Who has been buying Joy Works & Co. stock?

3 distinct insiders have filed 42 disclosed insider purchases in Joy Works & Co. (309930), most recently on 2026-05-28. 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 Joy Works & Co. have?

Joy Works & Co. has 42 buy-side and 0 sell-side disclosures on record, covering ₩1.9B ($1.3M) in total reported value, spanning 2018-12-18 to 2026-05-28.

Where does StockDrifts get Joy Works & Co. 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.

Joy Works & Co. 309930

Company

조이웍스앤코Joy Works & Co.

Insiders

Buys

Total Value

₩1.9B ($1.3M)

Avg Return

-33.86%

Last Filing

2026-05-28

Joy Works & Co. (309930) has 42 disclosed insider purchases and 0 disclosed disposals on record, filed by 3 distinct insiders. Together those filings cover ₩1.9B ($1.3M) in reported transaction value. The earliest filing StockDrifts holds for Joy Works & Co. is dated 2018-12-18; the most recent is 2026-05-28. 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 -33.86%, 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
2026-08-07	BUY	Market Buy	이문기 Moongi Lee	vice president	22.2K	₩927	+0.0%	₩21M ($15K)
2026-08-06	BUY	Market Buy	이문기 Moongi Lee	vice president	11.0K	₩878	+5.6%	₩10M ($7K)
2026-08-05	BUY	Market Buy	이문기 Moongi Lee	vice president	3.5K	₩938	-1.2%	₩4M ($2K)
2026-08-04	BUY	Market Buy	이문기 Moongi Lee	vice president	11.3K	₩961	-3.5%	₩10M ($7K)
2026-07-20	BUY	신규선임	유지연 Yoo Ji-yeon	Outside Director	57.4K	₩798	+38.2%	₩46M ($32K)
2026-05-28	BUY	무상신주취득	조이웍스 Joyworks	-	1.9M	₩3,650	-52.1%	₩7.0B ($4.9M)
2026-05-28	BUY	무상신주취득	조성환 Seonghwan Cho	Internal director	241.2K	₩3,650	-52.1%	₩880M ($611K)
2026-05-28	BUY	무상신주취득	이문기 Moongi Lee	vice president	24.0K	₩3,650	-52.1%	₩88M ($61K)
2026-05-11	SELL	주식병합	조이웍스 Joyworks	-	-2.6M	₩2,210	+0.0%	₩5.6B ($3.9M)
2026-05-11	SELL	주식병합	조성환 Seonghwan Cho	Internal director	-321.5K	₩2,210	+0.0%	₩711M ($493K)
2026-05-11	SELL	주식병합	이문기 Moongi Lee	vice president	-32.0K	₩2,210	+0.0%	₩71M ($49K)
2026-04-03	BUY	Market Buy	조성환 Seonghwan Cho	Internal director	10.4K	₩946	+81.9%	₩10M ($7K)
2026-04-01	BUY	Market Buy	조성환 Seonghwan Cho	Internal director	10.9K	₩854	+101.5%	₩9M ($6K)
2026-03-31	BUY	Market Buy	조성환 Seonghwan Cho	Internal director	10.6K	₩835	+106.1%	₩9M ($6K)
2026-03-30	BUY	Market Buy	조성환 Seonghwan Cho	Internal director	545	₩815	+111.2%	₩444K ($308)
2026-03-30	BUY	Market Buy	조성환 Seonghwan Cho	Internal director	595	₩815	+111.2%	₩485K ($337)
2026-03-30	BUY	Market Buy	조성환 Seonghwan Cho	Internal director	1.7K	₩815	+111.2%	₩1M ($962)
2026-03-30	BUY	Market Buy	조성환 Seonghwan Cho	Internal director	1.0K	₩815	+111.2%	₩815K ($566)
2025-12-12	BUY	Market Buy	조성환 Seonghwan Cho	CEO	8.2K	₩1,920	-49.0%	₩16M ($11K)
2025-12-11	BUY	Market Buy	이문기 Moongi Lee	vice president	40.0K	₩1,926	-49.1%	₩77M ($54K)
2025-12-11	BUY	Market Buy	조성환 Seonghwan Cho	CEO	311.8K	₩1,926	-49.1%	₩601M ($417K)
2025-08-14	BUY	Market Buy	조성환 Seonghwan Cho	CEO	9.8K	₩2,870	-65.8%	₩28M ($19K)
