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CORRECTION NOTICE FOR STOCK PLEDGE AGREEMENT ACCOMPANIED BY CHANGE OF LARGEST SHAREHOLDER

Correcting Company: Joong Ang Advanced Materials Co., Ltd. Correction Date: September 18, 2026

1. ORIGINAL DISCLOSURE DOCUMENT Execution of Stock Pledge Agreement Accompanied by Change of Largest Shareholder

2. DATE OF ORIGINAL DISCLOSURE SUBMISSION February 27, 2026

3. REASON FOR CORRECTION Correction due to additional pledge provision

4. CORRECTION DETAILS

Corrected Items (Before → After):

1. Matters Related to Pledgor (Largest Shareholder) - Number of shares owned as of disclosure date: 16,142,059 shares → 1,614,205 shares - Number of shares owned upon full execution of pledge: 642,059 shares → 5 shares - Shareholding ratio upon full execution of pledge: 0.58% → 0.00%

2. Debt (Borrowing) Amount - Total: ₩11,796,657,534 → ₩41,042,471,793

3. Pledge Setting Amount - Total: ₩22,413,649,315 → ₩51,659,463,574

4. Details of Pledge Provision - Cumulative number of pledge provision contracts: 3 → 4 - Cumulative total number of pledged shares: 15,500,000 shares → 1,614,200 shares

6. OTHER MATTERS FOR INVESTMENT DECISION REFERENCE

- This pledge provision involves debtor ㈜Enchem providing 15,500,000 ordinary shares of ㈜Joong Ang Advanced Materials held by ㈜Enchem as collateral for borrowing.

- As additional loan agreements have been executed while maintaining existing loan agreements, the number of pledged shares is stated separately for each contract in the individual pledge provision contract details below. However, this is recorded due to split pledge setting on the same shares. Therefore, regarding items 1 through 2 in the [Individual Pledge Provision Contract Details], 10,000,000 shares have been pledged, and regarding item 3, 5,500,000 shares have been pledged.

- The total pledge setting amount in item 3 above is calculated by applying a 190% pledge maintenance ratio to the debt amount, based on the loan condition that the market value of pledged shares evaluated at market price on the trading date must be maintained at 190% or more of the outstanding loan balance, in accordance with the individual pledge provision contract details.

- The pledge right setting contract execution date in item 5 above is the initial contract date for pledging ordinary shares of ㈜Joong Ang Advanced Materials.

- The largest shareholder may change due to reverse repurchase or ownership transfer if all or part of the pledge rights under the stock pledge agreement are executed.

- The Company resolved at an extraordinary shareholders' meeting to conduct a stock consolidation combining 1 ordinary share with a par value of ₩500 into ₩5,000, which became effective on September 15, 2026. The number of shares stated in this disclosure is based on the number of shares after the stock consolidation.

- This pledge provision involves debtor ㈜Enchem previously pledging 1,550,000 ordinary shares of ㈜Joong Ang Advanced Materials held by ㈜Enchem for borrowing, and additionally pledging 64,200 shares for contract performance.

- Regarding items 1, 2, and 3 in the individual pledge provision contract details below, as additional loan agreements have been executed while maintaining existing loan agreements, the number of pledged shares is stated separately for each contract in the individual pledge provision contract details. However, this is recorded due to split pledge setting on the same shares. Therefore, regarding items 1 through 2 in the [Individual Pledge Provision Contract Details], 1,000,000 shares have been pledged, and regarding item 3, 550,000 shares have been pledged.

- Item 4 in the individual pledge provision contract details below is a contract in which ㈜Enchem establishes a subordinate pledge with the creditor as the subordinate pledgee for the purpose of performing the creditor's (pledge holder's) stock purchase request right.

- The total pledge setting amount in item 3 above is calculated for items 1, 2, and 3 in the individual pledge provision contract details by applying a 190% pledge maintenance ratio to the debt amount, based on the loan condition that the market value of pledged shares evaluated at market price on the trading date must be maintained at 190% or more of the outstanding loan balance. For item 4 in the individual pledge provision contract details, the amount that ㈜Enchem must bear upon exercise of the stock purchase right is calculated, and the total is the sum of pledge provision amounts for items 1, 2, 3, and 4.

