| SC 13G/A | 2009-02-13 | LORD ABBETT & CO LLC | AVISTA CORP | 2,309,538 | 4.2% | EDGAR |
| SC 13G | 2009-02-11 | DONALD SMITH & CO., INC. | AVISTA CORP | 1,216,000 | - | EDGAR |
| SC 13G | 2009-02-05 | BARCLAYS GLOBAL INVESTORS NA /CA/ | AVISTA CORP | 1,123,894 | 2.1% | EDGAR |
| SC 13G/A | 2008-02-14 | LORD ABBETT & CO LLC | AVISTA CORP | 3,241,327 | 6.1% | EDGAR |
| SC 13G | 2008-02-08 | DONALD SMITH & CO., INC. | AVISTA CORP | 5,218,608 | 9.9% | EDGAR |
| SC 13G | 2008-02-05 | BARCLAYS GLOBAL INVESTORS NA /CA/ | AVISTA CORP | 943,260 | 1.8% | EDGAR |
| SC 13G | 2007-02-14 | LORD ABBETT & CO LLC | AVISTA CORP | 4,715,260 | 9.1% | EDGAR |
| SC 13G | 2007-01-23 | BARCLAYS GLOBAL INVESTORS NA /CA/ | AVISTA CORP | 944,377 | 1.8% | EDGAR |
| SC 13G | 2006-02-09 | BARCLAYS PLC | AVISTA CORP | 20,300 | 0.0% | EDGAR |
| SC 13G/A | 2006-02-08 | VANGUARD FIDUCIARY TRUST CO | AVISTA CORP | 2,404,593 | 5.0% | EDGAR |
| SC 13G/A | 2006-02-08 | VANGUARD FIDUCIARY TRUST CO | AVISTA CORP | 2,404,593 | 5.0% | EDGAR |
| SC 13G | 2005-02-14 | BARCLAYS GLOBAL INVESTORS NA /CA/ | AVISTA CORP | 1,906,848 | 3.9% | EDGAR |
| SC 13G/A | 2005-02-02 | VANGUARD FIDUCIARY TRUST CO | AVISTA CORP | 2,865,706 | 5.9% | EDGAR |
| SC 13G/A | 2004-02-17 | CASCADE INVESTMENT LLC | AVISTA CORP | 2,332,200 | 4.8% | EDGAR |
| SC 13G | 2004-02-17 | BARCLAYS GLOBAL INVESTORS NA /CA/ | AVISTA CORP | 1,749,491 | 3.6% | EDGAR |
| SC 13G/A | 2004-01-29 | VANGUARD FIDUCIARY TRUST CO | AVISTA CORP | 2,937,808 | 6.1% | EDGAR |
| SC 13G/A | 2003-02-13 | CASCADE INVESTMENT LLC | AVISTA CORP | 2,982,200 | 6.2% | EDGAR |
| SC 13G/A | 2003-02-10 | VANGUARD FIDUCIARY TRUST CO | AVISTA CORP | 2,902,946 | 6.1% | EDGAR |
| SC 13G/A | 2002-02-14 | CASCADE INVESTMENT LLC | AVISTA CORP | 3,187,500 | 6.7% | EDGAR |
| SC 13G/A | 2002-02-14 | FEIRSTEIN BARRY R | AVISTA CORP | 0 | 0.0% | EDGAR |