CORRECTED - CORRECTED-BRIEF-American Capital to offer 2.5 mln AGNC shares

(In July 14 item, corrects headline to 2.5 mln shares from $2.5 mln)

July 14 (Reuters) - American Capital Agency Corp (AGNC.O): * AGNC announces secondary offering of its common stock by American Capital * Says American Capital Ltd (ACAS.O) agreed to sell 2,500,000 shares of AGNC common stock * Says will not receive any of the proceeds from the sale * Says sale to Deutsche Bank securities