Acceleron Pharma Inc. XLRN
Trading inactive
| Name of reporting person | Citizenship or organization | Sole voting power | Shared voting power | Sole dispositive power | Shared dispositive power | Amount beneficially owned | Percent of class | Accepted date |
|---|---|---|---|---|---|---|---|---|
| FMR LLC | Delaware | 77694 | 0 | 493493 | 0 | 493493 | 0.807 % | 10/11/2021 |
| Abigail P. Johnson | United States of America | 0 | 0 | 493493 | 0 | 493493 | 0.807 % | 10/11/2021 |
| FMR LLC | Delaware | 77694 | 0 | 493493 | 0 | 493493 | 0.807 % | 10/11/2021 |
| Abigail P. Johnson | United States of America | 0 | 0 | 493493 | 0 | 493493 | 0.807 % | 10/11/2021 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 959818 | 0 | 5309766 | 0 | 5309766 | 8.8 % | 16/02/2021 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 959818 | 0 | 5309766 | 0 | 5309766 | 8.8 % | 16/02/2021 |
| The Vanguard Group | Pennsylvania | 0 | 39703 | 4946487 | 82091 | 5028578 | 8.35 % | 10/02/2021 |
| Abigail P. Johnson | United States of America | 0 | 0 | 4678413 | 0 | 4678413 | 7.764 % | 08/02/2021 |
| FMR LLC | Delaware | 412222 | 0 | 4678413 | 0 | 4678413 | 7.764 % | 08/02/2021 |
| BlackRock, Inc. | Delaware | 4452154 | 0 | 4611814 | 0 | 4611814 | 7.7 % | 28/01/2021 |
| Abigail P. Johnson | United States of America | 0 | 0 | 5886663 | 0 | 5886663 | 9.828 % | 10/09/2020 |
| Abigail P. Johnson | United States of America | 0 | 0 | 5886663 | 0 | 5886663 | 9.828 % | 10/09/2020 |
| FMR LLC | Delaware | 457908 | 0 | 5886663 | 0 | 5886663 | 9.828 % | 10/09/2020 |
| FMR LLC | Delaware | 457908 | 0 | 5886663 | 0 | 5886663 | 9.828 % | 10/09/2020 |
| BlackRock, Inc. | Delaware | 5282006 | 0 | 5392268 | 0 | 5392268 | 10 % | 09/06/2020 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 640755 | 0 | 3432743 | 0 | 3432743 | 6.4 % | 14/02/2020 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 640755 | 0 | 3432743 | 0 | 3432743 | 6.4 % | 14/02/2020 |
| The Vanguard Group | Pennsylvania | 85990 | 6475 | 4078536 | 86611 | 4165147 | 7.84 % | 12/02/2020 |
| The Vanguard Group | Pennsylvania For | 85990 | 6475 | 4078536 | 86611 | 4165147 | 7.84 % | 12/02/2020 |
| FMR LLC | Delaware | 1199416 | 0 | 7962234 | 0 | 7962234 | 14.999 % | 07/02/2020 |
| Abigail P. Johnson | United States of America | 0 | 0 | 7962234 | 0 | 7962234 | 14.999 % | 07/02/2020 |
| Abigail P. Johnson | United States of America | 0 | 0 | 7962234 | 0 | 7962234 | 14.999 % | 07/02/2020 |
| FMR LLC | Delaware | 1199416 | 0 | 7962234 | 0 | 7962234 | 14.999 % | 07/02/2020 |
