X0303 4 2011-03-15 0001274494 FIRST SOLAR, INC. FSLR 0001338099 Estate of John T. Walton P.O. BOX 1860 BENTONVILLE AR 72712 1 Common Stock 2011-03-15 4 S 0 20355 151.19 D 15246150 D Common Stock 2011-03-15 4 S 0 112225 152.44 D 15133925 D Common Stock 2011-03-15 4 S 0 17420 153.09 D 15116505 D Common Stock 2011-03-16 4 S 0 51940 153.76 D 15064565 D Common Stock 2011-03-16 4 S 0 44814 154.55 D 15019751 D Common Stock 2011-03-16 4 S 0 21083 155.48 D 14998668 D Common Stock 2011-03-16 4 S 0 21638 156.97 D 14977030 D Common Stock 2011-03-16 4 S 0 9875 157.80 D 14967155 D Common Stock 2011-03-16 4 S 0 650 158.49 D 14966505 D Common Stock 2011-03-17 4 S 0 17382 153.36 D 14949123 D Common Stock 2011-03-17 4 S 0 51057 154.24 D 14898066 D Common Stock 2011-03-17 4 S 0 14808 155.56 D 14883258 D Common Stock 2011-03-17 4 S 0 12103 156.62 D 14871155 D Common Stock 2011-03-17 4 S 0 15000 157.72 D 14856155 D Common Stock 2011-03-17 4 S 0 250 158.50 D 14855905 D This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person. This transaction was executed in multiple trades at prices ranging from $150.88 to $151.38. The price reported above reflects the weighted average sale price for the transactions reported on this line. This transaction was executed in multiple trades at prices ranging from $151.93 to $152.92. The price reported above reflects the weighted average sale price for the transactions reported on this line. This transaction was executed in multiple trades at prices ranging from $152.93 to $153.48. The price reported above reflects the weighted average sale price for the transactions reported on this line. A total of 150,000 shares were sold on this date in multiple transactions at prices ranging from $150.88 to $153.48, with a total weighted average sale price of $152.34. The reporting person undertakes to provide upon request by the staff of the SEC, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. This transaction was executed in multiple trades at prices ranging from $153.20 to $154.19. The price reported above reflects the weighted average sale price for the transactions reported on this line. This transaction was executed in multiple trades at prices ranging from $154.21 to $155.20. The price reported above reflects the weighted average sale price for the transactions reported on this line. This transaction was executed in multiple trades at prices ranging from $155.22 to $156.20. The price reported above reflects the weighted average sale price for the transactions reported on this line. This transaction was executed in multiple trades at prices ranging from $156.46 to $157.45. The price reported above reflects the weighted average sale price for the transactions reported on this line. This transaction was executed in multiple trades at prices ranging from $157.46 to $158.32. The price reported above reflects the weighted average sale price for the transactions reported on this line. A total of 150,000 shares were sold on this date in multiple transactions at prices ranging from $153.20 to $158.49, with a total weighted average sale price of $154.99. The reporting person undertakes to provide upon request by the staff of the SEC, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. This transaction was executed in multiple trades at prices ranging from $152.88 to $153.87. The price reported above reflects the weighted average sale price for the transactions reported on this line. This transaction was executed in multiple trades at prices ranging from $153.91 to $154.79. The price reported above reflects the weighted average sale price for the transactions reported on this line. This transaction was executed in multiple trades at prices ranging from $155.16 to $156.15. The price reported above reflects the weighted average sale price for the transactions reported on this line. This transaction was executed in multiple trades at prices ranging from $156.20 to $157.12. The price reported above reflects the weighted average sale price for the transactions reported on this line. This transaction was executed in multiple trades at prices ranging from $157.21 to $158.08. The price reported above reflects the weighted average sale price for the transactions reported on this line. A total of 110,600 shares were sold on this date in multiple transactions at prices ranging from $152.88 to $158.50, with a total weighted average sale price of $155.02. The reporting person undertakes to provide upon request by the staff of the SEC, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price. /s/ Richard Mittermaier, Attorney-in-fact 2011-03-17