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COLUMBIA PARTNERS L L C INVESTMENT MANAGEMENT
> AMT
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 12/31/2018 | AMERICAN TOWER CORP /MA/ | AMT | 51,721 | -153 | 8,181,000 | 644,000 | $158.18 |
| 09/30/2018 | AMERICAN TOWER CORP /MA/ | AMT | 51,874 | 0 | 7,537,000 | 59,000 | $145.29 |
| 06/30/2018 | AMERICAN TOWER CORP /MA/ | AMT | 51,874 | 0 | 7,478,000 | -61,000 | $144.16 |
| 03/31/2018 | AMERICAN TOWER CORP /MA/ | AMT | 51,874 | 0 | 7,539,000 | 139,000 | $145.33 |
| 12/31/2017 | AMERICAN TOWER CORP /MA/ | AMT | 51,874 | 0 | 7,400,000 | 310,000 | $142.65 |
| 09/30/2017 | AMERICAN TOWER CORP /MA/ | AMT | 51,874 | 0 | 7,090,000 | 227,000 | $136.68 |
| 06/30/2017 | AMERICAN TOWER CORP /MA/ | AMT | 51,874 | 0 | 6,863,000 | 559,000 | $132.30 |
| 03/31/2017 | AMERICAN TOWER CORP /MA/ | AMT | 51,874 | 0 | 6,304,000 | 822,000 | $121.53 |
| 12/31/2016 | AMERICAN TOWER CORP /MA/ | AMT | 51,874 | -37,211 | 5,482,000 | -4,614,000 | $105.68 |
| 09/30/2016 | AMERICAN TOWER CORP /MA/ | AMT | 89,085 | -1,648 | 10,096,000 | -212,000 | $113.33 |
| 06/30/2016 | AMERICAN TOWER CORP /MA/ | AMT | 90,733 | 38,859 | 10,308,000 | 5,279,000 | $113.61 |
| 03/31/2016 | AMERICAN TOWER CORP /MA/ | AMT | 100,972 | 49,098 | 10,336,000 | 5,307,000 | $102.37 |
| 12/31/2015 | AMERICAN TOWER CORP /MA/ | AMT | 51,874 | -23,346 | 5,029,000 | -474,000 | $96.95 |
| 09/30/2015 | AMERICAN TOWER CORP /MA/ | AMT | 51,874 | 0 | 4,563,000 | -276,000 | $87.96 |
| 06/30/2015 | AMERICAN TOWER CORP /MA/ | AMT | 51,874 | -22,588 | 4,839,000 | -680,000 | $93.28 |
| 03/31/2015 | AMERICAN TOWER CORP /MA/ | AMT | 51,874 | -131 | 4,883,000 | -257,000 | $94.13 |
| 12/31/2014 | AMERICAN TOWER CORP /MA/ | AMT | 73,848 | -614 | 5,680,000 | 161,000 | $76.91 |
| 09/30/2014 | AMERICAN TOWER CORP /MA/ | AMT | 52,005 | 765 | 4,869,000 | 259,000 | $93.63 |
| 06/30/2014 | AMERICAN TOWER CORP /MA/ | AMT | 51,240 | -23,222 | 4,610,000 | -909,000 | $89.97 |
| 03/31/2014 | AMERICAN TOWER CORP /MA/ | AMT | 74,462 | 0 | 6,096,000 | 577,000 | $81.87 |
| 12/31/2013 | AMERICAN TOWER CORP /MA/ | AMT | 74,462 | 0 | 5,943,000 | 424,000 | $79.81 |
| 09/30/2013 | AMERICAN TOWER CORP /MA/ | AMT | 74,462 | -758 | 5,519,000 | 16,000 | $74.12 |
| 06/30/2013 | AMERICAN TOWER CORP /MA/ | AMT | 75,220 | 75,220 | 5,503,000 | 5,503,000 | $73.16 |
| 03/31/2013 | AMERICAN TOWER CORP /MA/ | AMT | 73,848 | 73,848 | 5,680,000 | 5,680,000 | $76.91 |
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