Proto Labs Inc — Director's Dealing 2013

May 13, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Proto Labs Inc (PRLB)
CIK: 0001443669
Period of Report: 2013-05-09

Reporting Person: Bolton Edward E. (Vice President, Culture)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-09	Common Stock	M	905	$30.58	Acquired	1805	Direct
2013-05-09	Common Stock	S	905	$54.80	Disposed	900	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-05-09	Employee Stock Option (Right to Buy)	$30.58	M	905	Disposed	2022-05-07	Common Stock (905)	Direct

Footnotes

F1: The option vests as to 20% of the shares in five annual installments beginning on May 7, 2013.