| BlackRock, Inc. | Delaware | 4779296 | 0 | 4887801 | 0 | 4887801 | 9.2 % | 05/02/2020 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 611173 | 0 | 2978886 | 0 | 2978886 | 5.6 % | 12/11/2019 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 611173 | 0 | 2978886 | 0 | 2978886 | 5.6 % | 12/11/2019 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 824449 | 0 | 5015667 | 0 | 5015667 | 10.8 % | 14/02/2019 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 824449 | 0 | 5015667 | 0 | 5015667 | 10.8 % | 14/02/2019 |
| The Vanguard Group | Pennsylvania For | 72970 | 5000 | 3448358 | 74270 | 3522628 | 7.62 % | 11/02/2019 |
| The Vanguard Group | Pennsylvania | 72970 | 5000 | 3448358 | 74270 | 3522628 | 7.62 % | 11/02/2019 |
| BlackRock, Inc. | Delaware | 4349173 | 0 | 4428894 | 0 | 4428894 | 9.6 % | 04/02/2019 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 786633 | 0 | 4760028 | 0 | 4760028 | 10.3 % | 10/10/2018 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 786633 | 0 | 4760028 | 0 | 4760028 | 10.3 % | 10/10/2018 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 605107 | 0 | 3184770 | 0 | 3184770 | 7 % | 14/02/2018 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 605107 | 0 | 3184770 | 0 | 3184770 | 7 % | 14/02/2018 |
| The Vanguard Group | Pennsylvania | 64607 | 2600 | 2374871 | 63507 | 2438378 | 5.39 % | 08/02/2018 |
| The Vanguard Group | Pennsylvania | 64607 | 2600 | 2374871 | 63507 | 2438378 | 5.39 % | 08/02/2018 |
| BlackRock, Inc. | Delaware | 4639759 | 0 | 4732135 | 0 | 4732135 | 10.5 % | 23/01/2018 |
| Abigail P. Johnson | United States of America | 0 | 0 | 5285682 | 0 | 5285682 | 11.988 % | 09/11/2017 |
| Abigail P. Johnson | United States of America | 0 | 0 | 5285682 | 0 | 5285682 | 11.988 % | 09/11/2017 |
| FMR LLC | Delaware | 1164865 | 0 | 5285682 | 0 | 5285682 | 11.988 % | 09/11/2017 |
| FMR LLC | Delaware | 1164865 | 0 | 5285682 | 0 | 5285682 | 11.988 % | 09/11/2017 |
| Select Biotechnology Portfolio | Massachusetts | 2629952 | 0 | 0 | 0 | 2629952 | 5.964 % | 10/10/2017 |
| Abigail P. Johnson | United States of America | 0 | 0 | 3726732 | 0 | 3726732 | 8.452 % | 10/10/2017 |
| FMR LLC | Delaware | 121315 | 0 | 3726732 | 0 | 3726732 | 8.452 % | 10/10/2017 |
| Abigail P. Johnson | United States of America | 0 | 0 | 3726732 | 0 | 3726732 | 8.452 % | 10/10/2017 |
| Select Biotechnology Portfolio | Massachusetts | 2629952 | 0 | 0 | 0 | 2629952 | 5.964 % | 10/10/2017 |
| FMR LLC | Delaware | 121315 | 0 | 3726732 | 0 | 3726732 | 8.452 % | 10/10/2017 |
| BlackRock, Inc. | Delaware | 3944875 | 0 | 4005228 | 0 | 4005228 | 10.4 % | 10/07/2017 |
| Abigail P. Johnson | United States of America | 0 | 0 | 5244453 | 0 | 5244453 | 13.893 % | 14/02/2017 |
| FMR LLC | Delaware | 16557 | 0 | 5244453 | 0 | 5244453 | 13.893 % | 14/02/2017 |
| Select Biotechnology Portfolio | Massachusetts | 3669602 | 0 | 0 | 0 | 3669602 | 9.721 % | 14/02/2017 |
| T. ROWE PRICE ASSOCIATES, INC. | MARYLAND | 0 | 0 | 0 | 0 | 3964618 | 10.5 % | 10/02/2017 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 684058 | 0 | 3716879 | 0 | 3716879 | 9.8 % | 06/02/2017 |
