DOSSIER · 13F Holders · Q3 2026

PROQR THRAPEUTICS N V

4 institutions still hold PROQR THRAPEUTICS N V as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP N71542909·4 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$487K
visible holders
Holders
4
filers reporting
Concentration
86.84%
GROUP ONE TRADING LLC #1
top holder share
AI Holders Summary · Q3 2026

4 institutions reported PROQR THRAPEUTICS N V in Q3 2026. GROUP ONE TRADING LLC leads at 86.8% 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
$423K255K0.00%Q3 2026
02
SIMPLEX TRADING, LLC
CIK 0001488542
$48K29K0.00%Q3 2026
03
HRT FINANCIAL LP
CIK 0001475597
$16K10K0.00%Q3 2026
04
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025