[Amended] Material event report (decision to sell own convertible bonds)

A later amendment corrects this filing, so the terms on this page may be out of date. See the latest version (2026-09-03) →

What happened

Material event report (decision to sell own convertible bonds) 6.0 Adbiotech Co., Ltd.

Amendment Report July 3, 2026

1. Disclosure document being amended: Material event report (decision to sell own convertible bonds) 2. Original filing date of the disclosure document being amended: March 27, 2026 3. Amendment details Item: 9. Date of (expected) receipt of sale proceeds; Reason for amendment: Change in final-payment schedule; Before amendment: 2026.07.03; After amendment: 2026.09.03 Item: 13. Other matters for reference in investment decisions; Before amendment: 2) The "9. Date of (expected) receipt of sale proceeds" above is the final-payment date, with details as follows. - Down payment 2026.03.27 KRW 165,000,000 / Final payment 2026.07.03 KRW 3,135,000,000; After amendment: 2) The "9. Date of (expected) receipt of sale proceeds" above is the final-payment date, with details as follows. - Down payment 2026.03.27 KRW 165,000,000 / Final payment 2026.09.03 KRW 3,135,000,000

Material event report / Korea Exchange reporting matter To the Financial Services Commission / Korea Exchange March 27, 2026

Company name: Adbiotech Co., Ltd. Representative Director: Kim Do-hyung Head office address: 39 Geodudanji 1-gil, Dongnae-myeon, Chuncheon-si, Gangwon State (Tel) 070-4193-4006 (Website) http://www.adbiotech.com Preparer: (Title) Director (Name) Choi Kyung-min (Tel) 070-4193-4006

Decision to sell own convertible bonds

1. Type of bond: Series 7; Type: Unregistered, unsecured, privately placed convertible bonds 2. Bond issue date: 2025.07.03 3. Bond issuance method: Private placement 4. Bond maturity date: 2030.07.03 5. Total face value (electronically registered) of the bonds (KRW): 8,000,000,000

6. Details of the pre-maturity acquisition of the bonds to be sold Face value (electronically registered) of the bonds to be sold (KRW): 3,000,000,000 Acquisition amount (KRW): 3,115,397,260 Background of acquisition: Separate agreement with the bondholder

7. Sale decision date: 2026.03.27 8. Sale amount Amount (KRW): 3,300,000,000 Basis of calculation: Determined through mutual agreement with the buyer after comprehensively considering the bond's interest rate, stock price conditions, etc.

9. Date of (expected) receipt of sale proceeds: 2026.09.03 10. Purpose of sale: Securing operating funds and improving the financial structure

11. Matters concerning conversion Conversion ratio (%): 100 Conversion price as of the report date (KRW/share): 1,797 Type of shares to be issued upon conversion: Adbiotech Co., Ltd. registered common shares Number of shares: 1,669,449 Ratio to total shares (%): 7.82 Conversion request period -- start date: 2026.07.03; end date: 2030.06.03

12. Whether subject to reporting to the Fair Trade Commission: Not applicable

13. Other matters for reference in investment decisions 1) "7. Sale decision date" above is the board resolution date. 2) "9. Date of (expected) receipt of sale proceeds" above is the final-payment date, with details as follows. - Down payment 2026.03.27 KRW 165,000,000 / Final payment 2026.09.03 KRW 3,135,000,000 3) The "conversion price as of the report date" in "11. Matters concerning conversion" above is the price adjusted from the original conversion price following the rights offering payments made on November 19, 2025 and January 13, 2026. 4) The "ratio to total shares" under "shares to be issued upon conversion" in "11. Matters concerning conversion" above is calculated as [number of voting shares to be issued / (total number of issued voting shares as of the acquisition date + number of voting shares to be issued)]. 5) Matters concerning the early redemption request right (put option) The bondholders of these bonds may request early redemption, in whole or in part, of the electronically registered amount of the bonds on the date falling one year after the issue date of the bonds, i.e. July 3, 2026 (the "Early Redemption Payment Date"), and on each date falling every 3 months thereafter. However, if an Early Redemption Payment Date is not a business day, the following business day shall be the Early Redemption Payment Date, and no interest shall accrue for the period after the original Early Redemption Payment Date.

