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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
1130421	P Valentin Gapontsev	C/O Ipg Photonics Corporation 50 Old Webster Road Oxford MA 01540	Ceo & Chairman Of The Board	Yes	Yes	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2010-10-29	79,100	$22.40	7,684,002	No	4	S	Indirect	Through IP Fibre Devices (UK) Ltd.
Common Stock	Disposition	2010-11-01	80,000	$24.36	7,604,002	No	4	S	Indirect	Through IP Fibre Devices (UK) Ltd.

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	Through IP Fibre Devices (UK) Ltd.
No	4	S	Indirect	Through IP Fibre Devices (UK) Ltd.

Footnotes

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 13, 2010.
The reported transaction involved sales transactions from $22.20 to $22.55 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 $23.56 to $24.84 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 reporting person is the managing director of IP Fibre Devices (UK) Ltd. and has voting and investment power with respect to the shares held of record by IP Fibre Devices (UK) Ltd. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of the beneficial ownership of all the reported shares for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.