Proto Labs Inc — Director's Dealing 2013

Mar 19, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Proto Labs Inc (PRLB)
CIK: 0001443669
Period of Report: 2013-03-15

Reporting Person: KRANTZ DONALD G (Chief Operating Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-03-15	Common Stock	M	29818	$1.79	Acquired	31068	Direct
2013-03-15	Common Stock	S	25207	$46.8052	Disposed	5861	Direct
2013-03-15	Common Stock	S	4611	$47.8364	Disposed	1250	Direct
2013-03-18	Common Stock	M	18182	$1.79	Acquired	19432	Direct
2013-03-18	Commo Stock	S	18182	$46.6685	Disposed	1250	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-03-15	Employee Stock Option (Right to Buy)	$1.79	M	29818	Disposed	2015-11-21	Common Stock (29818)	Direct
2013-03-18	Employee Stock Option (Right to Buy)	$1.79	M	18182	Disposed	2015-11-21	Common Stock (18182)	Direct

Footnotes

F1: Sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 15, 2013.

F2: Reflects the weighted average price of 25,207 shares of common stock of Proto Labs, Inc. sold by the reporting person in multiple transactions on March 15, 2013 with sale prices ranging from $46.22 to $47.10 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 4,611 shares of common stock of Proto Labs, Inc. sold by the reporting person in multiple transactions on March 15, 2013 with sale prices ranging from $47.20 to $48.15 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: Reflects the weighted average price of 18,182 shares of common stock of Proto Labs, Inc. sold by the reporting person in multiple transactions on February 15, 2013 with sale prices ranging from $46.38 to $46.85 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.

F5: Fully vested.