IPG PHOTONICS CORP — Director's Dealing 2017

May 5, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IPG PHOTONICS CORP (IPGP)
CIK: 0001111928
Period of Report: 2017-05-04

Reporting Person: Mammen Timothy PV (SVP, Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-05-04	Common Stock	M	11250	$15.82	Acquired	42350	Direct
2017-05-04	Common Stock	D	11250	$133.96	Disposed	31100	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-04	Employee Stock Option (right to buy)	$15.82	M	11250	Disposed	2020-02-25	Common Stock (11250.0)	Direct

Footnotes

F1: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 9, 2017.

F2: The reported transaction involves sales transactions from $133.02 to $135.64 per share. The weighted average price per share was $133.96. The Reporting Person undertakes to provide upon request by the SEC staff, the Issuer or a security holder of the Issuer information regarding the number of shares sold at each separate price.

F3: Options vest in four equal quarterly installments commencing on March 31, 2014.