknown	久場智喜 Tomoyoshi Kuba	activist	3.4M	¥890	-51.7%	¥152M ($979K)
2022-08-24	BUY	unknown	久場智喜 Tomoyoshi Kuba	activist	3.4M	¥890	-51.7%	¥152M ($979K)
2022-06-21	BUY	subscription	大和証券株式会社 Daiwa Securities Co.Ltd.	other	1.3M	¥839	-48.8%	¥1.1B ($7.0M)
2022-06-17	BUY	unknown	柳澤大輔 DAISUKE YANAGISAWA	activist	4.0M	¥786	-45.3%	¥3.1B ($20.0M)
2022-06-17	BUY	unknown	柳澤大輔 DAISUKE YANAGISAWA	activist	4.0M	¥786	-45.3%	¥3.1B ($20.0M)

Frequently asked questions

Who has been buying KAYAC Inc. stock?: 4 distinct investors have filed 2 disclosed large-shareholding filings in KAYAC Inc. (3904), most recently on 2025-12-08. 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 KAYAC Inc. have?: KAYAC Inc. has 2 buy-side and 10 sell-side disclosures on record, covering ¥1.2B ($8.0M) in total reported value, spanning 2022-06-17 to 2025-12-08.
Where does StockDrifts get KAYAC Inc. 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 KAYAC Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.