Duckyang Industry Co., Ltd.

Shareholders of DY Deokyang Co., Ltd. (formerly Duckyang Industry Co., Ltd.)

DY Deokyang is listed on KOSPI, so its shares are widely held. The filings disclose only the largest shareholder, that shareholder’s related parties and any other holder of 5% or more. They do not list the full register. In the half-year report for the period ended 30 June 2026, the company names Yoon Sung-hee (윤성희) as its largest shareholder, with 6,526,420 common shares, or 20.04%.

A large-holding (5%) report filed on 31 August 2026 puts the combined stake of Yoon Sung-hee and eight specially related parties at 14,543,507 shares, or 44.66% of 32,564,980 voting shares. The previous report, dated 16 June 2026, put it at 43.63%. The increase came from on-market purchases by related parties. The related parties named in the filing are:

• Lee Kook-jin (이국진), recorded as a relative: 4,216,140 shares (12.95%)
• Logos Industry Co., Ltd. (로고스산업 주식회사), recorded as “other”: 1,995,287 shares (6.13%)
• Maejilink (매지링크), recorded as “other”: 330,000 shares (1.02%)
• four further relatives, including Yoon’s son: 1,465,660 shares in total (4.50%)
• one executive: 10,000 shares (0.03%)

Apart from the largest shareholder, the 30 June 2026 report names only two holders of 5% or more: Lee Kook-jin and Logos Industry. At 31 December 2025, minority shareholders (17,173 of the 17,182 holders on record) held 54.73% of the voting shares. The company held 137,400 treasury shares (0.42%) at 30 June 2026.

According to the business-overview section of the filings, Yoon Sung-hee became the largest shareholder in April 2014. He had been the second-largest shareholder and bought the stake held by Visteon, the US parts maker that had held shares in the company since 1999.

Ultimate beneficial ownership

No filing names an ultimate beneficial owner as such. The largest holder recorded in the filings is a natural person, Yoon Sung-hee, who holds 20.04% directly. With the related parties above, the group holds 44.66% (31 August 2026). That is a disclosed shareholder group, not an effective-ownership figure, and Korean listed-company filings apply no UBO threshold to it.

Data availability

Coverage is limited to major shareholders: DART publishes the largest shareholder, related parties and 5%+ holders for listed companies, not the full register. The fund holdings in the provider table further down this page do not match the filings. Its nine Dimensional/DFA fund rows hold 131,620 shares between them, about 0.40% of the company, but are shown as shares of 100%. For example, 42,583 shares is shown as 32.35% when the true figure is about 0.13%. None of these funds appears among the 5% holders.

Sources

• DY Deokyang half-year report for the period ended 30 June 2026, section VII (주주에 관한 사항) and consolidated note 1 (filed 2026-08-14, corrected 2026-10-12): https://dart.fss.or.kr/dsaf001/main.do?rcpNo=20261012000127 (retrieved 2026-10-22)
• Report on large holdings of shares (주식등의대량보유상황보고서), reporter Yoon Sung-hee, report date 2026-08-31: https://dart.fss.or.kr/dsaf001/main.do?rcpNo=20260831001487 (retrieved 2026-10-22)
• DY Deokyang business report for FY2025, section II (filed 2026-03-17): https://dart.fss.or.kr/dsaf001/main.do?rcpNo=20260317000660 (retrieved 2026-10-22)

Directors and officers of DY Deokyang Co., Ltd. (formerly Duckyang Industry Co., Ltd.)

The half-year report for the period ended 30 June 2026 lists six registered directors (등기임원) and one standing statutory auditor. The company has two representative directors, who each represent the company separately (각자대표):

• Yoon Sung-hee (윤성희): Representative Director and Vice Chairman (대표이사 부회장), executive director; current term ends 29 March 2028.
• Bae Woon-kyo (배운교): Representative Director and President (대표이사 사장), executive director; elected at the extraordinary general meeting of 24 June 2025; current term ends 24 June 2028.

The other registered directors are:

• Lee Kook-jin (이국진): Chairman (회장), executive director; term ends 27 March 2027.
• Ha Ran-su (하란수): Honorary Chairwoman (명예회장), executive director; term ends 29 March 2028.
• Seo Jong-hwan (서종환): independent director (독립이사) since March 2021; term ends 27 March 2027.
• Ko Joon-hyung (고준형): independent director, appointed 25 March 2026; term ends 25 March 2029.

