By late morning, shares had added 12.9% to $10.70.
Management said it expected revenue growth between 15% and 20%, assuming total sales in the range of $1.34 billion to $1.4 billion. Analysts surveyed by Thomson Reuters had anticipated fiscal revenue of $1.24 billion.
Revenue growth will be "primarily driven by its thermal management solutions for the advanced electronics markets and the launch of high temperature furnace system products for solar, LED, and consumer electronics," the company said in a statement.
Better-than-expected growth was enough for investors to overlook missed fourth-quarter expectations.
The graphite electrode specialist recorded a net loss of 3 cents a share for the three months to December. Analysts had forecast a profit of 3 cents a share.
Revenue of $309 million was 16.7% lower than a year earlier and missed consensus by $16.2 million.
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TheStreet Ratings team rates GRAFTECH INTERNATIONAL LTD as a Hold with a ratings score of C. The team has this to say about their recommendation:
"We rate GRAFTECH INTERNATIONAL LTD (GTI) a HOLD. The primary factors that have impacted our rating are mixed -- some indicating strength, some showing weaknesses, with little evidence to justify the expectation of either a positive or negative performance for this stock relative to most other stocks. The company's strengths can be seen in multiple areas, such as its largely solid financial position with reasonable debt levels by most measures, good cash flow from operations and increase in stock price during the past year. However, as a counter to these strengths, we also find weaknesses including feeble growth in the company's earnings per share, deteriorating net income and disappointing return on equity."