Who has been buying RF Materials stock?

6 distinct insiders have filed 53 disclosed insider purchases in RF Materials (327260), most recently on 2026-07-09. 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 RF Materials have?

RF Materials has 53 buy-side and 14 sell-side disclosures on record, covering ₩4.5B ($3.1M) in total reported value, spanning 2024-03-11 to 2026-07-09.

Where does StockDrifts get RF Materials 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.

RF Materials 327260

Company

RF머트리얼즈RF Materials

Insiders

Buys

Total Value

₩4.5B ($3.1M)

Avg Return

+463.35%

Last Filing

2026-07-09

RF Materials (327260) has 53 disclosed insider purchases and 14 disclosed disposals on record, filed by 6 distinct insiders. Together those filings cover ₩4.5B ($3.1M) in reported transaction value. The earliest filing StockDrifts holds for RF Materials is dated 2024-03-11; the most recent is 2026-07-09. 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 +463.35%, 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
2026-07-27	BUY	PROGRAM	박근영 Park Geun-young	Head of Research and Development Division	2.5K	₩23,700	+26.4%	₩60M ($42K)
2026-07-27	BUY	PROGRAM	김시남 Kim Si-nam	Director of Research and Development Planning Division	26.3K	₩23,700	+26.4%	₩624M ($433K)
2026-07-27	BUY	PROGRAM	김종기 Kim Jong-gi	Each representative director	6.0K	₩23,700	+26.4%	₩142M ($99K)
2026-07-27	BUY	PROGRAM	김주현 Joohyun Kim	Internal director	4.8K	₩23,700	+26.4%	₩113M ($79K)
2026-07-27	BUY	PROGRAM	남동우 Nam Dongwoo	CEO	46.6K	₩23,700	+26.4%	₩1.1B ($767K)
2026-07-27	BUY	PROGRAM	RFHIC	-	3.7M	₩23,700	+26.4%	₩88.6B ($61.5M)
2026-07-09	BUY	유상신주취득	김시남 Kim Si-nam	Director of Research and Development Planning Division	289	₩44,650	+3.0%	₩13M ($9K)
2026-06-26	SELL	기타	RFHIC	-	-207.7K	₩52,000	+4.8%	₩10.8B ($7.5M)
2026-06-26	BUY	유상신주취득	RFHIC	-	207.7K	₩52,000	-4.8%	₩10.8B ($7.5M)
2026-06-26	SELL	기타	김시남 Kim Si-nam	Director of Research and Development Planning Division	-1.4K	₩52,000	+4.8%	₩75M ($52K)
2026-06-26	BUY	유상신주취득	김시남 Kim Si-nam	Director of Research and Development Planning Division	1.4K	₩52,000	-4.8%	₩75M ($52K)
2026-06-09	SELL	Market Sell	김종기 Kim Jong-gi	Each representative director	-353	₩71,100	+5.2%	₩25M ($17K)
2026-06-08	SELL	Market Sell	남동우 Nam Dongwoo	CEO	-94	₩68,000	+0.9%	₩6M ($4K)
2026-06-05	SELL	Market Sell	남동우 Nam Dongwoo	CEO	-2.6K	₩76,600	+12.0%	₩203M ($141K)
2026-06-05	SELL	Market Sell	김주현 Joohyun Kim	Internal director	-281	₩76,600	+12.0%	₩22M ($15K)
2026-06-05	SELL	Market Sell	박근영 Park Geun-young	Head of Research and Development Division	-149	₩76,600	+12.0%	₩11M ($8K)
2026-05-26	BUY	PROGRAM	박근영 Park Geun-young	Head of Research and Development Division	149	₩97,400	-22.7%	₩15M ($10K)
2026-05-26	BUY	PROGRAM	RFHIC	-	207.7K	₩97,400	-22.7%	₩20.2B ($14.1M)
2026-05-26	BUY	PROGRAM	김종기 Kim Jong-gi	Each representative director	353	₩97,400	-22.7%	₩34M ($24K)
2026-05-26	BUY	PROGRAM	김시남 Kim Si-nam	Director of Research and Development Planning Division	1.4K	₩97,400	-22.7%	₩141M ($98K)
2026-05-26	BUY	PROGRAM	김주현 Joohyun Kim	Internal director	281	₩97,400	-22.7%	₩27M ($19K)
