13F Insight
DOSSIER · 13F Holders · Q1 2026High-convictionMulti-bagger

AAR CORP

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

CUSIP 000361905·4 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 1.3%
vs prior quarter
13F value held
$1M
68.0% inst. owned
of float
Holders
4
+84 QoQ
filers reporting
Activity
+63 / −53
+958 added · −905 reduced
this quarter
Concentration
87.61%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q1 2026

4 institutions reported AAR CORP in Q1 2026. IMC-Chicago, LLC leads at 87.6% of the visible book. +84 net new institutions vs prior quarter — accumulation reading.

Top holders

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

#HolderValueShares% port.Quarter
01
IMC-Chicago, LLC
CIK 0001452861· Market maker
$1M10K0.00%Q1 202602
GROUP ONE TRADING LLC
CIK 0000932540
$109,4601K0.00%Q1 202603
SIMPLEX TRADING, LLC
CIK 0001488542
$43,7844000.00%Q1 202604
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025