AntarChile S A : Material fact. Informs modification of the dividend policy and the distribution of two interim dividends. 01.10.2021

MATERIAL FACT

ANTARCHILE S.A.

Securities Registry Listing Nº342

Santiago, October 1, 2021

Messrs.

Financial Market Commission

Dear Sirs:

The undersigned, as CEO of the publicly traded company AntarChile S.A., hereinafter also referred to as "AntarChile" or "the Company," both domiciled in Santiago at Avda. El Golf N°150, floor 21, district of Las Condes, taxpayer ID Nº96.556.310-5, duly empowered by the board of directors, hereby reports the following material information about the Company, its businesses, its publicly traded securities or the offering thereof, and this communication is made pursuant to what is established in article 9, and subparagraph 2 of article 10, both of Law Nº18.045:

A board meeting held today agreed to modify the Company's current dividend policy of distributing no less than 30% of the net profits of each business year, and approved the distribution of interim dividends charged to the profits of the current year, as indicated below.

The above mentioned is based on the large improvement experimented by the Company's results, reflected by the latest financial statements published; along with the extraordinary financial profit the Company will recognize in the third quarter due to the sale of forest lands and its stake in Gasmar S.A., made by the subsidiaries Celulosa Arauco y Constitución S.A. ("Arauco") and Abastible S.A., respectively. All this was reported as material facts, and it will be reflected in dividends to be distributed by our subsidiaries Empresas Copec S.A. and Arauco, also already reported to the market. Besides this, there are also dividends announced by our related company Colbún S.A.

Hence, and in accordance with the resolutions adopted today by the board of directors of AntarChile, the Company will:

1. Distribute a first interim dividend, to be paid in cash as of October 28 of this year, of US$0.5303 per share, equivalent to 100% of the extraordinary profits from the sale of the mentioned assets, and a majority fraction of the dividends to be received from Colbún S.A., mentioned above.
2. Modify the dividend policy, increasing the percentage to be distributed of the distributable net profits from 30% to 40%. In the case of the 2021 business year, the extraordinary profits and the interim dividend mentioned above in point N°1 will not be considered for the calculation of the 40% to be distributed.
3. Distribute, as of November 10, a second interim dividend, also payable in cash and charged to the profits of this year, of US$0.5717 per share, which in this case shall be chargeable to the 40% indicated in the previous point.

The total amount to be distributed for the interim dividends mentioned in points 1) and 3) is approximately US$503 million.

Sincerely,

AntarChile S.A.

Andrés Lehuedé B.

CEO

c.c.: Santiago Stock Exchange

Chilean Electronic Stock Exchange, Stock Exchange Credit Rating Commission