Burlington Stores Inc. shares rose 2.9% in premarket trade Thursday, after the company posted stronger-than-expected earnings for its fiscal first quarter through May 6. The discount clothing retailer said it had net income of $83 million, or $1.20 a share, in the quarter, up from $52.4 million, or 73 cents a share, in the year-earlier period. Adjusted per-share earnings came to $1.26, well ahead of the FactSet consensus of $1.09. Sales rose 12.8% to $1.518 billion, also ahead of the FactSet consensus of $1.492 billion. Chief Executive Tom Kingsbury said the numbers were well ahead of the company's own guidance and raised its outlook for the rest of the year. The company is now expecting full-year sales to grow 9.7% to 10.5%. Adjusted EPS is expected to range from $5.90 to $6.00, up from prior guidance of $5.73 to $5.83. Shares have gained about 40% in the last 12 months, while the S&P 500 has gained 13%.