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What's happening?
Shares of Vistaprint (CMPR -2.45%) are 14% higher today after the marketing specialist after the bell on Wednesday reported standout earnings for its 2015 fiscal first quarter, and provided strong guidance for the current quarter.

Why it's happening
Vistaprint's first-quarter revenue spiked by 21%, year over year, to $333.9 million, which resulted in adjusted earnings rising 87% to $0.86 per share. Generally accepted accounting principles EPS was $0.71, up significantly from the year-ago quarter's $0.01 result. Vistaprint's top line only narrowly surpassed Wall Street's expectation for $331.1 million in quarterly revenue, but its EPS result obliterated analysts' forecast of just $0.57. CEO Robert Keane highlighted the company's "ability to execute operationally" as the key to its improvements, which pushed its operating margin up to 5.1% from just 3.1% a year ago.

Looking ahead, Vistaprint expects to generate $1.43 billion to $1.5 billion in revenue in fiscal 2015, with full-year adjusted EPS in a range from $3.46 to $3.96 (GAAP EPS should come in between $2.24 and $2.74). Analysts had expected $1.49 billion on the top line and $3.68 in EPS, so the midpoint of Vistaprint's guidance falls below the former estimate but above the latter. On a GAAP basis, Vistaprint's forward P/E should be roughly 25 by the end of its fiscal year, even after accounting for today's 14% pop.