Completion report on merger, etc. (merger)

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Completion report on merger, etc. 6.0 DY Co., Ltd. Completion report on merger, etc. (merger)

To the Commissioner of the Financial Supervisory Service July 3, 2026

Company name: DY Co., Ltd. Representative Director: Kim Jin-ho Head office address: 36, Namdongseo-ro 362beon-gil, Namdong-gu, Incheon (Namchon-dong) (Tel) 032-810-4100 (Website) https://www.dy.co.kr Preparer: (Title) Head of Finance Office (Name) Kim Beop-mun (Tel) 032-810-4100

I. Schedule Category: Date; Remarks Board resolution date for the merger agreement: February 27, 2026; - Material event report filing: February 27, 2026; - Public notice of record date for shareholder confirmation: March 30, 2026; Posted on the Company's website Merger agreement date: March 30, 2026; - Shareholder confirmation record date: April 14, 2026; - Small-scale merger public notice: April 13, 2026; Posted on the Company's website Period for receiving notices of objection to the merger -- start date: April 15, 2026; - -- end date: April 29, 2026; - Board resolution approving the merger: May 8, 2026; In lieu of a general shareholders' meeting Public notice inviting creditor objections: May 15, 2026; Posted on the Company's website Period for creditor objections -- start date: May 18, 2026; - -- end date: June 30, 2026; - Merger effective date: July 1, 2026; - Board resolution on merger completion report: July 2, 2026; In lieu of a reporting general meeting Public notice of merger completion report: July 2, 2026; Posted on the Company's website Expected merger registration date: July 3, 2026; -

II. Changes in the equity holdings of the largest shareholder, etc. DY Co., Ltd. holds 100% of the equity of DY Innovate Co., Ltd., and since the merger ratio is 1:0 with no new merger shares issued (a no-capital-increase merger), there is no change in the equity holdings of the largest shareholder, etc. following the merger.

III. Exercise of appraisal rights As this merger is a small-scale merger under Article 527-3 of the Commercial Act, no appraisal rights are granted. In addition, pursuant to Article 527-3 of the Commercial Act, notices of objection to the merger were received from April 15, 2026 to April 29, 2026; a total of 339 shareholders notified their objection to the merger, representing 424,343 shares (1.61% of total issued shares).

IV. Creditor protection matters The surviving company, DY Co., Ltd., and the dissolving company, DY Innovate Co., Ltd., issued a public notice inviting creditor objections on May 15, 2026, and no creditor raised an objection by the close of the objection period on June 30, 2026. In addition, no decision has been made to repay any debt or provide substantial collateral in connection with this matter.

V. Status of related litigation As of the date of this report, there is no litigation related to this merger that could affect its validity.

VI. Matters concerning new share allotment, etc. DY Co., Ltd. holds 100% of the equity of DY Innovate Co., Ltd., and since the merger ratio is 1:0, this is a no-capital-increase merger under which no new merger shares are issued. In addition, no separate merger consideration was paid.

VII. Summary financial information before and after the [merger, etc.] (Unit: KRW million) Category: Before merger -- DY Co., Ltd. (surviving company); Before merger -- DY Innovate Co., Ltd. (dissolving company); After merger -- DY Co., Ltd. Current assets: 13,949; 72,385; 85,128 Non-current assets: 221,326; 33,039; 218,962 Total assets: 235,275; 105,424; 304,090 Current liabilities: 14,309; 38,354; 51,428 Non-current liabilities: 6,126; 9,890; 15,914 Total liabilities: 20,435; 48,244; 67,342 Capital stock: 13,160; 2,000; 13,160 Capital surplus: 96,177; 33,273; 96,177 Capital adjustments: -; -; - Accumulated other comprehensive income: -; -; - Retained earnings: 105,503; 21,907; 127,411 Total equity: 214,840; 57,180; 236,748 Total liabilities and equity: 235,275; 105,424; 304,090

(*1) The summary financial information above is based on the separate statement of financial position as of March 31, 2026, the most recent financial statements available as of the filing date of this merger completion report (with intercompany amounts eliminated in accordance with consolidated accounting standards), and may differ from the statement of financial position as of the merger effective date (July 1, 2026). (*2) The post-merger financial information above has not been audited (reviewed) by the external auditor and is subject to change based on the external auditor's audit (review).