Proto Labs Inc — Director's Dealing 2013

Jan 4, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Proto Labs Inc (PRLB)
CIK: 0001443669
Period of Report: 2013-01-02

Reporting Person: KRANTZ DONALD G (Chief Operating Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-01-02	Common Stock	M	15000	$1.79	Acquired	15000	Direct
2013-01-02	Common Stock	S	9572	$39.2659	Disposed	5428	Direct
2013-01-02	Common Stock	S	5428	$40.3074	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-01-02	Employee Stock Option (Right to Buy)	$1.79	M	15000	Disposed	2015-11-21	Common Stock (15000)	Direct

Footnotes

F1: Transaction effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 27, 2012.

F2: Reflects the weighted average price of 9,572 shares of common stock of Proto Labs, Inc. sold by the reporting person in multiple transactions on January 2, 2013 with sale prices ranging from $39.00 to $39.71 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.

F3: Reflects the weighted average price of 5,428 shares of common stock of Proto Labs, Inc. sold by the reporting person in multiple transactions on January 2, 2013 with sale prices ranging from $40.30 to $40.38 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.

F4: Fully vested.