| T. ROWE PRICE ASSOCIATES, INC. | Maryland | 684058 | 0 | 3716879 | 0 | 3716879 | 9.8 % | 06/02/2017 |
| BlackRock, Inc. | Delaware | 3459233 | 0 | 3512821 | 0 | 3512821 | 9.3 % | 19/01/2017 |
| Phillip Gross | United States | 0 | 387500 | 0 | 387500 | 387500 | 1.17 % | 16/02/2016 |
| Phillip Gross | United States | 0 | 387500 | 0 | 387500 | 387500 | 1.17 % | 16/02/2016 |
| Robert Atchinson | United States | 0 | 387500 | 0 | 387500 | 387500 | 1.17 % | 16/02/2016 |
| Adage Capital Advisors, L.L.C. | Delaware | 0 | 387500 | 0 | 387500 | 387500 | 1.17 % | 16/02/2016 |
| Adage Capital Partners GP, L.L.C. | Delaware | 0 | 387500 | 0 | 387500 | 387500 | 1.17 % | 16/02/2016 |
| Adage Capital Partners, L.P. | Delaware | 0 | 387500 | 0 | 387500 | 387500 | 1.17 % | 16/02/2016 |
| Adage Capital Partners, L.P. | Delaware | 0 | 387500 | 0 | 387500 | 387500 | 1.17 % | 16/02/2016 |
| Adage Capital Partners GP, L.L.C. | Delaware | 0 | 387500 | 0 | 387500 | 387500 | 1.17 % | 16/02/2016 |
| Adage Capital Advisors, L.L.C. | Delaware | 0 | 387500 | 0 | 387500 | 387500 | 1.17 % | 16/02/2016 |
| Robert Atchinson | United States | 0 | 387500 | 0 | 387500 | 387500 | 1.17 % | 16/02/2016 |
| ATV Associates VII, L.L.C. 2. Check the Appropriate Box if a Member of a Group | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 4.5 % | 16/02/2016 |
| ATV Associates VI, L.L.C. 2. Check the Appropriate Box if a Member of a Group | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 4.5 % | 16/02/2016 |
| ATV Alliance 2003, L.P. 2. Check the Appropriate Box if a Member of a Group | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 4.5 % | 16/02/2016 |
| ATV Entrepreneurs VII, L.P. 2. Check the Appropriate Box if a Member of a Group | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 4.5 % | 16/02/2016 |
| ATV Entrepreneurs VI, L.P. 2. Check the Appropriate Box if a Member of a Group | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 4.5 % | 16/02/2016 |
| Advanced Technology Ventures VII(C), L.P. 2. Check the Appropriate Box if a Member of a Group | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 4.5 % | 16/02/2016 |
| Advanced Technology Ventures VII | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 4.5 % | 16/02/2016 |
| Advanced Technology Ventures VII, L.P. 2. Check the Appropriate Box if a Member of a Group | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 4.5 % | 16/02/2016 |
| Advanced Technology Ventures VI, L.P. | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 4.5 % | 16/02/2016 |
| ATV Alliance Associates, L.L.C. 2. Check the Appropriate Box if a Member of a Group | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 4.5 % | 16/02/2016 |
