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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
88941	Semtech Corp	SMTC	Semiconductors & Related Devices (3674)	952119684

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1201574	L John Piotrowski	200 Flynn Road Camarillo CA 93012-8790		Yes	No	No	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	Acquisiton	2010-09-21	12,500	$13.03	12,700	No	4	M	Direct
Common Stock	Acquisiton	2010-09-21	1,750	$10.94	14,450	No	4	M	Direct
Common Stock	Disposition	2010-09-21	5	$19.10	14,445	No	4	S	Direct
Common Stock	Disposition	2010-09-21	519	$19.11	13,926	No	4	S	Direct
Common Stock	Disposition	2010-09-21	1,400	$19.12	12,526	No	4	S	Direct
Common Stock	Disposition	2010-09-21	300	$19.12	12,226	No	4	S	Direct
Common Stock	Disposition	2010-09-21	400	$19.13	11,826	No	4	S	Direct
Common Stock	Disposition	2010-09-21	200	$19.13	11,626	No	4	S	Direct
Common Stock	Disposition	2010-09-21	1,600	$19.13	10,026	No	4	S	Direct
Common Stock	Disposition	2010-09-21	1,200	$19.14	8,826	No	4	S	Direct
Common Stock	Disposition	2010-09-21	200	$19.15	8,626	No	4	S	Direct
Common Stock	Disposition	2010-09-21	700	$19.15	7,926	No	4	S	Direct
Common Stock	Disposition	2010-09-21	2,100	$19.15	5,826	No	4	S	Direct
Common Stock	Disposition	2010-09-21	1,000	$19.15	4,826	No	4	S	Direct
Common Stock	Disposition	2010-09-21	400	$19.16	4,426	No	4	S	Direct
Common Stock	Disposition	2010-09-21	2,300	$19.16	2,126	No	4	S	Direct
Common Stock	Disposition	2010-09-21	215	$19.16	1,911	No	4	S	Direct
Common Stock	Disposition	2010-09-21	400	$19.17	1,511	No	4	S	Direct
Common Stock	Disposition	2010-09-21	1,300	$19.18	211	No	4	S	Direct
Common Stock	Disposition	2010-09-21	211	$19.18	0	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Acquisiton	2010-09-21	12,500	$0.00	12,500	$13.03
Common Stock	Stock Option (Right to Buy)	Acquisiton	2010-09-21	1,750	$0.00	1,750	$10.94

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
18,198		2012-12-05	No	4	M	Direct
0		2013-01-01	No	4	M	Direct

Footnotes

This option vested in 5 approximately equal annual installments beginning on December 5, 2002.
This option vested in 4 equal annual installments beginning on January 1, 2003.