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: 2013-05-10

Reporting Person: Schneider Jacqueline D. (VP Sales & Customer Service)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-10	Common Stock	M	7000	$4.54	Acquired	8250	Direct
2013-05-10	Common Stock	S	7000	$57.80	Disposed	1250	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-05-10	Employee Stock Option (Right to Buy)	$4.54	M	7000	Disposed	2018-03-11	Common Stock (7000)	Direct

Footnotes

F1: Transaction effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 4, 2013. The transactions reported on this Form 4 conclude the transactions contemplated by the Rule 10b5-1 trading plan.