2026-05-26	BUY	PROGRAM	남동우 Nam Dongwoo	CEO	2.7K	₩97,400	-22.7%	₩267M ($186K)
2026-02-11	SELL	Market Sell	김시남 Kim Si-nam	Director of Research and Development Planning Division	-9.0K	₩41,800	-10.7%	₩376M ($261K)
2026-02-11	BUY	Market Buy	김시남 Kim Si-nam	Director of Research and Development Planning Division	269	₩41,800	+10.7%	₩11M ($8K)
2026-02-11	SELL	Market Sell	김종기 Kim Jong-gi	Each representative director	-904	₩41,800	-10.7%	₩38M ($26K)
2026-02-10	SELL	Market Sell	남동우 Nam Dongwoo	Non-executive director	-31.0K	₩40,900	-13.1%	₩1.3B ($880K)
2026-02-10	SELL	Market Sell	김주현 Joohyun Kim	Internal director	-3.2K	₩40,900	-13.1%	₩130M ($90K)
2026-02-10	SELL	Market Sell	박근영 Park Geun-young	Head of Research and Development Division	-1.6K	₩40,900	-13.1%	₩65M ($45K)
2026-02-10	SELL	Market Sell	김시남 Kim Si-nam	Director of Research and Development Planning Division	-6.8K	₩40,900	-13.1%	₩276M ($192K)
2026-01-09	BUY	주식매수청구권 행사	김주현 Joohyun Kim	Internal director	400	₩23,650	+95.6%	₩9M ($7K)
2026-01-09	BUY	주식매수청구권 행사	남동우 Nam Dongwoo	Non-executive director	1.6K	₩23,650	+95.6%	₩38M ($26K)
2026-01-09	BUY	주식매수청구권 행사	김종기 Kim Jong-gi	Each CEO	5.9K	₩23,650	+95.6%	₩140M ($97K)
2026-01-07	SELL	Market Sell	김주현 Joohyun Kim	Internal director	-240	₩24,850	-86.1%	₩6M ($4K)
2025-09-22	SELL	Market Sell	김주현 Joohyun Kim	Internal director	-350	₩14,260	-224.3%	₩5M ($3K)
2025-09-19	SELL	Market Sell	김주현 Joohyun Kim	Internal director	-350	₩13,460	-243.6%	₩5M ($3K)
2025-03-24	BUY	Market Buy	RFHIC	-	4.4K	₩6,510	+610.5%	₩29M ($20K)
2025-03-21	BUY	Market Buy	RFHIC	-	2.0K	₩6,470	+614.8%	₩13M ($9K)
2025-03-20	BUY	Market Buy	RFHIC	-	2.9K	₩6,660	+594.4%	₩19M ($13K)
2025-03-19	BUY	Market Buy	RFHIC	-	10.0K	₩6,950	+565.5%	₩70M ($48K)
2025-03-18	BUY	Market Buy	RFHIC	-	6.5K	₩6,450	+617.0%	₩42M ($29K)
2025-03-14	BUY	Market Buy	RFHIC	-	5.0K	₩6,430	+619.3%	₩32M ($22K)
2025-03-13	BUY	Market Buy	RFHIC	-	234	₩6,020	+668.3%	₩1M ($978)
2025-03-12	BUY	Market Buy	RFHIC	-	4.8K	₩6,220	+643.6%	₩30M ($21K)
2025-03-11	BUY	Market Buy	RFHIC	-	10.0K	₩6,090	+659.4%	₩61M ($42K)
2025-03-10	BUY	Market Buy	RFHIC	-	2.8K	₩6,120	+655.7%	₩17M ($12K)
2025-03-07	BUY	Market Buy	RFHIC	-	2.4K	₩6,060	+663.2%	₩14M ($10K)
2025-03-05	BUY	Market Buy	RFHIC	-	5.0K	₩5,890	+685.2%	₩29M ($20K)
2025-03-04	BUY	Market Buy	RFHIC	-	5.0K	₩5,850	+690.6%	₩29M ($20K)
2025-02-28	BUY	Market Buy	RFHIC	-	5.0K	₩5,660	+717.1%	₩28M ($20K)
2025-02-27	BUY	Market Buy	RFHIC	-	10.0K	₩6,040	+665.7%	₩60M ($42K)

Showing the 50 most recent of 90 filings.

Frequently asked questions

Who has been buying RF Materials stock?: 6 distinct insiders have filed 53 disclosed insider purchases in RF Materials (327260), most recently on 2026-07-09. 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 RF Materials have?: RF Materials has 53 buy-side and 14 sell-side disclosures on record, covering ₩4.5B ($3.1M) in total reported value, spanning 2024-03-11 to 2026-07-09.
Where does StockDrifts get RF Materials 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 RF Materials. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.