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\documentclass{article}
\usepackage{newtxtext,newtxmath}
\begin{document}
\circledR \(\circledR\)
\end{document}
The newtx author has been e-mailed on 2019-07-11, but has not reacted as of 2019-07-17. If anyone has an e-mail address of him different from the one mentioned at CTAN (http://web.archive.org/web/201706142254 ... onts/newtx), please feel free to nag him.
Crosspost: http://tex.stackexchange.com/questions/ ... p-in-newtx