DOSSIER · 13F Holders · Q3 2026

ATYR PHARMA INC

3 institutions still hold ATYR PHARMA INC as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 002120952·3 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$969
visible holders
Holders
3
filers reporting
Concentration
90.71%
GROUP ONE TRADING LLC #1
top holder share
AI Holders Summary · Q3 2026

3 institutions reported ATYR PHARMA INC in Q3 2026. GROUP ONE TRADING LLC leads at 90.7% 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
$8793K0.00%Q3 2026
02
SIMPLEX TRADING, LLC
CIK 0001488542
$903000.00%Q3 2026
03
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025