Proto Labs Inc — Director's Dealing 2013

May 2, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Proto Labs Inc (PRLB)
CIK: 0001443669
Period of Report: 2013-05-01

Reporting Person: Goodman John B (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-01	Common Stock	M	2000	$4.27	Acquired	8250	Direct
2013-05-01	Common Stock	S	2000	$50.60	Disposed	6250	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-05-01	Employee Stock Option (Right to Buy)	$4.27	M	2000	Disposed	2017-07-10	Common Stock (2000)	Direct

Footnotes

F1: Transaction effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 24, 2012.

F2: Fully vested.