Ācārya Umasvāmī, also known as Umāsvāti, is venerated by both Digambar and Shwetambar traditions.

In common Jain scholarly understanding, he is often associated with the Digambar tradition, but Shwetambar tradition also accepts and respects him as the author of the Tattvārtha Sūtra.

So the safest answer is:

He is honored by both sects, though he is frequently identified with the Digambar tradition.