Annual Large Business Group Status Disclosure (FY2025) — Doosan Tesna

Summary

This is the annual large business group status disclosure as a member of the Doosan Group, covering company overview, financials, and ESG governance. FY2025 standalone results show revenue of KRW 303.9 billion with an operating loss of KRW 0.9 billion but net income of KRW 1.5 billion, while debt-to-equity stood at 61.02% with borrowings of KRW 200.5 billion. Notably, Cho Hoon was newly appointed as co-CEO alongside Kim Yoon-gun effective March 31, 2026, and Choi Ji-gwang joined as a new outside director and audit committee member. The board also approved significant capex including a Pyeongtaek new plant construction plan revision and additional machinery investments for new business response.

Historical Impact

4 past Large Business Group Filing events at Doosan Tesna

Median +5d

-2.96%

Range

-7.21% to 0.00%

Positive outcomes

0/4

Filed	P₀	P₊₅	+5d
Feb 27, 2026	₩68,000	₩63,100	-7.21%
Nov 28, 2025	₩44,800	₩44,300	-1.12%

Full Translation

Business Group Status Disclosure (Annual - Individual Company) Doosan Tesna Status Disclosure for Member Company of Large Business Group - Business Group Name: Doosan - Group Designated Person (Identical Person): Park Jeong-won - Group Representative Company: Doosan Corporation - Filing Company: Doosan Tesna Co., Ltd. - Contact: Kim Seon-ju (Team Leader), Tel: 031-5179-4826 <Reference> The representative company of the Doosan business group disclosure is Doosan Corporation. The overall status disclosure of the Doosan group is identical to that filed by Doosan Corporation, so please refer to the Doosan business group status disclosure filed by Doosan Corporation. 1. General Status (1) Company Overview (as of this year's designation date, unit: persons) - Company: Doosan Tesna Co., Ltd. (Non-financial) - Representatives: Kim Yoon-gun, Cho Hoon - Establishment Date: 2002.09.06 - Group Affiliation Date: 2022.06.01 - Industry: C2611 (Manufacture of electronic integrated circuits) - Employees: 786 - Listed Status: Listed - Fiscal Year-end: 2025.12.31 (1-1) Business Activities - Industry: C2611 (Manufacture of electronic integrated circuits) - Main Products/Business: Semiconductor manufacturing-related testing (2) Company Financial Status (based on separate balance sheet, as of end of prior fiscal year, unit: KRW million, %) - Current Assets: 160,045 - Cash & Cash Equivalents (within current assets): 109,547 - Non-current Assets: 543,731 - Total Assets: 703,776 - Current Liabilities: 116,831 - Non-current Liabilities: 149,868 - Total Liabilities: 266,699 - Borrowings (within total liabilities): 200,450 - Capital Stock: 9,664 - Total Equity: 437,077 - Debt-to-Equity Ratio: 61.02% (3) Company Profit/Loss Status (based on separate income statement, unit: KRW million) - Revenue (or operating revenue): 303,874 - Operating Profit: -941 - Other Income, etc.: 19,654 - Other Expenses, etc.: 17,253 - Interest Expense (within other expenses): 11,757 - Net Income: 1,510 (4) Foreign Affiliate Status: Not applicable (5) Affiliate Change Status: Not applicable 2. Executive and Board Operation Status [ESG] (1) Executive Status [ESG] (registered executives, as of this year's designation date) - Kim Yoon-gun: Representative Director (Chairman of the Board), Inaugurated 2022.04.27, Registered 2022.05.10, Term expires 2028.03.31, Background: Vice President of Doosan Corporation, Reappointed - Kim Yoon-gun: Inside Director, same dates, Reappointed - Cho Hoon: Representative Director, Inaugurated 2026.03.31, Registered 2026.04.02, Term expires 2029.03.31, Background: Head of Finance Team at Doosan Tesna, Newly appointed - Cho Hoon: Inside Director, same dates, Newly appointed - Jang Jae-hyung: Outside Director, 2022.04.27, term to 