Who has been buying Day One Company stock?

4 distinct insiders have filed 14 disclosed insider purchases in Day One Company (373160), most recently on 2026-01-27. 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 Day One Company have?

Day One Company has 14 buy-side and 0 sell-side disclosures on record, covering ₩60M ($41K) in total reported value, spanning 2025-01-24 to 2026-01-27.

Where does StockDrifts get Day One Company insider data?

From DART D001/D002 insider disclosures — the official filing system run by the Financial Supervisory Service (Korea). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from DART.

Do insider buys in Korean stocks predict returns?

Not uniformly. StockDrifts analysed 170,720 share-count changes across 56,930 Korean DART filings using cross-sectional alpha at fixed forward horizons, and found returns concentrated in particular signal tiers rather than in insider buying generally.

Day One Company 373160

Company

데이원컴퍼니Day One Company

Insiders

Buys

Total Value

₩60M ($41K)

Avg Return

-14.46%

Last Filing

2026-01-27

Day One Company (373160) has 14 disclosed insider purchases and 0 disclosed disposals on record, filed by 4 distinct insiders. Together those filings cover ₩60M ($41K) in reported transaction value. The earliest filing StockDrifts holds for Day One Company is dated 2025-01-24; the most recent is 2026-01-27. All of it is parsed from DART D001/D002 insider disclosures, the official disclosure system operated by the Financial Supervisory Service (Korea). Across these filings the average return since disclosure is -14.46%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent insider trades

