ARC Resources Ltd./ARC Energy Trust Announce the May 2010 increase to the ARX
Exchangeable Shares Exchange Ratio

CALGARY, June 1 /CNW/ - (AET.UN and ARX - TSX) ARC Resources Ltd. along with ARC Energy Trust announces the increase to the exchange ratio of the exchangeable shares of the corporation from 2.78466 to 2.79848. Such increase will be effective on June 15, 2010.

The following are the details on the calculation of the exchange ratio:

                                      10 day
    Record                           average             Effective
    date                      ARC    trading                  date
    of ARC                 Energy   price of                of the   Exchange
    Energy                  Trust     AET.UN   Increase   increase   ratio as
    Trust       Opening    distri- (prior to         in         in         of
    distri-    exchange    bution  the end of  exchange   exchange  effective
    bution        ratio  per unit  the month)  ratio(xx)     ratio       date
    May 31,                                                June 15,
     2010       2.78466     $0.10   $20.1467    0.01382      2010    2.79848

    (xx) The increase in the exchange ratio is calculated by dividing the ARC
         Energy Trust distribution per unit by the 10 day weighted average
         trading price of AET.UN and multiplying by the opening exchange

A holder of ARC Resources Ltd. exchangeable shares can exchange all or a portion of their holdings at any time by giving notice to their investment advisor or Computershare Investor Services at its principal transfer office in Suite 600, 530 - 8th Avenue SW, Calgary, Alberta, T2P 3S8, their telephone number is 1-800-564-6253 and their website is

    John P. Dielwart,
    Chief Executive Officer

%SEDAR: 00015954E %CIK: 0001029509

For further information: For further information: about ARC Energy Trust, please visit our website or contact: Investor Relations, E-mail:, Telephone: (403) 503-8600, Fax: (403) 509-6427, Toll Free 1-888-272-4900, ARC Resources Ltd., 1200, 308 - 4th Avenue S.W., Calgary, AB, T2P 0H7

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