CUBIST PHARMACEUTICALS INC

CUSIP: 229678107 Class: COM

VIKING GLOBAL INVESTORS LP's Holding History (CIK: 0001103804)

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

Q4 2013
Shares 741,700 Value ($000) $51,080 Avg Close — Range —
Q3 2013
Shares 594,704 Value ($000) $37,793 Avg Close — Range —