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PEAK6 Group LLC
> WDC
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2018 | WESTERN DIGITAL CORP | WDC | 396,900 | -269,400 | 30,724,000 | -30,756,000 | $77.41 |
| 03/31/2018 | WESTERN DIGITAL CORP | WDC | 666,300 | 326,800 | 61,480,000 | 34,480,000 | $92.27 |
| 12/31/2017 | WESTERN DIGITAL CORP | WDC | 339,500 | 184,300 | 27,000,000 | 13,591,000 | $79.53 |
| 09/30/2017 | WESTERN DIGITAL CORP | WDC | 155,200 | 44,100 | 13,409,000 | 3,566,000 | $86.40 |
| 06/30/2017 | WESTERN DIGITAL CORP | WDC | 111,100 | 26,000 | 9,843,000 | 2,820,000 | $88.60 |
| 03/31/2017 | WESTERN DIGITAL CORP | WDC | 85,100 | 85,100 | 7,023,000 | 7,023,000 | $82.53 |
| 06/30/2016 | WESTERN DIGITAL CORP | WDC | 0 | -7,900 | 0 | -729,000 | |
| 12/31/2014 | WESTERN DIGITAL CORP | WDC | 0 | -7,900 | 0 | -729,000 | |
| 09/30/2014 | WESTERN DIGITAL CORP | WDC | 0 | -7,900 | 0 | -729,000 | |
| 06/30/2014 | WESTERN DIGITAL CORP | WDC | 7,900 | -369,600 | 729,000 | -22,710,000 | $92.28 |
| 03/31/2014 | WESTERN DIGITAL CORP | WDC | 55,300 | 8,700 | 5,078,000 | 1,168,000 | $91.83 |
| 12/31/2013 | WESTERN DIGITAL CORP | WDC | 46,600 | -128,900 | 3,910,000 | -7,217,000 | $83.91 |
| 09/30/2013 | WESTERN DIGITAL CORP | WDC | 175,500 | -202,000 | 11,127,000 | -12,312,000 | $63.40 |
| 06/30/2013 | WESTERN DIGITAL CORP | WDC | 377,500 | 290,300 | 23,439,000 | 19,733,000 | $62.09 |
| 03/31/2013 | WESTERN DIGITAL CORP | WDC | 200,900 | 113,700 | 10,103,000 | 6,397,000 | $50.29 |
| 12/31/2012 | WESTERN DIGITAL CORP | WDC | 87,200 | -22,400 | 3,706,000 | -539,000 | $42.50 |
| 09/30/2012 | WESTERN DIGITAL CORP | WDC | 109,600 | -48,400 | 4,245,000 | -571,000 | $38.73 |
| 06/30/2012 | WESTERN DIGITAL CORP | WDC | 158,000 | -1,000 | 4,816,000 | -105,000 | $30.48 |
| 03/31/2012 | WESTERN DIGITAL CORP | WDC | 159,000 | -557,900 | 4,921,000 | -17,268,000 | $30.95 |
| 12/31/2011 | WESTERN DIGITAL CORP | WDC | 716,900 | 56,700 | 22,189,000 | 5,209,000 | $30.95 |
| 09/30/2011 | WESTERN DIGITAL CORP | WDC | 660,200 | 247,500 | 16,980,000 | 1,966,000 | $25.72 |
| 06/30/2011 | WESTERN DIGITAL CORP | WDC | 412,700 | 176,800 | 15,014,000 | 6,217,000 | $36.38 |
| 03/31/2011 | WESTERN DIGITAL CORP | WDC | 235,900 | 88,600 | 8,797,000 | 3,803,000 | $37.29 |
| 12/31/2010 | WESTERN DIGITAL CORP | WDC | 147,300 | -81,600 | 4,994,000 | -1,505,000 | $33.90 |
| 09/30/2010 | WESTERN DIGITAL CORP | WDC | 228,900 | 80,100 | 6,499,000 | 2,011,000 | $28.39 |
| 06/30/2010 | WESTERN DIGITAL CORP | WDC | 148,800 | -71,100 | 4,488,000 | -4,085,000 | $30.16 |
| 03/31/2010 | WESTERN DIGITAL CORP | WDC | 219,900 | 52,800 | 8,573,000 | 1,195,000 | $38.99 |
| 12/31/2009 | WESTERN DIGITAL CORP | WDC | 167,100 | 36,600 | 7,378,000 | 2,611,000 | $44.15 |
| 10/31/2009 | WESTERN DIGITAL CORP | WDC | 130,500 | -57,600 | 4,767,000 | -218,000 | $36.53 |
| 09/30/2009 | WESTERN DIGITAL CORP | WDC | 130,500 | -57,600 | 4,767,000 | -218,000 | $36.53 |
| 08/13/2009 | WESTERN DIGITAL CORP | WDC | 188,100 | 155,700 | 4,985,000 | 4,358,000 | $26.50 |
| 06/30/2009 | WESTERN DIGITAL CORP | WDC | 188,100 | 155,700 | 4,985,000 | 4,358,000 | $26.50 |
| 03/31/2009 | WESTERN DIGITAL CORP | WDC | 32,400 | -42,100 | 627,000 | -226,000 | $19.35 |
| 12/31/2008 | WESTERN DIGITAL CORP | WDC | 74,500 | -168,400 | 853,000 | -4,326,000 | $11.45 |
| 09/30/2008 | WESTERN DIGITAL CORP | WDC | 242,900 | -82,800 | 5,179,000 | -6,067,000 | $21.32 |
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