2028.03.31, concurrent at Woori Card, Background: Tax Attorney at Yulchon LLC, Reappointed - Jang Jae-hyung: Audit Committee Member (Chair of Audit Committee), same dates, Reappointed - Kim Hyun-jae: Outside Director, same dates, concurrent at KCTech, Background: Professor at Yonsei University Dept. of Electrical and Electronic Engineering, Reappointed - Kim Hyun-jae: Audit Committee Member, same dates, Reappointed - Seo Seok-ho: Outside Director, same dates, concurrent at TIDESQUARE, Background: Attorney at Kim & Chang, Reappointed - Seo Seok-ho: Audit Committee Member (Chair of Compensation Committee), same dates, Reappointed - Choi Ji-gwang: Outside Director, Inaugurated 2026.03.31, Registered 2026.04.02, Term expires 2029.03.31, Background: Director at Hangil Accounting Corp., concurrently Outside Director at Doosan Bobcat, Newly appointed - Choi Ji-gwang: Audit Committee Member, same dates, Newly appointed * Term expiry dates are based on the closing of the annual shareholders' meeting in the year of expiry, reflecting this year's AGM date (2026.03.31). (2) Board, Board Committees, Shareholders' Meeting Systems, and Minority Shareholder Rights [ESG] A. Board Operation Status Directors (Kim Do-won, Kim Yoon-gun, Jang Jae-hyung, Seo Seok-ho, Kim Hyun-jae): - 2025.10.15: (1) Tangible asset (machinery) investment — Approved; (2) Facility loan refinancing — Approved - 2025.10.27: (1) Executive appointment — Approved - 2025.11.10: (1) Amendment of executive officer and advisor management regulations — Approved; (2) Appointment of compliance support officer — Approved - 2026.02.10: (1) Approval of FY24 financial statements and business report — Approved; (2) Approval of 2026 safety and health plan — Approved; (3) Approval of treasury stock disposal for executive RSU payment — Approved - 2026.03.10: (1) Convening of 24th AGM and approval of agenda items — Approved; (2) Approval of electronic voting system adoption — Approved Directors (Kim Yoon-gun, Cho Hoon, Jang Jae-hyung, Seo Seok-ho, Kim Hyun-jae, Choi Ji-gwang): - 2026.03.31: (1) Appointment of Board Chair and Convener — Approved; (2) Appointment of Representative Director — Approved; (3) Approval of amendments to board committee regulations — Approved; (4) Appointment of Compensation Committee members — Approved - 2026.04.28: (1) Approval of tangible asset (machinery) investment — Approved; (1-1) Machinery investment for new business response — Approved; (1-2) Machinery investment — Approved; (1-3) Change of machinery investment approval — Approved; (2) Approval of changes to Pyeongtaek new plant construction plan — Approved; (3) Approval of compliance management policy enactment — Approved B. Board Committees Audit Committee (Jang Jae-hyung, Seo Seok-ho, Kim Hyun-jae): - 2025.11.10: Enactment of auditor selection regulations — Approved - 2025.12.10: Auditor selection — Approved - 2026.03.10: Approval of auditor's audit report and opinion on internal monitoring devices — Approved Audit Committee (Jang Jae-hyung, Seo Seok-ho, Kim Hyun-jae, Choi Ji-gwang): - 2026.04.28: 2025 post-audit evaluation of auditor — Approved Compensation Committee (Jang Jae-hyung, Seo Seok-ho, Kim Hyun-jae): - 2025.12.10: Change of delivery method for executive RSU granted shares — Approved - 2026.02.10: Confirmation of executive RSU payment — Approved - 2026.03.10: Pre-approval of director compensation limit — Approved Compensation Committee (Jang Jae-hyung, Seo Seok-ho, Kim Hyun-jae, Choi Ji-gwang): - 2026.04.28: Granting of executive RSUs — Approved C. Other Systems Related to Voting Rights at Shareholders' Meetings - Cumulative voting / Written voting / Electronic voting: Adoption and implementation status and general shareholder voting ratios (for non-financial company Doosan Tesna) [Translation truncated]