QuinStreet Inc. has completed the acquisition of AmOne Corp., according to an SEC filing.

QuinStreet entered into a share purchase agreement on Oct. 1 with AmOne CEO Rod Romero, who holds 7,500 shares of the company, which represent all of AmOne's issued and outstanding capital stock.

QuinStreet paid about $20.3 million in cash upon closing, subject to certain closing adjustments and up to $8.0 million in additional post-closing payments, payable in equal semiannual installments over a two-year period, with the first installment payable six months after the closing date.