Proto Labs Inc — Director's Dealing 2013

Apr 12, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Proto Labs Inc (PRLB)
CIK: 0001443669
Period of Report: 2013-04-10

Reporting Person: KRANTZ DONALD G (Chief Operating Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-04-10	Common Stock	M	42000	$7.86	Acquired	43250	Direct
2013-04-10	Common Stock	S	29650	$50.2814	Disposed	13600	Direct
2013-04-10	Common Stock	S	12350	$51.2178	Disposed	1250	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-04-10	Employee Stock Option (right to buy)	$7.86	M	42000	Disposed	2020-12-21	Common Stock (42000)	Direct

Footnotes

F1: Transaction effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 15, 2013. The transactions reported on this Form 4 conclude the transactions contemplated by the Rule 10b5-1 trading plan.

F2: Reflects the weighted average price of 29,650 shares of common stock of Proto Labs, Inc. sold by the reporting person in multiple transactions on April 10, 2013 with sale prices ranging from $50.00 to $50.99 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 12,350 shares of common stock of Proto Labs, Inc. sold by the reporting person in multiple transactions on April 10, 2013 with sale prices ranging from $51.00 to $51.60 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: The option vests as to 20% of the shares in five annual installments beginning on December 21, 2011.