BLUEBIRD BIO INC's ticker is BLUE and the CUSIP is 09609G100. A total of 282 filers reported holding BLUEBIRD BIO INC in Q4 2019. The put-call ratio across all filers is 0.80 and the average weighting 0.1%.
Quarter-by-quarter ownership
| Value | Shares | Weighting | ||||
|---|---|---|---|---|---|---|
| Q1 2021 | $281,000 | -89.6% | 9,330 | -69.8% | 0.00% | -87.5% |
| Q4 2019 | $2,711,000 | +244.5% | 30,894 | +414.9% | 0.01% | +166.7% |
| Q1 2019 | $787,000 | +52.2% | 6,000 | +15.0% | 0.00% | +50.0% |
| Q4 2018 | $517,000 | +33.2% | 5,216 | +96.4% | 0.00% | +100.0% |
| Q3 2018 | $388,000 | +1.8% | 2,656 | +9.5% | 0.00% | 0.0% |
| Q2 2018 | $381,000 | +18.0% | 2,425 | +33.5% | 0.00% | 0.0% |
| Q4 2017 | $323,000 | +330.7% | 1,816 | +154.3% | 0.00% | – |
| Q2 2017 | $75,000 | -98.3% | 714 | -98.5% | 0.00% | -100.0% |
| Q1 2017 | $4,358,000 | +47.4% | 47,945 | +0.1% | 0.02% | +33.3% |
| Q4 2016 | $2,956,000 | +74.2% | 47,911 | +60.8% | 0.02% | +63.6% |
| Q3 2016 | $1,697,000 | +51.9% | 29,801 | +15.1% | 0.01% | +37.5% |
| Q2 2016 | $1,117,000 | -0.6% | 25,901 | -2.6% | 0.01% | -11.1% |
| Q1 2016 | $1,124,000 | -20.3% | 26,601 | +21.1% | 0.01% | -25.0% |
| Q4 2015 | $1,411,000 | +153.8% | 21,975 | +238.1% | 0.01% | +140.0% |
| Q3 2015 | $556,000 | +2427.3% | 6,500 | +3511.1% | 0.01% | – |
| Q1 2015 | $22,000 | +266.7% | 180 | +157.1% | 0.00% | – |
| Q4 2014 | $6,000 | – | 70 | – | 0.00% | – |
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Other shareholders
| Name | Shares | Value | Weighting ↓ |
|---|---|---|---|
| Third Rock Ventures, LLC | 3,313,974 | $78,939,000 | 22.36% |
| HARBOURVEST PARTNERS LLC | 59,264 | $1,243,000 | 3.98% |
| RA Capital Management | 467,418 | $9,806,000 | 1.14% |
| HAMILTON LANE ADVISORS LLC | 88,628 | $1,859,000 | 1.08% |
| COWEN INC. | 158,709 | $3,330,000 | 0.56% |
| SPHERA FUNDS MANAGEMENT LTD. | 92,435 | $1,939,000 | 0.54% |
| DEERFIELD MANAGEMENT COMPANY, L.P. (SERIES C) | 423,224 | $8,879,000 | 0.46% |
| Camber Capital Management LP | 206,900 | $4,341,000 | 0.38% |
| Eventide Asset Management | 25,700 | $539,000 | 0.17% |
| SABBY MANAGEMENT, LLC | 102,035 | $2,141,000 | 0.14% |