(1) Early Redemption Payment Dates and amounts claimable 2026.07.03: 103.00% of the electronically registered amount 2026.10.03: 103.77% of the electronically registered amount 2027.01.03: 104.55% of the electronically registered amount 2027.04.03: 105.31% of the electronically registered amount 2027.07.03: 106.09% of the electronically registered amount 2027.10.03: 106.88% of the electronically registered amount 2028.01.03: 107.68% of the electronically registered amount 2028.04.03: 108.47% of the electronically registered amount 2028.07.03: 109.27% of the electronically registered amount 2028.10.03: 110.09% of the electronically registered amount 2029.01.03: 110.91% of the electronically registered amount 2029.04.03: 111.72% of the electronically registered amount 2029.07.03: 112.55% of the electronically registered amount 2029.10.03: 113.39% of the electronically registered amount 2030.01.03: 114.24% of the electronically registered amount 2030.04.03: 115.08% of the electronically registered amount

(2) Early redemption rate and request period: Bondholders must submit an early redemption request to the issuer from 60 days to 30 days before the Early Redemption Payment Date (the "Early Redemption Request Period"). However, if the end date of the Early Redemption Request Period is not a business day, it shall extend to the following business day. Round: Early redemption request period (From / To); Early redemption payment date; Early redemption rate 1st: 2026-05-04 / 2026-06-03; 2026-07-03; 103.00% 2nd: 2026-08-04 / 2026-09-03; 2026-10-03; 103.77% 3rd: 2026-11-04 / 2026-12-04; 2027-01-03; 104.55% 4th: 2027-02-02 / 2027-03-04; 2027-04-03; 105.31% 5th: 2027-05-04 / 2027-06-03; 2027-07-03; 106.09% 6th: 2027-08-04 / 2027-09-03; 2027-10-03; 106.88% 7th: 2027-11-04 / 2027-12-04; 2028-01-03; 107.68% 8th: 2028-02-03 / 2028-03-04; 2028-04-03; 108.47% 9th: 2028-05-04 / 2028-06-03; 2028-07-03; 109.27% 10th: 2028-08-04 / 2028-09-03; 2028-10-03; 110.09% 11th: 2028-11-04 / 2028-12-04; 2029-01-03; 110.91% 12th: 2029-02-02 / 2029-03-04; 2029-04-03; 111.72% 13th: 2029-05-04 / 2029-06-03; 2029-07-03; 112.55% 14th: 2029-08-04 / 2029-09-03; 2029-10-03; 113.39% 15th: 2029-11-04 / 2029-12-04; 2030-01-03; 114.24% 16th: 2030-02-02 / 2030-03-04; 2030-04-03; 115.08%

(3) Place for early redemption requests: The Company's head office (4) Place of early redemption payment: Industrial Bank of Korea, Chuncheon Branch (5) Early redemption request procedure: A bondholder wishing to exercise the early redemption right shall, if the bonds are electronically registered in a customer account, request early redemption to the Korea Securities Depository through the account management institution with which the bondholder deals; if the bonds are electronically registered in the bondholder's own account, the bondholder shall request early redemption directly to the Korea Securities Depository, which will then consolidate such requests and submit the early redemption request to the place for requests.

[Matters concerning the buyers] Buyer name; Relationship with the Company or largest shareholder; Selection process; Transaction history and plans within 6 months before/after the sale decision; Face value of bonds purchased (KRW); Remarks Pine Tree Investment Association: -; Selected considering the investor's payment capacity and timing, etc., in order to raise funds needed for business operations; -; 1,500,000,000; - Park Jin-hwan: -; Selected considering the investor's payment capacity and timing, etc., in order to raise funds needed for business operations; -; 1,000,000,000; - Oh In-seop: -; Selected considering the investor's payment capacity and timing, etc., in order to raise funds needed for business operations; -; 500,000,000; -

[Where the buyers include a corporation or organization] (1) Basic information on the corporation or organization Name; Number of investors (persons); Representative Director (representative partner) name/share(%); Managing member (managing partner) name/share(%); Largest shareholder (largest investor) name/share(%) Pine Tree Investment Association: 4; Kang Hyo-jae / 1; -/-; Jeong Yu-jung / 33

(2) Key financial matters of the corporation or organization for the most recent fiscal year (Unit: KRW million) Fiscal year: -; Fiscal year-end: -; Total assets: -; Revenue: -; Total liabilities: -; Net income (loss): -; Total equity: -; External auditor: -; Capital stock: -; Audit opinion: -