The total amount wagered online on sports matches in New Jersey rose to US$298.3mln in March.
That figure is up from US$259.0mln in February, although it is below the US$305.0mln racked up in January when the NFL playoffs were taking place.
Last month’s figures were boosted by March Madness – a huge college basketball tournament that sees many Americans fill out a ‘bracket’ as they attempt to predict the outcome.
After payouts, revenue came in at US$24.3mln last month, up significantly from February's US$12.8mln and January's US$15.5mln.
Internet gaming win was US$39.1mln in March compared to US$25.6mln in the prior year period, reflecting a year-over-year increase of 52.7%.
GAN shares rose 0.5% to 51.8p at the opening bell on Monday.