PROTO LABS INC

Ticker: PRLB CUSIP: 743713109 Class: EQTY

Capital World Investors's Holding History (CIK: 0001422849)

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

Q1 2014

Shares 160,452 Value ($000) $10,858 Avg Close $74.38 Range $62.09 - $84.00

Q4 2013

Shares 160,452 Value ($000) $11,421 Avg Close $77.51 Range $65.52 - $89.97

Q3 2013

Shares 420,452 Value ($000) $32,118 Avg Close $69.23 Range $61.46 - $80.66

Q2 2013

Shares 593,452 Value ($000) $38,557 Avg Close $53.72 Range $43.62 - $67.40

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2014	160,452	$10,858	$74.38	$62.09 - $84.00
Q4 2013	160,452	$11,421	$77.51	$65.52 - $89.97
Q3 2013	420,452	$32,118	$69.23	$61.46 - $80.66
Q2 2013	593,452	$38,557	$53.72	$43.62 - $67.40