Dhaka, March 2 -- AstraZeneca sold its stake in rival COVID-19 vaccine maker Moderna for roughly $1 billion over the course of last year as the Anglo-Swedish drugmaker cashed in on the meteoric rise in the US company's shares.

London-listed AstraZeneca recorded $1.38 billion in equity portfolio sales last year, with "a large proportion" of it coming from the Moderna sale, according its latest annual report.

Shares in Moderna, which went public in 2018 at $23 per share, surged more than five times last year after it began working on a COVID-19 vaccine based on a new mRNA technology that won US approval in December.

Its shot relies on synthetic genes to send a message to the body's immune system to build immunity and can be produced at a...