- The pledge right setting contract execution date in item 5 above is the initial contract date for pledging ordinary shares of ㈜Joong Ang Advanced Materials.

- The largest shareholder may change due to reverse repurchase or ownership transfer if all or part of the pledge rights under the stock pledge agreement are executed.

INDIVIDUAL PLEDGE PROVISION CONTRACT DETAILS (Item 4)

Sequence: 4 Creditor (Pledge Holder): Secondary Battery New Technology No. 1 Co., Ltd. Debtor: ㈜Enchem Borrowing Purpose: Contract Performance Pledge Setting Amount: ₩29,245,814,259 Type of Pledge Right: Ordinary Shares Number of Pledged Shares: 642,000 shares Mandatory Holding Requirement: Not Applicable Pledge Provision Period: September 18, 2026, October 14, 2026 Contract Execution Date: September 18, 2026

PLEDGE RIGHT EXECUTION CONDITIONS (Item 4)

Sequence: 4 Pledge Right Execution Conditions (Including Special Provisions): Maturity of deadline, loss of benefit of time

EXECUTION OF STOCK PLEDGE AGREEMENT ACCOMPANIED BY CHANGE OF LARGEST SHAREHOLDER

1. MATTERS RELATED TO PLEDGOR (LARGEST SHAREHOLDER)

Name (Company Name): ㈜Enchem Number of Shares Owned as of Disclosure Date: 1,614,205 shares Shareholding Ratio: 14.53% Number of Shares Owned Upon Full Execution of Pledge: 5 shares Shareholding Ratio Upon Full Execution of Pledge: 0.00%

2. DEBT (BORROWING) AMOUNT Total: ₩41,042,471,793

3. PLEDGE SETTING AMOUNT Total: ₩51,659,463,574

4. DETAILS OF PLEDGE PROVISION Cumulative Number of Pledge Provision Contracts: 4 Cumulative Total Number of Pledged Shares: 1,614,200 shares

5. PLEDGE RIGHT SETTING CONTRACT EXECUTION DATE (Current Matter) May 12, 2025

6. OTHER MATTERS FOR INVESTMENT DECISION REFERENCE

- The Company resolved at an extraordinary shareholders' meeting to conduct a stock consolidation combining 1 ordinary share with a par value of ₩500 into ₩5,000, which became effective on September 15, 2026. The number of shares stated in this disclosure is based on the number of shares after the stock consolidation.

- This pledge provision involves debtor ㈜Enchem previously pledging 1,550,000 ordinary shares of ㈜Joong Ang Advanced Materials held by ㈜Enchem for borrowing, and additionally pledging 64,200 shares for contract performance.

- Regarding items 1, 2, and 3 in the individual pledge provision contract details below, as additional loan agreements have been executed while maintaining existing loan agreements, the number of pledged shares is stated separately for each contract in the individual pledge provision contract details. However, this is recorded due to split pledge setting on the same shares. Therefore, regarding items 1 through 2 in the [Individual Pledge Provision Contract Details], 1,000,000 shares have been pledged, and regarding item 3, 550,000 shares have been pledged.

- Item 4 in the individual pledge provision contract details below is a contract in which ㈜Enchem establishes a subordinate pledge with the creditor as the subordinate pledgee for the purpose of performing the creditor's (pledge holder's) stock purchase request right.

- The total pledge setting amount in item 3 above is calculated for items 1, 2, and 3 in the individual pledge provision contract details by applying a 190% pledge maintenance ratio to the debt amount, based on the loan condition that the market value of pledged shares evaluated at market price on the trading date must be maintained at 190% or more of the outstanding loan balance. For item 4 in the individual pledge provision contract details, the amount that ㈜Enchem must bear upon exercise of the stock purchase right is calculated, and the total is the sum of pledge provision amounts for items 1, 2, 3, and 4.

- The pledge right setting contract execution date in item 5 above is the initial contract date for pledging ordinary shares of ㈜Joong Ang Advanced Materials.

- The largest shareholder may change due to reverse repurchase or ownership transfer if all or part of the pledge rights under the stock pledge agreement are executed.

