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TEACHERS ADVISORS, LLC
> ALXN
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 03/31/2019 | ALEXION PHARMACEUTICALS, INC. | ALXN | 732,199 | 421,595 | 98,979,000 | 68,739,000 | $135.18 |
| 12/31/2018 | ALEXION PHARMACEUTICALS, INC. | ALXN | 310,604 | -119,804 | 30,240,000 | -29,591,000 | $97.36 |
| 09/30/2018 | ALEXION PHARMACEUTICALS, INC. | ALXN | 430,408 | -2,766 | 59,831,000 | 6,052,000 | $139.01 |
| 06/30/2018 | ALEXION PHARMACEUTICALS, INC. | ALXN | 433,174 | -420,726 | 53,779,000 | -41,397,000 | $124.15 |
| 03/31/2018 | ALEXION PHARMACEUTICALS, INC. | ALXN | 853,900 | 109,793 | 95,176,000 | 6,188,000 | $111.46 |
| 12/31/2017 | ALEXION PHARMACEUTICALS, INC. | ALXN | 744,107 | 126,250 | 88,988,000 | 2,309,000 | $119.59 |
| 09/30/2017 | ALEXION PHARMACEUTICALS, INC. | ALXN | 617,857 | -378,073 | 86,679,000 | -34,496,000 | $140.29 |
| 06/30/2017 | ALEXION PHARMACEUTICALS, INC. | ALXN | 995,930 | 573,663 | 121,175,000 | 69,979,000 | $121.67 |
| 03/31/2017 | ALEXION PHARMACEUTICALS, INC. | ALXN | 422,267 | 12,179 | 51,196,000 | 1,022,000 | $121.24 |
| 12/31/2016 | ALEXION PHARMACEUTICALS, INC. | ALXN | 410,088 | -186,795 | 50,174,000 | -22,968,000 | $122.35 |
| 09/30/2016 | ALEXION PHARMACEUTICALS, INC. | ALXN | 596,883 | 142,998 | 73,142,000 | 2,159,000 | $122.54 |
| 06/30/2016 | ALEXION PHARMACEUTICALS, INC. | ALXN | 753,833 | 214,483 | 88,018,000 | 12,930,000 | $116.76 |
| 03/31/2016 | ALEXION PHARMACEUTICALS, INC. | ALXN | 539,350 | 47,070 | 75,088,000 | -18,814,000 | $139.22 |
| 12/31/2015 | ALEXION PHARMACEUTICALS, INC. | ALXN | 492,280 | 38,395 | 93,902,000 | 22,919,000 | $190.75 |
| 09/30/2015 | ALEXION PHARMACEUTICALS, INC. | ALXN | 453,885 | 453,885 | 70,983,000 | 70,983,000 | $156.39 |
| 06/30/2015 | ALEXION PHARMACEUTICALS, INC. | ALXN | 726,747 | 726,747 | 131,374,000 | 131,374,000 | $180.77 |
| 03/31/2015 | ALEXION PHARMACEUTICALS, INC. | ALXN | 521,318 | 521,318 | 90,344,000 | 90,344,000 | $173.30 |
| 12/31/2014 | ALEXION PHARMACEUTICALS, INC. | ALXN | 444,892 | 444,892 | 82,318,000 | 82,318,000 | $185.03 |
| 09/30/2014 | ALEXION PHARMACEUTICALS, INC. | ALXN | 410,514 | 410,514 | 68,071,000 | 68,071,000 | $165.82 |
| 06/30/2014 | ALEXION PHARMACEUTICALS, INC. | ALXN | 454,705 | 454,705 | 71,048,000 | 71,048,000 | $156.25 |
| 03/31/2014 | ALEXION PHARMACEUTICALS, INC. | ALXN | 510,428 | 510,428 | 77,651,000 | 77,651,000 | $152.13 |
| 12/31/2013 | ALEXION PHARMACEUTICALS, INC. | ALXN | 778,744 | 778,744 | 103,620,000 | 103,620,000 | $133.06 |
| 09/30/2013 | ALEXION PHARMACEUTICALS, INC. | ALXN | 826,396 | 183,717 | 95,994,000 | 36,713,000 | $116.16 |
| 06/30/2013 | ALEXION PHARMACEUTICALS, INC. | ALXN | 642,679 | 642,679 | 59,281,000 | 59,281,000 | $92.24 |
| 03/31/2013 | ALEXION PHARMACEUTICALS, INC. | ALXN | 0 | -678,432 | 0 | -63,644,000 | |
| 12/31/2012 | ALEXION PHARMACEUTICALS, INC. | ALXN | 678,432 | -64,432 | 63,644,000 | -21,340,000 | $93.81 |
| 09/30/2012 | ALEXION PHARMACEUTICALS, INC. | ALXN | 742,864 | -83,637 | 84,984,000 | 2,912,000 | $114.40 |
| 06/30/2012 | ALEXION PHARMACEUTICALS, INC. | ALXN | 826,501 | 50,302 | 82,072,000 | 9,994,000 | $99.30 |
| 03/31/2012 | ALEXION PHARMACEUTICALS, INC. | ALXN | 776,199 | 217,371 | 72,078,000 | 36,279,000 | $92.86 |
| 12/31/2011 | ALEXION PHARMACEUTICALS, INC. | ALXN | 657,650 | 98,822 | 47,022,000 | 11,223,000 | $71.50 |
| 09/30/2011 | ALEXION PHARMACEUTICALS, INC. | ALXN | 558,828 | 419,907 | 35,799,000 | 29,266,000 | $64.06 |
| 06/30/2011 | ALEXION PHARMACEUTICALS, INC. | ALXN | 138,921 | 109,843 | 6,533,000 | 3,664,000 | $47.03 |
| 03/31/2011 | ALEXION PHARMACEUTICALS, INC. | ALXN | 29,078 | 1,102 | 2,869,000 | 616,000 | $98.67 |
| 12/31/2010 | ALEXION PHARMACEUTICALS, INC. | ALXN | 27,976 | -7,159 | 2,253,000 | -8,000 | $80.53 |
| 09/30/2010 | ALEXION PHARMACEUTICALS, INC. | ALXN | 35,135 | 4,687 | 2,261,000 | 702,000 | $64.35 |
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