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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1140486	Atheros Communications Inc	ATHR	Semiconductors & Related Devices (3674)	770485570

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1277620	H Craig Barratt	C/O Atheros Communications, Inc. 5480 Great America Parkway Santa Clara, CA 95054	President And Ceo	Yes	Yes	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	2010-02-11	7,489	$9.34	340,052	No	4	M	Direct
Common Stock	Disposition	2010-02-11	37,489	$34.05	302,563	No	4	S	Direct
Common Stock	Acquisiton	2010-02-12	22,511	$9.34	325,074	No	4	M	Direct
Common Stock	Disposition	2010-02-12	22,511	$34.11	302,563	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Options (right to buy)	Acquisiton	2010-02-11	143,000	$0.00	143,000	$34.02
Common Stock	Employee Stock Options (right to buy)	Disposition	2010-02-11	7,489	$0.00	7,489	$9.34
Common Stock	Employee Stock Options (right to buy)	Disposition	2010-02-12	22,511	$0.00	22,511	$9.34

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
143,000		2017-02-10	No	4	A	Direct
122,511	2004-01-14	2014-01-14	No	4	M	Direct
100,000	2004-01-14	2014-01-14	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	2,250	Indirect	See Footnote
Common Stock	2,250	Indirect	See Footnote

Footnotes

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.
Represents the weighted average sales price for a number of sale transactions effected at prices ranging from $34.05 to $34.24. The Reporting Person has provided to the issuer, and undertakes to provide upon request by the SEC staff, or any security holder of the issuer, information regarding the number of shares sold at each separate price within the range.
These shares are held in trust for the benefit of the reporting person's son. The reporting person's brother-in-law is the trustee of the trust. The reporting person disclaims beneficial ownership of these securities, and the filing of this report is not an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.
The options become exercisable in 48 equal monthly installments commencing on March 11, 2010.
All of the options became exercisable on 1/14/2004. The shares underlying the options are subject to the issuer's right of repurchase that lapsed as to 30,000 of the shares on 1/14/2005, and lapsed as to the remaining shares in 48 equal monthly installments beginning on 2/14/2005.