DOSSIER · 13F Holders · Q1 2026

THREDUP INC

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

CUSIP 88556E902·4 13F holders·last filed Mar 31, 2026
Market cap
13F value held
$134K
visible holders
Holders
4
filers reporting
Concentration
95.84%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q1 2026

4 institutions reported THREDUP INC in Q1 2026. IMC-Chicago, LLC leads at 95.8% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
IMC-Chicago, LLC
CIK 0001452861· Market maker
$129K39K0.00%Q1 2026
02
SIMPLEX TRADING, LLC
CIK 0001488542
$5K1K0.00%Q1 2026
03
GROUP ONE TRADING LLC
CIK 0000932540
$9843000.00%Q1 2026
04
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025