GRAN TIERRA ENERGY INC

CUSIP: 38500T101 Class: COM

COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS's Holding History (CIK: 0001083190)

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

Q4 2014
Shares 641,035 Value ($000) $2,468 Avg Close — Range —
Q3 2014
Shares 722,944 Value ($000) $4,005 Avg Close — Range —
Q2 2014
Shares 607,787 Value ($000) $4,935 Avg Close — Range —
Q1 2014
Shares 454,439 Value ($000) $3,399 Avg Close — Range —
Q4 2013
Shares 454,439 Value ($000) $3,322 Avg Close — Range —
Q3 2013
Shares 454,439 Value ($000) $3,222 Avg Close — Range —
Q2 2013
Shares 454,439 Value ($000) $2,731 Avg Close — Range —