DOSSIER · 13F Holders · Q1 2026

THREDUP INC

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

CUSIP 88556E952·3 13F holders·last filed Mar 31, 2026
Market cap
13F value held
$7K
visible holders
Holders
3
filers reporting
Concentration
95.24%
SIMPLEX TRADING, LLC #1
top holder share
AI Holders Summary · Q1 2026

3 institutions reported THREDUP INC in Q1 2026. SIMPLEX TRADING, LLC leads at 95.2% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
SIMPLEX TRADING, LLC
CIK 0001488542
$7K2K0.00%Q1 2026
02
GROUP ONE TRADING LLC
CIK 0000932540
$3281000.00%Q1 2026
03
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025