X0202 4 2005-03-29 0001140486 ATHEROS COMMUNICATIONS INC ATHR 0001277620 BARRATT CRAIG H C/O ATHEROS COMMUNICATIONS, INC. 529 ALMANOR AVENUE SUNNYVALE, CA 94085 1 1 0 0 President and CEO Common Stock 2005-03-29 4 M 0 45000 1.72 A 110750 D Common Stock 2005-03-29 4 S 0 100 11.46 D 110650 D Common Stock 2005-03-29 4 S 0 3018 11.44 D 107632 D Common Stock 2005-03-29 4 S 0 70 11.43 D 107562 D Common Stock 2005-03-29 4 S 0 930 11.41 D 106632 D Common Stock 2005-03-29 4 S 0 2100 11.38 D 104532 D Common Stock 2005-03-29 4 S 0 1900 11.36 D 102632 D Common Stock 2005-03-29 4 S 0 2000 11.35 D 100632 D Common Stock 2005-03-29 4 S 0 207 11.28 D 100425 D Common Stock 2005-03-29 4 S 0 2100 11.27 D 98325 D Common Stock 2005-03-29 4 S 0 1693 11.25 D 96632 D Common Stock 2005-03-29 4 S 0 5362 11.24 D 91270 D Common Stock 2005-03-29 4 S 0 3638 11.23 D 87632 D Common Stock 2005-03-29 4 S 0 2000 11.18 D 85632 D Common Stock 2005-03-29 4 S 0 2000 11.00 D 83632 D Common Stock 2005-03-29 4 S 0 3000 10.74 D 80632 D Common Stock 2005-03-29 4 S 0 900 10.61 D 79732 D Common Stock 2005-03-29 4 S 0 1000 10.60 D 78732 D Common Stock 2005-03-29 4 S 0 1982 10.57 D 76750 D Common Stock 2005-03-29 4 S 0 3900 10.52 D 72850 D Common Stock 2005-03-29 4 S 0 200 10.42 D 72650 D Common Stock 2005-03-29 4 S 0 1400 10.41 D 71250 D Common Stock 2005-03-29 4 S 0 3000 10.22 D 68250 D Common Stock 2005-03-29 4 S 0 1500 10.20 D 66750 D Common Stock 2005-03-29 4 S 0 1000 10.19 D 65750 D Common Stock 2250 I See footnote Common Stock 2250 I See footnote Employee Stock Options (right to buy) 1.72 2005-03-29 4 M 0 45000 0 D 2003-04-09 2013-04-09 Common Stock 45000 1141999 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan. 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. All of the options became exercisable on 4/9/2003. The shares underlying the options are subject to the issuer's right of repurchase that lapsed as to 25% of the shares on 2/23/2004, and lapses as to the remaining shares in 36 equal monthly installments beginning on 3/23/2004. Bruce P. Johnson, Attorney-in-fact 2005-03-29