The Indy NXT series is getting closer to having its field set with the signing of three more drivers in recent weeks taking the top step of the American junior open-wheel ladder to 15 confirmed entries to date.

Defending back-to-back champions HMD Motorsports have locked in seven drivers so far, with the latest hailing from the Netherlands in Niels Koolen and from Ireland with Jonathan Browne.

Koolen is making a big leap from karting to his first season of racing cars in 2023 in various Formula Regional and F4 machinery to NXT in 2024 with HMD.