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WELLINGTON MANAGEMENT GROUP LLP
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| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2023 | bluebird bio, Inc. | BLUE | 555,595 | 325,234 | 1,827,908,000 | 1,095,360,000 | $3,290.00 |
| 03/31/2023 | bluebird bio, Inc. | BLUE | 230,361 | -13,700 | 732,548,000 | 731,003,000 | $3,180.00 |
| 09/30/2022 | bluebird bio, Inc. | BLUE | 244,061 | -5,895,939 | 1,545,000 | -23,875,000 | $6.33 |
| 06/30/2022 | bluebird bio, Inc. | BLUE | 6,140,000 | 0 | 25,420,000 | -4,359,000 | $4.14 |
| 03/31/2022 | bluebird bio, Inc. | BLUE | 6,140,000 | 0 | 29,779,000 | -31,560,000 | $4.85 |
| 12/31/2021 | bluebird bio, Inc. | BLUE | 6,140,000 | -778,987 | 61,339,000 | -70,883,000 | $9.99 |
| 09/30/2021 | bluebird bio, Inc. | BLUE | 6,918,987 | -3,247 | 132,222,000 | -89,151,000 | $19.11 |
| 06/30/2021 | bluebird bio, Inc. | BLUE | 6,922,234 | 5,091 | 221,373,000 | 12,821,000 | $31.98 |
| 03/31/2021 | bluebird bio, Inc. | BLUE | 6,917,143 | 1,567,978 | 208,552,000 | -22,907,000 | $30.15 |
| 02/26/2021 | bluebird bio, Inc. | BLUE | 6,915,454 | 1,566,289 | 215,070,619 | -16,388,381 | $31.10 |
| 12/31/2020 | bluebird bio, Inc. | BLUE | 5,349,165 | -1,863,062 | 231,459,000 | -157,641,000 | $43.27 |
| 09/30/2020 | bluebird bio, Inc. | BLUE | 7,212,227 | -27,755 | 389,100,000 | -52,829,000 | $53.95 |
| 06/30/2020 | bluebird bio, Inc. | BLUE | 7,239,982 | 419,668 | 441,929,000 | 128,468,000 | $61.04 |
| 03/31/2020 | bluebird bio, Inc. | BLUE | 6,820,314 | -657,799 | 313,461,000 | -342,744,000 | $45.96 |
| 12/31/2019 | bluebird bio, Inc. | BLUE | 7,478,113 | -3,567 | 656,205,000 | -30,764,000 | $87.75 |
| 09/30/2019 | bluebird bio, Inc. | BLUE | 7,481,680 | 229,880 | 686,969,000 | -235,459,000 | $91.82 |
| 06/30/2019 | bluebird bio, Inc. | BLUE | 7,251,800 | -59,900 | 922,428,000 | -227,921,000 | $127.20 |
| 03/31/2019 | bluebird bio, Inc. | BLUE | 7,311,700 | -80,128 | 1,150,349,000 | 417,079,000 | $157.33 |
| 12/31/2018 | bluebird bio, Inc. | BLUE | 7,391,828 | 3,024,199 | 733,270,000 | 95,595,000 | $99.20 |
| 10/31/2018 | bluebird bio, Inc. | BLUE | 5,760,150 | 1,392,521 | 660,689,205 | 23,014,205 | $114.70 |
| 09/30/2018 | bluebird bio, Inc. | BLUE | 4,367,629 | 1,418,189 | 637,675,000 | 174,761,000 | $146.00 |
| 06/30/2018 | bluebird bio, Inc. | BLUE | 2,949,440 | 471,805 | 462,914,000 | 39,857,000 | $156.95 |
| 03/31/2018 | bluebird bio, Inc. | BLUE | 2,477,635 | -309,983 | 423,057,000 | -73,418,000 | $170.75 |
| 12/31/2017 | bluebird bio, Inc. | BLUE | 2,787,618 | -1,303,499 | 496,475,000 | -65,440,000 | $178.10 |
| 12/29/2017 | bluebird bio, Inc. | BLUE | 2,787,618 | -1,303,499 | 496,474,766 | -65,440,234 | $178.10 |
| 09/30/2017 | bluebird bio, Inc. | BLUE | 4,091,117 | 356,274 | 561,915,000 | 169,570,000 | $137.35 |
| 06/30/2017 | bluebird bio, Inc. | BLUE | 3,734,843 | 3,351,337 | 392,345,000 | 357,485,000 | $105.05 |
| 03/31/2017 | bluebird bio, Inc. | BLUE | 383,506 | -2,666,013 | 34,860,000 | -153,296,000 | $90.90 |
| 12/31/2016 | bluebird bio, Inc. | BLUE | 3,049,519 | 1,085,880 | 188,156,000 | 55,060,000 | $61.70 |
| 09/30/2016 | bluebird bio, Inc. | BLUE | 1,963,639 | 1,963,639 | 133,096,000 | 133,096,000 | $67.78 |
| 06/30/2016 | bluebird bio, Inc. | BLUE | 2,075,954 | 2,075,954 | 89,869,000 | 89,869,000 | $43.29 |
| 03/31/2016 | bluebird bio, Inc. | BLUE | 1,202,247 | 1,202,247 | 51,095,000 | 51,095,000 | $42.50 |
| 12/31/2015 | bluebird bio, Inc. | BLUE | 0 | -3,380 | 0 | -569,000 | |
| 09/30/2015 | bluebird bio, Inc. | BLUE | 0 | -3,380 | 0 | -569,000 | |
| 06/30/2015 | bluebird bio, Inc. | BLUE | 3,380 | -41,209 | 569,000 | -4,816,000 | $168.34 |
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