| T. ROWE PRICE ASSOCIATES, INC. | MARYLAND | 0 | 0 | 0 | 0 | 2929479 | 8.8 % | 11/02/2016 |
| BlackRock, Inc. | Delaware | 2193427 | 0 | 2235763 | 0 | 2235763 | 6.7 % | 25/01/2016 |
| Samuel D. Isaly | United States | 0 | 0 | 0 | 0 | 0 | 0 % | 17/02/2015 |
| OrbiMed Capital GP II LLC | Delaware | 0 | 0 | 0 | 0 | 0 | 0 % | 17/02/2015 |
| OrbiMed Advisors LLC | Delaware | 0 | 0 | 0 | 0 | 0 | 0 % | 17/02/2015 |
| OrbiMed Advisors LLC | Delaware | 0 | 0 | 0 | 0 | 0 | 0 % | 17/02/2015 |
| Samuel D. Isaly | United States | 0 | 0 | 0 | 0 | 0 | 0 % | 17/02/2015 |
| OrbiMed Capital GP II LLC | Delaware | 0 | 0 | 0 | 0 | 0 | 0 % | 17/02/2015 |
| Adage Capital Advisors, L.L.C. | Delaware | 0 | 1772406 | 0 | 1772406 | 1772406 | 5.5 % | 17/02/2015 |
| Adage Capital Partners GP, L.L.C. | Delaware | 0 | 1772406 | 0 | 1772406 | 1772406 | 5.5 % | 17/02/2015 |
| Adage Capital Partners, L.P. | Delaware | 0 | 1772406 | 0 | 1772406 | 1772406 | 5.5 % | 17/02/2015 |
| Adage Capital Partners GP, L.L.C. | Delaware | 0 | 1772406 | 0 | 1772406 | 1772406 | 5.5 % | 17/02/2015 |
| Adage Capital Partners, L.P. | Delaware | 0 | 1772406 | 0 | 1772406 | 1772406 | 5.5 % | 17/02/2015 |
| Adage Capital Advisors, L.L.C. | Delaware | 0 | 1772406 | 0 | 1772406 | 1772406 | 5.5 % | 17/02/2015 |
| Robert Atchinson | United States | 0 | 1772406 | 0 | 1772406 | 1772406 | 5.5 % | 17/02/2015 |
| Phillip Gross | United States | 0 | 1772406 | 0 | 1772406 | 1772406 | 5.5 % | 17/02/2015 |
| Phillip Gross | United States | 0 | 1772406 | 0 | 1772406 | 1772406 | 5.5 % | 17/02/2015 |
| Robert Atchinson | United States | 0 | 1772406 | 0 | 1772406 | 1772406 | 5.5 % | 17/02/2015 |
| Select Biotechnology Portfolio | Massachusetts | 3068473 | 0 | 0 | 0 | 3068473 | 9.513 % | 13/02/2015 |
| Edward C. Johnson 3d | United States of America | 0 | 0 | 4837978 | 0 | 4837978 | 14.999 % | 13/02/2015 |
| Abigail P. Johnson | United States of America | 0 | 0 | 4837978 | 0 | 4837978 | 14.999 % | 13/02/2015 |
| FMR LLC | Delaware | 1800 | 0 | 4837978 | 0 | 4837978 | 14.999 % | 13/02/2015 |
| AGTC Advisors Fund, L.P. | Delaware | 5 | 5 | 5 | 5 | 5 | 0 % | 12/02/2015 |
| Applied Genomic Technology Capital Fund, L.P. | Delaware | 5 | 5 | 5 | 5 | 5 | 0 % | 12/02/2015 |
| AGTC Partners, L.P. | Delaware | 5 | 5 | 5 | 5 | 5 | 0 % | 12/02/2015 |
| NewcoGen Group, Inc. | Delaware | 5 | 5 | 5 | 5 | 5 | 0 % | 12/02/2015 |
| Flagship Ventures Management, Inc. | Delaware | 5 | 5 | 5 | 5 | 5 | 0 % | 12/02/2015 |
| Noubar B. Afeyan Ph.D. | United States | 5 | 5 | 5 | 5 | 5 | 0 % | 12/02/2015 |
| Edwin M. Kania, Jr. | United States | 5 | 5 | 5 | 5 | 5 | 0 % | 12/02/2015 |
| Advanced Technology Ventures VII, L.P. | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 5.2 % | 10/02/2015 |
