NHS Test and Trace generated £350 million of revenues for Serco, with the company providing more than 25% of testing sites and half the Tier 3 tracing capacity.
Overall revenues rose 20% last year to £3.9 billion, leading to operating profits 75% higher at £179.2 million.
The company also lifted its profits guidance for 2021 by 6% today but said it expects revenues and profits to grow at a slower rate than in previous years.