ATARA BIOTHERAPEUTICS INC

CUSIP: 46513107 Class: COM

RTW INVESTMENTS, LP's Holding History (CIK: 0001493215)

Note: Option positions (PUT/CALL) are excluded.

Q3 2016
Shares 458,113 Value ($000) $9,799 Avg Close — Range —
Q3 2015
Shares 262,995 Value ($000) $8,269 Avg Close — Range —