Pioneer has retained an outside transfer agent to maintain records for holders of Pioneer common stock. Communication concerning the transfer or exchange of shares, lost certificates or change of address should be directed to:
Continental Stock Transfer & Trust Company (CST)
17 Battery Place - 8th Floor
New York, NY 10004
MESA ROYALTY TRUST AND MESA OFFSHORE TRUST:
Mesa Royalty Trust and Mesa Offshore Trust are separate, publicly traded entities.
For information on these Trusts, contact the Trustee:
Mesa Royalty Trust - Bank of New York Trust Company, N.A., 919 Congress Ave., 5th Floor, Austin, TX 78701. The telephone number is (512) 236-6599.
Mesa Offshore Trust - JPMorgan Chase Bank, N.A., 919 Congress Ave., 5th Floor, Austin, TX 78701. The telephone number is (512) 236-6599.