Rubicon Technology, Inc. (NASDAQ: RBCN) stock fell 0.4% to $4.90 after the company, on Feb. 20, reported a fourth-quarter loss of $1.13 million or $0.05 per share, compared to earnings of $0.8 million or $0.04 per share in the same quarter last year. Analysts expected loss of $0.04 per share for the quarter. Meanwhile, revenue for the quarter was $20.09 million, compared to $19.36 million last year. Analysts estimated revenues of $20.09 million. Share volume was 84,000, compared to an all-day average of 338,000