DOSSIER · 13F Holders · Q2 2026

BERKSHIRE HATHAWAY INC DEL

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

CUSIP 084670902·8 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$840M
visible holders
Holders
8
filers reporting
Concentration
57.96%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q2 2026

8 institutions reported BERKSHIRE HATHAWAY INC DEL in Q2 2026. IMC-Chicago, LLC leads at 58.0% 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
$487M973K0.12%Q2 2026
02
GROUP ONE TRADING LLC
CIK 0000932540
$188M375K0.26%Q2 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$136M271K0.08%Q2 2026
04
Maven Securities LTD
CIK 0001633046
$19M37K0.37%Q2 2026
05
JPMORGAN CHASE & CO
CIK 0000019617
$10M21K0.00%Q2 2026
06
Mosaic Advisors LLC
CIK 0001808523
$397K2K0.53%Q2 2026
07
SG Americas Securities, LLC
CIK 0001313360
$362K24K0.00%Q1 2026
08
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025