PROTO LABS INC

CUSIP: 74371310 Class: COM

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP's Holding History (CIK: 0001164508)

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

Q1 2014
Shares 27,439 Value ($000) $1,857 Avg Close — Range —
Q4 2013
Shares 105,680 Value ($000) $7,522 Avg Close — Range —
Q3 2013
Shares 39,684 Value ($000) $3,031 Avg Close — Range —
Q2 2013
Shares 7,793 Value ($000) $506 Avg Close — Range —