* JB Oxford Holdings Inc. of Los Angeles reported a second-quarter profit as revenue surged at the discount and Internet brokerage. JB Oxford earned $4.3 million, or 18 cents a share, contrasted with a loss of $2.8 million, or 20 cents, for the period a year earlier. Revenue rose 63% to a record $26.9 million. The firm has had three straight profitable quarters since losing money for the four previous quarters. For this year's first quarter, JB Oxford earned $3.7 million, or 13 cents a share, on revenue of $23 million. JB Oxford shares were unchanged at $8.81 on the Nasdaq Small-Cap Market.