DOSSIER · 13F Holders · Q2 2026

LARIMAR THERAPEUTICS INC

4 institutions still hold LARIMAR THERAPEUTICS INC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 517125900·4 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$520K
visible holders
Holders
4
filers reporting
Concentration
39.68%
GROUP ONE TRADING LLC #1
top holder share
AI Holders Summary · Q2 2026

4 institutions reported LARIMAR THERAPEUTICS INC in Q2 2026. GROUP ONE TRADING LLC leads at 39.7% 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
$206K68K0.00%Q2 2026
02
SIMPLEX TRADING, LLC
CIK 0001488542
$168K55K0.00%Q2 2026
03
Blue Owl Capital Holdings LP
CIK 0001858703
$146K729K0.02%Q2 2026
04
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025