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| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 09/30/2017 | NORTHWESTERN CORP | NWEC | 0 | -215,000 | 0 | -6,343,000 | |
| 06/30/2017 | NORTHWESTERN CORP | NWEC | 0 | -215,000 | 0 | -6,343,000 | |
| 06/30/2010 | NORTHWESTERN CORP | NWEC | 0 | -125,294 | 0 | -3,359,000 | |
| 03/31/2010 | NORTHWESTERN CORP | NWEC | 125,294 | -46,506 | 3,359,000 | -1,111,000 | $26.81 |
| 12/31/2009 | NORTHWESTERN CORP | NWEC | 171,800 | 0 | 4,470,000 | 273,000 | $26.02 |
| 09/30/2009 | NORTHWESTERN CORP | NWEC | 171,800 | 0 | 4,197,000 | 287,000 | $24.43 |
| 06/30/2009 | NORTHWESTERN CORP | NWEC | 171,800 | 0 | 3,910,000 | 220,000 | $22.76 |
| 03/31/2009 | NORTHWESTERN CORP | NWEC | 171,800 | 0 | 3,690,000 | -334,000 | $21.48 |
| 12/31/2008 | NORTHWESTERN CORP | NWEC | 171,800 | -43,200 | 4,024,000 | -1,379,000 | $23.42 |
| 09/30/2008 | NORTHWESTERN CORP | NWEC | 215,000 | 0 | 5,403,000 | -62,000 | $25.13 |
| 06/30/2008 | NORTHWESTERN CORP | NWEC | 215,000 | 0 | 5,465,000 | 225,000 | $25.42 |
| 03/31/2008 | NORTHWESTERN CORP | NWEC | 215,000 | 0 | 5,240,000 | -1,103,000 | $24.37 |
| 12/31/2007 | NORTHWESTERN CORP | NWEC | 215,000 | 0 | 6,343,000 | 501,000 | $29.50 |
| 11/05/2007 | NORTHWESTERN CORP | NWEC | 215,000 | 25,000 | 5,842,000 | -202,000 | $27.17 |
| 06/30/2007 | NORTHWESTERN CORP | NWEC | 190,000 | 0 | 6,044,000 | -688,000 | $31.81 |
| 03/31/2007 | NORTHWESTERN CORP | NWEC | 190,000 | 0 | 6,732,000 | 10,000 | $35.43 |
| 12/31/2006 | NORTHWESTERN CORP | NWEC | 190,000 | 0 | 6,722,000 | 76,000 | $35.38 |
| 09/30/2006 | NORTHWESTERN CORP | NWEC | 190,000 | 0 | 6,646,000 | 119,000 | $34.98 |
| 06/30/2006 | NORTHWESTERN CORP | NWEC | 190,000 | 75,500 | 6,527,000 | 2,961,000 | $34.35 |
| 03/31/2006 | NORTHWESTERN CORP | NWEC | 114,500 | 114,500 | 3,566,000 | 3,566,000 | $31.14 |
| 12/31/2004 | NORTHWESTERN CORP | NWEC | 30,000 | 30,000 | 840,000 | 840,000 | $28.00 |
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