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PEAK6 Group LLC
> BRK/B
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2018 | BERKSHIRE HATHAWAY INC | BRK/B | 29,100 | -159,000 | 5,432,000 | -32,090,000 | $186.67 |
| 03/31/2018 | BERKSHIRE HATHAWAY INC | BRK/B | 188,100 | 112,500 | 37,522,000 | 22,537,000 | $199.48 |
| 12/31/2017 | BERKSHIRE HATHAWAY INC | BRK/B | 75,600 | 14,000 | 14,985,000 | 3,692,000 | $198.21 |
| 09/30/2017 | BERKSHIRE HATHAWAY INC | BRK/B | 61,600 | 1,600 | 11,293,000 | 1,131,000 | $183.33 |
| 06/30/2017 | BERKSHIRE HATHAWAY INC | BRK/B | 60,000 | -55,300 | 10,162,000 | -9,056,000 | $169.37 |
| 03/31/2017 | BERKSHIRE HATHAWAY INC | BRK/B | 115,300 | 115,300 | 19,218,000 | 19,218,000 | $166.68 |
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