DOSSIER · 13F Holders · Q2 2026

ATLASSIAN CORPORATION

8 institutions still hold ATLASSIAN CORPORATION as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 049468901·8 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$87M
visible holders
Holders
8
filers reporting
Concentration
51.90%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q2 2026

8 institutions reported ATLASSIAN CORPORATION in Q2 2026. IMC-Chicago, LLC leads at 51.9% 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
$45M580K0.01%Q2 2026
02
Optiver Holding B.V.
CIK 0001859606· Market maker
$19M240K0.01%Q2 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$7M90K0.00%Q2 2026
04
Maven Securities LTD
CIK 0001633046
$6M82K0.13%Q2 2026
05
JPMORGAN CHASE & CO
CIK 0000019617
$4M50K0.00%Q2 2026
06
GROUP ONE TRADING LLC
CIK 0000932540
$4M48K0.01%Q2 2026
07
HRT FINANCIAL LP
CIK 0001475597
$2M13K0.01%Q4 2025
08
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025