Sec Form 4 Filing - Burgomaster Thomas J @ IPG PHOTONICS CORP - 2014-02-28

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Burgomaster Thomas J 2. Issuer Name and Ticker or Trading Symbol IPG PHOTONICS CORP [ IPGP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Accounting Officer (Last) (First) (Middle) 50 OLD WEBSTER ROAD 3. Date of Earliest Transaction (MM/DD/YY) 02/28/2014 (Street) OXFORD, MA01540 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 02/28/2014 A 700 ( 1 ) A $ 0 6,037 D Common Stock 03/31/2014 F 55 D $ 71.08 5,982 D Common Stock 06/30/2014 F 55 D $ 68.8 6,091 ( 2 ) D Common Stock 09/30/2014 F 55 D $ 68.78 6,036 D Common Stock 12/31/2014 F 55 D $ 74.92 6,162 ( 3 ) D Common Stock 01/05/2015 M 2,900 A $ 10.27 9,062 D Common Stock 01/05/2015 S 2,900 D $ 72.92 ( 4 ) 6,162 D Common Stock 01/05/2015 M 2,231 A $ 15.82 8,393 D Common Stock 01/05/2015 S 2,231 D $ 73 6,162 D Common Stock 01/12/2015 S 662 D $ 71.43 ( 5 ) 5,500 D Common Stock 01/23/2015 M 2,232 A $ 15.82 7,732 D Common Stock 01/23/2015 S 2,232 D $ 75.19 5,500 D Common Stock 01/23/2015 S 1,125 D $ 75.13 4,375 D Common Stock 02/06/2015 M 2,500 A $ 21.35 6,875 D Common Stock 02/06/2015 S 2,500 D $ 80.09 4,375 D Common Stock 02/09/2015 M 2,500 A $ 21.35 6,875 D Common Stock 02/09/2015 S 2,500 D $ 85.32 4,375 D Common Stock 02/25/2015 A 1,166 ( 6 ) A $ 0 5,541 D Common Stock 03/31/2015 F 222 D $ 92.7 5,319 D Common Stock 06/30/2015 F 222 D $ 85.18 5,265 ( 7 ) D Common Stock 09/30/2015 F 221 D $ 75.97 5,044 D Common Stock 11/11/2015 M 637 A $ 15.82 5,681 D Common Stock 11/11/2015 S 637 D $ 90.85 5,044 D Common Stock 11/27/2015 S 200 D $ 92.48 4,844 D Common Stock 12/02/2015 S 294 D $ 93.7 4,550 D Common Stock 12/31/2015 F 222 D $ 89.16 4,475 ( 8 ) D

Tabl e II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Employee Stock Option (right to buy) $ 71.77 02/28/2014 A 4,400 ( 9 ) 02/28/2024 Common Stock 4,400 $ 0 4,400 D Employee Stock Option (right to buy) $ 10.27 01/05/2015 M 2,900 ( 10 ) 05/07/2019 Common Stock 2,900 $ 0 0 D Employee Stock Option (right to buy) $ 15.82 01/05/2015 M 2,231 ( 11 ) 02/26/2020 Common Stock 2,231 $ 0 2,869 D Employee Stock Option (right to buy) $ 15.82 01/23/2015 M 2,232 ( 11 ) 02/26/2020 Common Stock 2,232 $ 0 637 D Employee Stock Option (right to buy) $ 21.35 02/06/2015 M 2,500 ( 12 ) 08/05/2020 Common Stock 2,500 $ 0 8,750 D Employee Stock Option (right to buy) $ 21.35 02/09/2015 M 2,500 ( 12 ) 08/05/2020 Common Stock 2,500 $ 0 6,250 D Employee Stock Option (right to buy) $ 97.65 02/25/2015 A 2,331 ( 13 ) 02/25/2025 Common Stock 2,331 $ 0 2,331 D Employee Stock Option (right to buy) $ 15.82 11/11/2015 M 637 ( 11 ) 02/26/2020 Common Stock 637 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Burgomaster Thomas J 50 OLD WEBSTER ROAD OXFORD, MA01540 Chief Accounting Officer Signatures /s/ Angelo P. Lopresti, Attorney-in-fact 10/31/2018 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Grant of restricted stock units vesting March 1, 2018. ( 2 )Includes 164 shares acquired under the IPG employee stock purchase plan on June 30, 2014. ( 3 )Includes 181 shares acquired under the IPG employee stock purchase plan on December 31, 2014. ( 4 )The reported transaction involves purchase transactions from $72.89 to $72.96 per share. The weighted average price per share was $72.92. 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 purchased at each separate price. ( 5 )The reported transaction involves purchase transactions from $70.27 to $75.13 per share. The weighted average price per share was $71.43. 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 purchased at each separate price. ( 6 )Grant of restricted stock units vesting March 1, 2019. ( 7 )Includes 168 shares acquired under the IPG employee stock purchase plan in June 30, 2015. ( 8 )Includes 147 shares acquired under the IPG employee stock purchase plan on December 31, 2015. ( 9 )Options vesting March 1, 2018. ( 10 )Options vest 25% May 7, 2010, 25% May 2, 2011 and 50% May 7, 2012. ( 11 )Options vest eight equal quarterly installments commencing March 31, 2013. ( 12 )Options vest 25% on August 5, 2011 and the remaining amount in fourteen equal monthly amounts commencing September 30, 2011. ( 13 )Options vest March 1, 2019.

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