DOSSIER · 13F Holders · Q3 2026

SPINNAKER ETF SERIES

4 institutions still hold SPINNAKER ETF SERIES as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 84858T902·4 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$603K
visible holders
Holders
4
filers reporting
Concentration
56.25%
GROUP ONE TRADING LLC #1
top holder share
AI Holders Summary · Q3 2026

4 institutions reported SPINNAKER ETF SERIES in Q3 2026. GROUP ONE TRADING LLC leads at 56.3% 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
$339K8K0.00%Q3 2026
02
IMC-Chicago, LLC
CIK 0001452861· Market maker
$251K6K0.00%Q3 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$13K3000.00%Q3 2026
04
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025