Movies
The film, directed by Oren Peli on a budget of $15,000 (£9,059), beat Saw VI to top the US box office last weekend and grossed $62.4m (£37.9m) in its fifth week on release.
It has now made $65.1m (£39.5m) and has reaped a 433,900% return on its initial investment for Paramount Studios, The Wrap reports.
In comparison, 1999's The Blair Witch Project was made for $60,000 (£36,484) and recouped 414,233% for Artisan Entertainment.
Paramount has spent less than $10m (£6m) on its promotion and the horror film has expanded its initial opening at 12 cinemas to a total of 1,945 for this coming weekend.
"Everybody else thought we should be going faster than we were," said the studio's executive VP of distribution Don Harris. "But I thought we were doing a pretty good job of seeding the ground as we went."
Paramount recently announced that it is considering making a sequel to the surprise hit movie.
Paranormal Activity will open in the UK on November 25.
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