| Advanced Technology Ventures VI, L.P. | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 5.2 % | 10/02/2015 |
| ATV Alliance Associates, L.L.C. | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 5.2 % | 10/02/2015 |
| ATV Associates VII, L.L.C. | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 5.2 % | 10/02/2015 |
| ATV Alliance 2003, L.P. | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 5.2 % | 10/02/2015 |
| ATV Entrepreneurs VII, L.P. | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 5.2 % | 10/02/2015 |
| ATV Associates VI, L.L.C. | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 5.2 % | 10/02/2015 |
| ATV Entrepreneurs VI, L.P. | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 5.2 % | 10/02/2015 |
| Advanced Technology Ventures VII , L.P. | Delaware | 0 | 16773992 | 0 | 16773992 | 16773992 | 5.2 % | 10/02/2015 |
| BlackRock, Inc. | Delaware | 1594391 | 719 | 1631862 | 719 | 1632581 | 5.1 % | 06/02/2015 |
| T. ROWE PRICE ASSOCIATES, INC. | MARYLAND | 0 | 0 | 0 | 0 | 3271727 | 10.4 % | 10/07/2014 |
| T. ROWE PRICE ASSOCIATES, INC. | MARYLAND | 0 | 0 | 0 | 0 | 3271727 | 10.4 % | 10/07/2014 |
| Robert Atchinson | United States | 0 | 1600469 | 0 | 1600469 | 1600469 | 5.09 % | 12/06/2014 |
| Adage Capital Advisors, L.L.C. | Delaware | 0 | 1600469 | 0 | 1600469 | 1600469 | 5.09 % | 12/06/2014 |
| Adage Capital Partners GP, L.L.C. | Delaware | 0 | 1600469 | 0 | 1600469 | 1600469 | 5.09 % | 12/06/2014 |
| Adage Capital Partners, L.P. | Delaware | 0 | 1600469 | 0 | 1600469 | 1600469 | 5.09 % | 12/06/2014 |
| Adage Capital Advisors, L.L.C. | Delaware | 0 | 1600469 | 0 | 1600469 | 1600469 | 5.09 % | 12/06/2014 |
| Phillip Gross | United States | 0 | 1600469 | 0 | 1600469 | 1600469 | 5.09 % | 12/06/2014 |
| Robert Atchinson | United States | 0 | 1600469 | 0 | 1600469 | 1600469 | 5.09 % | 12/06/2014 |
| Phillip Gross | United States | 0 | 1600469 | 0 | 1600469 | 1600469 | 5.09 % | 12/06/2014 |
| Adage Capital Partners, L.P. | Delaware | 0 | 1600469 | 0 | 1600469 | 1600469 | 5.09 % | 12/06/2014 |
| Adage Capital Partners GP, L.L.C. | Delaware | 0 | 1600469 | 0 | 1600469 | 1600469 | 5.09 % | 12/06/2014 |
| Edward C. Johnson 3d | United States of America | 0 | 0 | 4206928 | 0 | 4206928 | 13.376 % | 12/05/2014 |
| FMR LLC | Delaware | 0 | 0 | 4206928 | 0 | 4206928 | 13.376 % | 12/05/2014 |
| Edward C. Johnson 3d | United States of America | 0 | 0 | 4206928 | 0 | 4206928 | 13.376 % | 12/05/2014 |
| FMR LLC | Delaware | 0 | 0 | 4206928 | 0 | 4206928 | 13.376 % | 12/05/2014 |
| Venrock Associates IV, L.P. | Delaware | 0 | 26224352 | 0 | 26224352 | 26224352 | 9.2 % | 14/02/2014 |
| Venrock Partners Management, LLC | Delaware | 0 | 26224352 | 0 | 26224352 | 26224352 | 9.2 % | 14/02/2014 |
