Shares of Thermo Fisher Scientific jumped Thursday after the life sciences giant reported stronger-than-expected second-quarter results and raised its full-year financial guidance, reversing a multiday slide that had followed disappointing results from industry peer Danaher earlier in the week.

Thermo Fisher shares closed Thursday at $572.32, up $45.86, or 8.71%, on the day. The rally began well before the opening bell, with shares adding roughly 5% in premarket trading after the company released its results.

A strong quarter across the board

Thermo Fisher reported second-quarter revenue of approximately $12.0 billion, roughly 10% higher than the same period a year earlier and about $300 million ahead of Wall Street's consensus expectations. Adjusted earnings per share came in at $6.03, surpassing analyst forecasts by roughly $0.30. Bloomberg reported that the results were driven by stronger-than-expected spending from biotech and pharmaceutical customers, along with a broader rebound in demand for laboratory instruments.

The clearest signal of that demand recovery came from Thermo Fisher's Analytical Instruments segment, which posted its fastest growth rate in two years. Segment revenue rose 6.9% to $1.8 billion, according to Bloomberg, a notable turnaround after the segment had remained flat in the first quarter. According to earnings call commentary reported by Yahoo Finance, all three businesses within that segment posted growth, led by electron microscopy, with adjusted........

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