RELATED DISCLOSURES - January 5, 2026: Execution of Stock Pledge Agreement Accompanied by Change of Largest Shareholder - January 15, 2026: Execution of Stock Pledge Agreement Accompanied by Change of Largest Shareholder - February 3, 2026: Execution of Stock Pledge Agreement Accompanied by Change of Largest Shareholder - February 27, 2026: Execution of Stock Pledge Agreement Accompanied by Change of Largest Shareholder - May 29, 2026: Execution of Stock Pledge Agreement Accompanied by Change of Largest Shareholder

INDIVIDUAL PLEDGE PROVISION CONTRACT DETAILS

| Seq | Creditor (Pledge Holder) | Debtor | Borrowing Purpose | Pledge Setting Amount (₩) | Type of Pledge Right | Number of Pledged Shares | Mandatory Holding | Pledge Provision Period (Start, End) | Contract Execution Date | |-----|--------------------------|--------|-------------------|---------------------------|----------------------|-------------------------|------------------|--------------------------------------|------------------------| | 1 | Coreline Invest | ㈜Enchem | Operating Funds | 3,413,649,315 | Ordinary Shares | 1,000,000 | Not Applicable | May 12, 2025, November 30, 2026 | May 12, 2025 | | 2 | Coreline Invest | ㈜Enchem | Operating Funds | 9,500,000,000 | Ordinary Shares | 1,000,000 | Not Applicable | February 2, 2026, November 30, 2026 | February 2, 2026 | | 3 | Coreline Invest | ㈜Enchem | Operating Funds | 9,500,000,000 | Ordinary Shares | 550,000 | Not Applicable | February 27, 2026, November 30, 2026 | February 27, 2026 | | 4 | Secondary Battery New Technology No. 1 Co., Ltd. | ㈜Enchem | Contract Performance | 29,245,814,259 | Ordinary Shares | 64,200 | Not Applicable | September 18, 2026, October 14, 2026 | September 18, 2026 |

PLEDGE RIGHT EXECUTION CONDITIONS

| Seq | Pledge Right Execution Conditions (Including Special Provisions) | |-----|-------------------------------------------------------------------| | 1 | Default on debt, loss of benefit of time, maintenance of 190% or more pledge maintenance ratio | | 2 | Default on debt, loss of benefit of time, maintenance of 190% or more pledge maintenance ratio | | 3 | Default on debt, loss of benefit of time, maintenance of 190% or more pledge maintenance ratio | | 4 | Maturity of deadline, loss of benefit of time |

MATTERS CONCERNING DEBTOR

1. PERSONAL INFORMATION

Basic Information: Name (Company Name): ㈜Enchem Nationality: Republic of Korea Address (Principal Place of Business): 107 Bio Valley-ro, Jecheon-si, Chungcheongbuk-do Date of Birth (Business Registration Number): 304-81-25799 Occupation (Business Description): Manufacturing and sale of electrolyte for secondary batteries and EDLC

Largest Shareholder, Representative Director, and Representative Executive Officer Status and Financial Condition (When Debtor is a Corporation):

| Classification | Name | Number of Shares | Shareholding Ratio (%) | |---|---|---|---| | Largest Shareholder | Oh Jung-gang | 3,148,643 | 14.47 | | Representative Director | Oh Jung-gang | 3,148,643 | 14.47 |

Financial Information (Unit: Million Won)

| Item | 2024 (Fiscal Year 13) | |---|---| | Total Assets | 1,126,930 | | Capital | 10,555 | | Total Liabilities | 660,117 | | Sales | 365,709 | | Total Capital | 466,813 | | Net Income for the Period | -571,164 | | External Auditor | Hyundai Accounting Firm | | Suspension of Business | No | | Audit Opinion | Unqualified Opinion | | Closure of Business | No |

2. RELATIONSHIP WITH THE LISTED COMPANY OR LARGEST SHAREHOLDER, ETC.

Relationship Between Debtor and Listed Company: Largest Shareholder

Relationship Between Debtor and Company's Largest Shareholder and Officers:

| Name | Relationship with Debtor | |---|---| | Largest Shareholder ㈜Enchem | Self (Largest Shareholder) |

3. TRANSACTION HISTORY WITH THE LISTED COMPANY OVER THE PAST THREE YEARS (EXCLUDING ROUTINE TRANSACTIONS)

| Classification | Name (Company Name) | Current Year | Previous Year | Year Before Previous | 2023 | |---|---|---|---|---|---| | | | | | | July 7: Acquisition of 14th Convertible Bonds (₩22 billion) |