Protagonist Therapeutics, INC (PTGX) SEC Filings — 2021 0 SEC filings for Protagonist Therapeutics, INC (PTGX) in 2021. FilingsNo filings found for PTGX in 2021. ExploreAll PTGX Filings · PTGX 2020 · PTGX 2022 · All 2021 Filings