| Venrock Management IV, LLC | Delaware | 0 | 26224352 | 0 | 26224352 | 26224352 | 9.2 % | 14/02/2014 |
| VEF Management IV, LLC | Delaware | 0 | 26224352 | 0 | 26224352 | 26224352 | 9.2 % | 14/02/2014 |
| Venrock Partners, L.P. | Delaware | 0 | 26224352 | 0 | 26224352 | 26224352 | 9.2 % | 14/02/2014 |
| Venrock Entrepreneurs Fund IV, L.P. | Delaware | 0 | 26224352 | 0 | 26224352 | 26224352 | 9.2 % | 14/02/2014 |
| Samuel D. Isaly | United States | 0 | 2272819 | 0 | 2272819 | 2272819 | 8.02 % | 13/02/2014 |
| OrbiMed Capital GP II LLC | Delaware | 0 | 2272819 | 0 | 2272819 | 2272819 | 8.02 % | 13/02/2014 |
| OrbiMed Advisors LLC | Delaware | 0 | 2272819 | 0 | 2272819 | 2272819 | 8.02 % | 13/02/2014 |
| OrbiMed Advisors LLC | Delaware | 0 | 2272819 | 0 | 2272819 | 2272819 | 8.02 % | 13/02/2014 |
| Samuel D. Isaly | United States | 0 | 2272819 | 0 | 2272819 | 2272819 | 8.02 % | 13/02/2014 |
| OrbiMed Capital GP II LLC | Delaware | 0 | 2272819 | 0 | 2272819 | 2272819 | 8.02 % | 13/02/2014 |
| ATV Alliance 2003, L.P. | Delaware | 0 | 25137832 | 0 | 25137832 | 25137832 | 8.9 % | 13/02/2014 |
| ATV Alliance Associates, L.L.C. | Delaware | 0 | 25137832 | 0 | 25137832 | 25137832 | 8.9 % | 13/02/2014 |
| ATV Associates VII, L.L.C. | Delaware | 0 | 25137832 | 0 | 25137832 | 25137832 | 8.9 % | 13/02/2014 |
| ATV Associates VI, L.L.C. | Delaware | 0 | 25137832 | 0 | 25137832 | 25137832 | 8.9 % | 13/02/2014 |
| ATV Entrepreneurs VI, L.P. | Delaware | 0 | 25137832 | 0 | 25137832 | 25137832 | 8.9 % | 13/02/2014 |
| Advanced Technology Ventures VII(C), L.P. | Delaware | 0 | 25137832 | 0 | 25137832 | 25137832 | 8.9 % | 13/02/2014 |
| Advanced Technology Ventures VII (B), L.P. | Delaware | 0 | 25137832 | 0 | 25137832 | 25137832 | 8.9 % | 13/02/2014 |
| Advanced Technology Ventures VII, L.P. | Delaware | 0 | 25137832 | 0 | 25137832 | 25137832 | 8.9 % | 13/02/2014 |
| Advanced Technology Ventures VI, L.P. | Delaware | 0 | 25137832 | 0 | 25137832 | 25137832 | 8.9 % | 13/02/2014 |
| ATV Entrepreneurs VII, L.P. | Delaware | 0 | 25137832 | 0 | 25137832 | 25137832 | 8.9 % | 13/02/2014 |
| Flagship Ventures Management, Inc. | Delaware | 0 | 2276479 | 0 | 2276479 | 2276479 | 7.3 % | 10/02/2014 |
| Applied Genomic Technology Capital Fund, L.P. | Delaware | 0 | 2146720 | 0 | 2146720 | 2146720 | 6.9 % | 10/02/2014 |
| AGTC Advisors Fund, L.P. | Delaware | 0 | 129759 | 0 | 129759 | 129759 | 0.4 % | 10/02/2014 |
| AGTC Partners, L.P. | Delaware | 0 | 2276479 | 0 | 2276479 | 2276479 | 7.3 % | 10/02/2014 |
| NewcoGen Group, Inc. | Delaware | 0 | 2276479 | 0 | 2276479 | 2276479 | 7.3 % | 10/02/2014 |
| Edwin M. Kania, Jr. | United States | 6534 | 2276479 | 65341 | 2276479 | 2283013 | 7.3 % | 10/02/2014 |
| Noubar B. Afeyan Ph.D. | United States | 4867 | 2276479 | 4867 | 2276479 | 2281346 | 7.3 % | 10/02/2014 |