Date	Type	Source	Insider	Position	Shares	Price at filing	Return	Value
2026-01-27	BUY	Market Buy	이강민 Kangmin Lee	CEO	1.0K	₩4,505	+6.9%	₩5M ($3K)
2026-01-12	BUY	Market Buy	신해동 Sinhae-dong	Internal director	98	₩4,580	+5.1%	₩449K ($312)
2026-01-09	BUY	Market Buy	신해동 Sinhae-dong	Internal director	1.1K	₩4,720	+2.0%	₩5M ($4K)
2026-01-07	BUY	Market Buy	이강민 Kangmin Lee	CEO	293	₩4,765	+1.1%	₩1M ($970)
2025-12-05	BUY	Market Buy	이강민 Kangmin Lee	CEO	175	₩5,330	-9.7%	₩933K ($648)
2025-11-05	BUY	Market Buy	이강민 Kangmin Lee	CEO	200	₩4,945	-2.6%	₩989K ($687)
2025-10-15	BUY	주식매수선택권	신해동 Sinhae-dong	Internal director	30.0K	₩5,720	-15.8%	₩172M ($119K)
2025-10-15	BUY	주식매수선택권	김지훈 Jihoon Kim	Fast Campus/B2B/B2G/Zero Base General Manager	5.4K	₩5,720	-15.8%	₩31M ($22K)
2025-10-14	BUY	Market Buy	이강민 Kangmin Lee	CEO	36	₩5,660	-14.9%	₩204K ($142)
2025-10-13	BUY	Market Buy	이강민 Kangmin Lee	CEO	129	₩5,860	-17.8%	₩756K ($525)
2025-08-22	BUY	Market Buy	이강민 Kangmin Lee	CEO	173	₩5,860	-17.8%	₩1M ($704)
2025-08-05	BUY	Market Buy	이강민 Kangmin Lee	CEO	166	₩6,190	-22.2%	₩1M ($714)
2025-03-31	SELL	임원퇴임	HSU SHIEN YU	CIC representative	-75.0K	₩5,930	+18.8%	₩445M ($309K)
2025-03-26	BUY	PROGRAM	신해동 Sinhae-dong	Internal director	12.0K	₩6,380	-24.5%	₩77M ($53K)
2025-03-26	BUY	PROGRAM	이경민 Kyungmin Lee	exaggeration	1.0K	₩6,380	-24.5%	₩7M ($5K)
2025-03-26	BUY	PROGRAM	심승건 Shim Seung-gun	CTO	3.8K	₩6,380	-24.5%	₩24M ($17K)
2025-03-26	BUY	PROGRAM	김지훈 Jihoon Kim	Fast Campus/B2B/B2G/Zero Base General Manager	20.0K	₩6,380	-24.5%	₩128M ($89K)
2025-03-26	BUY	PROGRAM	HSU SHIEN YU	CIC representative	35.0K	₩6,380	-24.5%	₩223M ($155K)
2025-03-26	BUY	PROGRAM	김동혁 Donghyuk Kim	(CIC representative)	22.0K	₩6,380	-24.5%	₩140M ($97K)
2025-02-07	BUY	Market Buy	이강민 Kangmin Lee	CEO	1.5K	₩7,200	-33.1%	₩11M ($8K)
2025-02-07	BUY	Market Buy	박지웅 Jiwoong Park	Chairman of the Board	1.5K	₩7,200	-33.1%	₩11M ($8K)
2025-02-07	BUY	Market Buy	신해동 Sinhae-dong	CIC representative	1.5K	₩7,200	-33.1%	₩11M ($8K)
2025-02-07	BUY	Market Buy	이경민 Kyungmin Lee	exaggeration	1.5K	₩7,200	-33.1%	₩11M ($8K)
2025-01-24	BUY	신규상장	박지웅 Jiwoong Park	Chairman of the Board	324.0K	₩7,800	-38.3%	₩2.5B ($1.8M)
2025-01-24	BUY	신규상장	HSU SHIEN YU	CIC representative	40.0K	₩7,800	-38.3%	₩312M ($217K)
2025-01-24	BUY	신규상장	패스트파이브 Fast Five	-	2.4M	₩7,800	-38.3%	₩18.3B ($12.7M)
2025-01-24	BUY	신규상장	김동혁 Donghyuk Kim	CIC representative	22.0K	₩7,800	-38.3%	₩172M ($119K)
2025-01-24	BUY	신규상장	원더홀딩스 Wonder Holdings	-	1.5M	₩7,800	-38.3%	₩11.5B ($8.0M)
2025-01-24	BUY	신규상장	심승건 Shim Seung-gun	CTO	11.3K	₩7,800	-38.3%	₩88M ($61K)
2025-01-24	BUY	신규상장	이경민 Kyungmin Lee	Assistant Managing Director	59.0K	₩7,800	-38.3%	₩460M ($319K)
2025-01-24	BUY	신규상장	김지훈 Jihoon Kim	CIC representative	47.0K	₩7,800	-38.3%	₩367M ($255K)
2025-01-24	BUY	신규상장	신해동 Sinhae-dong	Internal Director (CFO)	42.0K	₩7,800	-38.3%	₩328M ($228K)
2025-01-24	BUY	신규상장	이강민 Kangmin Lee	CEO	396.4K	₩7,800	-38.3%	₩3.1B ($2.1M)

Frequently asked questions

Who has been buying Day One Company stock?: 4 distinct insiders have filed 14 disclosed insider purchases in Day One Company (373160), most recently on 2026-01-27. 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 Day One Company have?: Day One Company has 14 buy-side and 0 sell-side disclosures on record, covering ₩60M ($41K) in total reported value, spanning 2025-01-24 to 2026-01-27.
Where does StockDrifts get Day One Company insider data?: From DART D001/D002 insider disclosures — the official filing system run by the Financial Supervisory Service (Korea). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from DART.
Do insider buys in Korean stocks predict returns?: Not uniformly. StockDrifts analysed 170,720 share-count changes across 56,930 Korean DART filings using cross-sectional alpha at fixed forward horizons, and found returns concentrated in particular signal tiers rather than in insider buying generally.

Source filings

Every trade listed above is disclosed in DART D001/D002 insider disclosures, filed with the Financial Supervisory Service (Korea). View the original DART filings for Day One Company. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.