X0303 4 2011-03-03 0001274494 FIRST SOLAR, INC. FSLR 0001381112 Ahearn Michael J C/O FIRST SOLAR, INC 350 WEST WASHINGTON STREET SUITE 600 TEMPE AZ 85281-1244 1 Common Stock 2011-03-03 4 S 0 16800 146.33 D 1457039 I By Michael J. Ahearn 2006 GRAT Common Stock 2011-03-03 4 S 0 16820 149.67 D 1440219 I By Michael J. Ahearn 2006 GRAT Common Stock 2011-03-03 4 S 0 6380 150.44 D 1433839 I By Michael J. Ahearn 2006 GRAT Common Stock 2011-03-04 4 S 0 17000 146.51 D 1416839 I By Michael J. Ahearn 2006 GRAT Common Stock 2011-03-04 4 S 0 41949 147.47 D 1374890 I By Michael J. Ahearn 2006 GRAT Common Stock 2011-03-04 4 S 0 1051 148.05 D 1373839 I By Michael J. Ahearn 2006 GRAT Common Stock 14866 D This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person in November 2010, relating to the sale of up to 800,000 shares of the Issuer's Common Stock. This transaction was executed in multiple trades at prices ranging from $146.24 to $146.49. 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 $149.02 to $150.01. 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 $150.04 to $150.50. The price reported above reflects the weighted average sale price for the transactions reported on this line. A total of 40,000 shares were sold on this date in multiple transactions at prices ranging from $146.24 to $150.50, with a total weighted average price of $148.39. 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 $146.00 to $146.95. 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 $147.00 to $147.95. 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 $148.00 to $148.15. The price reported above reflects the weighted average sale price for the transactions reported on this line. A total of 60,000 shares were sold on this date in multiple transactions at prices ranging from $146.00 to $148.15, with a total weighted average price of $147.21. 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/ Peter C. Bartolino, Attorney-in-fact 2011-03-07