Park Jang-woo (박장우) is the standing auditor (상근감사). He was appointed on 24 June 2025 and his term ends 24 June 2028. He had been an independent director from March 2022 until he resigned that seat on the same day.

The report also lists eight unregistered executives at division-head level and above, including a vice president who heads the research centre and senior managing directors who lead finance, management support, manufacturing, strategy and electrification, plus managing directors (상무) for purchasing development and quality.

The romanised spellings of names are Zavia’s transliterations; the filings give the names in Hangul only.

Recent officer changes

• 25 March 2026 (annual general meeting): Ko Joon-hyung was appointed independent director, and the record shows independent director Kang Moon-chul (강문철) as having resigned.
• 23 September 2025: Representative Director Moon Kyung-ho (문경호) resigned. He had been elected at the general meeting of 25 March 2025.
• 24 June 2025 (extraordinary general meeting): Bae Woon-kyo was elected representative director and Park Jang-woo was elected auditor.

Data availability

Coverage is full for registered directors and auditors: Korean periodic reports give roles, registered or unregistered status, terms and five years of changes. Nationality is not disclosed in Korean filings. Birth year and month are published in the filings but are deliberately not reproduced here.

Sources

• DY Deokyang half-year report for the period ended 30 June 2026, sections I-2 (회사의 연혁) and VIII-1 (임원 및 직원 등의 현황) (filed 2026-08-14, corrected 2026-10-12): https://dart.fss.or.kr/dsaf001/main.do?rcpNo=20261012000127 (retrieved 2026-10-22)
• KRX KIND listed-company list (representative directors), KOSPI market: https://kind.krx.co.kr/corpgeneral/corpList.do?method=download&searchType=13&marketType=stockMkt (retrieved 2026-10-22)

Group structure of DY Deokyang Co., Ltd. (formerly Duckyang Industry Co., Ltd.)

DY Deokyang sits at the top of its own small group. Its largest shareholder is a natural person (see the shareholders section), and its filings name no parent company. At 30 June 2026 it consolidated three subsidiaries: one in the United States and two in Korea. It also held a 20% associate in Indonesia. Two Chinese entities it previously held, a 60%-owned subsidiary in Beijing and a 50% joint venture in Shenyang, were liquidated during the first half of 2026. The Beijing company was deconsolidated, and the company reported a consolidated disposal loss of KRW 5,266 million on it. The company’s affiliate list (계열회사 현황) at 30 June 2026 contains exactly these four unlisted companies: the three subsidiaries and the Indonesian associate.

Verified corporate relationships

Recent structural changes

• First half of 2026: the Beijing subsidiary and the Shenyang joint venture were both liquidated. The Beijing company had been acquired in April 2015, when the company bought Hyundai Mobis’s stake in and management control of Beijing Mobis Zhongche. Chongqing Deokyang Zhongche was merged into it in May 2023.
• First half of 2026: the company invested a further KRW 19,550 million in DY Deokyang America Inc. for 1,300,000 new shares, keeping its 100% holding.
• October 2025: Duckyang America Inc. was renamed DY Deokyang America Inc. This followed the parent’s own April 2025 change of name from Duckyang Industry Co., Ltd. to DY Deokyang Co., Ltd.

Data availability

Coverage is full for this group. Korean periodic reports give the consolidated subsidiaries with share percentages, equity-accounted investees, and the corporate registration numbers of domestic affiliates. The filings do not give registration numbers for the US, Indonesian and Chinese entities. The provider group tree further down this page omits DY Deokyang America and PT Varia Deokyang Indonesia, still shows the liquidated Beijing company as a subsidiary, and gives DNC Battery Solution a 10-digit number (7228702676) that is not its corporate registration number. That 10-digit number could not be verified.

Sources

• DY Deokyang half-year report for the period ended 30 June 2026: consolidated note 1, separate note 10, section XII-1/2/3 (상세표) and section I-2 (연혁) (filed 2026-08-14, corrected 2026-10-12): https://dart.fss.or.kr/dsaf001/main.do?rcpNo=20261012000127 (retrieved 2026-10-22)
• DY Deokyang business report for FY2025, section II (filed 2026-03-17): https://dart.fss.or.kr/dsaf001/main.do?rcpNo=20260317000660 (retrieved 2026-10-22)
• DY Deokyang company website, business sites page: https://dydeokyang.co.kr/business-place/ (retrieved 2026-10-22)