Corporate Event: Questar Corporation (STR) - Effective Thursday, July 1, 2010

Questar Corporation (STR) has announced that it will spin off shares of (New) QEP Resources, Inc. (QEP).

The distribution ratio is one (1) QEP Common Share per STR Common Share. The record date is June 18, 2010;

the mail date is June 30, 2010. The New York Stock Exchange (NYSE) has set July 1, 2010 as the ex-distribution

of the distribution.  The NYSE has determined due-bills for the QEP distribution must accompany each STR Share

delivered after June 18, 2010 in settlement of STR transactions made prior to the ex-date. QEP Resources, Inc.

Common Shares are currently trading when issued on the NYSE under the symbol QEP WI.

This action will be coordinated with the Options Clearing Corporation.

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