DOSSIER · 13F Holders · Q1 2026

PROTAGONIST THERAPEUTICS INC

2 institutions still hold PROTAGONIST THERAPEUTICS INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 74366E952·2 13F holders·last filed Mar 31, 2026
Market cap
13F value held
$4M
visible holders
Holders
2
filers reporting
Concentration
100.00%
GROUP ONE TRADING LLC #1
top holder share
AI Holders Summary · Q1 2026

2 institutions reported PROTAGONIST THERAPEUTICS INC in Q1 2026. GROUP ONE TRADING LLC leads at 100.0% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
GROUP ONE TRADING LLC
CIK 0000932540
$4M38K0.01%Q1 2026
02
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025