DOSSIER · 13F Holders · Q2 2026

1STDIBS COM INC

3 institutions still hold 1STDIBS COM INC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 320551954·3 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$83K
visible holders
Holders
3
filers reporting
Concentration
98.55%
GROUP ONE TRADING LLC #1
top holder share
AI Holders Summary · Q2 2026

3 institutions reported 1STDIBS COM INC in Q2 2026. GROUP ONE TRADING LLC leads at 98.6% 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
$82K17K0.00%Q2 2026
02
SIMPLEX TRADING, LLC
CIK 0001488542
$1K3000.00%Q3 2026
03
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025