| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G | 2014-02-13 | ORBIMED ADVISORS LLC | ACCELERON PHARMA INC | 2,272,819 | 8.0% | EDGAR |
| SC 13G | 2014-02-13 | ADVANCED TECHNOLOGY VENTURES VII LP | ACCELERON PHARMA INC | 2,513,783 | 8.9% | EDGAR |
| SC 13G | 2014-02-10 | Applied Genomic Technology Capital Fund LP | ACCELERON PHARMA INC | 2,146,720 | 6.9% | EDGAR |
| SC 13D/A | 2014-01-30 | CELGENE CORP /DE/ | ACCELERON PHARMA INC | 3,511,866 | 11.3% | EDGAR |
| SC 13D | 2013-10-03 | CELGENE CORP /DE/ | ACCELERON PHARMA INC | 3,211,866 | 11.4% | EDGAR |