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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1111928	Ipg Photonics Corp	IPGP	Semiconductors & Related Devices (3674)	043444218

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1378544	A Eugene Shcherbakov	C/O Ipg Photonics Corporation 50 Old Webster Road Oxford MA 01540	Managing Director Of Ipg Laser	Yes	Yes	Yes	No
1508148	Nikolai Platonov	C/O Ipg Photonics Corporation 50 Old Webster Road Oxford MA 01540		No	No	Yes	No
1508155	I Trust Gapontsev Valentin	C/O Ipg Photonics Corporation 50 Old Webster Road Oxford MA 01540		No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Disposition	2011-12-02	2,261	$41.44	7,997,739	No	4	S	Direct
Common Stock	Disposition	2011-12-05	28,859	$41.29	7,968,880	No	4	S	Direct
Common Stock	Disposition	2011-12-06	38,880	$39.95	7,930,000	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct

Footnotes

The reported transaction involved sales transactions from $41.25 to $41.74 per share. 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.
The reported transaction involved sales transactions from $40.68 to $41.72 per share. 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.
These shares are owned directly by the Valentin Gapontsev Trust I (Gapontsev Trust I), and indirectly by (i) Nikolai Platonov, a trustee of Gapontsev Trust I, and (iv) Eugene Scherbakov, a trustee of Gapontsev Trust I. On May 20, 2011, Eugene Scherbakov was appointed as a trustee of the Gapontsev Trust I. Drs. Platonov and Scherbakov each disclaim ownership of the securities directly owned by Gapontsev Trust I except to the extent of his pecuniary interest therein, and the inclusion of thee shares in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 of the Securities Exchange Act of 1034, as amended, or for any other purpose.