Proto Labs Inc — Director's Dealing 2013

May 31, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Proto Labs Inc (PRLB)
CIK: 0001443669
Period of Report: 2013-05-30

Reporting Person: LOFTUS MARGARET A (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-30	Common Stock	S	10000	$53.8278	Disposed	71250	Direct

Footnotes

F1: Reflects the weighted average price of 10,000 shares of common stock of Proto Labs, Inc. sold by the reporting person in multiple transactions on May 30, 2013 with sale prices ranging from $53.75 to $54.07 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.