2025-08-13	BUY	Market Buy	조성환 Seonghwan Cho	CEO	15.4K	₩2,775	-64.7%	₩43M ($30K)
2025-08-11	BUY	Market Buy	조성환 Seonghwan Cho	CEO	333	₩2,755	-64.4%	₩917K ($637)
2025-08-08	BUY	Market Buy	조성환 Seonghwan Cho	CEO	4.3K	₩2,950	-66.8%	₩13M ($9K)
2025-08-07	BUY	Market Buy	조성환 Seonghwan Cho	CEO	4.8K	₩3,000	-67.3%	₩14M ($10K)
2025-08-06	BUY	Market Buy	조성환 Seonghwan Cho	CEO	318	₩2,945	-66.7%	₩937K ($650)
2025-08-05	BUY	Market Buy	조성환 Seonghwan Cho	CEO	321	₩3,010	-67.4%	₩966K ($671)
2025-08-04	BUY	Market Buy	조성환 Seonghwan Cho	CEO	1.4K	₩3,050	-67.9%	₩4M ($3K)
2025-08-01	BUY	Market Buy	조성환 Seonghwan Cho	CEO	1.6K	₩3,000	-67.3%	₩5M ($3K)
2025-07-31	BUY	Market Buy	조성환 Seonghwan Cho	CEO	696	₩3,070	-68.1%	₩2M ($1K)
2025-07-30	BUY	Market Buy	조성환 Seonghwan Cho	CEO	944	₩3,040	-67.8%	₩3M ($2K)
2025-07-29	BUY	Market Buy	조성환 Seonghwan Cho	CEO	6.3K	₩3,060	-68.0%	₩19M ($13K)
2025-07-28	BUY	전환사채의권리행사	조이웍스 Joyworks	-	3.2M	₩3,090	-68.3%	₩9.9B ($6.8M)
2025-07-28	SELL	전환등	조이웍스 Joyworks	-	-3.2M	₩3,090	+68.3%	₩9.9B ($6.8M)
2025-07-25	BUY	CB인수	조이웍스 Joyworks	-	3.2M	₩3,150	-68.9%	₩10.0B ($7.0M)
2025-07-25	SELL	장외매도	최인순 Choi In-soon	-	-1.2M	₩3,150	+68.9%	₩3.7B ($2.6M)
2025-04-02	BUY	Market Buy	나형균 Na Hyeong-gyun	president	10.0K	₩1,871	-47.6%	₩19M ($13K)
2024-12-20	BUY	Market Buy	나형균 Na Hyeong-gyun	president	7.1K	₩2,400	-59.2%	₩17M ($12K)
2024-12-19	BUY	Market Buy	나형균 Na Hyeong-gyun	president	6.6K	₩2,565	-61.8%	₩17M ($12K)
2024-12-17	BUY	Market Buy	나형균 Na Hyeong-gyun	president	7.1K	₩2,605	-62.4%	₩19M ($13K)
2024-12-16	BUY	Market Buy	나형균 Na Hyeong-gyun	president	8.4K	₩2,620	-62.6%	₩22M ($15K)
2024-12-13	BUY	Market Buy	나형균 Na Hyeong-gyun	president	9.2K	₩2,475	-60.4%	₩23M ($16K)
2024-12-12	BUY	Market Buy	나형균 Na Hyeong-gyun	president	12.6K	₩2,455	-60.1%	₩31M ($21K)
2024-12-10	BUY	Market Buy	나형균 Na Hyeong-gyun	president	12.1K	₩2,425	-59.6%	₩29M ($20K)
2024-12-09	BUY	Market Buy	나형균 Na Hyeong-gyun	president	11.9K	₩2,150	-54.4%	₩26M ($18K)
2024-12-06	BUY	Market Buy	나형균 Na Hyeong-gyun	president	11.2K	₩2,375	-58.7%	₩27M ($18K)
2024-12-05	BUY	Market Buy	나형균 Na Hyeong-gyun	president	3.4K	₩2,525	-61.2%	₩9M ($6K)
2024-12-04	BUY	Market Buy	나형균 Na Hyeong-gyun	president	224	₩2,550	-61.6%	₩571K ($397)
2024-12-03	BUY	Market Buy	나형균 Na Hyeong-gyun	president	30.6K	₩2,675	-63.4%	₩82M ($57K)

Showing the 50 most recent of 58 filings.

Frequently asked questions

Who has been buying Joy Works & Co. stock?: 3 distinct insiders have filed 42 disclosed insider purchases in Joy Works & Co. (309930), most recently on 2026-05-28. 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 Joy Works & Co. have?: Joy Works & Co. has 42 buy-side and 0 sell-side disclosures on record, covering ₩1.9B ($1.3M) in total reported value, spanning 2018-12-18 to 2026-05-28.
Where does StockDrifts get Joy Works & Co. 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 Joy Works & Co.. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.