| SC 13G/A | 2008-02-13 | PRICE T ROWE ASSOCIATES INC /MD/ | BLACK HILLS CORP /SD/ | 2,496,607 | 6.6% | EDGAR |
| SC 13G/A | 2008-02-08 | FIRST TRUST PORTFOLIOS LP | BLACK HILLS CORP /SD/ | 4,396,113 | 11.6% | EDGAR |
| SC 13G | 2007-10-05 | FIRST TRUST PORTFOLIOS LP | BLACK HILLS CORP /SD/ | 3,801,740 | 10.1% | EDGAR |
| SC 13G | 2007-02-14 | LORD ABBETT & CO LLC | BLACK HILLS CORP /SD/ | 3,278,854 | 9.8% | EDGAR |
| SC 13G/A | 2007-02-13 | PRICE T ROWE ASSOCIATES INC /MD/ | BLACK HILLS CORP /SD/ | 2,297,940 | 6.8% | EDGAR |
| SC 13G/A | 2007-01-17 | FIRST TRUST PORTFOLIOS LP | BLACK HILLS CORP /SD/ | 641,567 | 1.9% | EDGAR |
| SC 13G/A | 2006-02-14 | PRICE T ROWE ASSOCIATES INC /MD/ | BLACK HILLS CORP /SD/ | 2,220,640 | 6.7% | EDGAR |
| SC 13G | 2006-02-09 | FIRST TRUST PORTFOLIOS LP | BLACK HILLS CORP /SD/ | 2,474,995 | 7.5% | EDGAR |
| SC 13G/A | 2005-02-16 | PRICE T ROWE ASSOCIATES INC /MD/ | BLACK HILLS CORP /SD/ | 2,270,599 | 6.9% | EDGAR |
| SC 13G | 2005-02-09 | PRICE T ROWE ASSOCIATES INC /MD/ | BLACK HILLS CORP /SD/ | 2,270,599 | 6.9% | EDGAR |
| SC 13G | 2004-10-12 | BARCLAYS GLOBAL INVESTORS NA /CA/ | BLACK HILLS CORP /SD/ | 855,169 | 2.6% | EDGAR |
| SC 13G/A | 2003-07-07 | BLACK HILLS CORP /SD/ | KFX INC | - | 0.0% | EDGAR |
| SC 13G | 2003-02-10 | BLACK HILLS CORP /SD/ | KFX INC | 2,000,000 | 5.2% | EDGAR |