NPG meaning in Academic & Science ?

Nature Portfolio (formerly known as Nature Publishing Group and Nature Research) is a division of the international scientific publishing company Springer Nature that publishes academic journals, magazines, online databases, and services in science and medicine. Nature Research's flagship publication is Nature, a weekly multidisciplinary journal first published in 1869. It also publishes the Nature-titled research journals, Nature Reviews journals (since 2000), society-owned academic journals, and a range of open access journals, including Scientific Reports and Nature Communications. Springer Nature also publishes Scientific American in 16 languages, a magazine intended for the general public. In 2013, prior to the merger with Springer and the creation of Springer Nature, Nature Publishing Group's owner, Holtzbrinck Publishing Group, bought a controlling stake in Frontiers.

Before Springer Nature was formed in 2015, Nature Research (as the Nature Publishing Group) was a part of Macmillan Science and Education, a fully owned subsidiary of Holtzbrinck Publishing Group.