Who has been buying TSI stock?

7 distinct insiders have filed 152 disclosed insider purchases in TSI (277880), most recently on 2026-06-27. 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 TSI have?

TSI has 152 buy-side and 14 sell-side disclosures on record, covering ₩1.4B ($952K) in total reported value, spanning 2023-10-05 to 2026-06-27.

Where does StockDrifts get TSI 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.

TSI 277880

Company

티에스아이TSI

Insiders

Buys

152

Total Value

₩1.4B ($952K)

Avg Return

-15.55%

Last Filing

2026-06-27

TSI (277880) has 152 disclosed insider purchases and 14 disclosed disposals on record, filed by 7 distinct insiders. Together those filings cover ₩1.4B ($952K) in reported transaction value. The earliest filing StockDrifts holds for TSI is dated 2023-10-05; the most recent is 2026-06-27. 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 -15.55%, 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
2026-07-22	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,000	+2.3%	₩3M ($2K)
2026-07-22	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,000	+2.3%	₩3M ($2K)
2026-07-22	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,000	+2.3%	₩3M ($2K)
2026-07-22	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,000	+2.3%	₩3M ($2K)
2026-07-22	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,000	+2.3%	₩3M ($2K)
2026-07-22	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,000	+2.3%	₩3M ($2K)
2026-07-22	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,000	+2.3%	₩3M ($2K)
2026-07-22	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,000	+2.3%	₩3M ($2K)
2026-07-22	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,000	+2.3%	₩3M ($2K)
2026-07-22	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,000	+2.3%	₩3M ($2K)
2026-06-27	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.3K	₩3,495	-3.7%	₩5M ($3K)
2026-06-27	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.5K	₩3,495	-3.7%	₩5M ($4K)
2026-06-26	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,115	+0.0%	₩4M ($3K)
2026-06-26	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,115	+0.0%	₩4M ($3K)
2026-06-26	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,115	+0.0%	₩4M ($3K)
2026-06-26	BUY	Market Buy	이창원 Lee Chang-won	vice president	100	₩3,115	+8.0%	₩312K ($216)
2026-06-26	BUY	Market Buy	이창원 Lee Chang-won	vice president	300	₩3,115	+8.0%	₩935K ($649)
2026-06-26	BUY	Market Buy	이창원 Lee Chang-won	vice president	400	₩3,115	+8.0%	₩1M ($865)
2026-06-26	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,115	+8.0%	₩4M ($3K)
2026-06-26	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,115	+8.0%	₩4M ($3K)
2026-06-26	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.7K	₩3,115	+8.0%	₩5M ($4K)
2026-06-24	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,485	-10.6%	₩5M ($3K)
2026-06-24	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,485	-10.6%	₩5M ($3K)
2026-06-24	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,485	-10.6%	₩5M ($3K)
2026-06-21	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,725	-16.4%	₩5M ($4K)
2026-06-20	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,725	-16.4%	₩5M ($4K)
2026-06-19	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,880	-19.7%	₩5M ($4K)
2026-06-18	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,970	-21.5%	₩6M ($4K)
2026-06-18	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.3K	₩3,970	-21.5%	₩5M ($4K)
2026-06-18	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,970	-21.5%	₩6M ($4K)
2026-06-18	BUY	Market Buy	이창원 Lee Chang-won	vice president	1.4K	₩3,970	-21.5%	₩6M ($4K)
2026-06-10	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,790	+6.5%	₩4M ($3K)
2026-06-10	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,790	+6.5%	₩4M ($3K)
2026-06-10	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,790	+6.5%	₩4M ($3K)
2026-06-10	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,790	+6.5%	₩4M ($3K)
2026-06-10	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,790	+6.5%	₩4M ($3K)
2026-06-10	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,790	+6.5%	₩4M ($3K)
2026-06-10	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,790	+6.5%	₩4M ($3K)
2026-06-10	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,790	+6.5%	₩4M ($3K)
2026-06-10	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,790	+6.5%	₩4M ($3K)
2026-06-10	BUY	Market Buy	표인식 Table recognition	CEO	1.0K	₩3,790	+6.5%	₩4M ($3K)
2026-05-19	BUY	Market Buy	우철호 Woo Cheol-ho	vice president	300	₩4,725	+5.3%	₩1M ($984)
2026-05-19	BUY	Market Buy	우철호 Woo Cheol-ho	vice president	2.7K	₩4,725	+5.3%	₩13M ($9K)
2026-05-14	BUY	Market Buy	표인식 Table recognition	CEO	5.0K	₩5,320	-3.2%	₩27M ($18K)
2026-05-14	BUY	Market Buy	표인식 Table recognition	CEO	622	₩5,320	-3.2%	₩3M ($2K)
2026-05-14	BUY	Market Buy	표인식 Table recognition	CEO	4.4K	₩5,320	-3.2%	₩23M ($16K)
2026-05-12	BUY	Market Buy	신상문 Shin Sang-moon	president	223	₩5,480	-6.0%	₩1M ($849)
2026-05-12	BUY	Market Buy	신상문 Shin Sang-moon	president	5.5K	₩5,480	-6.0%	₩30M ($21K)
2026-05-12	BUY	Market Buy	신상문 Shin Sang-moon	president	3.3K	₩5,480	-6.0%	₩18M ($12K)
2026-05-12	BUY	Market Buy	신상문 Shin Sang-moon	president	526	₩5,480	-6.0%	₩3M ($2K)

Showing the 50 most recent of 194 filings.

Frequently asked questions

Who has been buying TSI stock?: 7 distinct insiders have filed 152 disclosed insider purchases in TSI (277880), most recently on 2026-06-27. 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 TSI have?: TSI has 152 buy-side and 14 sell-side disclosures on record, covering ₩1.4B ($952K) in total reported value, spanning 2023-10-05 to 2026-06-27.
Where does StockDrifts get TSI 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 TSI. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.